blob: 6e00692e269cdb1d8ce2d8eec1764c7c65b8c2d0
1 | /* |
2 | * Tiertex Limited SEQ File Demuxer |
3 | * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net) |
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 | /** |
23 | * @file |
24 | * Tiertex Limited SEQ file demuxer |
25 | */ |
26 | |
27 | #include "libavutil/channel_layout.h" |
28 | #include "avformat.h" |
29 | #include "internal.h" |
30 | |
31 | #define SEQ_FRAME_SIZE 6144 |
32 | #define SEQ_FRAME_W 256 |
33 | #define SEQ_FRAME_H 128 |
34 | #define SEQ_NUM_FRAME_BUFFERS 30 |
35 | #define SEQ_AUDIO_BUFFER_SIZE 882 |
36 | #define SEQ_SAMPLE_RATE 22050 |
37 | #define SEQ_FRAME_RATE 25 |
38 | |
39 | |
40 | typedef struct TiertexSeqFrameBuffer { |
41 | int fill_size; |
42 | int data_size; |
43 | unsigned char *data; |
44 | } TiertexSeqFrameBuffer; |
45 | |
46 | typedef struct SeqDemuxContext { |
47 | int audio_stream_index; |
48 | int video_stream_index; |
49 | int current_frame_pts; |
50 | int current_frame_offs; |
51 | TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS]; |
52 | int frame_buffers_count; |
53 | unsigned int current_audio_data_size; |
54 | unsigned int current_audio_data_offs; |
55 | unsigned int current_pal_data_size; |
56 | unsigned int current_pal_data_offs; |
57 | unsigned int current_video_data_size; |
58 | unsigned char *current_video_data_ptr; |
59 | int audio_buffer_full; |
60 | } SeqDemuxContext; |
61 | |
62 | |
63 | static int seq_probe(AVProbeData *p) |
64 | { |
65 | int i; |
66 | |
67 | if (p->buf_size < 258) |
68 | return 0; |
69 | |
70 | /* there's no real header in a .seq file, the only thing they have in common */ |
71 | /* is the first 256 bytes of the file which are always filled with 0 */ |
72 | for (i = 0; i < 256; i++) |
73 | if (p->buf[i]) |
74 | return 0; |
75 | |
76 | if(p->buf[256]==0 && p->buf[257]==0) |
77 | return 0; |
78 | |
79 | /* only one fourth of the score since the previous check is too naive */ |
80 | return AVPROBE_SCORE_MAX / 4; |
81 | } |
82 | |
83 | static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb) |
84 | { |
85 | int i, sz; |
86 | TiertexSeqFrameBuffer *seq_buffer; |
87 | |
88 | avio_seek(pb, 256, SEEK_SET); |
89 | |
90 | for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) { |
91 | sz = avio_rl16(pb); |
92 | if (sz == 0) |
93 | break; |
94 | else { |
95 | seq_buffer = &seq->frame_buffers[i]; |
96 | seq_buffer->fill_size = 0; |
97 | seq_buffer->data_size = sz; |
98 | seq_buffer->data = av_malloc(sz); |
99 | if (!seq_buffer->data) |
100 | return AVERROR(ENOMEM); |
101 | } |
102 | } |
103 | seq->frame_buffers_count = i; |
104 | return 0; |
105 | } |
106 | |
107 | static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size) |
108 | { |
109 | TiertexSeqFrameBuffer *seq_buffer; |
110 | |
111 | if (buffer_num >= SEQ_NUM_FRAME_BUFFERS) |
112 | return AVERROR_INVALIDDATA; |
113 | |
114 | seq_buffer = &seq->frame_buffers[buffer_num]; |
115 | if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0) |
116 | return AVERROR_INVALIDDATA; |
117 | |
118 | avio_seek(pb, seq->current_frame_offs + data_offs, SEEK_SET); |
119 | if (avio_read(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size) |
120 | return AVERROR(EIO); |
121 | |
122 | seq_buffer->fill_size += data_size; |
123 | return 0; |
124 | } |
125 | |
126 | static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb) |
127 | { |
128 | unsigned int offset_table[4], buffer_num[4]; |
129 | TiertexSeqFrameBuffer *seq_buffer; |
130 | int i, e, err; |
131 | |
132 | seq->current_frame_offs += SEQ_FRAME_SIZE; |
133 | avio_seek(pb, seq->current_frame_offs, SEEK_SET); |
134 | |
135 | /* sound data */ |
136 | seq->current_audio_data_offs = avio_rl16(pb); |
137 | if (seq->current_audio_data_offs) { |
138 | seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2; |
139 | } else { |
140 | seq->current_audio_data_size = 0; |
141 | } |
142 | |
143 | /* palette data */ |
144 | seq->current_pal_data_offs = avio_rl16(pb); |
145 | if (seq->current_pal_data_offs) { |
146 | seq->current_pal_data_size = 768; |
147 | } else { |
148 | seq->current_pal_data_size = 0; |
149 | } |
150 | |
151 | /* video data */ |
152 | for (i = 0; i < 4; i++) |
153 | buffer_num[i] = avio_r8(pb); |
154 | |
155 | for (i = 0; i < 4; i++) |
156 | offset_table[i] = avio_rl16(pb); |
157 | |
158 | for (i = 0; i < 3; i++) { |
159 | if (offset_table[i]) { |
160 | for (e = i + 1; e < 3 && offset_table[e] == 0; e++); |
161 | err = seq_fill_buffer(seq, pb, buffer_num[1 + i], |
162 | offset_table[i], |
163 | offset_table[e] - offset_table[i]); |
164 | if (err) |
165 | return err; |
166 | } |
167 | } |
168 | |
169 | if (buffer_num[0] != 255) { |
170 | if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS) |
171 | return AVERROR_INVALIDDATA; |
172 | |
173 | seq_buffer = &seq->frame_buffers[buffer_num[0]]; |
