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librempeg/libavformat/wavdec.c
Michael Niedermayer 707bd42da2 avformat/wavdec: Check if there are 16 bytes before testing them 
Fixes: use-of-uninitialized-value
Fixes: 70839/clusterfuzz-testcase-minimized-ffmpeg_dem_W64_fuzzer-5212907590189056

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2024-08-15 10:48:30 +02:00

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/*
* WAV demuxer
* Copyright (c) 2001, 2002 Fabrice Bellard
*
* Sony Wave64 demuxer
* RF64 demuxer
* Copyright (c) 2009 Daniel Verkamp
*
* BW64 demuxer
*
* 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 <stdint.h>
#include "config_components.h"
#include "libavutil/avassert.h"
#include "libavutil/dict.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/mathematics.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavcodec/internal.h"
#include "avformat.h"
#include "avio.h"
#include "avio_internal.h"
#include "demux.h"
#include "id3v2.h"
#include "internal.h"
#include "metadata.h"
#include "pcm.h"
#include "riff.h"
#include "w64.h"
#include "spdif.h"
typedef struct WAVDemuxContext {
const AVClass *class;
int64_t data_end;
int w64;
AVStream *vst;
int64_t smv_data_ofs;
int smv_block_size;
int smv_frames_per_jpeg;
int smv_block;
int smv_last_stream;
int smv_eof;
int audio_eof;
int ignore_length;
int max_size;
int spdif;
int smv_given_first;
int unaligned; // e.g. if an odd number of bytes ID3 tag was prepended
int rifx; // RIFX: integer byte order for parameters is big endian
} WAVDemuxContext;
#define OFFSET(x) offsetof(WAVDemuxContext, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption demux_options[] = {
#define W64_DEMUXER_OPTIONS_OFFSET (1 * CONFIG_WAV_DEMUXER)
#if CONFIG_WAV_DEMUXER
{ "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
#endif
{ "max_size", "max size of single packet", OFFSET(max_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1 << 22, DEC },
{ NULL },
};
static void set_max_size(AVStream *st, WAVDemuxContext *wav)
{
if (wav->max_size <= 0) {
int max_size = ff_pcm_default_packet_size(st->codecpar);
wav->max_size = max_size < 0 ? 4096 : max_size;
}
}
static void set_spdif(AVFormatContext *s, WAVDemuxContext *wav)
{
if (CONFIG_SPDIF_DEMUXER && s->streams[0]->codecpar->codec_tag == 1) {
enum AVCodecID codec;
int len = 1<<16;
int ret = ffio_ensure_seekback(s->pb, len);
if (ret >= 0) {
uint8_t *buf = av_malloc(len + AV_INPUT_BUFFER_PADDING_SIZE);
if (!buf) {
ret = AVERROR(ENOMEM);
} else {
int64_t pos = avio_tell(s->pb);
len = ret = avio_read(s->pb, buf, len);
if (len >= 0) {
ret = ff_spdif_probe(buf, len, &codec);
if (ret > AVPROBE_SCORE_EXTENSION) {
s->streams[0]->codecpar->codec_id = codec;
wav->spdif = 1;
}
}
avio_seek(s->pb, pos, SEEK_SET);
av_free(buf);
}
}
if (ret < 0)
av_log(s, AV_LOG_WARNING, "Cannot check for SPDIF\n");
}
}
#if CONFIG_WAV_DEMUXER
static int64_t next_tag(AVIOContext *pb, uint32_t *tag, int big_endian)
{
*tag = avio_rl32(pb);
if (!big_endian) {
return avio_rl32(pb);
} else {
return avio_rb32(pb);
}
}
/* RIFF chunks are always at even offsets relative to where they start. */
static int64_t wav_seek_tag(WAVDemuxContext * wav, AVIOContext *s, int64_t offset, int whence)
{
offset += offset < INT64_MAX && offset + wav->unaligned & 1;
return avio_seek(s, offset, whence);
}
/* return the size of the found tag */
static int64_t find_tag(WAVDemuxContext * wav, AVIOContext *pb, uint32_t tag1)
{
unsigned int tag;
int64_t size;
for (;;) {
if (avio_feof(pb))
return AVERROR_EOF;
size = next_tag(pb, &tag, wav->rifx);
if (tag == tag1)
break;
wav_seek_tag(wav, pb, size, SEEK_CUR);
}
return size;
}
static int wav_probe(const AVProbeData *p)
{
/* check file header */
if (p->buf_size <= 32)
return 0;
if (!memcmp(p->buf + 8, "WAVE", 4)) {
if (!memcmp(p->buf, "RIFF", 4) || !memcmp(p->buf, "RIFX", 4))
/* Since the ACT demuxer has a standard WAV header at the top of
* its own, the returned score is decreased to avoid a probe
