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 Libav. 9 * 10 * Libav 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 * Libav 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 Libav; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 23 */ 24 25/** 26 * @file 27 * SoX native format demuxer 28 * @author Daniel Verkamp 29 * @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format 30 */ 31 32#include "libavutil/intreadwrite.h" 33#include "libavutil/intfloat.h" 34#include "libavutil/dict.h" 35#include "avformat.h" 36#include "internal.h" 37#include "pcm.h" 38#include "sox.h" 39 40static int sox_probe(AVProbeData *p) 41{ 42 if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG) 43 return AVPROBE_SCORE_MAX; 44 return 0; 45} 46 47static int sox_read_header(AVFormatContext *s, 48 AVFormatParameters *ap) 49{ 50 AVIOContext *pb = s->pb; 51 unsigned header_size, comment_size; 52 double sample_rate, sample_rate_frac; 53 AVStream *st; 54 55 st = avformat_new_stream(s, NULL); 56 if (!st) 57 return AVERROR(ENOMEM); 58 59 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 60 61 if (avio_rl32(pb) == SOX_TAG) { 62 st->codec->codec_id = CODEC_ID_PCM_S32LE; 63 header_size = avio_rl32(pb); 64 avio_skip(pb, 8); /* sample count */ 65 sample_rate = av_int2double(avio_rl64(pb)); 66 st->codec->channels = avio_rl32(pb); 67 comment_size = avio_rl32(pb); 68 } else { 69 st->codec->codec_id = CODEC_ID_PCM_S32BE; 70 header_size = avio_rb32(pb); 71 avio_skip(pb, 8); /* sample count */ 72 sample_rate = av_int2double(avio_rb64(pb)); 73 st->codec->channels = avio_rb32(pb); 74 comment_size = avio_rb32(pb); 75 } 76 77 if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) { 78 av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size); 79 return -1; 80 } 81 82 if (sample_rate <= 0 || sample_rate > INT_MAX) { 83 av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate); 84 return -1; 85 } 86 87 sample_rate_frac = sample_rate - floor(sample_rate); 88 if (sample_rate_frac) 89 av_log(s, AV_LOG_WARNING, 90 "truncating fractional part of sample rate (%f)\n", 91 sample_rate_frac); 92 93 if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size 94 || st->codec->channels > 65535) /* Reserve top 16 bits */ { 95 av_log(s, AV_LOG_ERROR, "invalid header\n"); 96 return -1; 97 } 98 99 if (comment_size && comment_size < UINT_MAX) { 100 char *comment = av_malloc(comment_size+1); 101 if (avio_read(pb, comment, comment_size) != comment_size) { 102 av_freep(&comment); 103 return AVERROR(EIO); 104 } 105 comment[comment_size] = 0; 106 107 av_dict_set(&s->metadata, "comment", comment, 108 AV_DICT_DONT_STRDUP_VAL); 109 } 110 111 avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size); 112 113 st->codec->sample_rate = sample_rate; 114 st->codec->bits_per_coded_sample = 32; 115 st->codec->bit_rate = st->codec->sample_rate * 116 st->codec->bits_per_coded_sample * 117 st->codec->channels; 118 st->codec->block_align = st->codec->bits_per_coded_sample * 119 st->codec->channels / 8; 120 121 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); 122 123 return 0; 124} 125 126#define SOX_SAMPLES 1024 127 128static int sox_read_packet(AVFormatContext *s, 129 AVPacket *pkt) 130{ 131 int ret, size; 132 133 if (s->pb->eof_reached) 134 return AVERROR_EOF; 135 136 size = SOX_SAMPLES*s->streams[0]->codec->block_align; 137 ret = av_get_packet(s->pb, pkt, size); 138 if (ret < 0) 139 return AVERROR(EIO); 140 pkt->stream_index = 0; 141 pkt->size = ret; 142 143 return 0; 144} 145 146AVInputFormat ff_sox_demuxer = { 147 .name = "sox", 148 .long_name = NULL_IF_CONFIG_SMALL("SoX native format"), 149 .read_probe = sox_probe, 150 .read_header = sox_read_header, 151 .read_packet = sox_read_packet, 152 .read_seek = pcm_read_seek, 153}; 154