avformat/imf: Demuxer

Signed-off-by: Pierre-Anthony Lemieux <pal@palemieux.com>
Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>

8 files changed, 1958 insertions, 2 deletions

diff --git a/configure b/configure
index 23ef2abc9b..07fb7925d8 100755
--- a/configure
+++ b/configure
@@ -298,7 +298,7 @@ External library support:
   --enable-libxvid         enable Xvid encoding via xvidcore,
                            native MPEG-4/Xvid encoder exists [no]
   --enable-libxml2         enable XML parsing using the C library libxml2, needed
-                           for dash demuxing support [no]
+                           for dash and imf demuxing support [no]
   --enable-libzimg         enable z.lib, needed for zscale filter [no]
   --enable-libzmq          enable message passing via libzmq [no]
   --enable-libzvbi         enable teletext support via libzvbi [no]
@@ -3415,6 +3415,7 @@ hls_muxer_select="mpegts_muxer"
 hls_muxer_suggest="gcrypt openssl"
 image2_alias_pix_demuxer_select="image2_demuxer"
 image2_brender_pix_demuxer_select="image2_demuxer"
+imf_demuxer_deps="libxml2"
 ipod_muxer_select="mov_muxer"
 ismv_muxer_select="mov_muxer"
 ivf_muxer_select="av1_metadata_bsf vp9_superframe_bsf"
diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index 593ff34c86..b474a24278 100644
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -274,6 +274,12 @@ which streams to actually receive.
 Each stream mirrors the @code{id} and @code{bandwidth} properties from the
 @code{<Representation>} as metadata keys named "id" and "variant_bitrate" respectively.
 
+@section imf
+
+Interoperable Master Format demuxer.
+
+This demuxer presents audio and video streams found in an IMF Composition.
+
 @section flv, live_flv, kux
 
 Adobe Flash Video Format demuxer.
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 65fb789aa3..74b1c56351 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -286,6 +286,7 @@ OBJS-$(CONFIG_IMAGE_WEBP_PIPE_DEMUXER)    += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_XBM_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_XPM_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_XWD_PIPE_DEMUXER)     += img2dec.o img2.o
+OBJS-$(CONFIG_IMF_DEMUXER)               += imfdec.o imf_cpl.o
 OBJS-$(CONFIG_INGENIENT_DEMUXER)         += ingenientdec.o rawdec.o
 OBJS-$(CONFIG_IPMOVIE_DEMUXER)           += ipmovie.o
 OBJS-$(CONFIG_IPU_DEMUXER)               += ipudec.o rawdec.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index a100639773..d066a7745b 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -213,6 +213,7 @@ extern const AVInputFormat  ff_image2pipe_demuxer;
 extern const AVOutputFormat ff_image2pipe_muxer;
 extern const AVInputFormat  ff_image2_alias_pix_demuxer;
 extern const AVInputFormat  ff_image2_brender_pix_demuxer;
+extern const AVInputFormat  ff_imf_demuxer;
 extern const AVInputFormat  ff_ingenient_demuxer;
 extern const AVInputFormat  ff_ipmovie_demuxer;
 extern const AVOutputFormat ff_ipod_muxer;
diff --git a/libavformat/imf.h b/libavformat/imf.h
new file mode 100644
index 0000000000..62c4468ce9
--- /dev/null
+++ b/libavformat/imf.h
@@ -0,0 +1,207 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ *
+ * Copyright (c) Sandflow Consulting LLC
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * Public header file for the processing of Interoperable Master Format (IMF)
+ * packages.
+ *
+ * @author Pierre-Anthony Lemieux
+ * @author Valentin Noel
+ * @file
+ * @ingroup lavu_imf
+ */
+
+#ifndef AVFORMAT_IMF_H
+#define AVFORMAT_IMF_H
+
+#include "avformat.h"
+#include "libavformat/avio.h"
+#include "libavutil/rational.h"
+#include <libxml/tree.h>
+
+#define FF_IMF_UUID_FORMAT                            \
+    "urn:uuid:%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-" \
+    "%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
+
+/**
+ * UUID as defined in IETF RFC 422
+ */
+typedef uint8_t FFIMFUUID[16];
+
+/**
+ * IMF Composition Playlist Base Resource
+ */
+typedef struct FFIMFBaseResource {
+    AVRational edit_rate;  /**< BaseResourceType/EditRate */
+    uint32_t entry_point;  /**< BaseResourceType/EntryPoint */
+    uint32_t duration;     /**< BaseResourceType/Duration */
+    uint32_t repeat_count; /**< BaseResourceType/RepeatCount */
+} FFIMFBaseResource;
+
+/**
+ * IMF Composition Playlist Track File Resource
+ */
+typedef struct FFIMFTrackFileResource {
+    FFIMFBaseResource base;
+    FFIMFUUID track_file_uuid; /**< TrackFileResourceType/TrackFileId */
+} FFIMFTrackFileResource;
+
+/**
+ * IMF Marker
+ */
+typedef struct FFIMFMarker {
+    xmlChar *label_utf8; /**< Marker/Label */
+    xmlChar *scope_utf8; /**< Marker/Label/\@scope */
+    uint32_t offset;     /**< Marker/Offset */
+} FFIMFMarker;
+
+/**
+ * IMF Composition Playlist Marker Resource
+ */
+typedef struct FFIMFMarkerResource {
+    FFIMFBaseResource base;
+    uint32_t marker_count; /**< Number of Marker elements */
+    FFIMFMarker *markers;  /**< Marker elements */
+} FFIMFMarkerResource;
+
+/**
+ * IMF Composition Playlist Virtual Track
+ */
+typedef struct FFIMFBaseVirtualTrack {
+    FFIMFUUID id_uuid; /**< TrackId associated with the Virtual Track */
+} FFIMFBaseVirtualTrack;
+
+/**
+ * IMF Composition Playlist Virtual Track that consists of Track File Resources
+ */
+typedef struct FFIMFTrackFileVirtualTrack {
+    FFIMFBaseVirtualTrack base;
+    uint32_t resource_count;           /**< Number of Resource elements present in the Virtual Track */
+    FFIMFTrackFileResource *resources; /**< Resource elements of the Virtual Track */
+    unsigned int resources_alloc_sz;   /**< Size of the resources buffer */
+} FFIMFTrackFileVirtualTrack;
+
+/**
+ * IMF Composition Playlist Virtual Track that consists of Marker Resources
+ */
+typedef struct FFIMFMarkerVirtualTrack {
+    FFIMFBaseVirtualTrack base;
+    uint32_t resource_count;        /**< Number of Resource elements present in the Virtual Track */
+    FFIMFMarkerResource *resources; /**< Resource elements of the Virtual Track */
+} FFIMFMarkerVirtualTrack;
+
+/**
+ * IMF Composition Playlist
+ */
+typedef struct FFIMFCPL {
+    FFIMFUUID id_uuid;                               /**< CompositionPlaylist/Id element */
+    xmlChar *content_title_utf8;                     /**< CompositionPlaylist/ContentTitle element */
+    AVRational edit_rate;                            /**< CompositionPlaylist/EditRate element */
+    FFIMFMarkerVirtualTrack *main_markers_track;     /**< Main Marker Virtual Track */
+    FFIMFTrackFileVirtualTrack *main_image_2d_track; /**< Main Image Virtual Track */
+    uint32_t main_audio_track_count;                 /**< Number of Main Audio Virtual Tracks */
+    FFIMFTrackFileVirtualTrack *main_audio_tracks;   /**< Main Audio Virtual Tracks */
+} FFIMFCPL;
+
+/**
+ * Parse an IMF CompositionPlaylist element into the FFIMFCPL data structure.
+ * @param[in] doc An XML document from which the CPL is read.
+ * @param[out] cpl Pointer to a memory area (allocated by the client), where the
+ *  function writes a pointer to the newly constructed FFIMFCPL structure (or
+ *  NULL if the CPL could not be parsed). The client is responsible for freeing
+ *  the FFIMFCPL structure using ff_imf_cpl_free().
+ * @return A non-zero value in case of an error.
+ */
+int ff_imf_parse_cpl_from_xml_dom(xmlDocPtr doc, FFIMFCPL **cpl);
+
+/**
+ * Parse an IMF Composition Playlist document into the FFIMFCPL data structure.
+ * @param[in] in The context from which the CPL is read.
+ * @param[out] cpl Pointer to a memory area (allocated by the client), where the
+ * function writes a pointer to the newly constructed FFIMFCPL structure (or
+ * NULL if the CPL could not be parsed). The client is responsible for freeing
+ * the FFIMFCPL structure using ff_imf_cpl_free().
+ * @return A non-zero value in case of an error.
+ */
+int ff_imf_parse_cpl(AVIOContext *in, FFIMFCPL **cpl);
+
+/**
+ * Allocates and initializes an FFIMFCPL data structure.
+ * @return A pointer to the newly constructed FFIMFCPL structure (or NULL if the
+ * structure could not be constructed). The client is responsible for freeing
+ * the FFIMFCPL structure using ff_imf_cpl_free().
+ */
+FFIMFCPL *ff_imf_cpl_alloc(void);
+
+/**
+ * Deletes an FFIMFCPL data structure previously instantiated with ff_imf_cpl_alloc().
+ * @param[in] cpl The FFIMFCPL structure to delete.
