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/*
* WAV muxer
* Copyright (c) 2001, 2002 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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/dict.h"
#include "libavutil/common.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "avio.h"
#include "avio_internal.h"
#include "internal.h"
#include "riff.h"
typedef struct WAVMuxContext {
const AVClass *class;
int64_t data;
int64_t fact_pos;
int64_t minpts;
int64_t maxpts;
int last_duration;
int write_bext;
} WAVMuxContext;
static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
{
AVDictionaryEntry *tag;
int 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)) {
unsigned char umidpart_str[17] = {0};
int i;
uint64_t umidpart;
int 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 int wav_write_header(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
AVIOContext *pb = s->pb;
int64_t fmt;
ffio_wfourcc(pb, "RIFF");
avio_wl32(pb, 0); /* file length */
ffio_wfourcc(pb, "WAVE");
/* format header */
fmt = ff_start_tag(pb, "fmt ");
if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codec->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]->codec->codec_tag != 0x01 /* hence for all other than PCM */
&& s->pb->seekable) {
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);
avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
wav->maxpts = wav->last_duration = 0;
wav->minpts = INT64_MAX;
/* 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;
avio_write(pb, pkt->data, pkt->size);
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;
avio_flush(pb);
if (s->pb->seekable) {
ff_end_tag(pb, wav->data);
/* update file size */
file_size = avio_tell(pb);
avio_seek(pb, 4, SEEK_SET);
avio_wl32(pb, (uint32_t)(file_size - 8));
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
if(s->streams[0]->codec->codec_tag != 0x01) {
/* Update num_samps in fact chunk */
int number_of_samples;
number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
s->streams[0]->time_base.den);
avio_seek(pb, wav->fact_pos, SEEK_SET);
avio_wl32(pb, number_of_samples);
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
}
}
return 0;
}
#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_INT, { .i64 = 0 }, 0, 1, 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,
};
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