tls: Hide backend implementation details from users
[libav.git] / libavformat / siff.c
1 /*
2 * Beam Software SIFF demuxer
3 * Copyright (c) 2007 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24
25 #include "avformat.h"
26 #include "internal.h"
27
28 enum SIFFTags {
29 TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
30 TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
31 TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
32 TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
33 TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
34 TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
35 };
36
37 enum VBFlags {
38 VB_HAS_GMC = 0x01,
39 VB_HAS_AUDIO = 0x04,
40 VB_HAS_VIDEO = 0x08,
41 VB_HAS_PALETTE = 0x10,
42 VB_HAS_LENGTH = 0x20
43 };
44
45 typedef struct SIFFContext {
46 int frames;
47 int cur_frame;
48 int rate;
49 int bits;
50 int block_align;
51
52 int has_video;
53 int has_audio;
54
55 int curstrm;
56 unsigned int pktsize;
57 int gmcsize;
58 int sndsize;
59
60 unsigned int flags;
61 uint8_t gmc[4];
62 } SIFFContext;
63
64 static int siff_probe(AVProbeData *p)
65 {
66 uint32_t tag = AV_RL32(p->buf + 8);
67 /* check file header */
68 if (AV_RL32(p->buf) != TAG_SIFF ||
69 (tag != TAG_VBV1 && tag != TAG_SOUN))
70 return 0;
71 return AVPROBE_SCORE_MAX;
72 }
73
74 static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
75 {
76 AVStream *ast;
77 ast = avformat_new_stream(s, NULL);
78 if (!ast)
79 return AVERROR(ENOMEM);
80 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
81 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
82 ast->codecpar->channels = 1;
83 ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
84 ast->codecpar->bits_per_coded_sample = 8;
85 ast->codecpar->sample_rate = c->rate;
86 avpriv_set_pts_info(ast, 16, 1, c->rate);
87 ast->start_time = 0;
88 return 0;
89 }
90
91 static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
92 {
93 AVStream *st;
94 int width, height;
95
96 if (avio_rl32(pb) != TAG_VBHD) {
97 av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
98 return AVERROR_INVALIDDATA;
99 }
100 if (avio_rb32(pb) != 32) {
101 av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
102 return AVERROR_INVALIDDATA;
103 }
104 if (avio_rl16(pb) != 1) {
105 av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
106 return AVERROR_INVALIDDATA;
107 }
108 width = avio_rl16(pb);
109 height = avio_rl16(pb);
110 avio_skip(pb, 4);
111 c->frames = avio_rl16(pb);
112 if (!c->frames) {
113 av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
114 return AVERROR_INVALIDDATA;
115 }
116 c->bits = avio_rl16(pb);
117 c->rate = avio_rl16(pb);
118 c->block_align = c->rate * (c->bits >> 3);
119
120 avio_skip(pb, 16); // zeroes
121
122 st = avformat_new_stream(s, NULL);
123 if (!st)
124 return AVERROR(ENOMEM);
125 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
126 st->codecpar->codec_id = AV_CODEC_ID_VB;
127 st->codecpar->codec_tag = MKTAG('V', 'B', 'V', '1');
128 st->codecpar->width = width;
129 st->codecpar->height = height;
130 st->codecpar->format = AV_PIX_FMT_PAL8;
131 avpriv_set_pts_info(st, 16, 1, 12);
132
133 c->cur_frame = 0;
134 c->has_video = 1;
135 c->has_audio = !!c->rate;
136 c->curstrm = -1;
137 if (c->has_audio)
138 return create_audio_stream(s, c);
139 return 0;
140 }
141
142 static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
143 {
144 if (avio_rl32(pb) != TAG_SHDR) {
145 av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
146 return AVERROR_INVALIDDATA;
147 }
148 if (avio_rb32(pb) != 8) {
149 av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
150 return AVERROR_INVALIDDATA;
151 }
152 avio_skip(pb, 4); // unknown value
153 c->rate = avio_rl16(pb);
154 c->bits = avio_rl16(pb);
155 c->block_align = c->rate * (c->bits >> 3);
156 return create_audio_stream(s, c);
157 }
158
159 static int siff_read_header(AVFormatContext *s)
160 {
161 AVIOContext *pb = s->pb;
162 SIFFContext *c = s->priv_data;
163 uint32_t tag;
164 int ret;
165
166 if (avio_rl32(pb) != TAG_SIFF)
167 return AVERROR_INVALIDDATA;
168 avio_skip(pb, 4); // ignore size
169 tag = avio_rl32(pb);
170
171 if (tag != TAG_VBV1 && tag != TAG_SOUN) {
172 av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
173 return AVERROR_INVALIDDATA;
174 }
175
176 if (tag == TAG_VBV1 && (ret = siff_parse_vbv1(s, c, pb)) < 0)
177 return ret;
178 if (tag == TAG_SOUN && (ret = siff_parse_soun(s, c, pb)) < 0)
179 return ret;
180 if (avio_rl32(pb) != MKTAG('B', 'O', 'D', 'Y')) {
181 av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
182 return AVERROR_INVALIDDATA;
183 }
184 avio_skip(pb, 4); // ignore size
185
186 return 0;
187 }
188
189 static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
190 {
191 SIFFContext *c = s->priv_data;
192
193 if (c->has_video) {
194 unsigned int size;
195 if (c->cur_frame >= c->frames)
196 return AVERROR(EIO);
197 if (c->curstrm == -1) {
198 c->pktsize = avio_rl32(s->pb) - 4;
199 c->flags = avio_rl16(s->pb);
200 c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
201 if (c->gmcsize)
202 avio_read(s->pb, c->gmc, c->gmcsize);
203 c->sndsize = (c->flags & VB_HAS_AUDIO) ? avio_rl32(s->pb) : 0;
204 c->curstrm = !!(c->flags & VB_HAS_AUDIO);
205 }
206
207 if (!c->curstrm) {
208 size = c->pktsize - c->sndsize;
209 if (av_new_packet(pkt, size) < 0)
210 return AVERROR(ENOMEM);
211 AV_WL16(pkt->data, c->flags);
212 if (c->gmcsize)
213 memcpy(pkt->data + 2, c->gmc, c->gmcsize);
214 avio_read(s->pb, pkt->data + 2 + c->gmcsize, size - c->gmcsize - 2);
215 pkt->stream_index = 0;
216 c->curstrm = -1;
217 } else {
218 int pktsize = av_get_packet(s->pb, pkt, c->sndsize - 4);
219 if (pktsize < 0)
220 return AVERROR(EIO);
221 pkt->stream_index = 1;
222 pkt->duration = pktsize;
223 c->curstrm = 0;
224 }
225 if (!c->cur_frame || c->curstrm)
226 pkt->flags |= AV_PKT_FLAG_KEY;
227 if (c->curstrm == -1)
228 c->cur_frame++;
229 } else {
230 int pktsize = av_get_packet(s->pb, pkt, c->block_align);
231 if (pktsize <= 0)
232 return AVERROR(EIO);
233 pkt->duration = pktsize;
234 }
235 return pkt->size;
236 }
237
238 AVInputFormat ff_siff_demuxer = {
239 .name = "siff",
240 .long_name = NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
241 .priv_data_size = sizeof(SIFFContext),
242 .read_probe = siff_probe,
243 .read_header = siff_read_header,
244 .read_packet = siff_read_packet,
245 .extensions = "vb,son",
246 };