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/*
* RIFF muxing functions
* Copyright (c) 2000 Fabrice Bellard
* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* 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.
* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* 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); |
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avio_wl32(pb, -1); |
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return avio_tell(pb);
}
void ff_end_tag(AVIOContext *pb, int64_t start)
{
int64_t pos;
|
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av_assert0((start&1) == 0);
|
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pos = avio_tell(pb); |
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if (pos & 1)
avio_w8(pb, 0); |
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avio_seek(pb, start - 4, SEEK_SET);
avio_wl32(pb, (uint32_t)(pos - start)); |
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avio_seek(pb, FFALIGN(pos, 2), SEEK_SET); |
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}
/* WAVEFORMATEX header */
/* returns the size or -1 on error */ |
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int ff_put_wav_header(AVFormatContext *s, AVIOContext *pb, |
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AVCodecParameters *par, int flags) |
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{
int bps, blkalign, bytespersec, frame_size; |
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int hdrsize;
int64_t hdrstart = avio_tell(pb); |
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int waveformatextensible;
uint8_t temp[256];
uint8_t *riff_extradata = temp;
uint8_t *riff_extradata_start = temp;
|
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if (!par->codec_tag || par->codec_tag > 0xffff) |
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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. */ |
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frame_size = av_get_audio_frame_duration2(par, par->block_align); |
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|
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waveformatextensible = (par->channels > 2 && par->channel_layout) || |
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par->channels == 1 && par->channel_layout && par->channel_layout != AV_CH_LAYOUT_MONO ||
par->channels == 2 && par->channel_layout && par->channel_layout != AV_CH_LAYOUT_STEREO || |
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par->sample_rate > 48000 || |
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par->codec_id == AV_CODEC_ID_EAC3 || |
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av_get_bits_per_sample(par->codec_id) > 16; |
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if (waveformatextensible)
avio_wl16(pb, 0xfffe);
else |
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avio_wl16(pb, par->codec_tag); |
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|
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avio_wl16(pb, par->channels);
avio_wl32(pb, par->sample_rate); |
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if (par->codec_id == AV_CODEC_ID_ATRAC3 ||
par->codec_id == AV_CODEC_ID_G723_1 ||
par->codec_id == AV_CODEC_ID_MP2 ||
par->codec_id == AV_CODEC_ID_MP3 || |
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par->codec_id == AV_CODEC_ID_GSM_MS) { |
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bps = 0;
} else { |
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if (!(bps = av_get_bits_per_sample(par->codec_id))) {
if (par->bits_per_coded_sample)
bps = par->bits_per_coded_sample; |
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else
bps = 16; // default to 16
}
} |
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if (bps != par->bits_per_coded_sample && par->bits_per_coded_sample) {
av_log(s, AV_LOG_WARNING, |
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"requested bits_per_coded_sample (%d) "
"and actually stored (%d) differ\n", |
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par->bits_per_coded_sample, bps); |
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}
|
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if (par->codec_id == AV_CODEC_ID_MP2) { |
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blkalign = (144 * par->bit_rate - 1)/par->sample_rate + 1; |
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} else if (par->codec_id == AV_CODEC_ID_MP3) { |
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blkalign = 576 * (par->sample_rate <= (24000 + 32000)/2 ? 1 : 2); |
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} else if (par->codec_id == AV_CODEC_ID_AC3) { |
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blkalign = 3840; /* maximum bytes per frame */ |
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} else if (par->codec_id == AV_CODEC_ID_AAC) {
blkalign = 768 * par->channels; /* maximum bytes per frame */
} else if (par->codec_id == AV_CODEC_ID_G723_1) { |
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blkalign = 24; |
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} else if (par->block_align != 0) { /* specified by the codec */
blkalign = par->block_align; |
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} else |
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blkalign = bps * par->channels / av_gcd(8, bps);
if (par->codec_id == AV_CODEC_ID_PCM_U8 ||
par->codec_id == AV_CODEC_ID_PCM_S24LE ||
par->codec_id == AV_CODEC_ID_PCM_S32LE ||
par->codec_id == AV_CODEC_ID_PCM_F32LE ||
par->codec_id == AV_CODEC_ID_PCM_F64LE ||
par->codec_id == AV_CODEC_ID_PCM_S16LE) {
bytespersec = par->sample_rate * blkalign; |
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} else if (par->codec_id == AV_CODEC_ID_G723_1) { |
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bytespersec = 800; |
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} else { |
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bytespersec = par->bit_rate / 8; |
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}
avio_wl32(pb, bytespersec); /* bytes per second */
avio_wl16(pb, blkalign); /* block align */
