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
seq_probe(const AVProbeData * p)63 static int seq_probe(const 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
seq_init_frame_buffers(SeqDemuxContext * seq,AVIOContext * pb)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
seq_fill_buffer(SeqDemuxContext * seq,AVIOContext * pb,int buffer_num,unsigned int data_offs,int data_size)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
seq_parse_frame_data(SeqDemuxContext * seq,AVIOContext * pb)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
seq_read_close(AVFormatContext * s)185 static int seq_read_close(AVFormatContext *s)
186 {
187 int i;
188 SeqDemuxContext *seq = s->priv_data;
189
190 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
191 av_freep(&seq->frame_buffers[i].data);
192
193 return 0;
194 }
195
seq_read_header(AVFormatContext * s)196 static int seq_read_header(AVFormatContext *s)
197 {
198 int i, rc;
199 SeqDemuxContext *seq = s->priv_data;
200 AVIOContext *pb = s->pb;
201 AVStream *st;
202
203 /* init internal buffers */
204 rc = seq_init_frame_buffers(seq, pb);
205 if (rc < 0)
206 return rc;
207
208 seq->current_frame_offs = 0;
209
210 /* preload (no audio data, just buffer operations related data) */
211 for (i = 1; i <= 100; i++) {
212 rc = seq_parse_frame_data(seq, pb);
213 if (rc < 0)
214 return rc;
215 }
216
217 seq->current_frame_pts = 0;
218
219 seq->audio_buffer_full = 0;
220
221 /* initialize the video decoder stream */
222 st = avformat_new_stream(s, NULL);
223 if (!st)
224 return AVERROR(ENOMEM);
225
226 avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
227 seq->video_stream_index = st->index;
228 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
229 st->codecpar->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO;
230 st->codecpar->codec_tag = 0; /* no fourcc */
231 st->codecpar->width = SEQ_FRAME_W;
232 st->codecpar->height = SEQ_FRAME_H;
233
234 /* initialize the audio decoder stream */
235 st = avformat_new_stream(s, NULL);
236 if (!st)
237 return AVERROR(ENOMEM);
238
239 st->start_time = 0;
240 avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
241 seq->audio_stream_index = st->index;
242 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
243 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
244 st->codecpar->codec_tag = 0; /* no tag */
245 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
246 st->codecpar->sample_rate = SEQ_SAMPLE_RATE;
247 st->codecpar->bits_per_coded_sample = 16;
248 st->codecpar->bit_rate = st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample * st->codecpar->ch_layout.nb_channels;
249 st->codecpar->block_align = st->codecpar->ch_layout.nb_channels * st->codecpar->bits_per_coded_sample / 8;
250
251 return 0;
252 }
253
seq_read_packet(AVFormatContext * s,AVPacket * pkt)254 static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
255 {
256 int rc;
257 SeqDemuxContext *seq = s->priv_data;
258 AVIOContext *pb = s->pb;
259
260 if (!seq->audio_buffer_full) {
261 rc = seq_parse_frame_data(seq, pb);
262 if (rc)
263 return rc;
264
265 /* video packet */
266 if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
267 rc = av_new_packet(pkt, 1 + seq->current_pal_data_size
268 + seq->current_video_data_size);
269 if (rc < 0)
270 return rc;
271
272 pkt->data[0] = 0;
273 if (seq->current_pal_data_size) {
274 pkt->data[0] |= 1;
275 avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
276 if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
277 return AVERROR(EIO);
278 }
279 if (seq->current_video_data_size) {
280 pkt->data[0] |= 2;
281 memcpy(&pkt->data[1 + seq->current_pal_data_size],
282 seq->current_video_data_ptr,
283 seq->current_video_data_size);
284 }
285 pkt->stream_index = seq->video_stream_index;
286 pkt->pts = seq->current_frame_pts;
287
288 /* sound buffer will be processed on next read_packet() call */
289 seq->audio_buffer_full = 1;
290 return 0;
291 }
292 }
293
294 /* audio packet */
295 if (seq->current_audio_data_offs == 0) /* end of data reached */
296 return AVERROR(EIO);
297
298 avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
299 rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
300 if (rc < 0)
301 return rc;
302
303 pkt->stream_index = seq->audio_stream_index;
304 seq->current_frame_pts++;
305
306 seq->audio_buffer_full = 0;
307 return 0;
308 }
309
310 const AVInputFormat ff_tiertexseq_demuxer = {
311 .name = "tiertexseq",
312 .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"),
313 .priv_data_size = sizeof(SeqDemuxContext),
314 .flags_internal = FF_FMT_INIT_CLEANUP,
315 .read_probe = seq_probe,
316 .read_header = seq_read_header,
317 .read_packet = seq_read_packet,
318 .read_close = seq_read_close,
319 };
320