+ */
+void ff_imf_cpl_free(FFIMFCPL *cpl);
+
+/**
+ * Reads an unsigned 32-bit integer from an XML element
+ * @return 0 on success, < 0 AVERROR code on error.
+ */
+int ff_imf_xml_read_uint32(xmlNodePtr element, uint32_t *number);
+
+/**
+ * Reads an AVRational from an XML element
+ * @return 0 on success, < 0 AVERROR code on error.
+ */
+int ff_imf_xml_read_rational(xmlNodePtr element, AVRational *rational);
+
+/**
+ * Reads a UUID from an XML element
+ * @return 0 on success, < 0 AVERROR code on error.
+ */
+int ff_imf_xml_read_uuid(xmlNodePtr element, uint8_t uuid[16]);
+
+/**
+ * Returns the first child element with the specified local name
+ * @return A pointer to the child element, or NULL if no such child element exists.
+ */
+xmlNodePtr ff_imf_xml_get_child_element_by_name(xmlNodePtr parent, const char *name_utf8);
+
+#endif
diff --git a/libavformat/imf_cpl.c b/libavformat/imf_cpl.c
new file mode 100644
index 0000000000..7055b49ae8
--- /dev/null
+++ b/libavformat/imf_cpl.c
@@ -0,0 +1,841 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ *
+ * Copyright (c) Sandflow Consulting LLC
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * Implements IMP CPL processing
+ *
+ * @author Pierre-Anthony Lemieux
+ * @file
+ * @ingroup lavu_imf
+ */
+
+#include "imf.h"
+#include "libavformat/mxf.h"
+#include "libavutil/bprint.h"
+#include "libavutil/error.h"
+#include <libxml/parser.h>
+
+xmlNodePtr ff_imf_xml_get_child_element_by_name(xmlNodePtr parent, const char *name_utf8)
+{
+    xmlNodePtr cur_element;
+
+    cur_element = xmlFirstElementChild(parent);
+    while (cur_element) {
+        if (xmlStrcmp(cur_element->name, name_utf8) == 0)
+            return cur_element;
+
+        cur_element = xmlNextElementSibling(cur_element);
+    }
+    return NULL;
+}
+
+int ff_imf_xml_read_uuid(xmlNodePtr element, uint8_t uuid[16])
+{
+    xmlChar *element_text = NULL;
+    int scanf_ret;
+    int ret = 0;
+
+    element_text = xmlNodeListGetString(element->doc, element->xmlChildrenNode, 1);
+    scanf_ret = sscanf(element_text,
+                       FF_IMF_UUID_FORMAT,
+                       &uuid[0],
+                       &uuid[1],
+                       &uuid[2],
+                       &uuid[3],
+                       &uuid[4],
+                       &uuid[5],
+                       &uuid[6],
+                       &uuid[7],
+                       &uuid[8],
+                       &uuid[9],
+                       &uuid[10],
+                       &uuid[11],
+                       &uuid[12],
+                       &uuid[13],
+                       &uuid[14],
+                       &uuid[15]);
+    if (scanf_ret != 16) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid UUID\n");
+        ret = AVERROR_INVALIDDATA;
+    }
+    xmlFree(element_text);
+
+    return ret;
+}
+
+int ff_imf_xml_read_rational(xmlNodePtr element, AVRational *rational)
+{
+    xmlChar *element_text = NULL;
+    int ret = 0;
+
+    element_text = xmlNodeListGetString(element->doc, element->xmlChildrenNode, 1);
+    if (sscanf(element_text, "%i %i", &rational->num, &rational->den) != 2) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid rational number\n");
+        ret = AVERROR_INVALIDDATA;
+    }
+    xmlFree(element_text);
+
+    return ret;
+}
+
+int ff_imf_xml_read_uint32(xmlNodePtr element, uint32_t *number)
+{
+    xmlChar *element_text = NULL;
+    int ret = 0;
+
+    element_text = xmlNodeListGetString(element->doc, element->xmlChildrenNode, 1);
+    if (sscanf(element_text, "%" PRIu32, number) != 1) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid unsigned 32-bit integer");
+        ret = AVERROR_INVALIDDATA;
+    }
+    xmlFree(element_text);
+
+    return ret;
+}
+
+static void imf_base_virtual_track_init(FFIMFBaseVirtualTrack *track)
+{
+    memset(track->id_uuid, 0, sizeof(track->id_uuid));
+}
+
+static void imf_marker_virtual_track_init(FFIMFMarkerVirtualTrack *track)
+{
+    imf_base_virtual_track_init((FFIMFBaseVirtualTrack *)track);
+    track->resource_count = 0;
+    track->resources = NULL;
+}
+
+static void imf_trackfile_virtual_track_init(FFIMFTrackFileVirtualTrack *track)
+{
+    imf_base_virtual_track_init((FFIMFBaseVirtualTrack *)track);
+    track->resource_count = 0;
+    track->resources_alloc_sz = 0;
+    track->resources = NULL;
+}
+
+static void imf_base_resource_init(FFIMFBaseResource *rsrc)
+{
+    rsrc->duration = 0;
+    rsrc->edit_rate = av_make_q(0, 1);
+    rsrc->entry_point = 0;
+    rsrc->repeat_count = 1;
+}
+
+static void imf_marker_resource_init(FFIMFMarkerResource *rsrc)
+{
+    imf_base_resource_init((FFIMFBaseResource *)rsrc);
+    rsrc->marker_count = 0;
+    rsrc->markers = NULL;
+}
+
+static void imf_marker_init(FFIMFMarker *marker)
+{
+    marker->label_utf8 = NULL;
+    marker->offset = 0;
+    marker->scope_utf8 = NULL;
+}
+
+static void imf_trackfile_resource_init(FFIMFTrackFileResource *rsrc)
+{
+    imf_base_resource_init((FFIMFBaseResource *)rsrc);
+    memset(rsrc->track_file_uuid, 0, sizeof(rsrc->track_file_uuid));
+}
+
+static int fill_content_title(xmlNodePtr cpl_element, FFIMFCPL *cpl)
+{
+    xmlNodePtr element = NULL;
+
+    if (!(element = ff_imf_xml_get_child_element_by_name(cpl_element, "ContentTitle"))) {
+        av_log(NULL, AV_LOG_ERROR, "ContentTitle element not found in the IMF CPL\n");
+        return AVERROR_INVALIDDATA;
+    }
+    cpl->content_title_utf8 = xmlNodeListGetString(cpl_element->doc,
+                                                   element->xmlChildrenNode,
+                                                   1);
+
+    return 0;
+}
+
+static int fill_edit_rate(xmlNodePtr cpl_element, FFIMFCPL *cpl)
+{
+    xmlNodePtr element = NULL;
+
+    if (!(element = ff_imf_xml_get_child_element_by_name(cpl_element, "EditRate"))) {
+        av_log(NULL, AV_LOG_ERROR, "EditRate element not found in the IMF CPL\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    return ff_imf_xml_read_rational(element, &cpl->edit_rate);
+}
+
+static int fill_id(xmlNodePtr cpl_element, FFIMFCPL *cpl)
+{
+    xmlNodePtr element = NULL;
+
+    if (!(element = ff_imf_xml_get_child_element_by_name(cpl_element, "Id"))) {
+        av_log(NULL, AV_LOG_ERROR, "Id element not found in the IMF CPL\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    return ff_imf_xml_read_uuid(element, cpl->id_uuid);
+}
+
+static int fill_marker(xmlNodePtr marker_elem, FFIMFMarker *marker)
+{
+    xmlNodePtr element = NULL;
+    int ret = 0;
+
+    /* read Offset */
+    if (!(element = ff_imf_xml_get_child_element_by_name(marker_elem, "Offset"))) {
+        av_log(NULL, AV_LOG_ERROR, "Offset element not found in a Marker\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if ((ret = ff_imf_xml_read_uint32(element, &marker->offset)))
+        return ret;
+
+    /* read Label and Scope */
+    if (!(element = ff_imf_xml_get_child_element_by_name(marker_elem, "Label"))) {
+        av_log(NULL, AV_LOG_ERROR, "Label element not found in a Marker\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if (!(marker->label_utf8 = xmlNodeListGetString(element->doc, element->xmlChildrenNode, 1))) {
+        av_log(NULL, AV_LOG_ERROR, "Empty Label element found in a Marker\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if (!(marker->scope_utf8 = xmlGetNoNsProp(element, "scope"))) {
+        marker->scope_utf8
+            = xmlCharStrdup("http://www.smpte-ra.org/schemas/2067-3/2013#standard-markers");
+        if (!marker->scope_utf8) {
+            xmlFree(marker->label_utf8);
+            return AVERROR(ENOMEM);
+        }
+    }
+
+    return ret;
+}
+
+static int fill_base_resource(xmlNodePtr resource_elem, FFIMFBaseResource *resource, FFIMFCPL *cpl)
+{
+    xmlNodePtr element = NULL;
+    int ret = 0;
+
+    /* read EditRate */
+    if (!(element = ff_imf_xml_get_child_element_by_name(resource_elem, "EditRate"))) {
+        resource->edit_rate = cpl->edit_rate;
+    } else if ((ret = ff_imf_xml_read_rational(element, &resource->edit_rate))) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid EditRate element found in a Resource\n");
+        return ret;
