flac: move picture parsing code in a separate file

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

4 files changed, 183 insertions, 130 deletions

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 12d3d6e793..9ff5a3c21d 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -116,6 +116,7 @@ OBJS-$(CONFIG_FFMETADATA_MUXER)          += ffmetaenc.o
 OBJS-$(CONFIG_FILMSTRIP_DEMUXER)         += filmstripdec.o
 OBJS-$(CONFIG_FILMSTRIP_MUXER)           += filmstripenc.o
 OBJS-$(CONFIG_FLAC_DEMUXER)              += flacdec.o rawdec.o \
+                                            flac_picture.o   \
                                             oggparsevorbis.o \
                                             vorbiscomment.o
 OBJS-$(CONFIG_FLAC_MUXER)                += flacenc.o flacenc_header.o \
diff --git a/libavformat/flac_picture.c b/libavformat/flac_picture.c
new file mode 100644
index 0000000000..69d27244ff
--- /dev/null
+++ b/libavformat/flac_picture.c
@@ -0,0 +1,152 @@
+/*
+ * Raw FLAC picture parser
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avformat.h"
+#include "flac_picture.h"
+#include "id3v2.h"
+#include "internal.h"
+
+int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
+{
+    const CodecMime *mime = ff_id3v2_mime_tags;
+    enum AVCodecID id = AV_CODEC_ID_NONE;
+    AVBufferRef *data = NULL;
+    uint8_t mimetype[64], *desc = NULL;
+    AVIOContext *pb = NULL;
+    AVStream *st;
+    int type, width, height;
+    int len, ret = 0;
+
+    pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
+    if (!pb)
+        return AVERROR(ENOMEM);
+
+    /* read the picture type */
+    type = avio_rb32(pb);
+    if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
+        av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
+        if (s->error_recognition & AV_EF_EXPLODE) {
+            ret = AVERROR_INVALIDDATA;
+            goto fail;
+        }
+        type = 0;
+    }
+
+    /* picture mimetype */
+    len = avio_rb32(pb);
+    if (len <= 0 ||
+        avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
+        av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
+               "picture.\n");
+        if (s->error_recognition & AV_EF_EXPLODE)
+            ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+    mimetype[len] = 0;
+
+    while (mime->id != AV_CODEC_ID_NONE) {
+        if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
+            id = mime->id;
+            break;
+        }
+        mime++;
+    }
+    if (id == AV_CODEC_ID_NONE) {
+        av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
+               mimetype);
+        if (s->error_recognition & AV_EF_EXPLODE)
+            ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    /* picture description */
+    len = avio_rb32(pb);
+    if (len > 0) {
+        if (!(desc = av_malloc(len + 1))) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        if (avio_read(pb, desc, len) != len) {
+            av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
+            if (s->error_recognition & AV_EF_EXPLODE)
+                ret = AVERROR(EIO);
+            goto fail;
+        }
+        desc[len] = 0;
+    }
+
+    /* picture metadata */
+    width  = avio_rb32(pb);
+    height = avio_rb32(pb);
+    avio_skip(pb, 8);
+
+    /* picture data */
+    len = avio_rb32(pb);
+    if (len <= 0) {
+        av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
+        if (s->error_recognition & AV_EF_EXPLODE)
+            ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+    if (!(data = av_buffer_alloc(len))) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+    if (avio_read(pb, data->data, len) != len) {
+        av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
+        if (s->error_recognition & AV_EF_EXPLODE)
+            ret = AVERROR(EIO);
+        goto fail;
+    }
+
+    st = avformat_new_stream(s, NULL);
+    if (!st) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    av_init_packet(&st->attached_pic);
+    st->attached_pic.buf          = data;
+    st->attached_pic.data         = data->data;
+    st->attached_pic.size         = len;
+    st->attached_pic.stream_index = st->index;
+    st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
+
+    st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;
+    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id   = id;
+    st->codec->width      = width;
+    st->codec->height     = height;
+    av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
+    if (desc)
+        av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
+
+    av_freep(&pb);
+
+    return 0;
+
+fail:
+    av_buffer_unref(&data);
+    av_freep(&desc);
+    av_freep(&pb);
+
+    return ret;
+}
diff --git a/libavformat/flac_picture.h b/libavformat/flac_picture.h
new file mode 100644
index 0000000000..c7005829bc
--- /dev/null
+++ b/libavformat/flac_picture.h
@@ -0,0 +1,28 @@
+/*
+ * Raw FLAC picture parser
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_FLAC_PICTURE_H
+#define AVFORMAT_FLAC_PICTURE_H
+
+#include "avformat.h"
+
+int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size);
+
+#endif /* AVFORMAT_FLAC_PICTURE_H */
diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c
index 9737095bbb..ecbb7ec0ef 100644
--- a/libavformat/flacdec.c
+++ b/libavformat/flacdec.c
@@ -21,141 +21,13 @@
 
