mirror of https://git.ffmpeg.org/ffmpeg.git
286 lines
7.2 KiB
C
286 lines
7.2 KiB
C
/*
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* WAV muxer and demuxer
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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 "avformat.h"
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#include "allformats.h"
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#include "riff.h"
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typedef struct {
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offset_t data;
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offset_t data_end;
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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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} WAVContext;
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#ifdef CONFIG_MUXERS
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static int wav_write_header(AVFormatContext *s)
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{
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WAVContext *wav = s->priv_data;
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ByteIOContext *pb = &s->pb;
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offset_t fmt, fact;
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put_tag(pb, "RIFF");
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put_le32(pb, 0); /* file length */
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put_tag(pb, "WAVE");
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/* format header */
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fmt = start_tag(pb, "fmt ");
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if (put_wav_header(pb, s->streams[0]->codec) < 0) {
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av_free(wav);
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return -1;
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}
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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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&& !url_is_streamed(&s->pb)) {
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fact = start_tag(pb, "fact");
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put_le32(pb, 0);
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end_tag(pb, fact);
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}
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av_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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/* data header */
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wav->data = start_tag(pb, "data");
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put_flush_packet(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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ByteIOContext *pb = &s->pb;
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WAVContext *wav = s->priv_data;
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put_buffer(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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ByteIOContext *pb = &s->pb;
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WAVContext *wav = s->priv_data;
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offset_t file_size;
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if (!url_is_streamed(&s->pb)) {
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end_tag(pb, wav->data);
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/* update file size */
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file_size = url_ftell(pb);
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url_fseek(pb, 4, SEEK_SET);
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put_le32(pb, (uint32_t)(file_size - 8));
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url_fseek(pb, file_size, SEEK_SET);
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put_flush_packet(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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url_fseek(pb, wav->data-12, SEEK_SET);
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put_le32(pb, number_of_samples);
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url_fseek(pb, file_size, SEEK_SET);
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put_flush_packet(pb);
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}
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}
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return 0;
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}
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#endif //CONFIG_MUXERS
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/* return the size of the found tag */
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/* XXX: > 2GB ? */
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static int find_tag(ByteIOContext *pb, uint32_t tag1)
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{
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unsigned int tag;
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int size;
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for(;;) {
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if (url_feof(pb))
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return -1;
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tag = get_le32(pb);
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size = get_le32(pb);
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if (tag == tag1)
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break;
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url_fseek(pb, size, SEEK_CUR);
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}
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if (size < 0)
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size = 0x7fffffff;
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return size;
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}
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static int wav_probe(AVProbeData *p)
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{
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/* check file header */
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if (p->buf_size <= 32)
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return 0;
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if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
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p->buf[2] == 'F' && p->buf[3] == 'F' &&
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p->buf[8] == 'W' && p->buf[9] == 'A' &&
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p->buf[10] == 'V' && p->buf[11] == 'E')
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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/* wav input */
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static int wav_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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int size;
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unsigned int tag;
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ByteIOContext *pb = &s->pb;
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AVStream *st;
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WAVContext *wav = s->priv_data;
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/* check RIFF header */
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tag = get_le32(pb);
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if (tag != MKTAG('R', 'I', 'F', 'F'))
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return -1;
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get_le32(pb); /* file size */
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tag = get_le32(pb);
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if (tag != MKTAG('W', 'A', 'V', 'E'))
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return -1;
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/* parse fmt header */
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size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
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if (size < 0)
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return -1;
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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get_wav_header(pb, st->codec, size);
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st->need_parsing = AVSTREAM_PARSE_FULL;
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av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
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if (size < 0)
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return -1;
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wav->data_end= url_ftell(pb) + size;
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return 0;
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}
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#define MAX_SIZE 4096
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static int wav_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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int ret, size, left;
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AVStream *st;
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WAVContext *wav = s->priv_data;
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if (url_feof(&s->pb))
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return AVERROR(EIO);
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st = s->streams[0];
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left= wav->data_end - url_ftell(&s->pb);
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if(left <= 0){
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left = find_tag(&(s->pb), MKTAG('d', 'a', 't', 'a'));
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if (left < 0) {
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return AVERROR(EIO);
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}
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wav->data_end= url_ftell(&s->pb) + left;
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}
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size = MAX_SIZE;
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if (st->codec->block_align > 1) {
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if (size < st->codec->block_align)
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size = st->codec->block_align;
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size = (size / st->codec->block_align) * st->codec->block_align;
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}
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size= FFMIN(size, left);
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ret= av_get_packet(&s->pb, pkt, size);
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if (ret <= 0)
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return AVERROR(EIO);
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pkt->stream_index = 0;
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/* note: we need to modify the packet size here to handle the last
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packet */
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pkt->size = ret;
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return ret;
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}
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static int wav_read_close(AVFormatContext *s)
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{
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return 0;
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}
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static int wav_read_seek(AVFormatContext *s,
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int stream_index, int64_t timestamp, int flags)
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{
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AVStream *st;
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st = s->streams[0];
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switch(st->codec->codec_id) {
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case CODEC_ID_MP2:
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case CODEC_ID_MP3:
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case CODEC_ID_AC3:
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case CODEC_ID_DTS:
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/* use generic seeking with dynamically generated indexes */
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return -1;
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default:
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break;
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}
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return pcm_read_seek(s, stream_index, timestamp, flags);
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}
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#ifdef CONFIG_WAV_DEMUXER
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AVInputFormat wav_demuxer = {
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"wav",
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"wav format",
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sizeof(WAVContext),
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wav_probe,
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wav_read_header,
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wav_read_packet,
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wav_read_close,
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wav_read_seek,
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.flags= AVFMT_GENERIC_INDEX,
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.codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
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};
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#endif
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#ifdef CONFIG_WAV_MUXER
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AVOutputFormat wav_muxer = {
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"wav",
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"wav format",
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"audio/x-wav",
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"wav",
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sizeof(WAVContext),
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CODEC_ID_PCM_S16LE,
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CODEC_ID_NONE,
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wav_write_header,
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wav_write_packet,
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wav_write_trailer,
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.codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
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};
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#endif
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