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authorMichael Niedermayer <michaelni@gmx.at>2011-04-15 04:37:17 +0200
committerMichael Niedermayer <michaelni@gmx.at>2011-04-15 04:50:06 +0200
commit85b21147594101ba2d8e7ea2cfa504c0d1baee5a (patch)
tree62927788e459965cea1ff4cd23c219fcf0410b0e
parent256c5b08bf09cb6403790d731cc1c771d8fb0e94 (diff)
parenta3a0af4fb1237bed0af75868073f9a63db8b1864 (diff)
downloadffmpeg-streaming-85b21147594101ba2d8e7ea2cfa504c0d1baee5a.zip
ffmpeg-streaming-85b21147594101ba2d8e7ea2cfa504c0d1baee5a.tar.gz
Merge commit 'a3a0af4fb1237bed0af75868073f9a63db8b1864'
* commit 'a3a0af4fb1237bed0af75868073f9a63db8b1864': avutil: make aes and sha api public handle malloc failures in ff_get_wav_header add xWMA demuxer mpegts: force the default timebase libavcodec: Bump micro after adding the dtx AVOptions Merged-by: Michael Niedermayer <michaelni@gmx.at>
-rw-r--r--Changelog1
-rw-r--r--doc/general.texi2
-rw-r--r--libavcodec/libvo-aacenc.c8
-rw-r--r--libavcodec/libvo-amrwbenc.c8
-rw-r--r--libavcodec/version.h2
-rw-r--r--libavformat/Makefile1
-rw-r--r--libavformat/allformats.c1
-rw-r--r--libavformat/asfdec.c4
-rw-r--r--libavformat/avidec.c5
-rw-r--r--libavformat/dxa.c5
-rw-r--r--libavformat/matroskadec.c5
-rw-r--r--libavformat/mpegtsenc.c1
-rw-r--r--libavformat/riff.c6
-rw-r--r--libavformat/riff.h2
-rw-r--r--libavformat/version.h2
-rw-r--r--libavformat/wav.c10
-rw-r--r--libavformat/wtv.c4
-rw-r--r--libavformat/xwma.c257
18 files changed, 305 insertions, 19 deletions
diff --git a/Changelog b/Changelog
index d56780b..a57c1e7 100644
--- a/Changelog
+++ b/Changelog
@@ -93,6 +93,7 @@ version <next>:
- fieldorder video filter added
- AAC encoding via libvo-aacenc
- AMR-WB encoding via libvo-amrwbenc
+- xWMA demuxer
version 0.6:
diff --git a/doc/general.texi b/doc/general.texi
index 5f75cef..303b5fb 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -259,6 +259,8 @@ library:
@tab Multimedia format used in Westwood Studios games.
@item Westwood Studios VQA @tab @tab X
@tab Multimedia format used in Westwood Studios games.
+@item xWMA @tab @tab X
+ @tab Microsoft audio container used by XAudio 2.
@item YUV4MPEG pipe @tab X @tab X
@item Psygnosis YOP @tab @tab X
@end multitable
diff --git a/libavcodec/libvo-aacenc.c b/libavcodec/libvo-aacenc.c
index f2a19a1..3475a5c 100644
--- a/libavcodec/libvo-aacenc.c
+++ b/libavcodec/libvo-aacenc.c
@@ -2,20 +2,20 @@
* AAC encoder wrapper
* Copyright (c) 2010 Martin Storsjo
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
diff --git a/libavcodec/libvo-amrwbenc.c b/libavcodec/libvo-amrwbenc.c
index d8a6099..7b9e66a 100644
--- a/libavcodec/libvo-amrwbenc.c
+++ b/libavcodec/libvo-amrwbenc.c
@@ -2,20 +2,20 @@
* AMR Audio encoder stub
* Copyright (c) 2003 the ffmpeg project
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
diff --git a/libavcodec/version.h b/libavcodec/version.h
index bad6509..0e2d766 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -22,7 +22,7 @@
#define LIBAVCODEC_VERSION_MAJOR 52
#define LIBAVCODEC_VERSION_MINOR 119
-#define LIBAVCODEC_VERSION_MICRO 0
+#define LIBAVCODEC_VERSION_MICRO 1
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \
diff --git a/libavformat/Makefile b/libavformat/Makefile
index c687d86..18f8c49 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -302,6 +302,7 @@ OBJS-$(CONFIG_WSVQA_DEMUXER) += westwood.o
OBJS-$(CONFIG_WTV_DEMUXER) += wtv.o asf.o asfdec.o mpegts.o riff.o
OBJS-$(CONFIG_WV_DEMUXER) += wv.o apetag.o
OBJS-$(CONFIG_XA_DEMUXER) += xa.o
+OBJS-$(CONFIG_XWMA_DEMUXER) += xwma.o riff.o
OBJS-$(CONFIG_YOP_DEMUXER) += yop.o
OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER) += yuv4mpeg.o
OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER) += yuv4mpeg.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index f0e98ed..4f28ab7 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -227,6 +227,7 @@ void av_register_all(void)
REGISTER_DEMUXER (WTV, wtv);
REGISTER_DEMUXER (WV, wv);
REGISTER_DEMUXER (XA, xa);
+ REGISTER_DEMUXER (XWMA, xwma);
REGISTER_DEMUXER (YOP, yop);
REGISTER_MUXDEMUX (YUV4MPEGPIPE, yuv4mpegpipe);
diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index dbb3f82..0ff992c 100644
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -280,7 +280,9 @@ static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
st->codec->codec_type = type;
if (type == AVMEDIA_TYPE_AUDIO) {
- ff_get_wav_header(pb, st->codec, type_specific_size);
+ int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
+ if (ret < 0)
+ return ret;
if (is_dvr_ms_audio) {
// codec_id and codec_tag are unreliable in dvr_ms
// files. Set them later by probing stream.
diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index ad0d098..7df3706 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -345,6 +345,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
int avih_width=0, avih_height=0;
int amv_file_format=0;
uint64_t list_end = 0;
+ int ret;
avi->stream_index= -1;
@@ -623,7 +624,9 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
// avio_skip(pb, size - 5 * 4);
break;
case AVMEDIA_TYPE_AUDIO:
- ff_get_wav_header(pb, st->codec, size);
+ ret = ff_get_wav_header(pb, st->codec, size);
+ if (ret < 0)
+ return ret;
ast->dshow_block_align= st->codec->block_align;
if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
diff --git a/libavformat/dxa.c b/libavformat/dxa.c
index cf93df7..15147a7 100644
--- a/libavformat/dxa.c
+++ b/libavformat/dxa.c
@@ -60,6 +60,7 @@ static int dxa_read_header(AVFormatContext *s, AVFormatParameters *ap)
int w, h;
int num, den;
int flags;
+ int ret;
tag = avio_rl32(pb);
if (tag != MKTAG('D', 'E', 'X', 'A'))
@@ -102,7 +103,9 @@ static int dxa_read_header(AVFormatContext *s, AVFormatParameters *ap)
ast = av_new_stream(s, 0);
if (!ast)
return -1;
- ff_get_wav_header(pb, ast->codec, fsize);
+ ret = ff_get_wav_header(pb, ast->codec, fsize);
+ if (ret < 0)
+ return ret;
// find 'data' chunk
while(avio_tell(pb) < c->vidpos && !url_feof(pb)){
tag = avio_rl32(pb);
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 55f62b8..ab67e11 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1332,9 +1332,12 @@ static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
} else if (!strcmp(track->codec_id, "A_MS/ACM")
&& track->codec_priv.size >= 14
&& track->codec_priv.data != NULL) {
+ int ret;
ffio_init_context(&b, track->codec_priv.data, track->codec_priv.size,
AVIO_RDONLY, NULL, NULL, NULL, NULL);
- ff_get_wav_header(&b, st->codec, track->codec_priv.size);
+ ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
+ if (ret < 0)
+ return ret;
codec_id = st->codec->codec_id;
extradata_offset = FFMIN(track->codec_priv.size, 18);
} else if (!strcmp(track->codec_id, "V_QUICKTIME")
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index 3461a33..ccaa2f8 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -479,6 +479,7 @@ static int mpegts_write_header(AVFormatContext *s)
/* assign pids to each stream */
for(i = 0;i < s->nb_streams; i++) {
st = s->streams[i];
+ av_set_pts_info(st, 33, 1, 90000);
ts_st = av_mallocz(sizeof(MpegTSWriteStream));
if (!ts_st)
goto fail;
diff --git a/libavformat/riff.c b/libavformat/riff.c
index a818fe5..5a40d9a 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -488,7 +488,7 @@ void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, const AVCodecTag *t
* WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
* an openended structure.
