Merge commit '255d9c570e117f0fcb8e51fa2c5996f3c4b2052b'

* commit '255d9c570e117f0fcb8e51fa2c5996f3c4b2052b':
  riff: Move demuxing code to a separate file.

Conflicts:
	configure
	libavformat/riff.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

4 files changed, 261 insertions, 223 deletions

diff --git a/configure b/configure
index 467ab16ce5..53972de6a3 100755
--- a/configure
+++ b/configure
@@ -1574,6 +1574,7 @@ CONFIG_EXTRA="
     mpegvideoenc
     nettle
     rangecoder
+    riffdec
     riffenc
     rtpdec
     rtpenc_chain
@@ -2025,13 +2026,18 @@ libutvideo_encoder_deps="libutvideo"
 
 # demuxers / muxers
 ac3_demuxer_select="ac3_parser"
+asf_demuxer_select="riffdec"
 asf_muxer_select="riffenc"
 asf_stream_muxer_select="asf_muxer"
+avi_demuxer_select="riffdec"
 avi_muxer_select="riffenc"
 avisynth_demuxer_deps="avisynth"
+avisynth_demuxer_select="riffdec"
+caf_demuxer_select="riffdec"
 dirac_demuxer_select="dirac_parser"
 dts_demuxer_select="dca_parser"
 dtshd_demuxer_select="dca_parser"
+dxa_demuxer_select="riffdec"
 eac3_demuxer_select="ac3_parser"
 f4v_muxer_select="mov_muxer"
 flac_demuxer_select="flac_parser"
@@ -2040,9 +2046,11 @@ ismv_muxer_select="mov_muxer"
 libnut_demuxer_deps="libnut"
 libnut_muxer_deps="libnut"
 matroska_audio_muxer_select="matroska_muxer"
+matroska_demuxer_select="riffdec"
 matroska_demuxer_suggest="bzlib lzo zlib"
 matroska_muxer_select="riffenc"
 mmf_muxer_select="riffenc"
+mov_demuxer_select="riffdec"
 mov_demuxer_suggest="zlib"
 mov_muxer_select="riffenc rtpenc_chain"
 mp3_demuxer_select="mpegaudio_parser"
@@ -2051,6 +2059,7 @@ mpegts_muxer_select="adts_muxer latm_muxer"
 mpegtsraw_demuxer_select="mpegts_demuxer"
 mxf_d10_muxer_select="mxf_muxer"
 nut_muxer_select="riffenc"
+nuv_demuxer_select="riffdec"
 ogg_demuxer_select="golomb"
 psp_muxer_select="mov_muxer"
 rtp_demuxer_select="sdp_demuxer"
@@ -2068,8 +2077,12 @@ tgp_muxer_select="mov_muxer"
 vobsub_demuxer_select="mpegps_demuxer"
 w64_demuxer_deps="wav_demuxer"
 w64_muxer_deps="wav_muxer"
+wav_demuxer_select="riffdec"
 wav_muxer_select="riffenc"
 webm_muxer_select="riffenc"
+wtv_demuxer_select="riffdec"
+xmv_demuxer_select="riffdec"
+xwma_demuxer_select="riffdec"
 
 # indevs / outdevs
 alsa_indev_deps="alsa_asoundlib_h snd_pcm_htimestamp"
diff --git a/libavformat/Makefile b/libavformat/Makefile
index b0e42b3b5a..b8872b336b 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -25,6 +25,7 @@ OBJS = allformats.o         \
        utils.o              \
 
 OBJS-$(CONFIG_NETWORK)                   += network.o
+OBJS-$(CONFIG_RIFFDEC)                   += riffdec.o
 OBJS-$(CONFIG_RIFFENC)                   += riffenc.o
 OBJS-$(CONFIG_RTPDEC)                    += rdt.o                       \
                                             rtp.o                       \
diff --git a/libavformat/riff.c b/libavformat/riff.c
index 0896d22c5c..84d97ed5c2 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -20,13 +20,9 @@
  */
 