+    }
+
+    /* read EntryPoint */
+    if ((element = ff_imf_xml_get_child_element_by_name(resource_elem, "EntryPoint"))) {
+        if ((ret = ff_imf_xml_read_uint32(element, &resource->entry_point))) {
+            av_log(NULL, AV_LOG_ERROR, "Invalid EntryPoint element found in a Resource\n");
+            return ret;
+        }
+    } else {
+        resource->entry_point = 0;
+    }
+
+    /* read IntrinsicDuration */
+    if (!(element = ff_imf_xml_get_child_element_by_name(resource_elem, "IntrinsicDuration"))) {
+        av_log(NULL, AV_LOG_ERROR, "IntrinsicDuration element missing from Resource\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if ((ret = ff_imf_xml_read_uint32(element, &resource->duration))) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid IntrinsicDuration element found in a Resource\n");
+        return ret;
+    }
+    resource->duration -= resource->entry_point;
+
+    /* read SourceDuration */
+    if ((element = ff_imf_xml_get_child_element_by_name(resource_elem, "SourceDuration"))) {
+        if ((ret = ff_imf_xml_read_uint32(element, &resource->duration))) {
+            av_log(NULL, AV_LOG_ERROR, "SourceDuration element missing from Resource\n");
+            return ret;
+        }
+    }
+
+    /* read RepeatCount */
+    if ((element = ff_imf_xml_get_child_element_by_name(resource_elem, "RepeatCount")))
+        ret = ff_imf_xml_read_uint32(element, &resource->repeat_count);
+
+    return ret;
+}
+
+static int fill_trackfile_resource(xmlNodePtr tf_resource_elem,
+                                   FFIMFTrackFileResource *tf_resource,
+                                   FFIMFCPL *cpl)
+{
+    xmlNodePtr element = NULL;
+    int ret = 0;
+
+    if ((ret = fill_base_resource(tf_resource_elem, (FFIMFBaseResource *)tf_resource, cpl)))
+        return ret;
+
+    /* read TrackFileId */
+    if ((element = ff_imf_xml_get_child_element_by_name(tf_resource_elem, "TrackFileId"))) {
+        if ((ret = ff_imf_xml_read_uuid(element, tf_resource->track_file_uuid))) {
+            av_log(NULL, AV_LOG_ERROR, "Invalid TrackFileId element found in Resource\n");
+            return ret;
+        }
+    } else {
+        av_log(NULL, AV_LOG_ERROR, "TrackFileId element missing from Resource\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    return ret;
+}
+
+static int fill_marker_resource(xmlNodePtr marker_resource_elem,
+                                FFIMFMarkerResource *marker_resource,
+                                FFIMFCPL *cpl)
+{
+    xmlNodePtr element = NULL;
+    int ret = 0;
+
+    if ((ret = fill_base_resource(marker_resource_elem, (FFIMFBaseResource *)marker_resource, cpl)))
+        return ret;
+
+    /* read markers */
+    element = xmlFirstElementChild(marker_resource_elem);
+    while (element) {
+        if (xmlStrcmp(element->name, "Marker") == 0) {
+            void *tmp;
+
+            if (marker_resource->marker_count == UINT32_MAX)
+                return AVERROR(ENOMEM);
+            tmp = av_realloc_array(marker_resource->markers,
+                                   marker_resource->marker_count + 1,
+                                   sizeof(FFIMFMarker));
+            if (!tmp)
+                return AVERROR(ENOMEM);
+            marker_resource->markers = tmp;
+
+            imf_marker_init(&marker_resource->markers[marker_resource->marker_count]);
+            ret = fill_marker(element,
+                              &marker_resource->markers[marker_resource->marker_count]);
+            marker_resource->marker_count++;
+            if (ret)
+                return ret;
+        }
+
+        element = xmlNextElementSibling(element);
+    }
+
+    return ret;
+}
+
+static int push_marker_sequence(xmlNodePtr marker_sequence_elem, FFIMFCPL *cpl)
+{
+    int ret = 0;
+    uint8_t uuid[16];
+    xmlNodePtr resource_list_elem = NULL;
+    xmlNodePtr resource_elem = NULL;
+    xmlNodePtr track_id_elem = NULL;
+    unsigned long resource_elem_count;
+    void *tmp;
+
+    /* read TrackID element */
+    if (!(track_id_elem = ff_imf_xml_get_child_element_by_name(marker_sequence_elem, "TrackId"))) {
+        av_log(NULL, AV_LOG_ERROR, "TrackId element missing from Sequence\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if (ff_imf_xml_read_uuid(track_id_elem, uuid)) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid TrackId element found in Sequence\n");
+        return AVERROR_INVALIDDATA;
+    }
+    av_log(NULL,
+           AV_LOG_DEBUG,
+           "Processing IMF CPL Marker Sequence for Virtual Track " FF_IMF_UUID_FORMAT "\n",
+           UID_ARG(uuid));
+
+    /* create main marker virtual track if it does not exist */
+    if (!cpl->main_markers_track) {
+        cpl->main_markers_track = av_malloc(sizeof(FFIMFMarkerVirtualTrack));
+        if (!cpl->main_markers_track)
+            return AVERROR(ENOMEM);
+        imf_marker_virtual_track_init(cpl->main_markers_track);
+        memcpy(cpl->main_markers_track->base.id_uuid, uuid, sizeof(uuid));
+
+    } else if (memcmp(cpl->main_markers_track->base.id_uuid, uuid, sizeof(uuid)) != 0) {
+        av_log(NULL, AV_LOG_ERROR, "Multiple marker virtual tracks were found\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* process resources */
+    resource_list_elem = ff_imf_xml_get_child_element_by_name(marker_sequence_elem, "ResourceList");
+    if (!resource_list_elem)
+        return 0;
+
+    resource_elem_count = xmlChildElementCount(resource_list_elem);
+    if (resource_elem_count > UINT32_MAX
+        || cpl->main_markers_track->resource_count > UINT32_MAX - resource_elem_count)
+        return AVERROR(ENOMEM);
+    tmp = av_realloc_array(cpl->main_markers_track->resources,
+                           cpl->main_markers_track->resource_count + resource_elem_count,
+                           sizeof(FFIMFMarkerResource));
+    if (!tmp) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot allocate Marker Resources\n");
+        return AVERROR(ENOMEM);
+    }
+    cpl->main_markers_track->resources = tmp;
+
+    resource_elem = xmlFirstElementChild(resource_list_elem);
+    while (resource_elem) {
+        imf_marker_resource_init(&cpl->main_markers_track->resources[cpl->main_markers_track->resource_count]);
+        ret = fill_marker_resource(resource_elem,
+                                   &cpl->main_markers_track->resources[cpl->main_markers_track->resource_count],
+                                   cpl);
+        cpl->main_markers_track->resource_count++;
+        if (ret)
+            return ret;
+
+        resource_elem = xmlNextElementSibling(resource_elem);
+    }
+
+    return ret;
+}
+
+static int has_stereo_resources(xmlNodePtr element)
+{
+    if (xmlStrcmp(element->name, "Left") == 0 || xmlStrcmp(element->name, "Right") == 0)
+        return 1;
+
+    element = xmlFirstElementChild(element);
+    while (element) {
+        if (has_stereo_resources(element))
+            return 1;
+
+        element = xmlNextElementSibling(element);
+    }
+
+    return 0;
+}
+
+static int push_main_audio_sequence(xmlNodePtr audio_sequence_elem, FFIMFCPL *cpl)
+{
+    int ret = 0;
+    uint8_t uuid[16];
+    xmlNodePtr resource_list_elem = NULL;
+    xmlNodePtr resource_elem = NULL;
+    xmlNodePtr track_id_elem = NULL;
+    unsigned long resource_elem_count;
+    FFIMFTrackFileVirtualTrack *vt = NULL;
+    void *tmp;
+
+    /* read TrackID element */
+    if (!(track_id_elem = ff_imf_xml_get_child_element_by_name(audio_sequence_elem, "TrackId"))) {
+        av_log(NULL, AV_LOG_ERROR, "TrackId element missing from audio sequence\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if ((ret = ff_imf_xml_read_uuid(track_id_elem, uuid))) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid TrackId element found in audio sequence\n");
+        return ret;
+    }
+    av_log(NULL,
+           AV_LOG_DEBUG,
+           "Processing IMF CPL Audio Sequence for Virtual Track " FF_IMF_UUID_FORMAT "\n",
+           UID_ARG(uuid));
+
+    /* get the main audio virtual track corresponding to the sequence */
+    for (uint32_t i = 0; i < cpl->main_audio_track_count; i++) {