* conflict between ACT and WAV. */
return AVPROBE_SCORE_MAX - 1;
else if ((!memcmp(p->buf, "RF64", 4) ||
!memcmp(p->buf, "BW64", 4)) &&
!memcmp(p->buf + 12, "ds64", 4))
return AVPROBE_SCORE_MAX;
}
return 0;
}
static void handle_stream_probing(AVStream *st)
{
if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE) {
FFStream *const sti = ffstream(st);
sti->request_probe = AVPROBE_SCORE_EXTENSION;
sti->probe_packets = FFMIN(sti->probe_packets, 32);
}
}
static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream *st)
{
AVIOContext *pb = s->pb;
WAVDemuxContext *wav = s->priv_data;
int ret;
/* parse fmt header */
ret = ff_get_wav_header(s, pb, st->codecpar, size, wav->rifx);
if (ret < 0)
return ret;
handle_stream_probing(st);
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
static int wav_parse_xma2_tag(AVFormatContext *s, int64_t size, AVStream *st)
{
AVIOContext *pb = s->pb;
int version, num_streams, i, channels = 0, ret;
if (size < 36)
return AVERROR_INVALIDDATA;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_XMA2;
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
version = avio_r8(pb);
if (version != 3 && version != 4)
return AVERROR_INVALIDDATA;
num_streams = avio_r8(pb);
if (size != (32 + ((version==3)?0:8) + 4*num_streams))
return AVERROR_INVALIDDATA;
avio_skip(pb, 10);
st->codecpar->sample_rate = avio_rb32(pb);
if (version == 4)
avio_skip(pb, 8);
avio_skip(pb, 4);
st->duration = avio_rb32(pb);
avio_skip(pb, 8);
for (i = 0; i < num_streams; i++) {
channels += avio_r8(pb);
avio_skip(pb, 3);
}
av_channel_layout_uninit(&st->codecpar->ch_layout);
st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
st->codecpar->ch_layout.nb_channels = channels;
if (st->codecpar->ch_layout.nb_channels <= 0 || st->codecpar->sample_rate <= 0)
return AVERROR_INVALIDDATA;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
avio_seek(pb, -size, SEEK_CUR);
if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
return ret;
return 0;
}
static inline int wav_parse_bext_string(AVFormatContext *s, const char *key,
int length)
{
char temp[257];
int ret;
av_assert0(length < sizeof(temp));
if ((ret = ffio_read_size(s->pb, temp, length)) < 0)
return ret;
temp[length] = 0;
if (strlen(temp))
return av_dict_set(&s->metadata, key, temp, 0);
return 0;
}
static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
{
char temp[131], *coding_history;
int ret, x;
uint64_t time_reference;
int64_t umid_parts[8], umid_mask = 0;
if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
(ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
(ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
(ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
(ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
return ret;
time_reference = avio_rl64(s->pb);
snprintf(temp, sizeof(temp), "%"PRIu64, time_reference);
if ((ret = av_dict_set(&s->metadata, "time_reference", temp, 0)) < 0)
return ret;
/* check if version is >= 1, in which case an UMID may be present */
if (avio_rl16(s->pb) >= 1) {
for (x = 0; x < 8; x++)
umid_mask |= umid_parts[x] = avio_rb64(s->pb);
if (umid_mask) {
/* the string formatting below is per SMPTE 330M-2004 Annex C */
if (umid_parts[4] == 0 && umid_parts[5] == 0 &&
umid_parts[6] == 0 && umid_parts[7] == 0) {
/* basic UMID */
snprintf(temp, sizeof(temp),
"0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
umid_parts[0], umid_parts[1],
umid_parts[2], umid_parts[3]);
} else {
/* extended UMID */
snprintf(temp, sizeof(temp),
"0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64
"%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
umid_parts[0], umid_parts[1],
umid_parts[2], umid_parts[3],
umid_parts[4], umid_parts[5],
umid_parts[6], umid_parts[7]);
}
if ((ret = av_dict_set(&s->metadata, "umid", temp, 0)) < 0)
return ret;
}
avio_skip(s->pb, 190);
} else
avio_skip(s->pb, 254);
if (size > 602) {
/* CodingHistory present */
size -= 602;
if (!(coding_history = av_malloc(size + 1)))