174 | seq->current_video_data_size = seq_buffer->fill_size; |
175 | seq->current_video_data_ptr = seq_buffer->data; |
176 | seq_buffer->fill_size = 0; |
177 | } else { |
178 | seq->current_video_data_size = 0; |
179 | seq->current_video_data_ptr = 0; |
180 | } |
181 | |
182 | return 0; |
183 | } |
184 | |
185 | static int seq_read_header(AVFormatContext *s) |
186 | { |
187 | int i, rc; |
188 | SeqDemuxContext *seq = s->priv_data; |
189 | AVIOContext *pb = s->pb; |
190 | AVStream *st; |
191 | |
192 | /* init internal buffers */ |
193 | rc = seq_init_frame_buffers(seq, pb); |
194 | if (rc) |
195 | return rc; |
196 | |
197 | seq->current_frame_offs = 0; |
198 | |
199 | /* preload (no audio data, just buffer operations related data) */ |
200 | for (i = 1; i <= 100; i++) { |
201 | rc = seq_parse_frame_data(seq, pb); |
202 | if (rc) |
203 | return rc; |
204 | } |
205 | |
206 | seq->current_frame_pts = 0; |
207 | |
208 | seq->audio_buffer_full = 0; |
209 | |
210 | /* initialize the video decoder stream */ |
211 | st = avformat_new_stream(s, NULL); |
212 | if (!st) |
213 | return AVERROR(ENOMEM); |
214 | |
215 | avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE); |
216 | seq->video_stream_index = st->index; |
217 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
218 | st->codecpar->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO; |
219 | st->codecpar->codec_tag = 0; /* no fourcc */ |
220 | st->codecpar->width = SEQ_FRAME_W; |
221 | st->codecpar->height = SEQ_FRAME_H; |
222 | |
223 | /* initialize the audio decoder stream */ |
224 | st = avformat_new_stream(s, NULL); |
225 | if (!st) |
226 | return AVERROR(ENOMEM); |
227 | |
228 | st->start_time = 0; |
229 | avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE); |
230 | seq->audio_stream_index = st->index; |
231 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
232 | st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE; |
233 | st->codecpar->codec_tag = 0; /* no tag */ |
234 | st->codecpar->channels = 1; |
235 | st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
236 | st->codecpar->sample_rate = SEQ_SAMPLE_RATE; |
237 | st->codecpar->bits_per_coded_sample = 16; |
238 | st->codecpar->bit_rate = st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample * st->codecpar->channels; |
239 | st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample / 8; |
240 | |
241 | return 0; |
242 | } |
243 | |
244 | static int seq_read_packet(AVFormatContext *s, AVPacket *pkt) |
245 | { |
246 | int rc; |
247 | SeqDemuxContext *seq = s->priv_data; |
248 | AVIOContext *pb = s->pb; |
249 | |
250 | if (!seq->audio_buffer_full) { |
251 | rc = seq_parse_frame_data(seq, pb); |
252 | if (rc) |
253 | return rc; |
254 | |
255 | /* video packet */ |
256 | if (seq->current_pal_data_size + seq->current_video_data_size != 0) { |
257 | if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size)) |
258 | return AVERROR(ENOMEM); |
259 | |
260 | pkt->data[0] = 0; |
261 | if (seq->current_pal_data_size) { |
262 | pkt->data[0] |= 1; |
263 | avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET); |
264 | if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size) |
265 | return AVERROR(EIO); |
266 | } |
267 | if (seq->current_video_data_size) { |
268 | pkt->data[0] |= 2; |
269 | memcpy(&pkt->data[1 + seq->current_pal_data_size], |
270 | seq->current_video_data_ptr, |
271 | seq->current_video_data_size); |
272 | } |
273 | pkt->stream_index = seq->video_stream_index; |
274 | pkt->pts = seq->current_frame_pts; |
275 | |
276 | /* sound buffer will be processed on next read_packet() call */ |
277 | seq->audio_buffer_full = 1; |
278 | return 0; |
279 | } |
280 | } |
281 | |
282 | /* audio packet */ |
283 | if (seq->current_audio_data_offs == 0) /* end of data reached */ |
284 | return AVERROR(EIO); |
285 | |
286 | avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET); |
287 | rc = av_get_packet(pb, pkt, seq->current_audio_data_size); |
288 | if (rc < 0) |
289 | return rc; |
290 | |
291 | pkt->stream_index = seq->audio_stream_index; |
292 | seq->current_frame_pts++; |
293 | |
294 | seq->audio_buffer_full = 0; |
295 | return 0; |
296 | } |
297 | |
298 | static int seq_read_close(AVFormatContext *s) |
299 | { |
300 | int i; |
301 | SeqDemuxContext *seq = s->priv_data; |
302 | |
303 | for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) |
304 | av_freep(&seq->frame_buffers[i].data); |
305 | |
306 | return 0; |
307 | } |
308 | |
309 | AVInputFormat ff_tiertexseq_demuxer = { |
310 | .name = "tiertexseq", |
311 | .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"), |
312 | .priv_data_size = sizeof(SeqDemuxContext), |
313 | .read_probe = seq_probe, |
314 | .read_header = seq_read_header, |
315 | .read_packet = seq_read_packet, |
316 | .read_close = seq_read_close, |
317 | }; |
318 |