+        if (memcmp(cpl->main_audio_tracks[i].base.id_uuid, uuid, sizeof(uuid)) == 0) {
+            vt = &cpl->main_audio_tracks[i];
+            break;
+        }
+    }
+
+    /* create a main audio virtual track if none exists for the sequence */
+    if (!vt) {
+        if (cpl->main_audio_track_count == UINT32_MAX)
+            return AVERROR(ENOMEM);
+        tmp = av_realloc_array(cpl->main_audio_tracks,
+                               cpl->main_audio_track_count + 1,
+                               sizeof(FFIMFTrackFileVirtualTrack));
+        if (!tmp)
+            return AVERROR(ENOMEM);
+
+        cpl->main_audio_tracks = tmp;
+        vt = &cpl->main_audio_tracks[cpl->main_audio_track_count];
+        imf_trackfile_virtual_track_init(vt);
+        cpl->main_audio_track_count++;
+        memcpy(vt->base.id_uuid, uuid, sizeof(uuid));
+    }
+
+    /* process resources */
+    resource_list_elem = ff_imf_xml_get_child_element_by_name(audio_sequence_elem, "ResourceList");
+    if (!resource_list_elem)
+        return 0;
+
+    resource_elem_count = xmlChildElementCount(resource_list_elem);
+    if (resource_elem_count > UINT32_MAX
+        || vt->resource_count > UINT32_MAX - resource_elem_count)
+        return AVERROR(ENOMEM);
+    tmp = av_fast_realloc(vt->resources,
+                          &vt->resources_alloc_sz,
+                          (vt->resource_count + resource_elem_count)
+                              * sizeof(FFIMFTrackFileResource));
+    if (!tmp) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot allocate Main Audio Resources\n");
+        return AVERROR(ENOMEM);
+    }
+    vt->resources = tmp;
+
+    resource_elem = xmlFirstElementChild(resource_list_elem);
+    while (resource_elem) {
+        imf_trackfile_resource_init(&vt->resources[vt->resource_count]);
+        ret = fill_trackfile_resource(resource_elem,
+                                      &vt->resources[vt->resource_count],
+                                      cpl);
+        vt->resource_count++;
+        if (ret) {
+            av_log(NULL, AV_LOG_ERROR, "Invalid Resource\n");
+            continue;
+        }
+
+        resource_elem = xmlNextElementSibling(resource_elem);
+    }
+
+    return ret;
+}
+
+static int push_main_image_2d_sequence(xmlNodePtr image_sequence_elem, FFIMFCPL *cpl)
+{
+    int ret = 0;
+    uint8_t uuid[16];
+    xmlNodePtr resource_list_elem = NULL;
+    xmlNodePtr resource_elem = NULL;
+    xmlNodePtr track_id_elem = NULL;
+    void *tmp;
+    unsigned long resource_elem_count;
+
+    /* skip stereoscopic resources */
+    if (has_stereo_resources(image_sequence_elem)) {
+        av_log(NULL, AV_LOG_ERROR, "Stereoscopic 3D image virtual tracks not supported\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    /* read TrackId element*/
+    if (!(track_id_elem = ff_imf_xml_get_child_element_by_name(image_sequence_elem, "TrackId"))) {
+        av_log(NULL, AV_LOG_ERROR, "TrackId element missing from audio sequence\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if ((ret = ff_imf_xml_read_uuid(track_id_elem, uuid))) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid TrackId element found in audio sequence\n");
+        return ret;
+    }
+
+    /* create main image virtual track if one does not exist */
+    if (!cpl->main_image_2d_track) {
+        cpl->main_image_2d_track = av_malloc(sizeof(FFIMFTrackFileVirtualTrack));
+        if (!cpl->main_image_2d_track)
+            return AVERROR(ENOMEM);
+        imf_trackfile_virtual_track_init(cpl->main_image_2d_track);
+        memcpy(cpl->main_image_2d_track->base.id_uuid, uuid, sizeof(uuid));
+
+    } else if (memcmp(cpl->main_image_2d_track->base.id_uuid, uuid, sizeof(uuid)) != 0) {
+        av_log(NULL, AV_LOG_ERROR, "Multiple MainImage virtual tracks found\n");
+        return AVERROR_INVALIDDATA;
+    }
+    av_log(NULL,
+           AV_LOG_DEBUG,
+           "Processing IMF CPL Main Image Sequence for Virtual Track " FF_IMF_UUID_FORMAT "\n",
+           UID_ARG(uuid));
+
+    /* process resources */
+    resource_list_elem = ff_imf_xml_get_child_element_by_name(image_sequence_elem, "ResourceList");
+    if (!resource_list_elem)
+        return 0;
+
+    resource_elem_count = xmlChildElementCount(resource_list_elem);
+    if (resource_elem_count > UINT32_MAX
+        || cpl->main_image_2d_track->resource_count > UINT32_MAX - resource_elem_count
+        || (cpl->main_image_2d_track->resource_count + resource_elem_count)
+            > INT_MAX / sizeof(FFIMFTrackFileResource))
+        return AVERROR(ENOMEM);
+    tmp = av_fast_realloc(cpl->main_image_2d_track->resources,
+                          &cpl->main_image_2d_track->resources_alloc_sz,
+                          (cpl->main_image_2d_track->resource_count + resource_elem_count)
+                              * sizeof(FFIMFTrackFileResource));
+    if (!tmp) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot allocate Main Image Resources\n");
+        return AVERROR(ENOMEM);
+    }
+    cpl->main_image_2d_track->resources = tmp;
+
+    resource_elem = xmlFirstElementChild(resource_list_elem);
+    while (resource_elem) {
+        imf_trackfile_resource_init(
+            &cpl->main_image_2d_track->resources[cpl->main_image_2d_track->resource_count]);
+        ret = fill_trackfile_resource(resource_elem,
+                                      &cpl->main_image_2d_track->resources[cpl->main_image_2d_track->resource_count],
+                                      cpl);
+        cpl->main_image_2d_track->resource_count++;
+        if (ret) {
+            av_log(NULL, AV_LOG_ERROR, "Invalid Resource\n");
+            continue;
+        }
+
+        resource_elem = xmlNextElementSibling(resource_elem);
+    }
+
+    return 0;
+}
+
+static int fill_virtual_tracks(xmlNodePtr cpl_element, FFIMFCPL *cpl)
+{
+    int ret = 0;
+    xmlNodePtr segment_list_elem = NULL;
+    xmlNodePtr segment_elem = NULL;
+    xmlNodePtr sequence_list_elem = NULL;
+    xmlNodePtr sequence_elem = NULL;
+
+    if (!(segment_list_elem = ff_imf_xml_get_child_element_by_name(cpl_element, "SegmentList"))) {
+        av_log(NULL, AV_LOG_ERROR, "SegmentList element missing\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* process sequences */
+    segment_elem = xmlFirstElementChild(segment_list_elem);
+    while (segment_elem) {
+        av_log(NULL, AV_LOG_DEBUG, "Processing IMF CPL Segment\n");
+
+        sequence_list_elem = ff_imf_xml_get_child_element_by_name(segment_elem, "SequenceList");
+        if (!segment_list_elem)
+            continue;
+
+        sequence_elem = xmlFirstElementChild(sequence_list_elem);
+        while (sequence_elem) {
+            if (xmlStrcmp(sequence_elem->name, "MarkerSequence") == 0)
+                ret = push_marker_sequence(sequence_elem, cpl);
+
+            else if (xmlStrcmp(sequence_elem->name, "MainImageSequence") == 0)
+                ret = push_main_image_2d_sequence(sequence_elem, cpl);
+
+            else if (xmlStrcmp(sequence_elem->name, "MainAudioSequence") == 0)
+                ret = push_main_audio_sequence(sequence_elem, cpl);
+
+            else
+                av_log(NULL,
+                       AV_LOG_INFO,
+                       "The following Sequence is not supported and is ignored: %s\n",
+                       sequence_elem->name);
+
+            /* abort parsing only if memory error occurred */
+            if (ret == AVERROR(ENOMEM))
+                return ret;
+
+            sequence_elem = xmlNextElementSibling(sequence_elem);
+        }
+
+        segment_elem = xmlNextElementSibling(segment_elem);
+    }
+
+    return ret;
+}
+
+int ff_imf_parse_cpl_from_xml_dom(xmlDocPtr doc, FFIMFCPL **cpl)
+{
+    int ret = 0;
+    xmlNodePtr cpl_element = NULL;
+
+    *cpl = ff_imf_cpl_alloc();
+    if (!*cpl) {
+        ret = AVERROR(ENOMEM);
+        goto cleanup;
+    }
+
+    cpl_element = xmlDocGetRootElement(doc);
+    if (xmlStrcmp(cpl_element->name, "CompositionPlaylist")) {
+        av_log(NULL, AV_LOG_ERROR, "The root element of the CPL is not CompositionPlaylist\n");
+        ret = AVERROR_INVALIDDATA;