 #include "libavutil/error.h"
-#include "libavutil/log.h"
 #include "libavcodec/avcodec.h"
 #include "avformat.h"
-#include "avio_internal.h"
 #include "riff.h"
-#include "libavcodec/bytestream.h"
-#include "libavutil/avassert.h"
 
 /* Note: When encoding, the first matching tag is used, so order is
  * important if multiple tags are possible for a given codec.
@@ -422,14 +418,6 @@ const AVCodecTag ff_codec_wav_tags[] = {
     { AV_CODEC_ID_NONE,      0 },
 };
 
-const AVCodecGuid ff_codec_wav_guids[] = {
-    { AV_CODEC_ID_AC3,      { 0x2C, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
-    { AV_CODEC_ID_ATRAC3P,  { 0xBF, 0xAA, 0x23, 0xE9, 0x58, 0xCB, 0x71, 0x44, 0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62 } },
-    { AV_CODEC_ID_EAC3,     { 0xAF, 0x87, 0xFB, 0xA7, 0x02, 0x2D, 0xFB, 0x42, 0xA4, 0xD4, 0x05, 0xCD, 0x93, 0x84, 0x3B, 0xDD } },
-    { AV_CODEC_ID_MP2,      { 0x2B, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
-    { AV_CODEC_ID_NONE }
-};
-
 const AVMetadataConv ff_riff_info_conv[] = {
     { "IART", "artist"     },
     { "ICMT", "comment"    },
@@ -447,22 +435,6 @@ const AVMetadataConv ff_riff_info_conv[] = {
     { 0 },
 };
 
