mirror of https://github.com/FFmpeg/FFmpeg.git
Anton Khirnov
12 years ago
parent
58b619c8a2
commit
31c54711cc
3 changed files with 230 additions and 195 deletions
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/*
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 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, fact; |
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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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fact = ff_start_tag(pb, "fact"); |
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avio_wl32(pb, 0); |
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ff_end_tag(pb, fact); |
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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->data-12, 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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