+        goto cleanup;
+    }
+
+    if ((ret = fill_content_title(cpl_element, *cpl)))
+        goto cleanup;
+    if ((ret = fill_id(cpl_element, *cpl)))
+        goto cleanup;
+    if ((ret = fill_edit_rate(cpl_element, *cpl)))
+        goto cleanup;
+    if ((ret = fill_virtual_tracks(cpl_element, *cpl)))
+        goto cleanup;
+
+cleanup:
+    if (*cpl && ret) {
+        ff_imf_cpl_free(*cpl);
+        *cpl = NULL;
+    }
+    return ret;
+}
+
+static void imf_marker_free(FFIMFMarker *marker)
+{
+    if (!marker)
+        return;
+    xmlFree(marker->label_utf8);
+    xmlFree(marker->scope_utf8);
+}
+
+static void imf_marker_resource_free(FFIMFMarkerResource *rsrc)
+{
+    if (!rsrc)
+        return;
+    for (uint32_t i = 0; i < rsrc->marker_count; i++)
+        imf_marker_free(&rsrc->markers[i]);
+    av_freep(&rsrc->markers);
+}
+
+static void imf_marker_virtual_track_free(FFIMFMarkerVirtualTrack *vt)
+{
+    if (!vt)
+        return;
+    for (uint32_t i = 0; i < vt->resource_count; i++)
+        imf_marker_resource_free(&vt->resources[i]);
+    av_freep(&vt->resources);
+}
+
+static void imf_trackfile_virtual_track_free(FFIMFTrackFileVirtualTrack *vt)
+{
+    if (!vt)
+        return;
+    av_freep(&vt->resources);
+}
+
+static void imf_cpl_init(FFIMFCPL *cpl)
+{
+    memset(cpl->id_uuid, 0, sizeof(cpl->id_uuid));
+    cpl->content_title_utf8 = NULL;
+    cpl->edit_rate = av_make_q(0, 1);
+    cpl->main_markers_track = NULL;
+    cpl->main_image_2d_track = NULL;
+    cpl->main_audio_track_count = 0;
+    cpl->main_audio_tracks = NULL;
+}
+
+FFIMFCPL *ff_imf_cpl_alloc(void)
+{
+    FFIMFCPL *cpl;
+
+    cpl = av_malloc(sizeof(FFIMFCPL));
+    if (!cpl)
+        return NULL;
+    imf_cpl_init(cpl);
+    return cpl;
+}
+
+void ff_imf_cpl_free(FFIMFCPL *cpl)
+{
+    if (!cpl)
+        return;
+
+    xmlFree(cpl->content_title_utf8);
+
+    imf_marker_virtual_track_free(cpl->main_markers_track);
+
+    if (cpl->main_markers_track)
+        av_freep(&cpl->main_markers_track);
+
+    imf_trackfile_virtual_track_free(cpl->main_image_2d_track);
+
+    if (cpl->main_image_2d_track)
+        av_freep(&cpl->main_image_2d_track);
+
+    for (uint32_t i = 0; i < cpl->main_audio_track_count; i++)
+        imf_trackfile_virtual_track_free(&cpl->main_audio_tracks[i]);
+
+    if (cpl->main_audio_tracks)
+        av_freep(&cpl->main_audio_tracks);
+
+    av_freep(&cpl);
+}
+
+int ff_imf_parse_cpl(AVIOContext *in, FFIMFCPL **cpl)
+{
+    AVBPrint buf;
+    xmlDoc *doc = NULL;
+    int ret = 0;
+    int64_t filesize = 0;
+
+    filesize = avio_size(in);
+    filesize = filesize > 0 ? filesize : 8192;
+    av_bprint_init(&buf, filesize + 1, AV_BPRINT_SIZE_UNLIMITED);
+    ret = avio_read_to_bprint(in, &buf, UINT_MAX - 1);
+    if (ret < 0 || !avio_feof(in) || buf.len == 0) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot read IMF CPL\n");
+        if (ret == 0)
+            ret = AVERROR_INVALIDDATA;
+    } else {
+        LIBXML_TEST_VERSION
+
+        filesize = buf.len;
+        doc = xmlReadMemory(buf.str, filesize, NULL, NULL, 0);
+        if (!doc) {
+            av_log(NULL,
+                   AV_LOG_ERROR,
+                   "XML parsing failed when reading the IMF CPL\n");
+            ret = AVERROR_INVALIDDATA;
+        }
+
+        if ((ret = ff_imf_parse_cpl_from_xml_dom(doc, cpl))) {
+            av_log(NULL, AV_LOG_ERROR, "Cannot parse IMF CPL\n");
+        } else {
+            av_log(NULL,
+                   AV_LOG_INFO,
+                   "IMF CPL ContentTitle: %s\n",
+                   (*cpl)->content_title_utf8);
+            av_log(NULL,
+                   AV_LOG_INFO,
+                   "IMF CPL Id: " FF_IMF_UUID_FORMAT "\n",
+                   UID_ARG((*cpl)->id_uuid));
+        }
+
+        xmlFreeDoc(doc);
+    }
+
+    av_bprint_finalize(&buf, NULL);
+
+    return ret;
+}
diff --git a/libavformat/imfdec.c b/libavformat/imfdec.c
new file mode 100644
index 0000000000..f17064cfcd
--- /dev/null
+++ b/libavformat/imfdec.c
@@ -0,0 +1,899 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ *
+ * Copyright (c) Sandflow Consulting LLC
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * Demuxes an IMF Composition
+ *
+ * References
+ * OV 2067-0:2018 - SMPTE Overview Document - Interoperable Master Format
+ * ST 2067-2:2020 - SMPTE Standard - Interoperable Master Format — Core Constraints
+ * ST 2067-3:2020 - SMPTE Standard - Interoperable Master Format — Composition Playlist
+ * ST 2067-5:2020 - SMPTE Standard - Interoperable Master Format — Essence Component
+ * ST 2067-20:2016 - SMPTE Standard - Interoperable Master Format — Application #2
+ * ST 2067-21:2020 - SMPTE Standard - Interoperable Master Format — Application #2 Extended
+ * ST 2067-102:2017 - SMPTE Standard - Interoperable Master Format — Common Image Pixel Color Schemes
+ * ST 429-9:2007 - SMPTE Standard - D-Cinema Packaging — Asset Mapping and File Segmentation
+ *
+ * @author Marc-Antoine Arnaud
+ * @author Valentin Noel
+ * @author Nicholas Vanderzwet
+ * @file
+ * @ingroup lavu_imf
+ */
+
+#include "avio_internal.h"
+#include "imf.h"
+#include "internal.h"
+#include "libavutil/avstring.h"
+#include "libavutil/bprint.h"
+#include "libavutil/opt.h"
+#include "mxf.h"
+#include "url.h"
+#include <inttypes.h>
+#include <libxml/parser.h>
+
+#define MAX_BPRINT_READ_SIZE (UINT_MAX - 1)
+#define DEFAULT_ASSETMAP_SIZE 8 * 1024
+#define AVRATIONAL_FORMAT "%d/%d"
+#define AVRATIONAL_ARG(rational) rational.num, rational.den
+
+/**
+ * IMF Asset locator
+ */
+typedef struct IMFAssetLocator {
+    FFIMFUUID uuid;
+    char *absolute_uri;
+} IMFAssetLocator;
+
+/**
+ * IMF Asset locator map
+ * Results from the parsing of one or more ASSETMAP XML files
+ */
+typedef struct IMFAssetLocatorMap {
+    uint32_t asset_count;
+    IMFAssetLocator *assets;
+} IMFAssetLocatorMap;
+
+typedef struct IMFVirtualTrackResourcePlaybackCtx {
+    IMFAssetLocator *locator;
+    FFIMFTrackFileResource *resource;
+    AVFormatContext *ctx;
+} IMFVirtualTrackResourcePlaybackCtx;
+
+typedef struct IMFVirtualTrackPlaybackCtx {
+    int32_t index;                                 /**< Track index in playlist */
+    AVRational current_timestamp;                  /**< Current temporal position */
+    AVRational duration;                           /**< Overall duration */
+    uint32_t resource_count;                       /**< Number of resources */
+    unsigned int resources_alloc_sz;               /**< Size of the buffer holding the resource */
+    IMFVirtualTrackResourcePlaybackCtx *resources; /**< Buffer holding the resources */
+    uint32_t current_resource_index;               /**< Current resource */
+    int64_t last_pts;                              /**< Last timestamp */
+} IMFVirtualTrackPlaybackCtx;
+
+typedef struct IMFContext {
+    const AVClass *class;
+    const char *base_url;
+    char *asset_map_paths;
+    AVIOInterruptCB *interrupt_callback;
+    AVDictionary *avio_opts;
+    FFIMFCPL *cpl;
+    IMFAssetLocatorMap asset_locator_map;
+    uint32_t track_count;
+    IMFVirtualTrackPlaybackCtx **tracks;
+} IMFContext;
+
+static int imf_uri_is_url(const char *string)
+{
+    return strstr(string, "://") != NULL;
+}
+
+static int imf_uri_is_unix_abs_path(const char *string)
+{
+    return string[0] == '/';
+}
+
+static int imf_uri_is_dos_abs_path(const char *string)
+{
+    /* Absolute path case: `C:\path\to\somwhere` */
+    if (string[1] == ':' && string[2] == '\\')
+        return 1;
+
+    /* Absolute path case: `C:/path/to/somwhere` */
+    if (string[1] == ':' && string[2] == '/')
+        return 1;
+
+    /* Network path case: `\\path\to\somwhere` */
+    if (string[0] == '\\' && string[1] == '\\')
+        return 1;
+
+    return 0;
+}
+
+/**
+ * Parse a ASSETMAP XML file to extract the UUID-URI mapping of assets.
+ * @param s the current format context, if any (can be NULL).
+ * @param doc the XML document to be parsed.
+ * @param asset_map pointer on the IMFAssetLocatorMap to fill.
+ * @param base_url the url of the asset map XML file, if any (can be NULL).
+ * @return a negative value in case of error, 0 otherwise.
