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FFmpeg/libavformat/wavenc.c
Tobias Rapp a07ac93023 avformat/wavenc: skip writing incorrect peak-of-peaks position value 
According to EBU tech 3285 supplement 3 the dwPosPeakOfPeaks field
should contain the absolute position to the maximum audio sample value,
but the current implementation writes the relative peak frame index
instead.

Fix the issue by writing the "unknown" value (-1) for now until the
feature is implemented correctly.

Previous version reviewed-by: Peter Bubestinger <p.bubestinger@av-rd.com>
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>
2017-10-26 08:29:41 +02:00

633 lines
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/*
* WAV muxer
* Copyright (c) 2001, 2002 Fabrice Bellard
*
* Sony Wave64 muxer
* Copyright (c) 2012 Paul B Mahol
*
* WAV muxer RF64 support
* Copyright (c) 2013 Daniel Verkamp <daniel@drv.nu>
*
* EBU Tech 3285 - Supplement 3 - Peak Envelope Chunk encoder
* Copyright (c) 2014 Georg Lippitsch <georg.lippitsch@gmx.at>
*
* 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 <stdint.h>
#include <string.h>
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavutil/time_internal.h"
#include "avformat.h"
#include "avio.h"
#include "avio_internal.h"
#include "internal.h"
#include "riff.h"
#define RF64_AUTO (-1)
#define RF64_NEVER 0
#define RF64_ALWAYS 1
#define PEAK_BUFFER_SIZE 1024
typedef enum {
PEAK_OFF = 0,
PEAK_ON,
PEAK_ONLY
} PeakType;
typedef enum {
PEAK_FORMAT_UINT8 = 1,
PEAK_FORMAT_UINT16
} PeakFormat;
typedef struct WAVMuxContext {
const AVClass *class;
int64_t data;
int64_t fact_pos;
int64_t ds64;
int64_t minpts;
int64_t maxpts;
int16_t *peak_maxpos, *peak_maxneg;
uint32_t peak_num_frames;
uint32_t peak_outbuf_size;
uint32_t peak_outbuf_bytes;
uint8_t *peak_output;
int last_duration;
int write_bext;
int write_peak;
int rf64;
int peak_block_size;
int peak_format;
int peak_block_pos;
int peak_ppv;
int peak_bps;
} WAVMuxContext;
#if CONFIG_WAV_MUXER
static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
{
AVDictionaryEntry *tag;
size_t len = 0;
if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
len = strlen(tag->value);
len = FFMIN(len, maxlen);
avio_write(s->pb, tag->value, len);
}
ffio_fill(s->pb, 0, maxlen - len);
}
static void bwf_write_bext_chunk(AVFormatContext *s)
{
AVDictionaryEntry *tmp_tag;
uint64_t time_reference = 0;
int64_t bext = ff_start_tag(s->pb, "bext");
bwf_write_bext_string(s, "description", 256);
bwf_write_bext_string(s, "originator", 32);
bwf_write_bext_string(s, "originator_reference", 32);
bwf_write_bext_string(s, "origination_date", 10);
bwf_write_bext_string(s, "origination_time", 8);
if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
time_reference = strtoll(tmp_tag->value, NULL, 10);
avio_wl64(s->pb, time_reference);
avio_wl16(s->pb, 1); // set version to 1
if ((tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) && strlen(tmp_tag->value) > 2) {
unsigned char umidpart_str[17] = {0};
int64_t i;
uint64_t umidpart;
size_t len = strlen(tmp_tag->value+2);
for (i = 0; i < len/16; i++) {
memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
umidpart = strtoll(umidpart_str, NULL, 16);
avio_wb64(s->pb, umidpart);
}
ffio_fill(s->pb, 0, 64 - i*8);
} else
ffio_fill(s->pb, 0, 64); // zero UMID
ffio_fill(s->pb, 0, 190); // Reserved
if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
avio_put_str(s->pb, tmp_tag->value);
ff_end_tag(s->pb, bext);
}
static av_cold void peak_free_buffers(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
av_freep(&wav->peak_maxpos);
av_freep(&wav->peak_maxneg);
av_freep(&wav->peak_output);
}
static av_cold int peak_init_writer(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
if (par->codec_id != AV_CODEC_ID_PCM_S8 &&
par->codec_id != AV_CODEC_ID_PCM_S16LE &&
par->codec_id != AV_CODEC_ID_PCM_U8 &&
par->codec_id != AV_CODEC_ID_PCM_U16LE) {
AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
av_log(s, AV_LOG_ERROR, "%s codec not supported for Peak Chunk\n",
codec ? codec->name : "NONE");
return -1;
}
