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FFmpeg/libavformat/wav.c

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/*
* WAV muxer and demuxer
* Copyright (c) 2001, 2002 Fabrice Bellard
*
* Sony Wave64 demuxer
* RF64 demuxer
* Copyright (c) 2009 Daniel Verkamp
*
* 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 "raw.h"
#include "riff.h"
typedef struct {
int64_t data;
int64_t data_end;
int64_t minpts;
int64_t maxpts;
int last_duration;
int w64;
} WAVContext;
#if CONFIG_WAV_MUXER
static int wav_write_header(AVFormatContext *s)
{
WAVContext *wav = s->priv_data;
ByteIOContext *pb = s->pb;
int64_t fmt, fact;
put_tag(pb, "RIFF");
put_le32(pb, 0); /* file length */
put_tag(pb, "WAVE");
/* format header */
fmt = ff_start_tag(pb, "fmt ");
if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
av_free(wav);
return -1;
}
ff_end_tag(pb, fmt);
if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
&& !url_is_streamed(s->pb)) {
fact = ff_start_tag(pb, "fact");
put_le32(pb, 0);
ff_end_tag(pb, fact);
}
av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
wav->maxpts = wav->last_duration = 0;
wav->minpts = INT64_MAX;
/* data header */
wav->data = ff_start_tag(pb, "data");
put_flush_packet(pb);
return 0;
}
static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
{
ByteIOContext *pb = s->pb;
WAVContext *wav = s->priv_data;
put_buffer(pb, pkt->data, pkt->size);
if(pkt->pts != AV_NOPTS_VALUE) {
wav->minpts = FFMIN(wav->minpts, pkt->pts);
wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
wav->last_duration = pkt->duration;
} else
av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
return 0;
}
static int wav_write_trailer(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
WAVContext *wav = s->priv_data;
int64_t file_size;
if (!url_is_streamed(s->pb)) {
ff_end_tag(pb, wav->data);
/* update file size */
file_size = url_ftell(pb);
url_fseek(pb, 4, SEEK_SET);
put_le32(pb, (uint32_t)(file_size - 8));
url_fseek(pb, file_size, SEEK_SET);
put_flush_packet(pb);
if(s->streams[0]->codec->codec_tag != 0x01) {
/* Update num_samps in fact chunk */
int number_of_samples;
number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
s->streams[0]->time_base.den);
url_fseek(pb, wav->data-12, SEEK_SET);
put_le32(pb, number_of_samples);
url_fseek(pb, file_size, SEEK_SET);
put_flush_packet(pb);
}
}
return 0;
}
AVOutputFormat wav_muxer = {
"wav",
NULL_IF_CONFIG_SMALL("WAV format"),
"audio/x-wav",
"wav",
sizeof(WAVContext),
CODEC_ID_PCM_S16LE,
CODEC_ID_NONE,
wav_write_header,
wav_write_packet,
wav_write_trailer,
.codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
};
#endif /* CONFIG_WAV_MUXER */
#if CONFIG_WAV_DEMUXER
/* return the size of the found tag */
static int64_t find_tag(ByteIOContext *pb, uint32_t tag1)
{
unsigned int tag;
int64_t size;
for (;;) {
if (url_feof(pb))
return -1;
tag = get_le32(pb);
size = get_le32(pb);
if (tag == tag1)
break;
url_fseek(pb, size, SEEK_CUR);
}
return size;
}
static int wav_probe(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))
/*
Since ACT demuxer has standard WAV header at top of it's own,
returning score is decreased to avoid probe conflict
between ACT and WAV.