+ */
+static int parse_imf_asset_map_from_xml_dom(AVFormatContext *s,
+                                            xmlDocPtr doc,
+                                            IMFAssetLocatorMap *asset_map,
+                                            const char *base_url)
+{
+    xmlNodePtr asset_map_element = NULL;
+    xmlNodePtr node = NULL;
+    xmlNodePtr asset_element = NULL;
+    unsigned long elem_count;
+    char *uri;
+    int ret = 0;
+    IMFAssetLocator *asset = NULL;
+    void *tmp;
+
+    asset_map_element = xmlDocGetRootElement(doc);
+
+    if (!asset_map_element) {
+        av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing root node\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (asset_map_element->type != XML_ELEMENT_NODE || av_strcasecmp(asset_map_element->name, "AssetMap")) {
+        av_log(s,
+               AV_LOG_ERROR,
+               "Unable to parse asset map XML - wrong root node name[%s] type[%d]\n",
+               asset_map_element->name,
+               (int)asset_map_element->type);
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* parse asset locators */
+    if (!(node = ff_imf_xml_get_child_element_by_name(asset_map_element, "AssetList"))) {
+        av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing AssetList node\n");
+        return AVERROR_INVALIDDATA;
+    }
+    elem_count = xmlChildElementCount(node);
+    if (elem_count > UINT32_MAX
+        || asset_map->asset_count > UINT32_MAX - elem_count)
+        return AVERROR(ENOMEM);
+    tmp = av_realloc_array(asset_map->assets,
+                           elem_count + asset_map->asset_count,
+                           sizeof(IMFAssetLocator));
+    if (!tmp) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot allocate IMF asset locators\n");
+        return AVERROR(ENOMEM);
+    }
+    asset_map->assets = tmp;
+
+    asset_element = xmlFirstElementChild(node);
+    while (asset_element) {
+        if (av_strcasecmp(asset_element->name, "Asset") != 0)
+            continue;
+
+        asset = &(asset_map->assets[asset_map->asset_count]);
+
+        if (ff_imf_xml_read_uuid(ff_imf_xml_get_child_element_by_name(asset_element, "Id"), asset->uuid)) {
+            av_log(s, AV_LOG_ERROR, "Could not parse UUID from asset in asset map.\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        av_log(s, AV_LOG_DEBUG, "Found asset id: " FF_IMF_UUID_FORMAT "\n", UID_ARG(asset->uuid));
+
+        if (!(node = ff_imf_xml_get_child_element_by_name(asset_element, "ChunkList"))) {
+            av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing ChunkList node\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (!(node = ff_imf_xml_get_child_element_by_name(node, "Chunk"))) {
+            av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing Chunk node\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        uri = xmlNodeGetContent(ff_imf_xml_get_child_element_by_name(node, "Path"));
+        if (!imf_uri_is_url(uri) && !imf_uri_is_unix_abs_path(uri) && !imf_uri_is_dos_abs_path(uri))
+            asset->absolute_uri = av_append_path_component(base_url, uri);
+        else
+            asset->absolute_uri = av_strdup(uri);
+        xmlFree(uri);
+        if (!asset->absolute_uri)
+            return AVERROR(ENOMEM);
+
+        av_log(s, AV_LOG_DEBUG, "Found asset absolute URI: %s\n", asset->absolute_uri);
+
+        asset_map->asset_count++;
+        asset_element = xmlNextElementSibling(asset_element);
+    }
+
+    return ret;
+}
+
+/**
+ * Initializes an IMFAssetLocatorMap structure.
+ */
+static void imf_asset_locator_map_init(IMFAssetLocatorMap *asset_map)
+{
+    asset_map->assets = NULL;
+    asset_map->asset_count = 0;
+}
+
+/**
+ * Free a IMFAssetLocatorMap pointer.
+ */
+static void imf_asset_locator_map_deinit(IMFAssetLocatorMap *asset_map)
+{
+    for (uint32_t i = 0; i < asset_map->asset_count; ++i)
+        av_freep(&asset_map->assets[i].absolute_uri);
+
+    av_freep(&asset_map->assets);
+}
+
+static int parse_assetmap(AVFormatContext *s, const char *url)
+{
+    IMFContext *c = s->priv_data;
+    AVIOContext *in = NULL;
+    struct AVBPrint buf;
+    AVDictionary *opts = NULL;
+    xmlDoc *doc = NULL;
+    const char *base_url;
+    char *tmp_str = NULL;
+    int ret;
+    int64_t filesize;
+
+    av_log(s, AV_LOG_DEBUG, "Asset Map URL: %s\n", url);
+
+    av_dict_copy(&opts, c->avio_opts, 0);
+    ret = s->io_open(s, &in, url, AVIO_FLAG_READ, &opts);
+    av_dict_free(&opts);
+    if (ret < 0)
+        return ret;
+
+    filesize = avio_size(in);
+    filesize = filesize > 0 ? filesize : DEFAULT_ASSETMAP_SIZE;
+
+    av_bprint_init(&buf, filesize + 1, AV_BPRINT_SIZE_UNLIMITED);
+
+    ret = avio_read_to_bprint(in, &buf, MAX_BPRINT_READ_SIZE);
+    if (ret < 0 || !avio_feof(in) || buf.len == 0) {
+        av_log(s, AV_LOG_ERROR, "Unable to read to asset map '%s'\n", url);
+        if (ret == 0)
+            ret = AVERROR_INVALIDDATA;
+        goto clean_up;
+    }
+
+    LIBXML_TEST_VERSION
+
+    tmp_str = av_strdup(url);
+    if (!tmp_str) {
+        ret = AVERROR(ENOMEM);
+        goto clean_up;
+    }
+    base_url = av_dirname(tmp_str);
+
+    filesize = buf.len;
+    doc = xmlReadMemory(buf.str, filesize, url, NULL, 0);
+
+    ret = parse_imf_asset_map_from_xml_dom(s, doc, &c->asset_locator_map, base_url);
+    if (!ret)
+        av_log(s,
+               AV_LOG_DEBUG,
+               "Found %d assets from %s\n",
+               c->asset_locator_map.asset_count,
+               url);
+
+    xmlFreeDoc(doc);
+
+clean_up:
+    if (tmp_str)
+        av_freep(&tmp_str);
+    ff_format_io_close(s, &in);
+    av_bprint_finalize(&buf, NULL);
+    return ret;
+}
+
+static IMFAssetLocator *find_asset_map_locator(IMFAssetLocatorMap *asset_map, FFIMFUUID uuid)
+{
+    for (uint32_t i = 0; i < asset_map->asset_count; ++i) {
+        if (memcmp(asset_map->assets[i].uuid, uuid, 16) == 0)
+            return &(asset_map->assets[i]);
+    }
+    return NULL;
+}
+
+static int open_track_resource_context(AVFormatContext *s,
+                                       IMFVirtualTrackResourcePlaybackCtx *track_resource)
+{
+    IMFContext *c = s->priv_data;
+    int ret = 0;
+    int64_t entry_point;
+    AVDictionary *opts = NULL;
+
+    if (track_resource->ctx) {
+        av_log(s,
+               AV_LOG_DEBUG,
+               "Input context already opened for %s.\n",
+               track_resource->locator->absolute_uri);
+        return 0;
+    }
+
+    track_resource->ctx = avformat_alloc_context();
+    if (!track_resource->ctx)
+        return AVERROR(ENOMEM);
+
+    track_resource->ctx->io_open = s->io_open;
+    track_resource->ctx->io_close = s->io_close;
+    track_resource->ctx->io_close2 = s->io_close2;
+    track_resource->ctx->flags |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
+
+    if ((ret = ff_copy_whiteblacklists(track_resource->ctx, s)) < 0)
+        goto cleanup;
+
+    if ((ret = av_opt_set(track_resource->ctx, "format_whitelist", "mxf", 0)))
+        goto cleanup;
+
+    if ((ret = av_dict_copy(&opts, c->avio_opts, 0)) < 0)
+        goto cleanup;
+
+    ret = avformat_open_input(&track_resource->ctx,
+                              track_resource->locator->absolute_uri,
+                              NULL,
+                              &opts);
+    if (ret < 0) {
+        av_log(s,
+               AV_LOG_ERROR,
+               "Could not open %s input context: %s\n",
+               track_resource->locator->absolute_uri,
+               av_err2str(ret));
+        goto cleanup;
+    }
+    av_dict_free(&opts);
+
+    /* Compare the source timebase to the resource edit rate,
+     * considering the first stream of the source file
+     */
+    if (av_cmp_q(track_resource->ctx->streams[0]->time_base,
+                 av_inv_q(track_resource->resource->base.edit_rate)))
+        av_log(s,
+               AV_LOG_WARNING,
+               "Incoherent source stream timebase %d/%d regarding resource edit rate: %d/%d",
+               track_resource->ctx->streams[0]->time_base.num,
+               track_resource->ctx->streams[0]->time_base.den,
+               track_resource->resource->base.edit_rate.den,
+               track_resource->resource->base.edit_rate.num);
+
+    entry_point = (int64_t)track_resource->resource->base.entry_point
+        * track_resource->resource->base.edit_rate.den
+        * AV_TIME_BASE
+        / track_resource->resource->base.edit_rate.num;
+
+    if (entry_point) {
+        av_log(s,
+               AV_LOG_DEBUG,
+               "Seek at resource %s entry point: %" PRIu32 "\n",
+               track_resource->locator->absolute_uri,
+               track_resource->resource->base.entry_point);
+        ret = avformat_seek_file(track_resource->ctx, -1, entry_point, entry_point, entry_point, 0);
