296 lines
9.9 KiB
C
296 lines
9.9 KiB
C
/*
|
|
* RIFF muxing functions
|
|
* Copyright (c) 2000 Fabrice Bellard
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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,
|
|
* 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
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/dict.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"
|
|
|
|
int64_t ff_start_tag(AVIOContext *pb, const char *tag)
|
|
{
|
|
ffio_wfourcc(pb, tag);
|
|
avio_wl32(pb, 0);
|
|
return avio_tell(pb);
|
|
}
|
|
|
|
void ff_end_tag(AVIOContext *pb, int64_t start)
|
|
{
|
|
int64_t pos;
|
|
|
|
pos = avio_tell(pb);
|
|
avio_seek(pb, start - 4, SEEK_SET);
|
|
avio_wl32(pb, (uint32_t)(pos - start));
|
|
avio_seek(pb, pos, SEEK_SET);
|
|
}
|
|
|
|
/* WAVEFORMATEX header */
|
|
/* returns the size or -1 on error */
|
|
int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)
|
|
{
|
|
int bps, blkalign, bytespersec, frame_size;
|
|
int hdrsize = 18;
|
|
int waveformatextensible;
|
|
uint8_t temp[256];
|
|
uint8_t *riff_extradata = temp;
|
|
uint8_t *riff_extradata_start = temp;
|
|
|
|
if (!enc->codec_tag || enc->codec_tag > 0xffff)
|
|
return -1;
|
|
|
|
/* We use the known constant frame size for the codec if known, otherwise
|
|
* fall back on using AVCodecContext.frame_size, which is not as reliable
|
|
* for indicating packet duration. */
|
|
frame_size = av_get_audio_frame_duration(enc, 0);
|
|
if (!frame_size)
|
|
frame_size = enc->frame_size;
|
|
|
|
waveformatextensible = (enc->channels > 2 && enc->channel_layout) ||
|
|
enc->sample_rate > 48000 ||
|
|
av_get_bits_per_sample(enc->codec_id) > 16;
|
|
|
|
if (waveformatextensible)
|
|
avio_wl16(pb, 0xfffe);
|
|
else
|
|
avio_wl16(pb, enc->codec_tag);
|
|
|
|
avio_wl16(pb, enc->channels);
|
|
avio_wl32(pb, enc->sample_rate);
|
|
if (enc->codec_id == AV_CODEC_ID_MP2 ||
|
|
enc->codec_id == AV_CODEC_ID_MP3 ||
|
|
enc->codec_id == AV_CODEC_ID_GSM_MS) {
|
|
bps = 0;
|
|
} else {
|
|
if (!(bps = av_get_bits_per_sample(enc->codec_id))) {
|
|
if (enc->bits_per_coded_sample)
|
|
bps = enc->bits_per_coded_sample;
|
|
else
|
|
bps = 16; // default to 16
|
|
}
|
|
}
|
|
if (bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample) {
|
|
av_log(enc, AV_LOG_WARNING,
|
|
"requested bits_per_coded_sample (%d) "
|
|
"and actually stored (%d) differ\n",
|
|
enc->bits_per_coded_sample, bps);
|
|
}
|
|
|
|
if (enc->codec_id == AV_CODEC_ID_MP2 ||
|
|
enc->codec_id == AV_CODEC_ID_MP3) {
|
|
/* This is wrong, but it seems many demuxers do not work if this
|
|
* is set correctly. */
|
|
blkalign = frame_size;
|
|
// blkalign = 144 * enc->bit_rate/enc->sample_rate;
|
|
} else if (enc->codec_id == AV_CODEC_ID_AC3) {
|
|
blkalign = 3840; /* maximum bytes per frame */
|
|
} else if (enc->block_align != 0) { /* specified by the codec */
|
|
blkalign = enc->block_align;
|
|
} else
|
|
blkalign = bps * enc->channels / av_gcd(8, bps);
|
|
if (enc->codec_id == AV_CODEC_ID_PCM_U8 ||
|
|
enc->codec_id == AV_CODEC_ID_PCM_S24LE ||
|
|
enc->codec_id == AV_CODEC_ID_PCM_S32LE ||
|
|
enc->codec_id == AV_CODEC_ID_PCM_F32LE ||
|
|
enc->codec_id == AV_CODEC_ID_PCM_F64LE ||
|
|
enc->codec_id == AV_CODEC_ID_PCM_S16LE) {
|
|
bytespersec = enc->sample_rate * blkalign;
|
|
} else {
|
|
bytespersec = enc->bit_rate / 8;
|
|
}
|
|
avio_wl32(pb, bytespersec); /* bytes per second */
|
|
avio_wl16(pb, blkalign); /* block align */
|
|
avio_wl16(pb, bps); /* bits per sample */
|
|
if (enc->codec_id == AV_CODEC_ID_MP3) {
|
|
hdrsize += 12;
|
|
bytestream_put_le16(&riff_extradata, 1); /* wID */
|
|
bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
|
|
bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
|
|
bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
|
|
bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
|
|
} else if (enc->codec_id == AV_CODEC_ID_MP2) {
|
|
hdrsize += 22;
|
|
/* fwHeadLayer */
|
|
bytestream_put_le16(&riff_extradata, 2);
|
|
/* dwHeadBitrate */
|
|
bytestream_put_le32(&riff_extradata, enc->bit_rate);
|
|
/* fwHeadMode */
|
|
bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8);
|
|
/* fwHeadModeExt */
|
|
bytestream_put_le16(&riff_extradata, 0);
|
|
/* wHeadEmphasis */
|
|
bytestream_put_le16(&riff_extradata, 1);
|
|
/* fwHeadFlags */
|
|
bytestream_put_le16(&riff_extradata, 16);
|
|
/* dwPTSLow */
|
|
bytestream_put_le32(&riff_extradata, 0);
|
|
