221 lines
6.6 KiB
C
221 lines
6.6 KiB
C
/*
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* WAV muxer
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* Copyright (c) 2001, 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <string.h>
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#include "libavutil/dict.h"
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#include "libavutil/common.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include "avio.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "riff.h"
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typedef struct WAVMuxContext {
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const AVClass *class;
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int64_t data;
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int64_t fact_pos;
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int64_t minpts;
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int64_t maxpts;
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int last_duration;
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int write_bext;
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} WAVMuxContext;
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static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
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{
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AVDictionaryEntry *tag;
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int len = 0;
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if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
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len = strlen(tag->value);
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len = FFMIN(len, maxlen);
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avio_write(s->pb, tag->value, len);
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}
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ffio_fill(s->pb, 0, maxlen - len);
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}
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static void bwf_write_bext_chunk(AVFormatContext *s)
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{
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AVDictionaryEntry *tmp_tag;
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uint64_t time_reference = 0;
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int64_t bext = ff_start_tag(s->pb, "bext");
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bwf_write_bext_string(s, "description", 256);
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bwf_write_bext_string(s, "originator", 32);
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bwf_write_bext_string(s, "originator_reference", 32);
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bwf_write_bext_string(s, "origination_date", 10);
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bwf_write_bext_string(s, "origination_time", 8);
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if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
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time_reference = strtoll(tmp_tag->value, NULL, 10);
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avio_wl64(s->pb, time_reference);
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avio_wl16(s->pb, 1); // set version to 1
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if (tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) {
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unsigned char umidpart_str[17] = {0};
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int i;
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uint64_t umidpart;
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int len = strlen(tmp_tag->value+2);
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for (i = 0; i < len/16; i++) {
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memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
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umidpart = strtoll(umidpart_str, NULL, 16);
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avio_wb64(s->pb, umidpart);
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}
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ffio_fill(s->pb, 0, 64 - i*8);
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} else
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ffio_fill(s->pb, 0, 64); // zero UMID
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ffio_fill(s->pb, 0, 190); // Reserved
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if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
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avio_put_str(s->pb, tmp_tag->value);
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ff_end_tag(s->pb, bext);
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}
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static int wav_write_header(AVFormatContext *s)
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{
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WAVMuxContext *wav = s->priv_data;
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AVIOContext *pb = s->pb;
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int64_t fmt;
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ffio_wfourcc(pb, "RIFF");
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avio_wl32(pb, 0); /* file length */
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ffio_wfourcc(pb, "WAVE");
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/* format header */
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fmt = ff_start_tag(pb, "fmt ");
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if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
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av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
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s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
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return -1;
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}
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ff_end_tag(pb, fmt);
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if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
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&& s->pb->seekable) {
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wav->fact_pos = ff_start_tag(pb, "fact");
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avio_wl32(pb, 0);
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ff_end_tag(pb, wav->fact_pos);
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}
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if (wav->write_bext)
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bwf_write_bext_chunk(s);
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avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
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wav->maxpts = wav->last_duration = 0;
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wav->minpts = INT64_MAX;
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/* info header */
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ff_riff_write_info(s);
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/* data header */
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wav->data = ff_start_tag(pb, "data");
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avio_flush(pb);
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return 0;
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}
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static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVIOContext *pb = s->pb;
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WAVMuxContext *wav = s->priv_data;
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avio_write(pb, pkt->data, pkt->size);
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if(pkt->pts != AV_NOPTS_VALUE) {
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wav->minpts = FFMIN(wav->minpts, pkt->pts);
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wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
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wav->last_duration = pkt->duration;
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} else
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av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
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return 0;
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}
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static int wav_write_trailer(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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WAVMuxContext *wav = s->priv_data;
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int64_t file_size;
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avio_flush(pb);
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if (s->pb->seekable) {
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ff_end_tag(pb, wav->data);
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/* update file size */
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file_size = avio_tell(pb);
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avio_seek(pb, 4, SEEK_SET);
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avio_wl32(pb, (uint32_t)(file_size - 8));
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avio_seek(pb, file_size, SEEK_SET);
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avio_flush(pb);
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if(s->streams[0]->codec->codec_tag != 0x01) {
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/* Update num_samps in fact chunk */
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int number_of_samples;
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number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
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s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
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s->streams[0]->time_base.den);
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avio_seek(pb, wav->fact_pos, SEEK_SET);
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avio_wl32(pb, number_of_samples);
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avio_seek(pb, file_size, SEEK_SET);
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avio_flush(pb);
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}
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}
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return 0;
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}
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#define OFFSET(x) offsetof(WAVMuxContext, x)
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#define ENC AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
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{ NULL },
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};
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static const AVClass wav_muxer_class = {
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.class_name = "WAV muxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVOutputFormat ff_wav_muxer = {
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.name = "wav",
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.long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
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.mime_type = "audio/x-wav",
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.extensions = "wav",
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.priv_data_size = sizeof(WAVMuxContext),
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.audio_codec = AV_CODEC_ID_PCM_S16LE,
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.video_codec = AV_CODEC_ID_NONE,
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.write_header = wav_write_header,
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.write_packet = wav_write_packet,
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.write_trailer = wav_write_trailer,
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.flags = AVFMT_TS_NONSTRICT,
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.codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
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.priv_class = &wav_muxer_class,
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};
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