avio_wl16(pb, bps); /* bits per sample */ |
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if (par->codec_id == AV_CODEC_ID_MP3) { |
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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 */ |
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} else if (par->codec_id == AV_CODEC_ID_MP2) { |
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/* fwHeadLayer */
bytestream_put_le16(&riff_extradata, 2);
/* dwHeadBitrate */ |
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bytestream_put_le32(&riff_extradata, par->bit_rate); |
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/* fwHeadMode */ |
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bytestream_put_le16(&riff_extradata, par->channels == 2 ? 1 : 8); |
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/* 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); |
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} else if (par->codec_id == AV_CODEC_ID_G723_1) { |
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bytestream_put_le32(&riff_extradata, 0x9ace0002); /* extradata needed for msacm g723.1 codec */
bytestream_put_le32(&riff_extradata, 0xaea2f732);
bytestream_put_le16(&riff_extradata, 0xacde); |
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} else if (par->codec_id == AV_CODEC_ID_GSM_MS ||
par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) { |
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/* wSamplesPerBlock */
bytestream_put_le16(&riff_extradata, frame_size); |
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} else if (par->extradata_size) {
riff_extradata_start = par->extradata;
riff_extradata = par->extradata + par->extradata_size; |
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}
/* write WAVEFORMATEXTENSIBLE extensions */
if (waveformatextensible) { |
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int write_channel_mask = !(flags & FF_PUT_WAV_HEADER_SKIP_CHANNELMASK) && |
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(s->strict_std_compliance < FF_COMPLIANCE_NORMAL ||
par->channel_layout < 0x40000); |
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/* 22 is WAVEFORMATEXTENSIBLE size */
avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
/* ValidBitsPerSample || SamplesPerBlock || Reserved */
avio_wl16(pb, bps);
/* dwChannelMask */ |
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avio_wl32(pb, write_channel_mask ? par->channel_layout : 0); |
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/* GUID + next 3 */ |
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if (par->codec_id == AV_CODEC_ID_EAC3) {
ff_put_guid(pb, ff_get_codec_guid(par->codec_id, ff_codec_wav_guids)); |
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} else { |
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avio_wl32(pb, par->codec_tag); |
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avio_wl32(pb, 0x00100000);
avio_wl32(pb, 0xAA000080);
avio_wl32(pb, 0x719B3800); |
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} |
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} else if ((flags & FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX) || |
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par->codec_tag != 0x0001 /* PCM */ || |
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riff_extradata - riff_extradata_start) {
/* WAVEFORMATEX */ |
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avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */ |
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} /* else PCMWAVEFORMAT */ |
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avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start); |
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hdrsize = avio_tell(pb) - hdrstart; |
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if (hdrsize & 1) {
hdrsize++;
avio_w8(pb, 0);
}
return hdrsize;
}
/* BITMAPINFOHEADER header */ |
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void ff_put_bmp_header(AVIOContext *pb, AVCodecParameters *par, |
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int for_asf, int ignore_extradata) |
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{ |
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int keep_height = par->extradata_size >= 9 &&
!memcmp(par->extradata + par->extradata_size - 9, "BottomUp", 9);
int extradata_size = par->extradata_size - 9*keep_height;
enum AVPixelFormat pix_fmt = par->format; |
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int pal_avi; |
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|
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if (pix_fmt == AV_PIX_FMT_NONE && par->bits_per_coded_sample == 1) |
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pix_fmt = AV_PIX_FMT_MONOWHITE;
pal_avi = !for_asf &&
(pix_fmt == AV_PIX_FMT_PAL8 ||
pix_fmt == AV_PIX_FMT_MONOWHITE ||
pix_fmt == AV_PIX_FMT_MONOBLACK);
|
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/* Size (not including the size of the color table or color masks) */
avio_wl32(pb, 40 + (ignore_extradata || pal_avi ? 0 : extradata_size)); |
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avio_wl32(pb, par->width); |
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//We always store RGB TopDown |
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avio_wl32(pb, par->codec_tag || keep_height ? par->height : -par->height); |
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/* planes */
avio_wl16(pb, 1);
/* depth */ |
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avio_wl16(pb, par->bits_per_coded_sample ? par->bits_per_coded_sample : 24); |
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/* compression type */ |
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avio_wl32(pb, par->codec_tag); |
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avio_wl32(pb, (par->width * par->height * (par->bits_per_coded_sample ? par->bits_per_coded_sample : 24)+7) / 8); |
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avio_wl32(pb, 0);
avio_wl32(pb, 0); |
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/* Number of color indices in the color table that are used.
