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2ba45a60 DM |
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 | }; |