return AVERROR(ENOMEM);
if ((ret = ffio_read_size(s->pb, coding_history, size)) < 0) {
av_free(coding_history);
return ret;
}
coding_history[size] = 0;
if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,
AV_DICT_DONT_STRDUP_VAL)) < 0)
return ret;
}
return 0;
}
static const AVMetadataConv wav_metadata_conv[] = {
{ "description", "comment" },
{ "originator", "encoded_by" },
{ "origination_date", "date" },
{ "origination_time", "creation_time" },
{ 0 },
};
/* wav input */
static int wav_read_header(AVFormatContext *s)
{
int64_t size, av_uninit(data_size);
int64_t sample_count = 0;
int rf64 = 0, bw64 = 0;
uint32_t tag;
AVIOContext *pb = s->pb;
AVStream *st = NULL;
WAVDemuxContext *wav = s->priv_data;
int ret, got_fmt = 0, got_xma2 = 0;
int64_t next_tag_ofs, data_ofs = -1;
wav->unaligned = avio_tell(s->pb) & 1;
wav->smv_data_ofs = -1;
/* read chunk ID */
tag = avio_rl32(pb);
switch (tag) {
case MKTAG('R', 'I', 'F', 'F'):
break;
case MKTAG('R', 'I', 'F', 'X'):
wav->rifx = 1;
break;
case MKTAG('R', 'F', '6', '4'):
rf64 = 1;
break;
case MKTAG('B', 'W', '6', '4'):
bw64 = 1;
break;
default:
av_log(s, AV_LOG_ERROR, "invalid start code %s in RIFF header\n",
av_fourcc2str(tag));
return AVERROR_INVALIDDATA;
}
/* read chunk size */
avio_rl32(pb);
/* read format */
if (avio_rl32(pb) != MKTAG('W', 'A', 'V', 'E')) {
av_log(s, AV_LOG_ERROR, "invalid format in RIFF header\n");
return AVERROR_INVALIDDATA;
}
if (rf64 || bw64) {
if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
return AVERROR_INVALIDDATA;
size = avio_rl32(pb);
if (size < 24)
return AVERROR_INVALIDDATA;
avio_rl64(pb); /* RIFF size */
data_size = avio_rl64(pb);
sample_count = avio_rl64(pb);
if (data_size < 0 || sample_count < 0) {
av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "
"ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",
data_size, sample_count);
return AVERROR_INVALIDDATA;
}
avio_skip(pb, size - 24); /* skip rest of ds64 chunk */
}
/* Create the audio stream now so that its index is always zero */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
for (;;) {
AVStream *vst;
size = next_tag(pb, &tag, wav->rifx);
next_tag_ofs = avio_tell(pb) + size;
if (avio_feof(pb))
break;
switch (tag) {
case MKTAG('f', 'm', 't', ' '):
/* only parse the first 'fmt ' tag found */
if (!got_xma2 && !got_fmt && (ret = wav_parse_fmt_tag(s, size, st)) < 0) {
return ret;
} else if (got_fmt)
av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");
got_fmt = 1;
break;
case MKTAG('X', 'M', 'A', '2'):
/* only parse the first 'XMA2' tag found */
if (!got_fmt && !got_xma2 && (ret = wav_parse_xma2_tag(s, size, st)) < 0) {
return ret;
} else if (got_xma2)
av_log(s, AV_LOG_WARNING, "found more than one 'XMA2' tag\n");
got_xma2 = 1;
break;
case MKTAG('d', 'a', 't', 'a'):
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) && !got_fmt && !got_xma2) {
av_log(s, AV_LOG_ERROR,
"found no 'fmt ' tag before the 'data' tag\n");
return AVERROR_INVALIDDATA;
}
if (rf64 || bw64) {
next_tag_ofs = wav->data_end = av_sat_add64(avio_tell(pb), data_size);
} else if (size != 0xFFFFFFFF) {
data_size = size;
next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
} else {
av_log(s, AV_LOG_WARNING, "Ignoring maximum wav data size, "
"file may be invalid\n");
data_size = 0;
next_tag_ofs = wav->data_end = INT64_MAX;
}
data_ofs = avio_tell(pb);
/* don't look for footer metadata if we can't seek or if we don't
* know where the data tag ends
*/
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) || (!(rf64 && !bw64) && !size))
goto break_loop;
break;
case MKTAG('f', 'a', 'c', 't'):
if (!sample_count)
sample_count = (!wav->rifx ? avio_rl32(pb) : avio_rb32(pb));
break;
case MKTAG('b', 'e', 'x', 't'):
if ((ret = wav_parse_bext_tag(s, size)) < 0)
return ret;
break;
case MKTAG('S','M','V','0'):
if (!got_fmt) {
av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
return AVERROR_INVALIDDATA;
}
// SMV file, a wav file with video appended.
