153 lines
4.6 KiB
C
153 lines
4.6 KiB
C
/*
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* SoX native format demuxer
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* Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
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*
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* Based on libSoX sox-fmt.c
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* Copyright (c) 2008 robs@users.sourceforge.net
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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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/**
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* SoX native format demuxer
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* @file
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* @author Daniel Verkamp
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* @sa http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
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*/
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "pcm.h"
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#include "sox.h"
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static int sox_probe(AVProbeData *p)
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{
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if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int sox_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVIOContext *pb = s->pb;
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unsigned header_size, comment_size;
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double sample_rate, sample_rate_frac;
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AVStream *st;
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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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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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if (avio_rl32(pb) == SOX_TAG) {
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st->codec->codec_id = CODEC_ID_PCM_S32LE;
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header_size = avio_rl32(pb);
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avio_seek(pb, 8, SEEK_CUR); /* sample count */
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sample_rate = av_int2dbl(avio_rl64(pb));
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st->codec->channels = avio_rl32(pb);
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comment_size = avio_rl32(pb);
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} else {
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st->codec->codec_id = CODEC_ID_PCM_S32BE;
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header_size = avio_rb32(pb);
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avio_seek(pb, 8, SEEK_CUR); /* sample count */
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sample_rate = av_int2dbl(avio_rb64(pb));
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st->codec->channels = avio_rb32(pb);
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comment_size = avio_rb32(pb);
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}
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if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
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av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
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return -1;
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}
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if (sample_rate <= 0 || sample_rate > INT_MAX) {
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av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
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return -1;
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}
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sample_rate_frac = sample_rate - floor(sample_rate);
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if (sample_rate_frac)
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av_log(s, AV_LOG_WARNING,
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"truncating fractional part of sample rate (%f)\n",
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sample_rate_frac);
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if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
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|| st->codec->channels > 65535) /* Reserve top 16 bits */ {
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av_log(s, AV_LOG_ERROR, "invalid header\n");
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return -1;
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}
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if (comment_size && comment_size < UINT_MAX) {
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char *comment = av_malloc(comment_size+1);
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if (avio_read(pb, comment, comment_size) != comment_size) {
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av_freep(&comment);
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return AVERROR(EIO);
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}
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comment[comment_size] = 0;
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av_metadata_set2(&s->metadata, "comment", comment,
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AV_METADATA_DONT_STRDUP_VAL);
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}
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avio_seek(pb, header_size - SOX_FIXED_HDR - comment_size, SEEK_CUR);
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st->codec->sample_rate = sample_rate;
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st->codec->bits_per_coded_sample = 32;
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st->codec->bit_rate = st->codec->sample_rate *
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st->codec->bits_per_coded_sample *
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st->codec->channels;
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st->codec->block_align = st->codec->bits_per_coded_sample *
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st->codec->channels / 8;
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av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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return 0;
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}
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#define SOX_SAMPLES 1024
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static int sox_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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int ret, size;
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if (url_feof(s->pb))
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return AVERROR_EOF;
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size = SOX_SAMPLES*s->streams[0]->codec->block_align;
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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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pkt->size = ret;
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return 0;
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}
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AVInputFormat ff_sox_demuxer = {
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"sox",
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NULL_IF_CONFIG_SMALL("SoX native format"),
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0,
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sox_probe,
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sox_read_header,
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sox_read_packet,
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NULL,
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pcm_read_seek,
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};
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