*/
-void ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
+int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
{
int id;
@@ -531,6 +531,8 @@ void ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
codec->extradata_size = cbSize;
if (cbSize > 0) {
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;
}
@@ -544,6 +546,8 @@ void ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
codec->channels = 0;
codec->sample_rate = 0;
}
+
+ return 0;
}
diff --git a/libavformat/riff.h b/libavformat/riff.h
index d5e1cdf..85caacb 100644
--- a/libavformat/riff.h
+++ b/libavformat/riff.h
@@ -45,7 +45,7 @@ int ff_get_bmp_header(AVIOContext *pb, AVStream *st);
void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf);
int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc);
enum CodecID ff_wav_codec_get_id(unsigned int tag, int bps);
-void ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size);
+int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size);
extern const AVCodecTag ff_codec_bmp_tags[];
extern const AVCodecTag ff_codec_wav_tags[];
diff --git a/libavformat/version.h b/libavformat/version.h
index e795263..eec52b2 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -24,7 +24,7 @@
#include "libavutil/avutil.h"
#define LIBAVFORMAT_VERSION_MAJOR 52
-#define LIBAVFORMAT_VERSION_MINOR 107
+#define LIBAVFORMAT_VERSION_MINOR 108
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
diff --git a/libavformat/wav.c b/libavformat/wav.c
index afdd701..588aff51 100644
--- a/libavformat/wav.c
+++ b/libavformat/wav.c
@@ -195,6 +195,7 @@ static int wav_read_header(AVFormatContext *s,
AVIOContext *pb = s->pb;
AVStream *st;
WAVContext *wav = s->priv_data;
+ int ret;
/* check RIFF header */
tag = avio_rl32(pb);
@@ -227,7 +228,9 @@ static int wav_read_header(AVFormatContext *s,
if (!st)
return AVERROR(ENOMEM);
- ff_get_wav_header(pb, st->codec, size);
+ ret = ff_get_wav_header(pb, st->codec, size);
+ if (ret < 0)
+ return ret;
st->need_parsing = AVSTREAM_PARSE_FULL;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
@@ -383,6 +386,7 @@ static int w64_read_header(AVFormatContext *s, AVFormatParameters *ap)
WAVContext *wav = s->priv_data;
AVStream *st;
uint8_t guid[16];
+ int ret;
avio_read(pb, guid, 16);
if (memcmp(guid, guid_riff, 16))
@@ -408,7 +412,9 @@ static int w64_read_header(AVFormatContext *s, AVFormatParameters *ap)
return AVERROR(ENOMEM);
/* subtract chunk header size - normal wav file doesn't count it */
- ff_get_wav_header(pb, st->codec, size - 24);
+ ret = ff_get_wav_header(pb, st->codec, size - 24);
+ if (ret < 0)
+ return ret;
avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
st->need_parsing = AVSTREAM_PARSE_FULL;
diff --git a/libavformat/wtv.c b/libavformat/wtv.c
index 756ba93..795ea39 100644
--- a/libavformat/wtv.c
+++ b/libavformat/wtv.c
@@ -645,7 +645,9 @@ static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
if (!st)
return NULL;
if (!ff_guidcmp(formattype, format_waveformatex)) {
- ff_get_wav_header(pb, st->codec, size);
+ int ret = ff_get_wav_header(pb, st->codec, size);
+ if (ret < 0)
+ return NULL;
} else {
if (ff_guidcmp(formattype, format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
diff --git a/libavformat/xwma.c b/libavformat/xwma.c
new file mode 100644
index 0000000..543d998
--- /dev/null
+++ b/libavformat/xwma.c
@@ -0,0 +1,257 @@
+/*
+ * xWMA demuxer
+ * Copyright (c) 2011 Max Horn
+ *
+ * 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 "avformat.h"
+#include "riff.h"
+
+/*
+ * Demuxer for xWMA, a Microsoft audio container used by XAudio 2.
