1/* 2 * SoX native format demuxer 3 * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu> 4 * 5 * Based on libSoX sox-fmt.c 6 * Copyright (c) 2008 robs@users.sourceforge.net 7 * 8 * This file is part of FFmpeg. 9 * 10 * FFmpeg is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2.1 of the License, or (at your option) any later version. 14 * 15 * FFmpeg is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with FFmpeg; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 23 */ 24 25/** 26 * SoX native format demuxer 27 * @file 28 * @author Daniel Verkamp 29 * @sa http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format 30 */ 31 32#include "libavutil/intreadwrite.h" 33#include "avformat.h" 34#include "raw.h" 35#include "sox.h" 36 37static int sox_probe(AVProbeData *p) 38{ 39 if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG) 40 return AVPROBE_SCORE_MAX; 41 return 0; 42} 43 44static int sox_read_header(AVFormatContext *s, 45 AVFormatParameters *ap) 46{ 47 ByteIOContext *pb = s->pb; 48 unsigned header_size, comment_size; 49 double sample_rate, sample_rate_frac; 50 AVStream *st; 51 52 st = av_new_stream(s, 0); 53 if (!st) 54 return AVERROR(ENOMEM); 55 56 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 57 58 if (get_le32(pb) == SOX_TAG) { 59 st->codec->codec_id = CODEC_ID_PCM_S32LE; 60 header_size = get_le32(pb); 61 url_fskip(pb, 8); /* sample count */ 62 sample_rate = av_int2dbl(get_le64(pb)); 63 st->codec->channels = get_le32(pb); 64 comment_size = get_le32(pb); 65 } else { 66 st->codec->codec_id = CODEC_ID_PCM_S32BE; 67 header_size = get_be32(pb); 68 url_fskip(pb, 8); /* sample count */ 69 sample_rate = av_int2dbl(get_be64(pb)); 70 st->codec->channels = get_be32(pb); 71 comment_size = get_be32(pb); 72 } 73 74 if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) { 75 av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size); 76 return -1; 77 } 78 79 if (sample_rate <= 0 || sample_rate > INT_MAX) { 80 av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate); 81 return -1; 82 } 83 84 sample_rate_frac = sample_rate - floor(sample_rate); 85 if (sample_rate_frac) 86 av_log(s, AV_LOG_WARNING, 87 "truncating fractional part of sample rate (%f)\n", 88 sample_rate_frac); 89 90 if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size 91 || st->codec->channels > 65535) /* Reserve top 16 bits */ { 92 av_log(s, AV_LOG_ERROR, "invalid header\n"); 93 return -1; 94 } 95 96 if (comment_size && comment_size < UINT_MAX) { 97 char *comment = av_malloc(comment_size+1); 98 if (get_buffer(pb, comment, comment_size) != comment_size) { 99 av_freep(&comment); 100 return AVERROR(EIO); 101 } 102 comment[comment_size] = 0; 103 104 av_metadata_set2(&s->metadata, "comment", comment, 105 AV_METADATA_DONT_STRDUP_VAL); 106 } 107 108 url_fskip(pb, header_size - SOX_FIXED_HDR - comment_size); 109 110 st->codec->sample_rate = sample_rate; 111 st->codec->bits_per_coded_sample = 32; 112 st->codec->bit_rate = st->codec->sample_rate * 113 st->codec->bits_per_coded_sample * 114 st->codec->channels; 115 st->codec->block_align = st->codec->bits_per_coded_sample * 116 st->codec->channels / 8; 117 118 av_set_pts_info(st, 64, 1, st->codec->sample_rate); 119 120 return 0; 121} 122 123#define SOX_SAMPLES 1024 124 125static int sox_read_packet(AVFormatContext *s, 126 AVPacket *pkt) 127{ 128 int ret, size; 129 130 if (url_feof(s->pb)) 131 return AVERROR_EOF; 132 133 size = SOX_SAMPLES*s->streams[0]->codec->block_align; 134 ret = av_get_packet(s->pb, pkt, size); 135 if (ret < 0) 136 return AVERROR(EIO); 137 pkt->stream_index = 0; 138 pkt->size = ret; 139 140 return 0; 141} 142 143AVInputFormat sox_demuxer = { 144 "sox", 145 NULL_IF_CONFIG_SMALL("SoX native format"), 146 0, 147 sox_probe, 148 sox_read_header, 149 sox_read_packet, 150 NULL, 151 pcm_read_seek, 152}; 153