 #include "libavcodec/flac.h"
 #include "avformat.h"
-#include "id3v2.h"
+#include "flac_picture.h"
 #include "internal.h"
 #include "rawdec.h"
 #include "oggdec.h"
 #include "vorbiscomment.h"
 #include "libavcodec/bytestream.h"
 
-static int parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
-{
-    const CodecMime *mime = ff_id3v2_mime_tags;
-    enum  AVCodecID      id = AV_CODEC_ID_NONE;
-    AVBufferRef *data = NULL;
-    uint8_t mimetype[64], *desc = NULL;
-    AVIOContext *pb = NULL;
-    AVStream *st;
-    int type, width, height;
-    int len, ret = 0;
-
-    pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
-    if (!pb)
-        return AVERROR(ENOMEM);
-
-    /* read the picture type */
-    type      = avio_rb32(pb);
-    if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
-        av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
-        if (s->error_recognition & AV_EF_EXPLODE) {
-            ret = AVERROR_INVALIDDATA;
-            goto fail;
-        }
-        type = 0;
-    }
-
-    /* picture mimetype */
-    len  = avio_rb32(pb);
-    if (len <= 0 ||
-        avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
-        av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
-               "picture.\n");
-        if (s->error_recognition & AV_EF_EXPLODE)
-            ret = AVERROR_INVALIDDATA;
-        goto fail;
-    }
-    mimetype[len] = 0;
-
-    while (mime->id != AV_CODEC_ID_NONE) {
-        if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
-            id = mime->id;
-            break;
-        }
-        mime++;
-    }
-    if (id == AV_CODEC_ID_NONE) {
-        av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
-               mimetype);
-        if (s->error_recognition & AV_EF_EXPLODE)
-            ret = AVERROR_INVALIDDATA;
-        goto fail;
-    }
-
-    /* picture description */
-    len = avio_rb32(pb);
-    if (len > 0) {
-        if (!(desc = av_malloc(len + 1))) {
-            ret = AVERROR(ENOMEM);
-            goto fail;
-        }
-
-        if (avio_read(pb, desc, len) != len) {
-            av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
-            if (s->error_recognition & AV_EF_EXPLODE)
-                ret = AVERROR(EIO);
-            goto fail;
-        }
-        desc[len] = 0;
-    }
-
-    /* picture metadata */
-    width  = avio_rb32(pb);
-    height = avio_rb32(pb);
-    avio_skip(pb, 8);
-
-    /* picture data */
-    len = avio_rb32(pb);
-    if (len <= 0) {
-        av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
-        if (s->error_recognition & AV_EF_EXPLODE)
-            ret = AVERROR_INVALIDDATA;
-        goto fail;
-    }
-    if (!(data = av_buffer_alloc(len))) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-    if (avio_read(pb, data->data, len) != len) {
-        av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
-        if (s->error_recognition & AV_EF_EXPLODE)
-            ret = AVERROR(EIO);
-        goto fail;
-    }
-
-    st = avformat_new_stream(s, NULL);
-    if (!st) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-
-    av_init_packet(&st->attached_pic);
-    st->attached_pic.buf          = data;
-    st->attached_pic.data         = data->data;
-    st->attached_pic.size         = len;
-    st->attached_pic.stream_index = st->index;
-    st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
-
-    st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;
-    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
-    st->codec->codec_id   = id;
-    st->codec->width      = width;
-    st->codec->height     = height;
-    av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
-    if (desc)
-        av_dict_set(&st->metadata, "title",   desc, AV_DICT_DONT_STRDUP_VAL);
-
-    av_freep(&pb);
-
-    return 0;
-
-fail:
-    av_buffer_unref(&data);
-    av_freep(&desc);
-    av_freep(&pb);
-    return ret;
-
-}
-
 static int flac_read_header(AVFormatContext *s)
 {
     int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
@@ -252,7 +124,7 @@ static int flac_read_header(AVFormatContext *s)
                 avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
             }
         } else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
-            ret = parse_picture(s, buffer, metadata_size);
+            ret = ff_flac_parse_picture(s, buffer, metadata_size);
             av_freep(&buffer);
             if (ret < 0) {
                 av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");