/* dwPTSHigh */
|
|
bytestream_put_le32(&riff_extradata, 0);
|
|
} else if (enc->codec_id == AV_CODEC_ID_GSM_MS ||
|
|
enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
|
|
hdrsize += 2;
|
|
/* wSamplesPerBlock */
|
|
bytestream_put_le16(&riff_extradata, frame_size);
|
|
} else if (enc->extradata_size) {
|
|
riff_extradata_start = enc->extradata;
|
|
riff_extradata = enc->extradata + enc->extradata_size;
|
|
hdrsize += enc->extradata_size;
|
|
}
|
|
/* write WAVEFORMATEXTENSIBLE extensions */
|
|
if (waveformatextensible) {
|
|
hdrsize += 22;
|
|
/* 22 is WAVEFORMATEXTENSIBLE size */
|
|
avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
|
|
/* ValidBitsPerSample || SamplesPerBlock || Reserved */
|
|
avio_wl16(pb, bps);
|
|
/* dwChannelMask */
|
|
avio_wl32(pb, enc->channel_layout);
|
|
/* GUID + next 3 */
|
|
avio_wl32(pb, enc->codec_tag);
|
|
avio_wl32(pb, 0x00100000);
|
|
avio_wl32(pb, 0xAA000080);
|
|
avio_wl32(pb, 0x719B3800);
|
|
} else {
|
|
avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
|
|
}
|
|
avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
|
|
if (hdrsize & 1) {
|
|
hdrsize++;
|
|
avio_w8(pb, 0);
|
|
}
|
|
|
|
return hdrsize;
|
|
}
|
|
|
|
/* BITMAPINFOHEADER header */
|
|
void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc,
|
|
const AVCodecTag *tags, int for_asf)
|
|
{
|
|
/* size */
|
|
avio_wl32(pb, 40 + enc->extradata_size);
|
|
avio_wl32(pb, enc->width);
|
|
//We always store RGB TopDown
|
|
avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height);
|
|
/* planes */
|
|
avio_wl16(pb, 1);
|
|
/* depth */
|
|
avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24);
|
|
/* compression type */
|
|
avio_wl32(pb, enc->codec_tag);
|
|
avio_wl32(pb, enc->width * enc->height * 3);
|
|
avio_wl32(pb, 0);
|
|
avio_wl32(pb, 0);
|
|
avio_wl32(pb, 0);
|
|
avio_wl32(pb, 0);
|
|
|
|
avio_write(pb, enc->extradata, enc->extradata_size);
|
|
|
|
if (!for_asf && enc->extradata_size & 1)
|
|
avio_w8(pb, 0);
|
|
}
|
|
|
|
void ff_parse_specific_params(AVCodecContext *stream, int *au_rate,
|
|
int *au_ssize, int *au_scale)
|
|
{
|
|
int gcd;
|
|
int audio_frame_size;
|
|
|
|
/* We use the known constant frame size for the codec if known, otherwise
|
|
* fall back on using AVCodecContext.frame_size, which is not as reliable
|
|
* for indicating packet duration. */
|
|
audio_frame_size = av_get_audio_frame_duration(stream, 0);
|
|
if (!audio_frame_size)
|
|
audio_frame_size = stream->frame_size;
|
|
|
|
*au_ssize = stream->block_align;
|
|
if (audio_frame_size && stream->sample_rate) {
|
|
*au_scale = audio_frame_size;
|
|
*au_rate = stream->sample_rate;
|
|
} else if (stream->codec_type == AVMEDIA_TYPE_VIDEO ||
|
|
stream->codec_type == AVMEDIA_TYPE_DATA ||
|
|
stream->codec_type == AVMEDIA_TYPE_SUBTITLE) {
|
|
*au_scale = stream->time_base.num;
|
|
*au_rate = stream->time_base.den;
|
|
} else {
|
|
*au_scale = stream->block_align ? stream->block_align * 8 : 8;
|
|
*au_rate = stream->bit_rate ? stream->bit_rate :
|
|
8 * stream->sample_rate;
|
|
}
|
|
gcd = av_gcd(*au_scale, *au_rate);
|
|
*au_scale /= gcd;
|
|
*au_rate /= gcd;
|
|
}
|
|
|
|
void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
|
|
{
|
|
int len = strlen(str);
|
|
if (len > 0) {
|
|
len++;
|
|
ffio_wfourcc(pb, tag);
|
|
avio_wl32(pb, len);
|
|
avio_put_str(pb, str);
|
|
if (len & 1)
|
|
avio_w8(pb, 0);
|
|
}
|
|
}
|
|
|
|
static const char riff_tags[][5] = {
|
|
"IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
|
|
"IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
|
|
"IPRT", "ITRK", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH",
|
|
{ 0 }
|
|
};
|
|
|
|
static int riff_has_valid_tags(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; *riff_tags[i]; i++)
|
|
if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ff_riff_write_info(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
int i;
|
|
int64_t list_pos;
|
|
AVDictionaryEntry *t = NULL;
|
|
|
|
ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
|
|
|
|
/* writing empty LIST is not nice and may cause problems */
|
|
if (!riff_has_valid_tags(s))
|
|
return;
|
|
|
|
list_pos = ff_start_tag(pb, "LIST");
|
|
ffio_wfourcc(pb, "INFO");
|
|
for (i = 0; *riff_tags[i]; i++)
|
|
if ((t = av_dict_get(s->metadata, riff_tags[i],
|
|
NULL, AV_DICT_MATCH_CASE)))
|
|
ff_riff_write_info_tag(s->pb, t->key, t->value);
|
|
ff_end_tag(pb, list_pos);
|
|
}
|