+        if (ret < 0) {
+            av_log(s,
+                   AV_LOG_ERROR,
+                   "Could not seek at %" PRId64 "on %s: %s\n",
+                   entry_point,
+                   track_resource->locator->absolute_uri,
+                   av_err2str(ret));
+            avformat_close_input(&track_resource->ctx);
+            return ret;
+        }
+    }
+
+    return 0;
+
+cleanup:
+    av_dict_free(&opts);
+    avformat_free_context(track_resource->ctx);
+    track_resource->ctx = NULL;
+    return ret;
+}
+
+static int open_track_file_resource(AVFormatContext *s,
+                                    FFIMFTrackFileResource *track_file_resource,
+                                    IMFVirtualTrackPlaybackCtx *track)
+{
+    IMFContext *c = s->priv_data;
+    IMFAssetLocator *asset_locator;
+    void *tmp;
+    int ret;
+
+    asset_locator = find_asset_map_locator(&c->asset_locator_map, track_file_resource->track_file_uuid);
+    if (!asset_locator) {
+        av_log(s,
+               AV_LOG_ERROR,
+               "Could not find asset locator for UUID: " FF_IMF_UUID_FORMAT "\n",
+               UID_ARG(track_file_resource->track_file_uuid));
+        return AVERROR_INVALIDDATA;
+    }
+
+    av_log(s,
+           AV_LOG_DEBUG,
+           "Found locator for " FF_IMF_UUID_FORMAT ": %s\n",
+           UID_ARG(asset_locator->uuid),
+           asset_locator->absolute_uri);
+
+    if (track->resource_count > UINT32_MAX - track_file_resource->base.repeat_count
+        || (track->resource_count + track_file_resource->base.repeat_count)
+            > INT_MAX / sizeof(IMFVirtualTrackResourcePlaybackCtx))
+        return AVERROR(ENOMEM);
+    tmp = av_fast_realloc(track->resources,
+                          &track->resources_alloc_sz,
+                          (track->resource_count + track_file_resource->base.repeat_count)
+                              * sizeof(IMFVirtualTrackResourcePlaybackCtx));
+    if (!tmp)
+        return AVERROR(ENOMEM);
+    track->resources = tmp;
+
+    for (uint32_t i = 0; i < track_file_resource->base.repeat_count; ++i) {
+        IMFVirtualTrackResourcePlaybackCtx vt_ctx;
+
+        vt_ctx.locator = asset_locator;
+        vt_ctx.resource = track_file_resource;
+        vt_ctx.ctx = NULL;
+        if ((ret = open_track_resource_context(s, &vt_ctx)) != 0)
+            return ret;
+        track->resources[track->resource_count++] = vt_ctx;
+        track->duration = av_add_q(track->duration,
+                                   av_make_q((int)track_file_resource->base.duration
+                                                 * track_file_resource->base.edit_rate.den,
+                                             track_file_resource->base.edit_rate.num));
+    }
+
+    return 0;
+}
+
+static void imf_virtual_track_playback_context_deinit(IMFVirtualTrackPlaybackCtx *track)
+{
+    for (uint32_t i = 0; i < track->resource_count; ++i)
+        avformat_close_input(&track->resources[i].ctx);
+
+    av_freep(&track->resources);
+}
+
+static int open_virtual_track(AVFormatContext *s,
+                              FFIMFTrackFileVirtualTrack *virtual_track,
+                              int32_t track_index)
+{
+    IMFContext *c = s->priv_data;
+    IMFVirtualTrackPlaybackCtx *track = NULL;
+    void *tmp;
+    int ret = 0;
+
+    if (!(track = av_mallocz(sizeof(IMFVirtualTrackPlaybackCtx))))
+        return AVERROR(ENOMEM);
+    track->index = track_index;
+    track->duration = av_make_q(0, 1);
+
+    for (uint32_t i = 0; i < virtual_track->resource_count; i++) {
+        av_log(s,
+               AV_LOG_DEBUG,
+               "Open stream from file " FF_IMF_UUID_FORMAT ", stream %d\n",
+               UID_ARG(virtual_track->resources[i].track_file_uuid),
+               i);
+        if ((ret = open_track_file_resource(s, &virtual_track->resources[i], track)) != 0) {
+            av_log(s,
+                   AV_LOG_ERROR,
+                   "Could not open image track resource " FF_IMF_UUID_FORMAT "\n",
+                   UID_ARG(virtual_track->resources[i].track_file_uuid));
+            goto clean_up;
+        }
+    }
+
+    track->current_timestamp = av_make_q(0, track->duration.den);
+
+    if (c->track_count == UINT32_MAX) {
+        ret = AVERROR(ENOMEM);
+        goto clean_up;
+    }
+    tmp = av_realloc_array(c->tracks, c->track_count + 1, sizeof(IMFVirtualTrackPlaybackCtx *));
+    if (!tmp) {
+        ret = AVERROR(ENOMEM);
+        goto clean_up;
+    }
+    c->tracks = tmp;
+    c->tracks[c->track_count++] = track;
+
+    return 0;
+
+clean_up:
+    imf_virtual_track_playback_context_deinit(track);
+    av_free(track);
+    return ret;
+}
+
+static int set_context_streams_from_tracks(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+    int ret = 0;
+
+    for (uint32_t i = 0; i < c->track_count; ++i) {
+        AVStream *asset_stream;
+        AVStream *first_resource_stream;
+
+        /* Open the first resource of the track to get stream information */
+        first_resource_stream = c->tracks[i]->resources[0].ctx->streams[0];
+        av_log(s, AV_LOG_DEBUG, "Open the first resource of track %d\n", c->tracks[i]->index);
+
+        /* Copy stream information */
+        asset_stream = avformat_new_stream(s, NULL);
+        if (!asset_stream) {
+            ret = AVERROR(ENOMEM);
+            av_log(s, AV_LOG_ERROR, "Could not create stream\n");
+            break;
+        }
+        asset_stream->id = i;
+        ret = avcodec_parameters_copy(asset_stream->codecpar, first_resource_stream->codecpar);
+        if (ret < 0) {
+            av_log(s, AV_LOG_ERROR, "Could not copy stream parameters\n");
+            return ret;
+        }
+        avpriv_set_pts_info(asset_stream,
+                            first_resource_stream->pts_wrap_bits,
+                            first_resource_stream->time_base.num,
+                            first_resource_stream->time_base.den);
+        asset_stream->duration = (int64_t)av_q2d(av_mul_q(c->tracks[i]->duration,
+                                                          av_inv_q(asset_stream->time_base)));
+    }
+
+    return 0;
+}
+
+static int open_cpl_tracks(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+    int32_t track_index = 0;
+    int ret;
+
+    if (c->cpl->main_image_2d_track) {
+        if ((ret = open_virtual_track(s, c->cpl->main_image_2d_track, track_index++)) != 0) {
+            av_log(s,
+                   AV_LOG_ERROR,
+                   "Could not open image track " FF_IMF_UUID_FORMAT "\n",
+                   UID_ARG(c->cpl->main_image_2d_track->base.id_uuid));
+            return ret;
+        }
+    }
+
+    for (uint32_t i = 0; i < c->cpl->main_audio_track_count; ++i) {
+        if ((ret = open_virtual_track(s, &c->cpl->main_audio_tracks[i], track_index++)) != 0) {
+            av_log(s,
+                   AV_LOG_ERROR,
+                   "Could not open audio track " FF_IMF_UUID_FORMAT "\n",
+                   UID_ARG(c->cpl->main_audio_tracks[i].base.id_uuid));
+            return ret;
+        }
+    }
+
+    return set_context_streams_from_tracks(s);
+}
+
+static int imf_read_header(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+    char *asset_map_path;
+    char *tmp_str;
+    int ret = 0;
+
+    c->interrupt_callback = &s->interrupt_callback;
+    tmp_str = av_strdup(s->url);
+    if (!tmp_str)
+        return AVERROR(ENOMEM);
+
+    c->base_url = av_dirname(tmp_str);
+    if ((ret = ffio_copy_url_options(s->pb, &c->avio_opts)) < 0)
+        return ret;
+
+    av_log(s, AV_LOG_DEBUG, "start parsing IMF CPL: %s\n", s->url);
+
+    if ((ret = ff_imf_parse_cpl(s->pb, &c->cpl)) < 0)
+        return ret;
+
+    av_log(s,
+           AV_LOG_DEBUG,
+           "parsed IMF CPL: " FF_IMF_UUID_FORMAT "\n",
+           UID_ARG(c->cpl->id_uuid));
+
+    if (!c->asset_map_paths) {
+        c->asset_map_paths = av_append_path_component(c->base_url, "ASSETMAP.xml");
+        if (!c->asset_map_paths) {
+            ret = AVERROR(ENOMEM);
+            return ret;
+        }
+        av_log(s, AV_LOG_DEBUG, "No asset maps provided, using the default ASSETMAP.xml\n");
+    }
+
+    /* Parse each asset map XML file */
+    imf_asset_locator_map_init(&c->asset_locator_map);
+    asset_map_path = av_strtok(c->asset_map_paths, ",", &tmp_str);
+    while (asset_map_path != NULL) {
+        av_log(s, AV_LOG_DEBUG, "start parsing IMF Asset Map: %s\n", asset_map_path);
+
+        if ((ret = parse_assetmap(s, asset_map_path)))
+            return ret;
+
+        asset_map_path = av_strtok(NULL, ",", &tmp_str);
+    }
+
+    av_log(s, AV_LOG_DEBUG, "parsed IMF Asset Maps\n");
+
+    if ((ret = open_cpl_tracks(s)))
+        return ret;
+
+    av_log(s, AV_LOG_DEBUG, "parsed IMF package\n");