wav->peak_bps = av_get_bits_per_sample(par->codec_id) / 8;
if (wav->peak_bps == 1 && wav->peak_format == PEAK_FORMAT_UINT16) {
av_log(s, AV_LOG_ERROR,
"Writing 16 bit peak for 8 bit audio does not make sense\n");
return AVERROR(EINVAL);
}
wav->peak_maxpos = av_mallocz_array(par->channels, sizeof(*wav->peak_maxpos));
wav->peak_maxneg = av_mallocz_array(par->channels, sizeof(*wav->peak_maxneg));
wav->peak_output = av_malloc(PEAK_BUFFER_SIZE);
if (!wav->peak_maxpos || !wav->peak_maxneg || !wav->peak_output)
goto nomem;
wav->peak_outbuf_size = PEAK_BUFFER_SIZE;
return 0;
nomem:
av_log(s, AV_LOG_ERROR, "Out of memory\n");
peak_free_buffers(s);
return AVERROR(ENOMEM);
}
static void peak_write_frame(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
int c;
if (!wav->peak_output)
return;
for (c = 0; c < par->channels; c++) {
wav->peak_maxneg[c] = -wav->peak_maxneg[c];
if (wav->peak_bps == 2 && wav->peak_format == PEAK_FORMAT_UINT8) {
wav->peak_maxpos[c] = wav->peak_maxpos[c] / 256;
wav->peak_maxneg[c] = wav->peak_maxneg[c] / 256;
}
if (wav->peak_ppv == 1)
wav->peak_maxpos[c] =
FFMAX(wav->peak_maxpos[c], wav->peak_maxneg[c]);
if (wav->peak_outbuf_size - wav->peak_outbuf_bytes <
wav->peak_format * wav->peak_ppv) {
wav->peak_outbuf_size += PEAK_BUFFER_SIZE;
wav->peak_output = av_realloc(wav->peak_output,
wav->peak_outbuf_size);
if (!wav->peak_output) {
av_log(s, AV_LOG_ERROR, "No memory for peak data\n");
return;
}
}
if (wav->peak_format == PEAK_FORMAT_UINT8) {
wav->peak_output[wav->peak_outbuf_bytes++] =
wav->peak_maxpos[c];
if (wav->peak_ppv == 2) {
wav->peak_output[wav->peak_outbuf_bytes++] =
wav->peak_maxneg[c];
}
} else {
AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
wav->peak_maxpos[c]);
wav->peak_outbuf_bytes += 2;
if (wav->peak_ppv == 2) {
AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
wav->peak_maxneg[c]);
wav->peak_outbuf_bytes += 2;
}
}
wav->peak_maxpos[c] = 0;
wav->peak_maxneg[c] = 0;
}
wav->peak_num_frames++;
}
static int peak_write_chunk(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
AVIOContext *pb = s->pb;
AVCodecParameters *par = s->streams[0]->codecpar;
int64_t peak = ff_start_tag(s->pb, "levl");
int64_t now0;
time_t now_secs;
char timestamp[28];
/* Peak frame of incomplete block at end */
if (wav->peak_block_pos)
peak_write_frame(s);
memset(timestamp, 0, sizeof(timestamp));
if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
struct tm tmpbuf;
av_log(s, AV_LOG_INFO, "Writing local time and date to Peak Envelope Chunk\n");
now0 = av_gettime();
now_secs = now0 / 1000000;
if (strftime(timestamp, sizeof(timestamp), "%Y:%m:%d:%H:%M:%S:", localtime_r(&now_secs, &tmpbuf))) {
av_strlcatf(timestamp, sizeof(timestamp), "%03d", (int)((now0 / 1000) % 1000));
} else {
av_log(s, AV_LOG_ERROR, "Failed to write timestamp\n");
return -1;
}
}
avio_wl32(pb, 1); /* version */
avio_wl32(pb, wav->peak_format); /* 8 or 16 bit */
avio_wl32(pb, wav->peak_ppv); /* positive and negative */
avio_wl32(pb, wav->peak_block_size); /* frames per value */
avio_wl32(pb, par->channels); /* number of channels */
avio_wl32(pb, wav->peak_num_frames); /* number of peak frames */
avio_wl32(pb, -1); /* audio sample frame position (not implemented) */
avio_wl32(pb, 128); /* equal to size of header */
avio_write(pb, timestamp, 28); /* ASCII time stamp */
ffio_fill(pb, 0, 60);
avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);
ff_end_tag(pb, peak);
if (!wav->data)
wav->data = peak;
return 0;
}
static int wav_write_header(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
AVIOContext *pb = s->pb;
int64_t fmt;
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "WAVE files have exactly one stream\n");
return AVERROR(EINVAL);
}
if (wav->rf64 == RF64_ALWAYS) {
ffio_wfourcc(pb, "RF64");
avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
} else {
ffio_wfourcc(pb, "RIFF");
avio_wl32(pb, -1); /* file length */
}
ffio_wfourcc(pb, "WAVE");
if (wav->rf64 != RF64_NEVER) {
/* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
avio_wl32(pb, 28); /* chunk size */
wav->ds64 = avio_tell(pb);
ffio_fill(pb, 0, 28);
}
if (wav->write_peak != PEAK_ONLY) {