if (size != MKTAG('0','2','0','0')) {
av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");
goto break_loop;
}
av_log(s, AV_LOG_DEBUG, "Found SMV data\n");
wav->smv_given_first = 0;
vst = avformat_new_stream(s, NULL);
if (!vst)
return AVERROR(ENOMEM);
wav->vst = vst;
avio_r8(pb);
vst->id = 1;
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = AV_CODEC_ID_SMVJPEG;
vst->codecpar->width = avio_rl24(pb);
vst->codecpar->height = avio_rl24(pb);
if ((ret = ff_alloc_extradata(vst->codecpar, 4)) < 0) {
av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n");
return ret;
}
size = avio_rl24(pb);
wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
avio_rl24(pb);
wav->smv_block_size = avio_rl24(pb);
if (!wav->smv_block_size)
return AVERROR_INVALIDDATA;
avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));
vst->duration = avio_rl24(pb);
avio_rl24(pb);
avio_rl24(pb);
wav->smv_frames_per_jpeg = avio_rl24(pb);
if (wav->smv_frames_per_jpeg > 65536) {
av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n");
return AVERROR_INVALIDDATA;
}
AV_WL32(vst->codecpar->extradata, wav->smv_frames_per_jpeg);
goto break_loop;
case MKTAG('L', 'I', 'S', 'T'):
case MKTAG('l', 'i', 's', 't'):
if (size < 4) {
av_log(s, AV_LOG_ERROR, "too short LIST tag\n");
return AVERROR_INVALIDDATA;
}
switch (avio_rl32(pb)) {
case MKTAG('I', 'N', 'F', 'O'):
ff_read_riff_info(s, size - 4);
break;
case MKTAG('a', 'd', 't', 'l'):
if (s->nb_chapters > 0) {
while (avio_tell(pb) < next_tag_ofs &&
!avio_feof(pb)) {
char cue_label[512];
unsigned id, sub_size;
if (avio_rl32(pb) != MKTAG('l', 'a', 'b', 'l'))
break;
sub_size = avio_rl32(pb);
if (sub_size < 5)
break;
id = avio_rl32(pb);
avio_get_str(pb, sub_size - 4, cue_label, sizeof(cue_label));
avio_skip(pb, avio_tell(pb) & 1);
for (int i = 0; i < s->nb_chapters; i++) {
if (s->chapters[i]->id == id) {
av_dict_set(&s->chapters[i]->metadata, "title", cue_label, 0);
break;
}
}
}
}
break;
}
break;
case MKTAG('I', 'D', '3', ' '):
case MKTAG('i', 'd', '3', ' '): {
ID3v2ExtraMeta *id3v2_extra_meta;
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
if (id3v2_extra_meta) {
ff_id3v2_parse_apic(s, id3v2_extra_meta);
ff_id3v2_parse_chapters(s, id3v2_extra_meta);
ff_id3v2_parse_priv(s, id3v2_extra_meta);
}
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
}
break;
case MKTAG('c', 'u', 'e', ' '):
if (size >= 4 && got_fmt && st->codecpar->sample_rate > 0) {
AVRational tb = {1, st->codecpar->sample_rate};
unsigned nb_cues = avio_rl32(pb);
if (size >= nb_cues * 24LL + 4LL) {
for (int i = 0; i < nb_cues; i++) {
unsigned offset, id = avio_rl32(pb);
if (avio_feof(pb))
return AVERROR_INVALIDDATA;
avio_skip(pb, 16);
offset = avio_rl32(pb);
if (!avpriv_new_chapter(s, id, tb, offset, AV_NOPTS_VALUE, NULL))
return AVERROR(ENOMEM);
}
}
}
break;
}
/* seek to next tag unless we know that we'll run into EOF */
if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) {
break;
}
}
break_loop:
if (!got_fmt && !got_xma2) {
av_log(s, AV_LOG_ERROR, "no 'fmt ' or 'XMA2' tag found\n");
return AVERROR_INVALIDDATA;
}
if (data_ofs < 0) {
av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
return AVERROR_INVALIDDATA;
}
avio_seek(pb, data_ofs, SEEK_SET);
if (data_size > (INT64_MAX>>3)) {
av_log(s, AV_LOG_WARNING, "Data size %"PRId64" is too large\n", data_size);
data_size = 0;
}
if ( st->codecpar->bit_rate > 0 && data_size > 0
&& st->codecpar->sample_rate > 0