-void ff_get_guid(AVIOContext *s, ff_asf_guid *g)
-{
-    av_assert0(sizeof(*g) == 16); //compiler will optimize this out
-    if (avio_read(s, *g, sizeof(*g)) < (int)sizeof(*g))
-        memset(*g, 0, sizeof(*g));
-}
-
-enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
-{
-    int i;
-    for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
-        if (!ff_guidcmp(guids[i].guid, guid))
-            return guids[i].id;
-    return AV_CODEC_ID_NONE;
-}
-
 const struct AVCodecTag *avformat_get_riff_video_tags(void)
 {
     return ff_codec_bmp_tags;
@@ -472,198 +444,3 @@ const struct AVCodecTag *avformat_get_riff_audio_tags(void)
 {
     return ff_codec_wav_tags;
 }
-
-#if CONFIG_DEMUXERS
-/* We could be given one of the three possible structures here:
- * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
- * is an expansion of the previous one with the fields added
- * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
- * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
- * an openended structure.
- */
-
-static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c)
-{
-    ff_asf_guid subformat;
-    int bps = avio_rl16(pb);
-    if (bps)
-        c->bits_per_coded_sample = bps;
-
-    c->channel_layout        = avio_rl32(pb); /* dwChannelMask */
-
-    ff_get_guid(pb, &subformat);
-    if (!memcmp(subformat + 4,
-                (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
-        c->codec_tag = AV_RL32(subformat);
-        c->codec_id  = ff_wav_codec_get_id(c->codec_tag,
-                                           c->bits_per_coded_sample);
-    } else {
-        c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
-        if (!c->codec_id)
-            av_log(c, AV_LOG_WARNING,
-                   "unknown subformat:"FF_PRI_GUID"\n",
-                   FF_ARG_GUID(subformat));
-    }
-}
-
-int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
-{
-    int id;
-
-    id                 = avio_rl16(pb);
-    codec->codec_type  = AVMEDIA_TYPE_AUDIO;
-    codec->channels    = avio_rl16(pb);
-    codec->sample_rate = avio_rl32(pb);
-    codec->bit_rate    = avio_rl32(pb) * 8;
-    codec->block_align = avio_rl16(pb);
-    if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
-        codec->bits_per_coded_sample = 8;
-    } else
-        codec->bits_per_coded_sample = avio_rl16(pb);
-    if (id == 0xFFFE) {
-        codec->codec_tag = 0;
-    } else {
-        codec->codec_tag = id;
-        codec->codec_id  = ff_wav_codec_get_id(id,
-                                               codec->bits_per_coded_sample);
-    }
-    if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
-        int cbSize = avio_rl16(pb); /* cbSize */
-        size  -= 18;
-        cbSize = FFMIN(size, cbSize);
-        if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
-            parse_waveformatex(pb, codec);
-            cbSize -= 22;
-            size   -= 22;
-        }
-        codec->extradata_size = cbSize;
-        if (cbSize > 0) {
-            av_free(codec->extradata);
-            codec->extradata = av_mallocz(codec->extradata_size +
-                                          FF_INPUT_BUFFER_PADDING_SIZE);
-            if (!codec->extradata)
-                return AVERROR(ENOMEM);
-            avio_read(pb, codec->extradata, codec->extradata_size);
-            size -= cbSize;
-        }
-
-        /* It is possible for the chunk to contain garbage at the end */
-        if (size > 0)
-            avio_skip(pb, size);
-    }
-    if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
-        /* Channels and sample_rate values are those prior to applying SBR
-         * and/or PS. */
-        codec->channels    = 0;
-        codec->sample_rate = 0;
-    }
-    /* override bits_per_coded_sample for G.726 */
-    if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate)
-        codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
-
-    return 0;
-}
-
-enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
-{
-    enum AVCodecID id;
-    id = ff_codec_get_id(ff_codec_wav_tags, tag);
-    if (id <= 0)
-        return id;
-
-    if (id == AV_CODEC_ID_PCM_S16LE)
-        id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
-    else if (id == AV_CODEC_ID_PCM_F32LE)
-        id = ff_get_pcm_codec_id(bps, 1, 0,  0);
-
-    if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
-        id = AV_CODEC_ID_PCM_ZORK;
-    return id;
-}
-
-int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
-{
-    int tag1;
-    if(esize) *esize  = avio_rl32(pb);
-    else                avio_rl32(pb);
-    st->codec->width  = avio_rl32(pb);
-    st->codec->height = (int32_t)avio_rl32(pb);
-    avio_rl16(pb); /* planes */
-    st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
-    tag1                             = avio_rl32(pb);
-    avio_rl32(pb); /* ImageSize */
-    avio_rl32(pb); /* XPelsPerMeter */
-    avio_rl32(pb); /* YPelsPerMeter */
-    avio_rl32(pb); /* ClrUsed */
-    avio_rl32(pb); /* ClrImportant */
