blob: 12a94c8ffab9603f6708a281b233fda37f4a037e
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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
59 | |
60 | if (avio_rl32(pb) == SOX_TAG) { |
61 | st->codecpar->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->codecpar->channels = avio_rl32(pb); |
66 | comment_size = avio_rl32(pb); |
67 | } else { |
68 | st->codecpar->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->codecpar->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->codecpar->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->codecpar->sample_rate = sample_rate; |
115 | st->codecpar->bits_per_coded_sample = 32; |
116 | st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate * |
117 | st->codecpar->bits_per_coded_sample * |
118 | st->codecpar->channels; |
119 | st->codecpar->block_align = st->codecpar->bits_per_coded_sample * |
120 | st->codecpar->channels / 8; |
121 | |
122 | avpriv_set_pts_info(st, 64, 1, st->codecpar->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 | }; |
135 |