&& sample_count > 0 && st->codecpar->ch_layout.nb_channels > 1
&& sample_count % st->codecpar->ch_layout.nb_channels == 0) {
if (fabs(8.0 * data_size * st->codecpar->ch_layout.nb_channels * st->codecpar->sample_rate /
sample_count /st->codecpar->bit_rate - 1.0) < 0.3)
sample_count /= st->codecpar->ch_layout.nb_channels;
}
if (data_size > 0 && sample_count && st->codecpar->ch_layout.nb_channels &&
(data_size << 3) / sample_count / st->codecpar->ch_layout.nb_channels > st->codecpar->bits_per_coded_sample + 1) {
av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
sample_count = 0;
}
/* G.729 hack (for Ticket4577)
* FIXME: Come up with cleaner, more general solution */
if (st->codecpar->codec_id == AV_CODEC_ID_G729 && sample_count && (data_size << 3) > sample_count) {
av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
sample_count = 0;
}
if (!sample_count || av_get_exact_bits_per_sample(st->codecpar->codec_id) > 0)
if ( st->codecpar->ch_layout.nb_channels
&& data_size
&& av_get_bits_per_sample(st->codecpar->codec_id)
&& wav->data_end <= avio_size(pb))
sample_count = (data_size << 3)
/
(st->codecpar->ch_layout.nb_channels * (uint64_t)av_get_bits_per_sample(st->codecpar->codec_id));
if (sample_count)
st->duration = sample_count;
if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S32LE &&
st->codecpar->block_align == st->codecpar->ch_layout.nb_channels * 4 &&
st->codecpar->bits_per_coded_sample == 32 &&
st->codecpar->extradata_size == 2 &&
AV_RL16(st->codecpar->extradata) == 1) {
st->codecpar->codec_id = AV_CODEC_ID_PCM_F16LE;
st->codecpar->bits_per_coded_sample = 16;
} else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S24LE &&
st->codecpar->block_align == st->codecpar->ch_layout.nb_channels * 4 &&
st->codecpar->bits_per_coded_sample == 24) {
st->codecpar->codec_id = AV_CODEC_ID_PCM_F24LE;
} else if (st->codecpar->codec_id == AV_CODEC_ID_XMA1 ||
st->codecpar->codec_id == AV_CODEC_ID_XMA2) {
st->codecpar->block_align = 2048;
} else if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_MS && st->codecpar->ch_layout.nb_channels > 2 &&
st->codecpar->block_align < INT_MAX / st->codecpar->ch_layout.nb_channels) {
st->codecpar->block_align *= st->codecpar->ch_layout.nb_channels;
}
ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
set_spdif(s, wav);
set_max_size(st, wav);
return 0;
}
/**
* Find chunk with w64 GUID by skipping over other chunks.
* @return the size of the found chunk
*/
static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
{
uint8_t guid[16];
int64_t size;
while (!avio_feof(pb)) {
avio_read(pb, guid, 16);
size = avio_rl64(pb);
if (size <= 24 || size > INT64_MAX - 8)
return AVERROR_INVALIDDATA;
if (!memcmp(guid, guid1, 16))
return size;
avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
}
return AVERROR_EOF;
}
static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size;
int64_t left;
WAVDemuxContext *wav = s->priv_data;
AVStream *st = s->streams[0];
if (CONFIG_SPDIF_DEMUXER && wav->spdif == 1)
return ff_spdif_read_packet(s, pkt);
if (wav->smv_data_ofs > 0) {
int64_t audio_dts, video_dts;
AVStream *vst = wav->vst;
smv_retry:
audio_dts = (int32_t)ffstream( st)->cur_dts;
video_dts = (int32_t)ffstream(vst)->cur_dts;
if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {
/*We always return a video frame first to get the pixel format first*/
wav->smv_last_stream = wav->smv_given_first ?