+ */
+
+typedef struct {
+ int64_t data_end;
+} XWMAContext;
+
+static int xwma_probe(AVProbeData *p)
+{
+ if (!memcmp(p->buf, "RIFF", 4) && !memcmp(p->buf + 8, "XWMA", 4))
+ return AVPROBE_SCORE_MAX;
+ return 0;
+}
+
+static int xwma_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ int64_t size, av_uninit(data_size);
+ int ret;
+ uint32_t dpds_table_size = 0;
+ uint32_t *dpds_table = 0;
+ unsigned int tag;
+ AVIOContext *pb = s->pb;
+ AVStream *st;
+ XWMAContext *xwma = s->priv_data;
+ int i;
+
+ /* The following code is mostly copied from wav.c, with some
+ * minor alterations.
+ */
+
+ /* check RIFF header */
+ tag = avio_rl32(pb);
+ if (tag != MKTAG('R', 'I', 'F', 'F'))
+ return -1;
+ avio_rl32(pb); /* file size */
+ tag = avio_rl32(pb);
+ if (tag != MKTAG('X', 'W', 'M', 'A'))
+ return -1;
+
+ /* parse fmt header */
+ tag = avio_rl32(pb);
+ if (tag != MKTAG('f', 'm', 't', ' '))
+ return -1;
+ size = avio_rl32(pb);
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ ret = ff_get_wav_header(pb, st->codec, size);
+ if (ret < 0)
+ return ret;
+ st->need_parsing = AVSTREAM_PARSE_NONE;
+
+ /* All xWMA files I have seen contained WMAv2 data. If there are files
+ * using WMA Pro or some other codec, then we need to figure out the right
+ * extradata for that. Thus, ask the user for feedback, but try to go on
+ * anyway.
+ */
+ if (st->codec->codec_id != CODEC_ID_WMAV2) {
+ av_log(s, AV_LOG_WARNING, "unexpected codec (tag 0x04%x; id %d)\n",
+ st->codec->codec_tag, st->codec->codec_id);
+ av_log_ask_for_sample(s, NULL);
+ } else {
+ /* In all xWMA files I have seen, there is no extradata. But the WMA
+ * codecs require extradata, so we provide our own fake extradata.
+ *
+ * First, check that there really was no extradata in the header. If
+ * there was, then try to use, after asking the the user to provide a
+ * sample of this unusual file.
+ */
+ if (st->codec->extradata_size != 0) {
+ /* Surprise, surprise: We *did* get some extradata. No idea
+ * if it will work, but just go on and try it, after asking
+ * the user for a sample.
+ */
+ av_log(s, AV_LOG_WARNING, "unexpected extradata (%d bytes)\n",
+ st->codec->extradata_size);
+ av_log_ask_for_sample(s, NULL);
+ } else {
+ st->codec->extradata_size = 6;
+ st->codec->extradata = av_mallocz(6 + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!st->codec->extradata)
+ return AVERROR(ENOMEM);
+
+ /* setup extradata with our experimentally obtained value */
+ st->codec->extradata[4] = 31;
+ }
+ }
+
+ /* set the sample rate */
+ av_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+ /* parse the remaining RIFF chunks */
+ for (;;) {
+ if (pb->eof_reached)
+ return -1;
+ /* read next chunk tag */
+ tag = avio_rl32(pb);
+ size = avio_rl32(pb);
+ if (tag == MKTAG('d', 'a', 't', 'a')) {
+ /* We assume that the data chunk comes last. */
+ break;
+ } else if (tag == MKTAG('d','p','d','s')) {
+ /* Quoting the MSDN xWMA docs on the dpds chunk: "Contains the
+ * decoded packet cumulative data size array, each element is the
+ * number of bytes accumulated after the corresponding xWMA packet
+ * is decoded in order"
+ *
+ * Each packet has size equal to st->codec->block_align, which in
+ * all cases I saw so far was always 2230. Thus, we can use the
+ * dpds data to compute a seeking index.
