| 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 | * @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 | |
| 40 | static 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 | |
| 47 | static int sox_read_header(AVFormatContext *s) |
| 48 | { |
| 49 | AVIOContext *pb = s->pb; |
| 50 | unsigned header_size, comment_size; |
| 51 | double sample_rate, sample_rate_frac; |
| 52 | AVStream *st; |
| 53 | |
| 54 | st = avformat_new_stream(s, NULL); |
| 55 | if (!st) |
| 56 | return AVERROR(ENOMEM); |
| 57 | |
| 58 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 59 | |
| 60 | if (avio_rl32(pb) == SOX_TAG) { |
| 61 | st->codec->codec_id = AV_CODEC_ID_PCM_S32LE; |
| 62 | header_size = avio_rl32(pb); |
| 63 | avio_skip(pb, 8); /* sample count */ |
| 64 | sample_rate = av_int2double(avio_rl64(pb)); |
| 65 | st->codec->channels = avio_rl32(pb); |
| 66 | comment_size = avio_rl32(pb); |
| 67 | } else { |
| 68 | st->codec->codec_id = AV_CODEC_ID_PCM_S32BE; |
| 69 | header_size = avio_rb32(pb); |
| 70 | avio_skip(pb, 8); /* sample count */ |
| 71 | sample_rate = av_int2double(avio_rb64(pb)); |
| 72 | st->codec->channels = avio_rb32(pb); |
| 73 | comment_size = avio_rb32(pb); |
| 74 | } |
| 75 | |
| 76 | if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) { |
| 77 | av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size); |
| 78 | return AVERROR_INVALIDDATA; |
| 79 | } |
| 80 | |
| 81 | if (sample_rate <= 0 || sample_rate > INT_MAX) { |
| 82 | av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate); |
| 83 | return AVERROR_INVALIDDATA; |
| 84 | } |
| 85 | |
| 86 | sample_rate_frac = sample_rate - floor(sample_rate); |
| 87 | if (sample_rate_frac) |
| 88 | av_log(s, AV_LOG_WARNING, |
| 89 | "truncating fractional part of sample rate (%f)\n", |
| 90 | sample_rate_frac); |
| 91 | |
| 92 | if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size |
| 93 | || st->codec->channels > 65535) /* Reserve top 16 bits */ { |
| 94 | av_log(s, AV_LOG_ERROR, "invalid header\n"); |
| 95 | return AVERROR_INVALIDDATA; |
| 96 | } |
| 97 | |
| 98 | if (comment_size && comment_size < UINT_MAX) { |
| 99 | char *comment = av_malloc(comment_size+1); |
| 100 | if(!comment) |
| 101 | return AVERROR(ENOMEM); |
| 102 | if (avio_read(pb, comment, comment_size) != comment_size) { |
| 103 | av_freep(&comment); |
| 104 | return AVERROR(EIO); |
| 105 | } |
| 106 | comment[comment_size] = 0; |
| 107 | |
| 108 | av_dict_set(&s->metadata, "comment", comment, |
| 109 | AV_DICT_DONT_STRDUP_VAL); |
| 110 | } |
| 111 | |
| 112 | avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size); |
| 113 | |
| 114 | st->codec->sample_rate = sample_rate; |
| 115 | st->codec->bits_per_coded_sample = 32; |
| 116 | st->codec->bit_rate = st->codec->sample_rate * |
| 117 | st->codec->bits_per_coded_sample * |
| 118 | st->codec->channels; |
| 119 | st->codec->block_align = st->codec->bits_per_coded_sample * |
| 120 | st->codec->channels / 8; |
| 121 | |
| 122 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | AVInputFormat ff_sox_demuxer = { |
| 128 | .name = "sox", |
| 129 | .long_name = NULL_IF_CONFIG_SMALL("SoX native"), |
| 130 | .read_probe = sox_probe, |
| 131 | .read_header = sox_read_header, |
| 132 | .read_packet = ff_pcm_read_packet, |
| 133 | .read_seek = ff_pcm_read_seek, |
| 134 | }; |