av_compare_ts(video_dts, vst->time_base,
audio_dts, st->time_base) > 0 : 0;
wav->smv_given_first = 1;
}
wav->smv_last_stream = !wav->smv_last_stream;
wav->smv_last_stream |= wav->audio_eof;
wav->smv_last_stream &= !wav->smv_eof;
if (wav->smv_last_stream) {
uint64_t old_pos = avio_tell(s->pb);
uint64_t new_pos = wav->smv_data_ofs +
wav->smv_block * (int64_t)wav->smv_block_size;
if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
ret = AVERROR_EOF;
goto smv_out;
}
size = avio_rl24(s->pb);
if (size > wav->smv_block_size) {
ret = AVERROR_EOF;
goto smv_out;
}
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
goto smv_out;
pkt->pos -= 3;
pkt->pts = wav->smv_block * wav->smv_frames_per_jpeg;
pkt->duration = wav->smv_frames_per_jpeg;
wav->smv_block++;
pkt->stream_index = vst->index;
smv_out:
avio_seek(s->pb, old_pos, SEEK_SET);
if (ret == AVERROR_EOF) {
wav->smv_eof = 1;
goto smv_retry;
}
return ret;
}
}
left = wav->data_end - avio_tell(s->pb);
if (wav->ignore_length)
left = INT_MAX;
if (left <= 0) {
if (CONFIG_W64_DEMUXER && wav->w64)
left = find_guid(s->pb, ff_w64_guid_data) - 24;
else
left = find_tag(wav, s->pb, MKTAG('d', 'a', 't', 'a'));
if (left < 0) {
wav->audio_eof = 1;
if (wav->smv_data_ofs > 0 && !wav->smv_eof)
goto smv_retry;
return AVERROR_EOF;
}
if (INT64_MAX - left < avio_tell(s->pb))
return AVERROR_INVALIDDATA;
wav->data_end = avio_tell(s->pb) + left;
}
size = wav->max_size;
if (st->codecpar->block_align > 1) {
if (size < st->codecpar->block_align)
size = st->codecpar->block_align;
size = (size / st->codecpar->block_align) * st->codecpar->block_align;
}
size = FFMIN(size, left);
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
return ret;
pkt->stream_index = 0;
return ret;
}
static int wav_read_seek(AVFormatContext *s,
int stream_index, int64_t timestamp, int flags)
{
WAVDemuxContext *wav = s->priv_data;
AVStream *ast = s->streams[0], *vst = wav->vst;
wav->smv_eof = 0;
wav->audio_eof = 0;
if (stream_index != 0 && (!vst || stream_index != vst->index))
return AVERROR(EINVAL);
if (wav->smv_data_ofs > 0) {
int64_t smv_timestamp = timestamp;
if (stream_index == 0)
smv_timestamp = av_rescale_q(timestamp, ast->time_base, vst->time_base);
else
timestamp = av_rescale_q(smv_timestamp, vst->time_base, ast->time_base);
if (wav->smv_frames_per_jpeg > 0) {
wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
}
}
switch (ast->codecpar->codec_id) {
case AV_CODEC_ID_MP2:
case AV_CODEC_ID_MP3:
case AV_CODEC_ID_AC3:
case AV_CODEC_ID_DTS:
case AV_CODEC_ID_XMA2:
/* use generic seeking with dynamically generated indexes */
return -1;
default:
break;
}
return ff_pcm_read_seek(s, 0, timestamp, flags);
}
static const AVClass wav_demuxer_class = {
.class_name = "WAV demuxer",
.option = demux_options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFInputFormat ff_wav_demuxer = {
.p.name = "wav",
.p.long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
.p.flags = AVFMT_GENERIC_INDEX,
.p.codec_tag = ff_wav_codec_tags_list,
.p.priv_class = &wav_demuxer_class,
.priv_data_size = sizeof(WAVDemuxContext),
.read_probe = wav_probe,
.read_header = wav_read_header,
.read_packet = wav_read_packet,
.read_seek = wav_read_seek,
};
#endif /* CONFIG_WAV_DEMUXER */
#if CONFIG_W64_DEMUXER
static int w64_probe(const AVProbeData *p)
{
if (p->buf_size <= 40)
return 0;
if (!memcmp(p->buf, ff_w64_guid_riff, 16) &&
!memcmp(p->buf + 24, ff_w64_guid_wave, 16))
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int w64_read_header(AVFormatContext *s)
{
int64_t size, data_ofs = 0;
AVIOContext *pb = s->pb;
WAVDemuxContext *wav = s->priv_data;
AVStream *st;
uint8_t guid[16];
int ret;
if (avio_read(pb, guid, 16) != 16 || memcmp(guid, ff_w64_guid_riff, 16))
