Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * NIST Sphere demuxer | |
3 | * Copyright (c) 2012 Paul B Mahol | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "libavutil/avstring.h" | |
23 | #include "libavutil/intreadwrite.h" | |
24 | #include "avformat.h" | |
25 | #include "internal.h" | |
26 | #include "pcm.h" | |
27 | ||
28 | static int nist_probe(AVProbeData *p) | |
29 | { | |
30 | if (AV_RL64(p->buf) == AV_RL64("NIST_1A\x0a")) | |
31 | return AVPROBE_SCORE_MAX; | |
32 | return 0; | |
33 | } | |
34 | ||
35 | static int nist_read_header(AVFormatContext *s) | |
36 | { | |
37 | char buffer[32], coding[32] = "pcm", format[32] = "01"; | |
38 | int bps = 0, be = 0; | |
39 | int32_t header_size = -1; | |
40 | AVStream *st; | |
41 | ||
42 | st = avformat_new_stream(s, NULL); | |
43 | if (!st) | |
44 | return AVERROR(ENOMEM); | |
45 | ||
46 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
47 | ||
48 | ff_get_line(s->pb, buffer, sizeof(buffer)); | |
49 | ff_get_line(s->pb, buffer, sizeof(buffer)); | |
50 | sscanf(buffer, "%"SCNd32, &header_size); | |
51 | if (header_size <= 0) | |
52 | return AVERROR_INVALIDDATA; | |
53 | ||
54 | while (!avio_feof(s->pb)) { | |
55 | ff_get_line(s->pb, buffer, sizeof(buffer)); | |
56 | ||
57 | if (avio_tell(s->pb) >= header_size) | |
58 | return AVERROR_INVALIDDATA; | |
59 | ||
60 | if (!memcmp(buffer, "end_head", 8)) { | |
61 | if (!st->codec->bits_per_coded_sample) | |
62 | st->codec->bits_per_coded_sample = bps << 3; | |
63 | ||
64 | if (!av_strcasecmp(coding, "pcm")) { | |
65 | st->codec->codec_id = ff_get_pcm_codec_id(st->codec->bits_per_coded_sample, | |
66 | 0, be, 0xFFFF); | |
67 | } else if (!av_strcasecmp(coding, "alaw")) { | |
68 | st->codec->codec_id = AV_CODEC_ID_PCM_ALAW; | |
69 | } else if (!av_strcasecmp(coding, "ulaw") || | |
70 | !av_strcasecmp(coding, "mu-law")) { | |
71 | st->codec->codec_id = AV_CODEC_ID_PCM_MULAW; | |
72 | } else { | |
73 | avpriv_request_sample(s, "coding %s", coding); | |
74 | } | |
75 | ||
76 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
77 | ||
78 | st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8; | |
79 | ||
80 | if (avio_tell(s->pb) > header_size) | |
81 | return AVERROR_INVALIDDATA; | |
82 | ||
83 | avio_skip(s->pb, header_size - avio_tell(s->pb)); | |
84 | ||
85 | return 0; | |
86 | } else if (!memcmp(buffer, "channel_count", 13)) { | |
87 | sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->channels); | |
88 | } else if (!memcmp(buffer, "sample_byte_format", 18)) { | |
89 | sscanf(buffer, "%*s %*s %31s", format); | |
90 | ||
91 | if (!av_strcasecmp(format, "01")) { | |
92 | be = 0; | |
93 | } else if (!av_strcasecmp(format, "10")) { | |
94 | be = 1; | |
95 | } else if (av_strcasecmp(format, "1")) { | |
96 | avpriv_request_sample(s, "sample byte format %s", format); | |
97 | return AVERROR_PATCHWELCOME; | |
98 | } | |
99 | } else if (!memcmp(buffer, "sample_coding", 13)) { | |
100 | sscanf(buffer, "%*s %*s %31s", coding); | |
101 | } else if (!memcmp(buffer, "sample_count", 12)) { | |
102 | sscanf(buffer, "%*s %*s %"SCNd64, &st->duration); | |
103 | } else if (!memcmp(buffer, "sample_n_bytes", 14)) { | |
104 | sscanf(buffer, "%*s %*s %"SCNd32, &bps); | |
105 | } else if (!memcmp(buffer, "sample_rate", 11)) { | |
106 | sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->sample_rate); | |
107 | } else if (!memcmp(buffer, "sample_sig_bits", 15)) { | |
108 | sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->bits_per_coded_sample); | |
109 | } else { | |
110 | char key[32], value[32]; | |
111 | if (sscanf(buffer, "%31s %*s %31s", key, value) == 3) { | |
112 | av_dict_set(&s->metadata, key, value, AV_DICT_APPEND); | |
113 | } else { | |
114 | av_log(s, AV_LOG_ERROR, "Failed to parse '%s' as metadata\n", buffer); | |
115 | } | |
116 | } | |
117 | } | |
118 | ||
119 | return AVERROR_EOF; | |
120 | } | |
121 | ||
122 | AVInputFormat ff_nistsphere_demuxer = { | |
123 | .name = "nistsphere", | |
124 | .long_name = NULL_IF_CONFIG_SMALL("NIST SPeech HEader REsources"), | |
125 | .read_probe = nist_probe, | |
126 | .read_header = nist_read_header, | |
127 | .read_packet = ff_pcm_read_packet, | |
128 | .read_seek = ff_pcm_read_seek, | |
129 | .extensions = "nist,sph", | |
130 | .flags = AVFMT_GENERIC_INDEX, | |
131 | }; |