-    return tag1;
-}
-
-int ff_read_riff_info(AVFormatContext *s, int64_t size)
-{
-    int64_t start, end, cur;
-    AVIOContext *pb = s->pb;
-
-    start = avio_tell(pb);
-    end   = start + size;
-
-    while ((cur = avio_tell(pb)) >= 0 &&
-           cur <= end - 8 /* = tag + size */) {
-        uint32_t chunk_code;
-        int64_t chunk_size;
-        char key[5] = { 0 };
-        char *value;
-
-        chunk_code = avio_rl32(pb);
-        chunk_size = avio_rl32(pb);
-        if (url_feof(pb)) {
-            if (chunk_code || chunk_size) {
-                av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
-                return AVERROR_INVALIDDATA;
-            }
-            return AVERROR_EOF;
-        }
-        if (chunk_size > end ||
-            end - chunk_size < cur ||
-            chunk_size == UINT_MAX) {
-            avio_seek(pb, -9, SEEK_CUR);
-            chunk_code = avio_rl32(pb);
-            chunk_size = avio_rl32(pb);
-            if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
-                av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
-                return AVERROR_INVALIDDATA;
-            }
-        }
-
-        chunk_size += (chunk_size & 1);
-
-        if (!chunk_code) {
-            if (chunk_size)
-                avio_skip(pb, chunk_size);
-            else if (pb->eof_reached) {
-                av_log(s, AV_LOG_WARNING, "truncated file\n");
-                return AVERROR_EOF;
-            }
-            continue;
-        }
-
-        value = av_mallocz(chunk_size + 1);
-        if (!value) {
-            av_log(s, AV_LOG_ERROR,
-                   "out of memory, unable to read INFO tag\n");
-            return AVERROR(ENOMEM);
-        }
-
-        AV_WL32(key, chunk_code);
-
-        if (avio_read(pb, value, chunk_size) != chunk_size) {
-            av_log(s, AV_LOG_WARNING,
-                   "premature end of file while reading INFO tag\n");
-        }
-
-        av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
-    }
-
-    return 0;
-}
-#endif /* CONFIG_DEMUXERS */
diff --git a/libavformat/riffdec.c b/libavformat/riffdec.c
new file mode 100644
index 0000000000..973f3fada9
--- /dev/null
+++ b/libavformat/riffdec.c
@@ -0,0 +1,247 @@
+/*
+ * RIFF demuxing functions and data
+ * Copyright (c) 2000 Fabrice Bellard
+ *
+ * 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
+ */
+
+#include "libavutil/dict.h"
+#include "libavutil/error.h"
+#include "libavutil/log.h"
+#include "libavutil/mathematics.h"
+#include "libavcodec/avcodec.h"
+#include "libavcodec/bytestream.h"
+#include "avformat.h"
+#include "avio_internal.h"
+#include "riff.h"
+
+const AVCodecGuid ff_codec_wav_guids[] = {
+    { AV_CODEC_ID_AC3,      { 0x2C, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
+    { AV_CODEC_ID_ATRAC3P,  { 0xBF, 0xAA, 0x23, 0xE9, 0x58, 0xCB, 0x71, 0x44, 0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62 } },
+    { AV_CODEC_ID_EAC3,     { 0xAF, 0x87, 0xFB, 0xA7, 0x02, 0x2D, 0xFB, 0x42, 0xA4, 0xD4, 0x05, 0xCD, 0x93, 0x84, 0x3B, 0xDD } },
+    { AV_CODEC_ID_MP2,      { 0x2B, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
+    { AV_CODEC_ID_NONE }
+};
+
+void ff_get_guid(AVIOContext *s, ff_asf_guid *g)
+{
+    av_assert0(sizeof(*g) == 16); //compiler will optimize this out
+    if (avio_read(s, *g, sizeof(*g)) < (int)sizeof(*g))
+        memset(*g, 0, sizeof(*g));
+}
+
+enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
+{
+    int i;
+    for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
+        if (!ff_guidcmp(guids[i].guid, guid))
+            return guids[i].id;
+    return AV_CODEC_ID_NONE;
+}
+
+/* We could be given one of the three possible structures here:
+ * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
+ * is an expansion of the previous one with the fields added
+ * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
+ * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
+ * an openended structure.
+ */
+
+static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c)
+{
+    ff_asf_guid subformat;
+    int bps = avio_rl16(pb);
+    if (bps)
+        c->bits_per_coded_sample = bps;
+
+    c->channel_layout        = avio_rl32(pb); /* dwChannelMask */
+
+    ff_get_guid(pb, &subformat);
+    if (!memcmp(subformat + 4,
+                (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
+        c->codec_tag = AV_RL32(subformat);
+        c->codec_id  = ff_wav_codec_get_id(c->codec_tag,
+                                           c->bits_per_coded_sample);
+    } else {
+        c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
+        if (!c->codec_id)
+            av_log(c, AV_LOG_WARNING,
+                   "unknown subformat:"FF_PRI_GUID"\n",
+                   FF_ARG_GUID(subformat));
+    }
+}
+
+int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
+{
+    int id;
+
+    id                 = avio_rl16(pb);
+    codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    codec->channels    = avio_rl16(pb);
