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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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
218 | st->codec->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO; | |
219 | st->codec->codec_tag = 0; /* no fourcc */ | |
220 | st->codec->width = SEQ_FRAME_W; | |
221 | st->codec->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->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
232 | st->codec->codec_id = AV_CODEC_ID_PCM_S16BE; | |
233 | st->codec->codec_tag = 0; /* no tag */ | |
234 | st->codec->channels = 1; | |
235 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
236 | st->codec->sample_rate = SEQ_SAMPLE_RATE; | |
237 | st->codec->bits_per_coded_sample = 16; | |
238 | st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels; | |
239 | st->codec->block_align = st->codec->channels * st->codec->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++) | |
f6fa7814 | 304 | av_freep(&seq->frame_buffers[i].data); |
2ba45a60 DM |
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 | }; |