* A value of 0 means 2^biBitCount indices, but this doesn't work
* with Windows Media Player and files containing xxpc chunks. */ |
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avio_wl32(pb, pal_avi ? 1 << par->bits_per_coded_sample : 0); |
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avio_wl32(pb, 0);
|
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if (!ignore_extradata) { |
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if (par->extradata_size) {
avio_write(pb, par->extradata, extradata_size); |
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if (!for_asf && extradata_size & 1)
avio_w8(pb, 0); |
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} else if (pal_avi) { |
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int i; |
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for (i = 0; i < 1 << par->bits_per_coded_sample; i++) { |
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/* Initialize 1 bpp palette to black & white */ |
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if (i == 0 && pix_fmt == AV_PIX_FMT_MONOWHITE)
avio_wl32(pb, 0xffffff);
else if (i == 1 && pix_fmt == AV_PIX_FMT_MONOBLACK) |
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avio_wl32(pb, 0xffffff);
else
avio_wl32(pb, 0);
}
} |
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} |
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}
|
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void ff_parse_specific_params(AVStream *st, int *au_rate, |
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int *au_ssize, int *au_scale)
{ |
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AVCodecParameters *par = st->codecpar; |
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int gcd;
int audio_frame_size;
|
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audio_frame_size = av_get_audio_frame_duration2(par, 0); |
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if (!audio_frame_size) |
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audio_frame_size = par->frame_size; |
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|
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*au_ssize = par->block_align;
if (audio_frame_size && par->sample_rate) { |
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*au_scale = audio_frame_size; |
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*au_rate = par->sample_rate;
} else if (par->codec_type == AVMEDIA_TYPE_VIDEO ||
par->codec_type == AVMEDIA_TYPE_DATA ||
par->codec_type == AVMEDIA_TYPE_SUBTITLE) { |
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*au_scale = st->time_base.num;
*au_rate = st->time_base.den; |
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} else { |
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*au_scale = par->block_align ? par->block_align * 8 : 8;
*au_rate = par->bit_rate ? par->bit_rate :
8 * par->sample_rate; |
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}
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)
{ |
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size_t len = strlen(str);
if (len > 0 && len < UINT32_MAX) { |
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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] = { |
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"IARL", "IART", "IAS1", "IAS2", "IAS3", "IAS4", "IAS5", "IAS6", "IAS7",
"IAS8", "IAS9", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI", |
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"IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD", |
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"IPRT", "ITRK", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH", |
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{ 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);
} |
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void ff_put_guid(AVIOContext *s, const ff_asf_guid *g)
{
av_assert0(sizeof(*g) == 16);
avio_write(s, *g, sizeof(*g));
}
|
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const ff_asf_guid *ff_get_codec_guid(enum AVCodecID id, const AVCodecGuid *av_guid) |
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{
int i;
for (i = 0; av_guid[i].id != AV_CODEC_ID_NONE; i++) {
if (id == av_guid[i].id)
return &(av_guid[i].guid);
}
return NULL;
} |