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1 | /* |
2 | * Creative Voice File demuxer. | |
3 | * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> | |
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/intreadwrite.h" | |
23 | #include "voc.h" | |
24 | #include "internal.h" | |
25 | ||
26 | ||
27 | static int voc_probe(AVProbeData *p) | |
28 | { | |
29 | int version, check; | |
30 | ||
31 | if (memcmp(p->buf, ff_voc_magic, sizeof(ff_voc_magic) - 1)) | |
32 | return 0; | |
33 | version = AV_RL16(p->buf + 22); | |
34 | check = AV_RL16(p->buf + 24); | |
35 | if (~version + 0x1234 != check) | |
36 | return 10; | |
37 | ||
38 | return AVPROBE_SCORE_MAX; | |
39 | } | |
40 | ||
41 | static int voc_read_header(AVFormatContext *s) | |
42 | { | |
43 | VocDecContext *voc = s->priv_data; | |
44 | AVIOContext *pb = s->pb; | |
45 | int header_size; | |
46 | AVStream *st; | |
47 | ||
48 | avio_skip(pb, 20); | |
49 | header_size = avio_rl16(pb) - 22; | |
50 | if (header_size != 4) { | |
51 | av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size); | |
52 | return AVERROR(ENOSYS); | |
53 | } | |
54 | avio_skip(pb, header_size); | |
55 | st = avformat_new_stream(s, NULL); | |
56 | if (!st) | |
57 | return AVERROR(ENOMEM); | |
58 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
59 | ||
60 | voc->remaining_size = 0; | |
61 | return 0; | |
62 | } | |
63 | ||
64 | int | |
65 | ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size) | |
66 | { | |
67 | VocDecContext *voc = s->priv_data; | |
68 | AVCodecContext *dec = st->codec; | |
69 | AVIOContext *pb = s->pb; | |
70 | VocType type; | |
71 | int size, tmp_codec=-1; | |
72 | int sample_rate = 0; | |
73 | int channels = 1; | |
74 | ||
75 | while (!voc->remaining_size) { | |
76 | type = avio_r8(pb); | |
77 | if (type == VOC_TYPE_EOF) | |
78 | return AVERROR_EOF; | |
79 | voc->remaining_size = avio_rl24(pb); | |
80 | if (!voc->remaining_size) { | |
81 | if (!s->pb->seekable) | |
82 | return AVERROR(EIO); | |
83 | voc->remaining_size = avio_size(pb) - avio_tell(pb); | |
84 | } | |
85 | max_size -= 4; | |
86 | ||
87 | switch (type) { | |
88 | case VOC_TYPE_VOICE_DATA: | |
89 | if (!dec->sample_rate) { | |
90 | dec->sample_rate = 1000000 / (256 - avio_r8(pb)); | |
91 | if (sample_rate) | |
92 | dec->sample_rate = sample_rate; | |
93 | avpriv_set_pts_info(st, 64, 1, dec->sample_rate); | |
94 | dec->channels = channels; | |
95 | dec->bits_per_coded_sample = av_get_bits_per_sample(dec->codec_id); | |
96 | } else | |
97 | avio_skip(pb, 1); | |
98 | tmp_codec = avio_r8(pb); | |
99 | voc->remaining_size -= 2; | |
100 | max_size -= 2; | |
101 | channels = 1; | |
102 | break; | |
103 | ||
104 | case VOC_TYPE_VOICE_DATA_CONT: | |
105 | break; | |
106 | ||
107 | case VOC_TYPE_EXTENDED: | |
108 | sample_rate = avio_rl16(pb); | |
109 | avio_r8(pb); | |
110 | channels = avio_r8(pb) + 1; | |
111 | sample_rate = 256000000 / (channels * (65536 - sample_rate)); | |
112 | voc->remaining_size = 0; | |
113 | max_size -= 4; | |
114 | break; | |
115 | ||
116 | case VOC_TYPE_NEW_VOICE_DATA: | |
117 | if (!dec->sample_rate) { | |
118 | dec->sample_rate = avio_rl32(pb); | |
119 | avpriv_set_pts_info(st, 64, 1, dec->sample_rate); | |
120 | dec->bits_per_coded_sample = avio_r8(pb); | |
121 | dec->channels = avio_r8(pb); | |
122 | } else | |
123 | avio_skip(pb, 6); | |
124 | tmp_codec = avio_rl16(pb); | |
125 | avio_skip(pb, 4); | |
126 | voc->remaining_size -= 12; | |
127 | max_size -= 12; | |
128 | break; | |
129 | ||
130 | default: | |
131 | avio_skip(pb, voc->remaining_size); | |
132 | max_size -= voc->remaining_size; | |
133 | voc->remaining_size = 0; | |
134 | break; | |
135 | } | |
136 | } | |
137 | ||
138 | if (tmp_codec >= 0) { | |
139 | tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec); | |
140 | if (dec->codec_id == AV_CODEC_ID_NONE) | |
141 | dec->codec_id = tmp_codec; | |
142 | else if (dec->codec_id != tmp_codec) | |
143 | av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n"); | |
144 | if (dec->codec_id == AV_CODEC_ID_NONE) { | |
145 | if (s->audio_codec_id == AV_CODEC_ID_NONE) { | |
146 | av_log(s, AV_LOG_ERROR, "unknown codec tag\n"); | |
147 | return AVERROR(EINVAL); | |
148 | } | |
149 | av_log(s, AV_LOG_WARNING, "unknown codec tag\n"); | |
150 | } | |
151 | } | |
152 | ||
153 | dec->bit_rate = dec->sample_rate * dec->channels * dec->bits_per_coded_sample; | |
154 | ||
155 | if (max_size <= 0) | |
156 | max_size = 2048; | |
157 | size = FFMIN(voc->remaining_size, max_size); | |
158 | voc->remaining_size -= size; | |
159 | return av_get_packet(pb, pkt, size); | |
160 | } | |
161 | ||
162 | static int voc_read_packet(AVFormatContext *s, AVPacket *pkt) | |
163 | { | |
164 | return ff_voc_get_packet(s, pkt, s->streams[0], 0); | |
165 | } | |
166 | ||
167 | AVInputFormat ff_voc_demuxer = { | |
168 | .name = "voc", | |
169 | .long_name = NULL_IF_CONFIG_SMALL("Creative Voice"), | |
170 | .priv_data_size = sizeof(VocDecContext), | |
171 | .read_probe = voc_probe, | |
172 | .read_header = voc_read_header, | |
173 | .read_packet = voc_read_packet, | |
174 | .codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 }, | |
175 | }; |