mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
298 lines
9.5 KiB
C
298 lines
9.5 KiB
C
/*
|
|
* 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"
|
|
|
|
int ff_get_guid(AVIOContext *s, ff_asf_guid *g)
|
|
{
|
|
int ret;
|
|
av_assert0(sizeof(*g) == 16); //compiler will optimize this out
|
|
ret = avio_read(s, *g, sizeof(*g));
|
|
if (ret < (int)sizeof(*g)) {
|
|
memset(*g, 0, sizeof(*g));
|
|
return ret < 0 ? ret : AVERROR_INVALIDDATA;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
|
|
{
|
|
ff_asf_guid subformat;
|
|
int bps;
|
|
|
|
bps = avio_rl16(pb);
|
|
if (bps)
|
|
par->bits_per_coded_sample = bps;
|
|
par->channel_layout = avio_rl32(pb); /* dwChannelMask */
|
|
|
|
ff_get_guid(pb, &subformat);
|
|
if (!memcmp(subformat + 4,
|
|
(const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) ||
|
|
!memcmp(subformat + 4,
|
|
(const uint8_t[]){ FF_BROKEN_BASE_GUID }, 12) ||
|
|
!memcmp(subformat + 4,
|
|
(const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
|
|
par->codec_tag = AV_RL32(subformat);
|
|
par->codec_id = ff_wav_codec_get_id(par->codec_tag,
|
|
par->bits_per_coded_sample);
|
|
} else {
|
|
par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
|
|
if (!par->codec_id)
|
|
av_log(s, AV_LOG_WARNING,
|
|
"unknown subformat:"FF_PRI_GUID"\n",
|
|
FF_ARG_GUID(subformat));
|
|
}
|
|
}
|
|
|
|
/* "big_endian" values are needed for RIFX file format */
|
|
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb,
|
|
AVCodecParameters *par, int size, int big_endian)
|
|
{
|
|
int id;
|
|
uint64_t bitrate = 0;
|
|
|
|
if (size < 14) {
|
|
avpriv_request_sample(s, "wav header size < 14");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
par->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
if (!big_endian) {
|
|
id = avio_rl16(pb);
|
|
if (id != 0x0165) {
|
|
par->channels = avio_rl16(pb);
|
|
par->sample_rate = avio_rl32(pb);
|
|
bitrate = avio_rl32(pb) * 8LL;
|
|
par->block_align = avio_rl16(pb);
|
|
}
|
|
} else {
|
|
id = avio_rb16(pb);
|
|
par->channels = avio_rb16(pb);
|
|
par->sample_rate = avio_rb32(pb);
|
|
bitrate = avio_rb32(pb) * 8LL;
|
|
par->block_align = avio_rb16(pb);
|
|
}
|
|
if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
|
|
par->bits_per_coded_sample = 8;
|
|
} else {
|
|
if (!big_endian) {
|
|
par->bits_per_coded_sample = avio_rl16(pb);
|
|
} else {
|
|
par->bits_per_coded_sample = avio_rb16(pb);
|
|
}
|
|
}
|
|
if (id == 0xFFFE) {
|
|
par->codec_tag = 0;
|
|
} else {
|
|
par->codec_tag = id;
|
|
par->codec_id = ff_wav_codec_get_id(id,
|
|
par->bits_per_coded_sample);
|
|
}
|
|
if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
|
|
int cbSize = avio_rl16(pb); /* cbSize */
|
|
if (big_endian) {
|
|
avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
size -= 18;
|
|
cbSize = FFMIN(size, cbSize);
|
|
if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
|
|
parse_waveformatex(s, pb, par);
|
|
cbSize -= 22;
|
|
size -= 22;
|
|
}
|
|
if (cbSize > 0) {
|
|
if (ff_get_extradata(s, par, pb, cbSize) < 0)
|
|
return AVERROR(ENOMEM);
|
|
size -= cbSize;
|
|
}
|
|
|
|
/* It is possible for the chunk to contain garbage at the end */
|
|
if (size > 0)
|
|
avio_skip(pb, size);
|
|
} else if (id == 0x0165 && size >= 32) {
|
|
int nb_streams, i;
|
|
|
|
size -= 4;
|
|
if (ff_get_extradata(s, par, pb, size) < 0)
|
|
return AVERROR(ENOMEM);
|
|
nb_streams = AV_RL16(par->extradata + 4);
|
|
par->sample_rate = AV_RL32(par->extradata + 12);
|
|
par->channels = 0;
|
|
bitrate = 0;
|
|
if (size < 8 + nb_streams * 20)
|
|
return AVERROR_INVALIDDATA;
|
|
for (i = 0; i < nb_streams; i++)
|
|
par->channels += par->extradata[8 + i * 20 + 17];
|
|
}
|
|
|
|
par->bit_rate = bitrate;
|
|
|
|
if (par->sample_rate <= 0) {
|
|
av_log(s, AV_LOG_ERROR,
|
|
"Invalid sample rate: %d\n", par->sample_rate);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
|
|
/* Channels and sample_rate values are those prior to applying SBR
|
|
* and/or PS. */
|
|
par->channels = 0;
|
|
par->sample_rate = 0;
|
|
}
|
|
/* override bits_per_coded_sample for G.726 */
|
|
if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
|
|
par->bits_per_coded_sample = par->bit_rate / par->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_ADPCM_ZORK;
|
|
return id;
|
|
}
|
|
|
|
int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
|
|
{
|
|
int tag1;
|
|
uint32_t size_ = avio_rl32(pb);
|
|
if (size)
|
|
*size = size_;
|
|
st->codecpar->width = avio_rl32(pb);
|
|
st->codecpar->height = (int32_t)avio_rl32(pb);
|
|
avio_rl16(pb); /* planes */
|
|
st->codecpar->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 (avio_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);
|
|
// Work around VC++ 2015 Update 1 code-gen bug:
|
|
// https://connect.microsoft.com/VisualStudio/feedback/details/2291638
|
|
key[4] = 0;
|
|
|
|
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;
|
|
}
|