*/
return AVPROBE_SCORE_MAX - 1;
else if (!memcmp(p->buf, "RF64", 4) &&
!memcmp(p->buf + 12, "ds64", 4))
return AVPROBE_SCORE_MAX;
}
return 0;
}
/* wav input */
static int wav_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
int64_t size, av_uninit(data_size);
int rf64;
unsigned int tag;
ByteIOContext *pb = s->pb;
AVStream *st;
WAVContext *wav = s->priv_data;
/* check RIFF header */
tag = get_le32(pb);
rf64 = tag == MKTAG('R', 'F', '6', '4');
if (!rf64 && tag != MKTAG('R', 'I', 'F', 'F'))
return -1;
get_le32(pb); /* file size */
tag = get_le32(pb);
if (tag != MKTAG('W', 'A', 'V', 'E'))
return -1;
if (rf64) {
if (get_le32(pb) != MKTAG('d', 's', '6', '4'))
return -1;
size = get_le32(pb);
if (size < 16)
return -1;
get_le64(pb); /* RIFF size */
data_size = get_le64(pb);
url_fskip(pb, size - 16); /* skip rest of ds64 chunk */
}
/* parse fmt header */
size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
if (size < 0)
return -1;
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
ff_get_wav_header(pb, st->codec, size);
st->need_parsing = AVSTREAM_PARSE_FULL;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
if (rf64)
size = data_size;
if (size < 0)
return -1;
if (!size) {
wav->data_end = INT64_MAX;
} else
wav->data_end= url_ftell(pb) + size;
return 0;
}
/** Find chunk with w64 GUID by skipping over other chunks
* @return the size of the found chunk
*/
static int64_t find_guid(ByteIOContext *pb, const uint8_t guid1[16])
{
uint8_t guid[16];
int64_t size;
while (!url_feof(pb)) {
get_buffer(pb, guid, 16);
size = get_le64(pb);
if (size <= 24)
return -1;
if (!memcmp(guid, guid1, 16))
return size;
url_fskip(pb, FFALIGN(size, INT64_C(8)) - 24);
}
return -1;
}
static const uint8_t guid_data[16] = { 'd', 'a', 't', 'a',
0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
#define MAX_SIZE 4096
static int wav_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
int ret, size;
int64_t left;
AVStream *st;
WAVContext *wav = s->priv_data;
st = s->streams[0];
left = wav->data_end - url_ftell(s->pb);
if (left <= 0){
if (CONFIG_W64_DEMUXER && wav->w64)
left = find_guid(s->pb, guid_data) - 24;
else
left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
if (left < 0)
return AVERROR_EOF;
wav->data_end= url_ftell(s->pb) + left;
}
size = MAX_SIZE;
if (st->codec->block_align > 1) {
if (size < st->codec->block_align)
size = st->codec->block_align;
size = (size / st->codec->block_align) * st->codec->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)
{
AVStream *st;
st = s->streams[0];
switch (st->codec->codec_id) {
case CODEC_ID_MP2:
case CODEC_ID_MP3:
case CODEC_ID_AC3:
case CODEC_ID_DTS:
/* use generic seeking with dynamically generated indexes */
return -1;
default:
break;
}
return pcm_read_seek(s, stream_index, timestamp, flags);
}
AVInputFormat wav_demuxer = {
"wav",
NULL_IF_CONFIG_SMALL("WAV format"),
sizeof(WAVContext),
wav_probe,
wav_read_header,
wav_read_packet,
NULL,
wav_read_seek,
.flags= AVFMT_GENERIC_INDEX,
.codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
};
#endif /* CONFIG_WAV_DEMUXER */
#if CONFIG_W64_DEMUXER
static const uint8_t guid_riff[16] = { 'r', 'i', 'f', 'f',
0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00 };
static const uint8_t guid_wave[16] = { 'w', 'a', 'v', 'e',
0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
static const uint8_t guid_fmt [16] = { 'f', 'm', 't', ' ',
0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
static int w64_probe(AVProbeData *p)
{
if (p->buf_size <= 40)
return 0;
if (!memcmp(p->buf, guid_riff, 16) &&
!memcmp(p->buf + 24, guid_wave, 16))
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int w64_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
int64_t size;
ByteIOContext *pb = s->pb;
WAVContext *wav = s->priv_data;
AVStream *st;
uint8_t guid[16];
get_buffer(pb, guid, 16);
if (memcmp(guid, guid_riff, 16))
return -1;
if (get_le64(pb) < 16 + 8 + 16 + 8 + 16 + 8) /* riff + wave + fmt + sizes */
return -1;
get_buffer(pb, guid, 16);
if (memcmp(guid, guid_wave, 16)) {
av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
return -1;
}
size = find_guid(pb, guid_fmt);
if (size < 0) {
av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
return -1;
}
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
/* subtract chunk header size - normal wav file doesn't count it */
ff_get_wav_header(pb, st->codec, size - 24);
url_fskip(pb, FFALIGN(size, INT64_C(8)) - size);
st->need_parsing = AVSTREAM_PARSE_FULL;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
size = find_guid(pb, guid_data);
if (size < 0) {
av_log(s, AV_LOG_ERROR, "could not find data guid\n");
return -1;
}
wav->data_end = url_ftell(pb) + size - 24;
wav->w64 = 1;
return 0;
}
AVInputFormat w64_demuxer = {
"w64",
NULL_IF_CONFIG_SMALL("Sony Wave64 format"),
sizeof(WAVContext),
w64_probe,
w64_read_header,
wav_read_packet,
NULL,
wav_read_seek,
.flags = AVFMT_GENERIC_INDEX,
.codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
};
#endif /* CONFIG_W64_DEMUXER */