return AVERROR_INVALIDDATA;
/* riff + wave + fmt + sizes */
if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8)
return AVERROR_INVALIDDATA;
avio_read(pb, guid, 16);
if (memcmp(guid, ff_w64_guid_wave, 16)) {
av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
return AVERROR_INVALIDDATA;
}
wav->w64 = 1;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
while (!avio_feof(pb)) {
if (avio_read(pb, guid, 16) != 16)
break;
size = avio_rl64(pb);
if (size <= 24 || INT64_MAX - size < avio_tell(pb)) {
if (data_ofs)
break;
return AVERROR_INVALIDDATA;
}
if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
/* subtract chunk header size - normal wav file doesn't count it */
ret = ff_get_wav_header(s, pb, st->codecpar, size - 24, 0);
if (ret < 0)
return ret;
avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
if (st->codecpar->block_align &&
st->codecpar->ch_layout.nb_channels < FF_SANE_NB_CHANNELS &&
st->codecpar->bits_per_coded_sample < 128) {
int block_align = st->codecpar->block_align;
block_align = FFMAX(block_align,
((st->codecpar->bits_per_coded_sample + 7) / 8) *
st->codecpar->ch_layout.nb_channels);
if (block_align > st->codecpar->block_align) {
av_log(s, AV_LOG_WARNING, "invalid block_align: %d, broken file.\n",
st->codecpar->block_align);
st->codecpar->block_align = block_align;
}
}
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
} else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
int64_t samples;
samples = avio_rl64(pb);
if (samples > 0)
st->duration = samples;
avio_skip(pb, FFALIGN(size, INT64_C(8)) - 32);
} else if (!memcmp(guid, ff_w64_guid_data, 16)) {
wav->data_end = avio_tell(pb) + size - 24;
data_ofs = avio_tell(pb);
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
break;
avio_skip(pb, size - 24);
} else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
int64_t start, end, cur;
uint32_t count, chunk_size, i;
int64_t filesize = avio_size(s->pb);
start = avio_tell(pb);
end = start + FFALIGN(size, INT64_C(8)) - 24;
count = avio_rl32(pb);
for (i = 0; i < count; i++) {
char chunk_key[5], *value;
if (avio_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)
break;
chunk_key[4] = 0;
avio_read(pb, chunk_key, 4);
chunk_size = avio_rl32(pb);
if (chunk_size == UINT32_MAX || (filesize >= 0 && chunk_size > filesize))
return AVERROR_INVALIDDATA;
value = av_malloc(chunk_size + 1);
if (!value)
return AVERROR(ENOMEM);
ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
if (ret < 0) {
av_free(value);
return ret;
}
avio_skip(pb, chunk_size - ret);
av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
}
avio_skip(pb, end - avio_tell(pb));
} else {
av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));
avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
}
}
if (!data_ofs)
return AVERROR_EOF;
ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
handle_stream_probing(st);
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
avio_seek(pb, data_ofs, SEEK_SET);
set_spdif(s, wav);
set_max_size(st, wav);
return 0;
}
static const AVClass w64_demuxer_class = {
.class_name = "W64 demuxer",
.option = &demux_options[W64_DEMUXER_OPTIONS_OFFSET],
.version = LIBAVUTIL_VERSION_INT,
};
const FFInputFormat ff_w64_demuxer = {
.p.name = "w64",
.p.long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
.p.flags = AVFMT_GENERIC_INDEX,
.p.codec_tag = ff_wav_codec_tags_list,
.p.priv_class = &w64_demuxer_class,
.priv_data_size = sizeof(WAVDemuxContext),
.read_probe = w64_probe,
.read_header = w64_read_header,
.read_packet = wav_read_packet,
.read_seek = wav_read_seek,
};
#endif /* CONFIG_W64_DEMUXER */
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