/* format header */
fmt = ff_start_tag(pb, "fmt ");
if (ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0) < 0) {
const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codecpar->codec_id);
av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
desc ? desc->name : "unknown");
return AVERROR(ENOSYS);
}
ff_end_tag(pb, fmt);
}
if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
&& (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
wav->fact_pos = ff_start_tag(pb, "fact");
avio_wl32(pb, 0);
ff_end_tag(pb, wav->fact_pos);
}
if (wav->write_bext)
bwf_write_bext_chunk(s);
if (wav->write_peak) {
int ret;
if ((ret = peak_init_writer(s)) < 0)
return ret;
}
avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);
wav->maxpts = wav->last_duration = 0;
wav->minpts = INT64_MAX;
if (wav->write_peak != PEAK_ONLY) {
/* info header */
ff_riff_write_info(s);
/* data header */
wav->data = ff_start_tag(pb, "data");
}
avio_flush(pb);
return 0;
}
static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
WAVMuxContext *wav = s->priv_data;
if (wav->write_peak != PEAK_ONLY)
avio_write(pb, pkt->data, pkt->size);
if (wav->write_peak) {
int c = 0;
int i;
for (i = 0; i < pkt->size; i += wav->peak_bps) {
if (wav->peak_bps == 1) {
wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
} else {
wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
}
if (++c == s->streams[0]->codecpar->channels) {
c = 0;
if (++wav->peak_block_pos == wav->peak_block_size) {
peak_write_frame(s);
wav->peak_block_pos = 0;
}
}
}
}
if(pkt->pts != AV_NOPTS_VALUE) {
wav->minpts = FFMIN(wav->minpts, pkt->pts);
wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
wav->last_duration = pkt->duration;
} else
av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
return 0;
}
static int wav_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
WAVMuxContext *wav = s->priv_data;
int64_t file_size, data_size;
int64_t number_of_samples = 0;
int rf64 = 0;
int ret = 0;
avio_flush(pb);
if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
if (wav->write_peak != PEAK_ONLY && avio_tell(pb) - wav->data < UINT32_MAX) {
ff_end_tag(pb, wav->data);
avio_flush(pb);
}
if (wav->write_peak && wav->peak_output) {
ret = peak_write_chunk(s);
avio_flush(pb);
}
/* update file size */
file_size = avio_tell(pb);
data_size = file_size - wav->data;
if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
rf64 = 1;
} else if (file_size - 8 <= UINT32_MAX) {
avio_seek(pb, 4, SEEK_SET);
avio_wl32(pb, (uint32_t)(file_size - 8));
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
} else {
av_log(s, AV_LOG_ERROR,
"Filesize %"PRId64" invalid for wav, output file will be broken\n",
file_size);
}
number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
s->streams[0]->time_base.den);
if(s->streams[0]->codecpar->codec_tag != 0x01) {
/* Update num_samps in fact chunk */
avio_seek(pb, wav->fact_pos, SEEK_SET);
if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
rf64 = 1;
avio_wl32(pb, -1);
} else {
avio_wl32(pb, number_of_samples);
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
}
}
if (rf64) {
/* overwrite RIFF with RF64 */
avio_seek(pb, 0, SEEK_SET);
ffio_wfourcc(pb, "RF64");
avio_wl32(pb, -1);
/* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
avio_seek(pb, wav->ds64 - 8, SEEK_SET);
ffio_wfourcc(pb, "ds64");
avio_wl32(pb, 28); /* ds64 chunk size */
avio_wl64(pb, file_size - 8); /* RF64 chunk size */
avio_wl64(pb, data_size); /* data chunk size */
avio_wl64(pb, number_of_samples); /* fact chunk number of samples */
avio_wl32(pb, 0); /* number of table entries for non-'data' chunks */
/* write -1 in data chunk size */
avio_seek(pb, wav->data - 4, SEEK_SET);
avio_wl32(pb, -1);
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
}
}
if (wav->write_peak)
peak_free_buffers(s);
return ret;
}
#define OFFSET(x) offsetof(WAVMuxContext, x)
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
{ "write_peak", "Write Peak Envelope chunk.", OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
{ "off", "Do not write peak chunk.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF }, 0, 0, ENC, "peak" },
