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FFmpeg/libavformat/riffenc.c
Jack Bruienne e6e3aae294 avformat: add DFPWM WAV container support 
This commit adds support for storing DFPWM audio in a WAV container.
It uses the WAVEFORMATEXTENSIBLE structure, following these conventions:
https://gist.github.com/MCJack123/90c24b64c8e626c7f130b57e9800962c
The implementation is very simple: it just adds the GUID to the list of
WAV GUIDs, and modifies the WAV muxer to always use WAVEFORMATEXTENSIBLE
format with that GUID.

This creates a standard container format for DFPWM besides raw data.
It will allow users to transfer DFPWM audio in a standard container
format, with the sample rate and channel count contained in the file
as opposed to being an external parameter as in the raw format.

This format is already supported in my AUKit library, which is the CC
analog to libav (albeit much smaller). Support in other applications is TBD.

Signed-off-by: Jack Bruienne <jackbruienne@gmail.com>
2022-03-10 14:11:12 +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/channel_layout.h"
#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(AVFormatContext *s, AVIOContext *pb,
AVCodecParameters *par, 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 (!par->codec_tag || par->codec_tag > 0xffff)
return -1;
if (par->codec_id == AV_CODEC_ID_ADPCM_SWF && par->block_align == 0) {
av_log(s, AV_LOG_ERROR, "%s can only be written to WAVE with a constant frame size\n",
avcodec_get_name(par->codec_id));
return AVERROR(EINVAL);
}
/* 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_duration2(par, par->block_align);
waveformatextensible = (par->channels > 2 && par->channel_layout) ||
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 ||
par->sample_rate > 48000 ||
par->codec_id == AV_CODEC_ID_EAC3 || par->codec_id == AV_CODEC_ID_DFPWM ||
av_get_bits_per_sample(par->codec_id) > 16;
if (waveformatextensible)
avio_wl16(pb, 0xfffe);
else
avio_wl16(pb, par->codec_tag);
avio_wl16(pb, par->channels);
avio_wl32(pb, par->sample_rate);
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 ||
par->codec_id == AV_CODEC_ID_GSM_MS) {
bps = 0;
} else {
if (!(bps = av_get_bits_per_sample(par->codec_id))) {
if (par->bits_per_coded_sample)
bps = par->bits_per_coded_sample;
else
bps = 16; // default to 16
}
}
if (bps != par->bits_per_coded_sample && par->bits_per_coded_sample) {
av_log(s, AV_LOG_WARNING,
"requested bits_per_coded_sample (%d) "
"and actually stored (%d) differ\n",
par->bits_per_coded_sample, bps);
}
if (par->codec_id == AV_CODEC_ID_MP2) {
blkalign = (144 * par->bit_rate - 1)/par->sample_rate + 1;
} else if (par->codec_id == AV_CODEC_ID_MP3) {
blkalign = 576 * (par->sample_rate <= (24000 + 32000)/2 ? 1 : 2);
} else if (par->codec_id == AV_CODEC_ID_AC3) {
blkalign = 3840; /* maximum bytes per frame */
} 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) {
blkalign = 24;
} else if (par->block_align != 0) { /* specified by the codec */
blkalign = par->block_align;
} else
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;
} else if (par->codec_id == AV_CODEC_ID_G723_1) {
bytespersec = 800;
} else {
bytespersec = par->bit_rate / 8;
}
avio_wl32(pb, bytespersec); /* bytes per second */
avio_wl16(pb, blkalign); /* block align */
avio_wl16(pb, bps); /* bits per sample */
if (par->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 (par->codec_id == AV_CODEC_ID_MP2) {
/* fwHeadLayer */
bytestream_put_le16(&riff_extradata, 2);
/* dwHeadBitrate */
bytestream_put_le32(&riff_extradata, par->bit_rate);
/* fwHeadMode */
bytestream_put_le16(&riff_extradata, par->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 (par->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 (par->codec_id == AV_CODEC_ID_GSM_MS ||
par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
/* wSamplesPerBlock */
bytestream_put_le16(&riff_extradata, frame_size);
} else if (par->extradata_size) {
riff_extradata_start = par->extradata;
riff_extradata = par->extradata + par->extradata_size;
}
/* write WAVEFORMATEXTENSIBLE extensions */
if (waveformatextensible) {
int write_channel_mask = !(flags & FF_PUT_WAV_HEADER_SKIP_CHANNELMASK) &&
(s->strict_std_compliance < FF_COMPLIANCE_NORMAL ||
par->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 ? par->channel_layout : 0);
/* GUID + next 3 */
if (par->codec_id == AV_CODEC_ID_EAC3 || par->codec_id == AV_CODEC_ID_DFPWM) {
ff_put_guid(pb, ff_get_codec_guid(par->codec_id, ff_codec_wav_guids));
} else {
avio_wl32(pb, par->codec_tag);
avio_wl32(pb, 0x00100000);
avio_wl32(pb, 0xAA000080);
avio_wl32(pb, 0x719B3800);
}
} else if ((flags & FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX) ||
par->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, AVCodecParameters *par,
int for_asf, int ignore_extradata, int rgb_frame_is_flipped)
{
int flipped_extradata = (par->extradata_size >= 9 &&
!memcmp(par->extradata + par->extradata_size - 9, "BottomUp", 9));
int keep_height = flipped_extradata || rgb_frame_is_flipped;
int extradata_size = par->extradata_size - 9*flipped_extradata;
enum AVPixelFormat pix_fmt = par->format;
int pal_avi;
if (pix_fmt == AV_PIX_FMT_NONE && par->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, par->width);
//We always store RGB TopDown
avio_wl32(pb, par->codec_tag || keep_height ? par->height : -par->height);
/* planes */
avio_wl16(pb, 1);
/* depth */
avio_wl16(pb, par->bits_per_coded_sample ? par->bits_per_coded_sample : 24);
/* compression type */
avio_wl32(pb, par->codec_tag);
avio_wl32(pb, (par->width * par->height * (par->bits_per_coded_sample ? par->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 << par->bits_per_coded_sample : 0);
avio_wl32(pb, 0);
if (!ignore_extradata) {
if (par->extradata_size) {
avio_write(pb, par->extradata, extradata_size);
if (!for_asf && extradata_size & 1)
avio_w8(pb, 0);
} else if (pal_avi) {
int i;
for (i = 0; i < 1 << par->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)
{
AVCodecParameters *par = st->codecpar;
int gcd;
int audio_frame_size;
audio_frame_size = av_get_audio_frame_duration2(par, 0);
if (!audio_frame_size)
audio_frame_size = par->frame_size;
*au_ssize = par->block_align;
if (audio_frame_size && par->sample_rate) {
*au_scale = audio_frame_size;
*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) {
*au_scale = st->time_base.num;
*au_rate = st->time_base.den;
} else {
*au_scale = par->block_align ? par->block_align * 8 : 8;
*au_rate = par->bit_rate ? par->bit_rate :
8 * par->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", "IAS1", "IAS2", "IAS3", "IAS4", "IAS5", "IAS6", "IAS7",
"IAS8", "IAS9", "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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