+    codec->sample_rate = avio_rl32(pb);
+    codec->bit_rate    = avio_rl32(pb) * 8;
+    codec->block_align = avio_rl16(pb);
+    if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
+        codec->bits_per_coded_sample = 8;
+    } else
+        codec->bits_per_coded_sample = avio_rl16(pb);
+    if (id == 0xFFFE) {
+        codec->codec_tag = 0;
+    } else {
+        codec->codec_tag = id;
+        codec->codec_id  = ff_wav_codec_get_id(id,
+                                               codec->bits_per_coded_sample);
+    }
+    if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
+        int cbSize = avio_rl16(pb); /* cbSize */
+        size  -= 18;
+        cbSize = FFMIN(size, cbSize);
+        if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
+            parse_waveformatex(pb, codec);
+            cbSize -= 22;
+            size   -= 22;
+        }
+        codec->extradata_size = cbSize;
+        if (cbSize > 0) {
+            av_free(codec->extradata);
+            codec->extradata = av_mallocz(codec->extradata_size +
+                                          FF_INPUT_BUFFER_PADDING_SIZE);
+            if (!codec->extradata)
+                return AVERROR(ENOMEM);
+            avio_read(pb, codec->extradata, codec->extradata_size);
+            size -= cbSize;
+        }
+
+        /* It is possible for the chunk to contain garbage at the end */
+        if (size > 0)
+            avio_skip(pb, size);
+    }
+    if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
+        /* Channels and sample_rate values are those prior to applying SBR
+         * and/or PS. */
+        codec->channels    = 0;
+        codec->sample_rate = 0;
+    }
+    /* override bits_per_coded_sample for G.726 */
+    if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate)
+        codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
+
+    return 0;
+}
+
+enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
+{
+    enum AVCodecID id;
+    id = ff_codec_get_id(ff_codec_wav_tags, tag);
+    if (id <= 0)
+        return id;
+
+    if (id == AV_CODEC_ID_PCM_S16LE)
+        id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
+    else if (id == AV_CODEC_ID_PCM_F32LE)
+        id = ff_get_pcm_codec_id(bps, 1, 0,  0);
+
+    if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
+        id = AV_CODEC_ID_PCM_ZORK;
+    return id;
+}
+
+int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
+{
+    int tag1;
+    if(esize) *esize  = avio_rl32(pb);
+    else                avio_rl32(pb);
+    st->codec->width  = avio_rl32(pb);
+    st->codec->height = (int32_t)avio_rl32(pb);
+    avio_rl16(pb); /* planes */
+    st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
+    tag1                             = avio_rl32(pb);
+    avio_rl32(pb); /* ImageSize */
+    avio_rl32(pb); /* XPelsPerMeter */
+    avio_rl32(pb); /* YPelsPerMeter */
+    avio_rl32(pb); /* ClrUsed */
+    avio_rl32(pb); /* ClrImportant */
+    return tag1;
+}
+
+int ff_read_riff_info(AVFormatContext *s, int64_t size)
+{
+    int64_t start, end, cur;
+    AVIOContext *pb = s->pb;
+
+    start = avio_tell(pb);
+    end   = start + size;
+
+    while ((cur = avio_tell(pb)) >= 0 &&
+           cur <= end - 8 /* = tag + size */) {
+        uint32_t chunk_code;
+        int64_t chunk_size;
+        char key[5] = { 0 };
+        char *value;
+
+        chunk_code = avio_rl32(pb);
+        chunk_size = avio_rl32(pb);
+        if (url_feof(pb)) {
+            if (chunk_code || chunk_size) {
+                av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
+                return AVERROR_INVALIDDATA;
+            }
+            return AVERROR_EOF;
+        }
+        if (chunk_size > end ||
+            end - chunk_size < cur ||
+            chunk_size == UINT_MAX) {
+            avio_seek(pb, -9, SEEK_CUR);
+            chunk_code = avio_rl32(pb);
+            chunk_size = avio_rl32(pb);
+            if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
+                av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
+                return AVERROR_INVALIDDATA;
+            }
+        }
+
+        chunk_size += (chunk_size & 1);
+
+        if (!chunk_code) {
+            if (chunk_size)
+                avio_skip(pb, chunk_size);
+            else if (pb->eof_reached) {
+                av_log(s, AV_LOG_WARNING, "truncated file\n");
+                return AVERROR_EOF;
+            }
+            continue;
+        }
+
+        value = av_mallocz(chunk_size + 1);
+        if (!value) {
+            av_log(s, AV_LOG_ERROR,
+                   "out of memory, unable to read INFO tag\n");
+            return AVERROR(ENOMEM);
+        }
+
+        AV_WL32(key, chunk_code);
+
+        if (avio_read(pb, value, chunk_size) != chunk_size) {
+            av_log(s, AV_LOG_WARNING,
+                   "premature end of file while reading INFO tag\n");
+        }
+
+        av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
+    }
+
+    return 0;
+}