static int write_stream_codec_info(AVFormatContext *s, AVStream *st)
{
WtvContext *wctx = s->priv_data;
const ff_asf_guid *g, *media_type, *format_type;
AVIOContext *pb = s->pb;
int64_t hdr_pos_start;
int hdr_size = 0;
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
g = get_codec_guid(st->codec->codec_id, ff_video_guids);
media_type = &ff_mediatype_video;
format_type = &ff_format_mpeg2_video;
} else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
g = get_codec_guid(st->codec->codec_id, ff_codec_wav_guids);
media_type = &ff_mediatype_audio;
format_type = &ff_format_waveformatex;
} else {
av_log(s, AV_LOG_ERROR, "unknown codec_type (0x%x)\n", st->codec->codec_type);
return -1;
}
if (g == NULL) {
av_log(s, AV_LOG_ERROR, "can't get video codec_id (0x%x) guid.\n", st->codec->codec_id);
return -1;
}
ff_put_guid(pb, media_type); // mediatype
ff_put_guid(pb, &ff_mediasubtype_cpfilters_processed); // subtype
write_pad(pb, 12);
ff_put_guid(pb,&ff_format_cpfilters_processed); // format type
avio_wl32(pb, 0); // size
hdr_pos_start = avio_tell(pb);
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
if (wctx->first_video_flag) {
write_pad(pb, 216); //The size is sensitive.
wctx->first_video_flag = 0;
} else {
write_pad(pb, 72); // aspect ratio
ff_put_bmp_header(pb, st->codec, ff_codec_bmp_tags, 0);
}
} else {
ff_put_wav_header(pb, st->codec);
}
hdr_size = avio_tell(pb) - hdr_pos_start;
// seek back write hdr_size
avio_seek(pb, -(hdr_size + 4), SEEK_CUR);
avio_wl32(pb, hdr_size + 32);
avio_seek(pb, hdr_size, SEEK_CUR);
ff_put_guid(pb, g); // actual_subtype
ff_put_guid(pb, format_type); // actual_formattype
return 0;
}
/* 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, 0);
if (!frame_size)
frame_size = enc->frame_size;
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 ||
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->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 = 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, 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;
}