+ */
+
+ /* Error out if there is more than one dpds chunk. */
+ if (dpds_table) {
+ av_log(s, AV_LOG_ERROR, "two dpds chunks present\n");
+ return -1;
+ }
+
+ /* Compute the number of entries in the dpds chunk. */
+ if (size & 3) { /* Size should be divisible by four */
+ av_log(s, AV_LOG_WARNING, "dpds chunk size "PRId64" not divisible by 4\n", size);
+ }
+ dpds_table_size = size / 4;
+ if (dpds_table_size == 0 || dpds_table_size >= INT_MAX / 4) {
+ av_log(s, AV_LOG_ERROR, "dpds chunk size "PRId64" invalid\n", size);
+ return -1;
+ }
+
+ /* Allocate some temporary storage to keep the dpds data around.
+ * for processing later on.
+ */
+ dpds_table = av_malloc(dpds_table_size * sizeof(uint32_t));
+ if (!dpds_table) {
+ return AVERROR(ENOMEM);
+ }
+
+ for (i = 0; i < dpds_table_size; ++i) {
+ dpds_table[i] = avio_rl32(pb);
+ size -= 4;
+ }
+ }
+ avio_skip(pb, size);
+ }
+
+ /* Determine overall data length */
+ if (size < 0)
+ return -1;
+ if (!size) {
+ xwma->data_end = INT64_MAX;
+ } else
+ xwma->data_end = avio_tell(pb) + size;
+
+
+ if (dpds_table && dpds_table_size) {
+ int64_t cur_pos;
+ const uint32_t bytes_per_sample
+ = (st->codec->channels * st->codec->bits_per_coded_sample) >> 3;
+
+ /* Estimate the duration from the total number of output bytes. */
+ const uint64_t total_decoded_bytes = dpds_table[dpds_table_size - 1];
+ st->duration = total_decoded_bytes / bytes_per_sample;
+
+ /* Use the dpds data to build a seek table. We can only do this after
+ * we know the offset to the data chunk, as we need that to determine
+ * the actual offset to each input block.
+ * Note: If we allowed ourselves to assume that the data chunk always
+ * follows immediately after the dpds block, we could of course guess
+ * the data block's start offset already while reading the dpds chunk.
+ * I decided against that, just in case other chunks ever are
+ * discovered.
+ */
+ cur_pos = avio_tell(pb);
+ for (i = 0; i < dpds_table_size; ++i) {
+ /* From the number of output bytes that would accumulate in the
+ * output buffer after decoding the first (i+1) packets, we compute
+ * an offset / timestamp pair.
+ */
+ av_add_index_entry(st,
+ cur_pos + (i+1) * st->codec->block_align, /* pos */
+ dpds_table[i] / bytes_per_sample, /* timestamp */
+ st->codec->block_align, /* size */
+ 0, /* duration */
+ AVINDEX_KEYFRAME);
+ }
+ } else if (st->codec->bit_rate) {
+ /* No dpds chunk was present (or only an empty one), so estimate
+ * the total duration using the average bits per sample and the
+ * total data length.
+ */
+ st->duration = (size<<3) * st->codec->sample_rate / st->codec->bit_rate;
+ }
+
+ av_free(dpds_table);
+
+ return 0;
+}
+
+static int xwma_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ int ret, size;
+ int64_t left;
+ AVStream *st;
+ XWMAContext *xwma = s->priv_data;
+
+ st = s->streams[0];
+
+ left = xwma->data_end - avio_tell(s->pb);
+ if (left <= 0) {
+ return AVERROR_EOF;
+ }
+
+ /* read a single block; the default block size is 2230. */
+ size = (st->codec->block_align > 1) ? st->codec->block_align : 2230;
+ size = FFMIN(size, left);
+
+ ret = av_get_packet(s->pb, pkt, size);
+ if (ret < 0)
+ return ret;
+
+ pkt->stream_index = 0;
+ return ret;
+}
+
+AVInputFormat ff_xwma_demuxer = {
+ "xwma",
+ NULL_IF_CONFIG_SMALL("Microsoft xWMA"),
+ sizeof(XWMAContext),
+ xwma_probe,
+ xwma_read_header,
+ xwma_read_packet,
+};
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