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FFmpeg/libavformat/riffenc.c
Mats Peterson ed5d295a69 lavf/riffenc: Improve spec compliance; Fix WMP playback of AVI with xxpc chunks 
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-03-13 13:12:13 +01:00

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/*
* RIFF muxing functions
* 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/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, -1);
return avio_tell(pb);
}
void ff_end_tag(AVIOContext *pb, int64_t start)
{
int64_t pos;
av_assert0((start&1) == 0);
pos = avio_tell(pb);
if (pos & 1)
avio_w8(pb, 0);
avio_seek(pb, start - 4, SEEK_SET);
avio_wl32(pb, (uint32_t)(pos - start));
avio_seek(pb, FFALIGN(pos, 2), SEEK_SET);
}
/* WAVEFORMATEX header */
/* returns the size or -1 on error */
int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc, int flags)
{
int bps, blkalign, bytespersec, frame_size;
int hdrsize;
int64_t hdrstart = avio_tell(pb);
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, enc->block_align);
waveformatextensible = (enc->channels > 2 && enc->channel_layout) ||
enc->sample_rate > 48000 ||
enc->codec_id == AV_CODEC_ID_EAC3 ||
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_ATRAC3 ||
enc->codec_id == AV_CODEC_ID_G723_1 ||
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) {
blkalign = (144 * enc->bit_rate - 1)/enc->sample_rate + 1;
} else if (enc->codec_id == AV_CODEC_ID_MP3) {
blkalign = 576 * (enc->sample_rate <= (24000 + 32000)/2 ? 1 : 2);
} else if (enc->codec_id == AV_CODEC_ID_AC3) {
blkalign = 3840; /* maximum bytes per frame */
} else if (enc->codec_id == AV_CODEC_ID_AAC) {
blkalign = 768 * enc->channels; /* maximum bytes per frame */
} else if (enc->codec_id == AV_CODEC_ID_G723_1) {
blkalign = 24;
} 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 if (enc->codec_id == AV_CODEC_ID_G723_1) {
bytespersec = 800;
} 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) {
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) {
/* 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_G723_1) {
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);
} else if (enc->codec_id == AV_CODEC_ID_GSM_MS ||
enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
/* 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;
}
/* write WAVEFORMATEXTENSIBLE extensions */
if (waveformatextensible) {
int write_channel_mask = !(flags & FF_PUT_WAV_HEADER_SKIP_CHANNELMASK) &&
(enc->strict_std_compliance < FF_COMPLIANCE_NORMAL ||
enc->channel_layout < 0x40000);
/* 22 is WAVEFORMATEXTENSIBLE size */
avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
/* ValidBitsPerSample || SamplesPerBlock || Reserved */
avio_wl16(pb, bps);
/* dwChannelMask */
avio_wl32(pb, write_channel_mask ? enc->channel_layout : 0);
/* GUID + next 3 */
if (enc->codec_id == AV_CODEC_ID_EAC3) {
ff_put_guid(pb, ff_get_codec_guid(enc->codec_id, ff_codec_wav_guids));
} else {
avio_wl32(pb, enc->codec_tag);
avio_wl32(pb, 0x00100000);
avio_wl32(pb, 0xAA000080);
avio_wl32(pb, 0x719B3800);
}
} else if ((flags & FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX) ||
enc->codec_tag != 0x0001 /* PCM */ ||
riff_extradata - riff_extradata_start) {
/* WAVEFORMATEX */
avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
} /* else PCMWAVEFORMAT */
avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
hdrsize = avio_tell(pb) - hdrstart;
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, int ignore_extradata)
{
int keep_height = enc->extradata_size >= 9 &&
!memcmp(enc->extradata + enc->extradata_size - 9, "BottomUp", 9);
int extradata_size = enc->extradata_size - 9*keep_height;
enum AVPixelFormat pix_fmt = enc->pix_fmt;
int pal_avi;
if (pix_fmt == AV_PIX_FMT_NONE && enc->bits_per_coded_sample == 1)
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);
/* Size (not including the size of the color table or color masks) */
avio_wl32(pb, 40 + (ignore_extradata || pal_avi ? 0 : extradata_size));
avio_wl32(pb, enc->width);
//We always store RGB TopDown
avio_wl32(pb, enc->codec_tag || keep_height ? 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 * (enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24)+7) / 8);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
/* 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. */
avio_wl32(pb, pal_avi ? 1 << enc->bits_per_coded_sample : 0);
avio_wl32(pb, 0);
if (!ignore_extradata) {
if (enc->extradata_size) {
avio_write(pb, enc->extradata, extradata_size);
if (!for_asf && extradata_size & 1)
avio_w8(pb, 0);
} else if (pal_avi) {
int i;
for (i = 0; i < 1 << enc->bits_per_coded_sample; i++) {
/* Initialize 1 bpp palette to black & white */
if (i == 0 && pix_fmt == AV_PIX_FMT_MONOWHITE)
avio_wl32(pb, 0xffffff);
else if (i == 1 && pix_fmt == AV_PIX_FMT_MONOBLACK)
avio_wl32(pb, 0xffffff);
else
avio_wl32(pb, 0);
}
}
}
}
void ff_parse_specific_params(AVStream *st, int *au_rate,
int *au_ssize, int *au_scale)
{
AVCodecContext *codec = st->codec;
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(codec, 0);
if (!audio_frame_size)
audio_frame_size = codec->frame_size;
*au_ssize = codec->block_align;
if (audio_frame_size && codec->sample_rate) {
*au_scale = audio_frame_size;
*au_rate = codec->sample_rate;
} else if (codec->codec_type == AVMEDIA_TYPE_VIDEO ||
codec->codec_type == AVMEDIA_TYPE_DATA ||
codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
*au_scale = st->time_base.num;
*au_rate = st->time_base.den;
} else {
*au_scale = codec->block_align ? codec->block_align * 8 : 8;
*au_rate = codec->bit_rate ? codec->bit_rate :
8 * codec->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)
{
size_t len = strlen(str);
if (len > 0 && len < UINT32_MAX) {
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);
}
void ff_put_guid(AVIOContext *s, const ff_asf_guid *g)
{
av_assert0(sizeof(*g) == 16);
avio_write(s, *g, sizeof(*g));
}
const ff_asf_guid *ff_get_codec_guid(enum AVCodecID id, const AVCodecGuid *av_guid)
{
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;
}
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