{ "on", "Append peak chunk after wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ON }, 0, 0, ENC, "peak" },
{ "only", "Write only peak chunk, omit wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
{ "rf64", "Use RF64 header rather than RIFF for large files.", OFFSET(rf64), AV_OPT_TYPE_INT, { .i64 = RF64_NEVER },-1, 1, ENC, "rf64" },
{ "auto", "Write RF64 header if file grows large enough.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO }, 0, 0, ENC, "rf64" },
{ "always", "Always write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
{ "never", "Never write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER }, 0, 0, ENC, "rf64" },
{ "peak_block_size", "Number of audio samples used to generate each peak frame.", OFFSET(peak_block_size), AV_OPT_TYPE_INT, { .i64 = 256 }, 0, 65536, ENC },
{ "peak_format", "The format of the peak envelope data (1: uint8, 2: uint16).", OFFSET(peak_format), AV_OPT_TYPE_INT, { .i64 = PEAK_FORMAT_UINT16 }, PEAK_FORMAT_UINT8, PEAK_FORMAT_UINT16, ENC },
{ "peak_ppv", "Number of peak points per peak value (1 or 2).", OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
{ NULL },
};
static const AVClass wav_muxer_class = {
.class_name = "WAV muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_wav_muxer = {
.name = "wav",
.long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
.mime_type = "audio/x-wav",
.extensions = "wav",
.priv_data_size = sizeof(WAVMuxContext),
.audio_codec = AV_CODEC_ID_PCM_S16LE,
.video_codec = AV_CODEC_ID_NONE,
.write_header = wav_write_header,
.write_packet = wav_write_packet,
.write_trailer = wav_write_trailer,
.flags = AVFMT_TS_NONSTRICT,
.codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
.priv_class = &wav_muxer_class,
};
#endif /* CONFIG_WAV_MUXER */
#if CONFIG_W64_MUXER
#include "w64.h"
static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
{
*pos = avio_tell(pb);
avio_write(pb, guid, 16);
avio_wl64(pb, INT64_MAX);
}
static void end_guid(AVIOContext *pb, int64_t start)
{
int64_t end, pos = avio_tell(pb);
end = FFALIGN(pos, 8);
ffio_fill(pb, 0, end - pos);
avio_seek(pb, start + 16, SEEK_SET);
avio_wl64(pb, end - start);
avio_seek(pb, end, SEEK_SET);
}
static int w64_write_header(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
AVIOContext *pb = s->pb;
int64_t start;
int ret;
avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
avio_wl64(pb, -1);
avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
start_guid(pb, ff_w64_guid_fmt, &start);
if ((ret = ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0)) < 0) {
AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
codec ? codec->name : "NONE");
return ret;
}
end_guid(pb, start);
if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
&& (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
avio_wl64(pb, 0);
end_guid(pb, wav->fact_pos);
}
start_guid(pb, ff_w64_guid_data, &wav->data);
return 0;
}
static int w64_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
WAVMuxContext *wav = s->priv_data;
int64_t file_size;
if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
end_guid(pb, wav->data);
file_size = avio_tell(pb);
avio_seek(pb, 16, SEEK_SET);
avio_wl64(pb, file_size);
if (s->streams[0]->codecpar->codec_tag != 0x01) {
int64_t number_of_samples;
number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
s->streams[0]->time_base.den);
avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
avio_wl64(pb, number_of_samples);
}
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
}
return 0;
}
AVOutputFormat ff_w64_muxer = {
.name = "w64",
.long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
.extensions = "w64",
.priv_data_size = sizeof(WAVMuxContext),
.audio_codec = AV_CODEC_ID_PCM_S16LE,
.video_codec = AV_CODEC_ID_NONE,
.write_header = w64_write_header,
.write_packet = wav_write_packet,
.write_trailer = w64_write_trailer,
.flags = AVFMT_TS_NONSTRICT,
.codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
};
#endif /* CONFIG_W64_MUXER */
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