+
+    return 0;
+}
+
+static IMFVirtualTrackPlaybackCtx *get_next_track_with_minimum_timestamp(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+    IMFVirtualTrackPlaybackCtx *track;
+
+    AVRational minimum_timestamp = av_make_q(INT32_MAX, 1);
+    for (uint32_t i = c->track_count; i > 0; i--) {
+        av_log(s,
+               AV_LOG_DEBUG,
+               "Compare track %d timestamp " AVRATIONAL_FORMAT
+               " to minimum " AVRATIONAL_FORMAT
+               " (over duration: " AVRATIONAL_FORMAT
+               ")\n",
+               i,
+               AVRATIONAL_ARG(c->tracks[i - 1]->current_timestamp),
+               AVRATIONAL_ARG(minimum_timestamp),
+               AVRATIONAL_ARG(c->tracks[i - 1]->duration));
+
+        if (av_cmp_q(c->tracks[i - 1]->current_timestamp, minimum_timestamp) <= 0) {
+            track = c->tracks[i - 1];
+            minimum_timestamp = track->current_timestamp;
+        }
+    }
+
+    av_log(s,
+           AV_LOG_DEBUG,
+           "Found next track to read: %d (timestamp: %lf / %lf)\n",
+           track->index,
+           av_q2d(track->current_timestamp),
+           av_q2d(minimum_timestamp));
+    return track;
+}
+
+static IMFVirtualTrackResourcePlaybackCtx *get_resource_context_for_timestamp(AVFormatContext *s,
+                                                                              IMFVirtualTrackPlaybackCtx *track)
+{
+    AVRational edit_unit_duration = av_inv_q(track->resources[0].resource->base.edit_rate);
+    AVRational cumulated_duration = av_make_q(0, edit_unit_duration.den);
+
+    av_log(s,
+           AV_LOG_DEBUG,
+           "Looking for track %d resource for timestamp = %lf / %lf\n",
+           track->index,
+           av_q2d(track->current_timestamp),
+           av_q2d(track->duration));
+    for (uint32_t i = 0; i < track->resource_count; ++i) {
+        cumulated_duration = av_add_q(cumulated_duration,
+                                      av_make_q((int)track->resources[i].resource->base.duration
+                                                    * edit_unit_duration.num,
+                                                edit_unit_duration.den));
+
+        if (av_cmp_q(av_add_q(track->current_timestamp, edit_unit_duration), cumulated_duration) <= 0) {
+            av_log(s,
+                   AV_LOG_DEBUG,
+                   "Found resource %d in track %d to read for timestamp %lf "
+                   "(on cumulated=%lf): entry=%" PRIu32
+                   ", duration=%" PRIu32
+                   ", editrate=" AVRATIONAL_FORMAT
+                   " | edit_unit_duration=%lf\n",
+                   i,
+                   track->index,
+                   av_q2d(track->current_timestamp),
+                   av_q2d(cumulated_duration),
+                   track->resources[i].resource->base.entry_point,
+                   track->resources[i].resource->base.duration,
+                   AVRATIONAL_ARG(track->resources[i].resource->base.edit_rate),
+                   av_q2d(edit_unit_duration));
+
+            if (track->current_resource_index != i) {
+                av_log(s,
+                       AV_LOG_DEBUG,
+                       "Switch resource on track %d: re-open context\n",
+                       track->index);
+                if (open_track_resource_context(s, &(track->resources[i])) != 0)
+                    return NULL;
+                avformat_close_input(&(track->resources[track->current_resource_index].ctx));
+                track->current_resource_index = i;
+            }
+
+            return &(track->resources[track->current_resource_index]);
+        }
+    }
+    return NULL;
+}
+
+static int imf_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    IMFContext *c = s->priv_data;
+    IMFVirtualTrackResourcePlaybackCtx *resource_to_read = NULL;
+    AVRational edit_unit_duration;
+    int ret = 0;
+    IMFVirtualTrackPlaybackCtx *track;
+    FFStream *track_stream;
+
+    track = get_next_track_with_minimum_timestamp(s);
+
+    if (av_cmp_q(track->current_timestamp, track->duration) == 0)
+        return AVERROR_EOF;
+
+    resource_to_read = get_resource_context_for_timestamp(s, track);
+
+    if (!resource_to_read) {
+        edit_unit_duration
+            = av_inv_q(track->resources[track->current_resource_index].resource->base.edit_rate);
+
+        if (av_cmp_q(av_add_q(track->current_timestamp, edit_unit_duration), track->duration) > 0)
+            return AVERROR_EOF;
+
+        av_log(s, AV_LOG_ERROR, "Could not find IMF track resource to read\n");
+        return AVERROR_STREAM_NOT_FOUND;
+    }
+
+    while (!ff_check_interrupt(c->interrupt_callback) && !ret) {
+        ret = av_read_frame(resource_to_read->ctx, pkt);
+        av_log(s,
+               AV_LOG_DEBUG,
+               "Got packet: pts=%" PRId64
+               ", dts=%" PRId64
+               ", duration=%" PRId64
+               ", stream_index=%d, pos=%" PRId64
+               "\n",
+               pkt->pts,
+               pkt->dts,
+               pkt->duration,
+               pkt->stream_index,
+               pkt->pos);
+
+        track_stream = ffstream(s->streams[track->index]);
+        if (ret >= 0) {
+            /* Update packet info from track */
+            if (pkt->dts < track_stream->cur_dts && track->last_pts > 0)
+                pkt->dts = track_stream->cur_dts;
+
+            pkt->pts = track->last_pts;
+            pkt->dts = pkt->dts
+                - (int64_t)track->resources[track->current_resource_index].resource->base.entry_point;
+            pkt->stream_index = track->index;
+
+            /* Update track cursors */
+            track->current_timestamp
+                = av_add_q(track->current_timestamp,
+                           av_make_q((int)pkt->duration
+                                         * resource_to_read->ctx->streams[0]->time_base.num,
+                                     resource_to_read->ctx->streams[0]->time_base.den));
+            track->last_pts += pkt->duration;
+
+            return 0;
+        } else if (ret != AVERROR_EOF) {
+            av_log(s,
+                   AV_LOG_ERROR,
+                   "Could not get packet from track %d: %s\n",
+                   track->index,
+                   av_err2str(ret));
+            return ret;
+        }
+    }
+
+    return AVERROR_EOF;
+}
+
+static int imf_close(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+
+    av_log(s, AV_LOG_DEBUG, "Close IMF package\n");
+    av_dict_free(&c->avio_opts);
+    av_freep(&c->base_url);
+    imf_asset_locator_map_deinit(&c->asset_locator_map);
+    ff_imf_cpl_free(c->cpl);
+
+    for (uint32_t i = 0; i < c->track_count; ++i) {
+        imf_virtual_track_playback_context_deinit(c->tracks[i]);
+        av_freep(&c->tracks[i]);
+    }
+
+    av_freep(&c->tracks);
+
+    return 0;
+}
+
+static int imf_probe(const AVProbeData *p)
+{
+    if (!strstr(p->buf, "<CompositionPlaylist"))
+        return 0;
+
+    /* check for a ContentTitle element without including ContentTitleText,
+     * which is used by the D-Cinema CPL.
+     */
+    if (!strstr(p->buf, "ContentTitle>"))
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static const AVOption imf_options[] = {
+    {
+        .name        = "assetmaps",
+        .help        = "Comma-separated paths to ASSETMAP files."
+                       "If not specified, the `ASSETMAP.xml` file in the same "
+                       "directory as the CPL is used.",
+        .offset      = offsetof(IMFContext, asset_map_paths),
+        .type        = AV_OPT_TYPE_STRING,
+        .default_val = {.str = NULL},
+        .flags       = AV_OPT_FLAG_DECODING_PARAM,
+    },
+    {NULL},
+};
+
+static const AVClass imf_class = {
+    .class_name = "imf",
+    .item_name  = av_default_item_name,
+    .option     = imf_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+const AVInputFormat ff_imf_demuxer = {
+    .name           = "imf",
+    .long_name      = NULL_IF_CONFIG_SMALL("IMF (Interoperable Master Format)"),
+    .flags_internal = FF_FMT_INIT_CLEANUP,
+    .priv_class     = &imf_class,
+    .priv_data_size = sizeof(IMFContext),
+    .read_probe     = imf_probe,
+    .read_header    = imf_read_header,
+    .read_packet    = imf_read_packet,
+    .read_close     = imf_close,
+};
diff --git a/libavformat/version.h b/libavformat/version.h
index 9b90bbf156..917b9ffa5d 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -32,7 +32,7 @@
 // Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
 // Also please add any ticket numbers that you believe might be affected here
 #define LIBAVFORMAT_VERSION_MAJOR  59
-#define LIBAVFORMAT_VERSION_MINOR  11
+#define LIBAVFORMAT_VERSION_MINOR  12
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \