Do not read from after the table, fixes CID108 RUN2.
[libav.git] / libavformat / tiertexseq.c
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 tiertexseq.c
24 * Tiertex Limited SEQ file demuxer
25 */
26
27 #include "avformat.h"
28
29 #define SEQ_FRAME_SIZE 6144
30 #define SEQ_FRAME_W 256
31 #define SEQ_FRAME_H 128
32 #define SEQ_NUM_FRAME_BUFFERS 30
33 #define SEQ_AUDIO_BUFFER_SIZE 882
34 #define SEQ_SAMPLE_RATE 22050
35 #define SEQ_FRAME_RATE 25
36
37
38 typedef struct TiertexSeqFrameBuffer {
39 int fill_size;
40 int data_size;
41 unsigned char *data;
42 } TiertexSeqFrameBuffer;
43
44 typedef struct SeqDemuxContext {
45 int audio_stream_index;
46 int video_stream_index;
47 int current_frame_pts;
48 int current_frame_offs;
49 TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS];
50 int frame_buffers_count;
51 unsigned int current_audio_data_size;
52 unsigned int current_audio_data_offs;
53 unsigned int current_pal_data_size;
54 unsigned int current_pal_data_offs;
55 unsigned int current_video_data_size;
56 unsigned char *current_video_data_ptr;
57 int audio_buffer_full;
58 } SeqDemuxContext;
59
60
61 static int seq_probe(AVProbeData *p)
62 {
63 int i;
64
65 if (p->buf_size < 258)
66 return 0;
67
68 /* there's no real header in a .seq file, the only thing they have in common */
69 /* is the first 256 bytes of the file which are always filled with 0 */
70 for (i = 0; i < 256; i++)
71 if (p->buf[i] != 0)
72 return 0;
73
74 if(p->buf[256]==0 && p->buf[257]==0)
75 return 0;
76
77 /* only one fourth of the score since the previous check is too naive */
78 return AVPROBE_SCORE_MAX / 4;
79 }
80
81 static int seq_init_frame_buffers(SeqDemuxContext *seq, ByteIOContext *pb)
82 {
83 int i, sz;
84 TiertexSeqFrameBuffer *seq_buffer;
85
86 url_fseek(pb, 256, SEEK_SET);
87
88 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
89 sz = get_le16(pb);
90 if (sz == 0)
91 break;
92 else {
93 seq_buffer = &seq->frame_buffers[i];
94 seq_buffer->fill_size = 0;
95 seq_buffer->data_size = sz;
96 seq_buffer->data = av_malloc(sz);
97 if (!seq_buffer->data)
98 return AVERROR(ENOMEM);
99 }
100 }
101 seq->frame_buffers_count = i;
102 return 0;
103 }
104
105 static int seq_fill_buffer(SeqDemuxContext *seq, ByteIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
106 {
107 TiertexSeqFrameBuffer *seq_buffer;
108
109 if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
110 return AVERROR_INVALIDDATA;
111
112 seq_buffer = &seq->frame_buffers[buffer_num];
113 if (seq_buffer->fill_size + data_size > seq_buffer->data_size)
114 return AVERROR_INVALIDDATA;
115
116 url_fseek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
117 if (get_buffer(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
118 return AVERROR(EIO);
119
120 seq_buffer->fill_size += data_size;
121 return 0;
122 }
123
124 static int seq_parse_frame_data(SeqDemuxContext *seq, ByteIOContext *pb)
125 {
126 unsigned int offset_table[4], buffer_num[4];
127 TiertexSeqFrameBuffer *seq_buffer;
128 int i, e, err;
129
130 seq->current_frame_offs += SEQ_FRAME_SIZE;
131 url_fseek(pb, seq->current_frame_offs, SEEK_SET);
132
133 /* sound data */
134 seq->current_audio_data_offs = get_le16(pb);
135 if (seq->current_audio_data_offs != 0) {
136 seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
137 } else {
138 seq->current_audio_data_size = 0;
139 }
140
141 /* palette data */
142 seq->current_pal_data_offs = get_le16(pb);
143 if (seq->current_pal_data_offs != 0) {
144 seq->current_pal_data_size = 768;
145 } else {
146 seq->current_pal_data_size = 0;
147 }
148
149 /* video data */
150 for (i = 0; i < 4; i++)
151 buffer_num[i] = get_byte(pb);
152
153 for (i = 0; i < 4; i++)
154 offset_table[i] = get_le16(pb);
155
156 for (i = 0; i < 3; i++) {
157 if (offset_table[i] != 0) {
158 for (e = i + 1; e < 3 && offset_table[e] == 0; e++);
159 err = seq_fill_buffer(seq, pb, buffer_num[1 + i],
160 offset_table[i],
161 offset_table[e] - offset_table[i]);
162 if (err != 0)
163 return err;
164 }
165 }
166
167 if (buffer_num[0] != 255) {
168 if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
169 return AVERROR_INVALIDDATA;
170
171 seq_buffer = &seq->frame_buffers[buffer_num[0]];
172 seq->current_video_data_size = seq_buffer->fill_size;
173 seq->current_video_data_ptr = seq_buffer->data;
174 seq_buffer->fill_size = 0;
175 } else {
176 seq->current_video_data_size = 0;
177 seq->current_video_data_ptr = 0;
178 }
179
180 return 0;
181 }
182
183 static int seq_read_header(AVFormatContext *s, AVFormatParameters *ap)
184 {
185 int i, rc;
186 SeqDemuxContext *seq = s->priv_data;
187 ByteIOContext *pb = s->pb;
188 AVStream *st;
189
190 /* init internal buffers */
191 rc = seq_init_frame_buffers(seq, pb);
192 if (rc)
193 return rc;
194
195 seq->current_frame_offs = 0;
196
197 /* preload (no audio data, just buffer operations related data) */
198 for (i = 1; i <= 100; i++) {
199 rc = seq_parse_frame_data(seq, pb);
200 if (rc)
201 return rc;
202 }
203
204 seq->current_frame_pts = 0;
205
206 seq->audio_buffer_full = 0;
207
208 /* initialize the video decoder stream */
209 st = av_new_stream(s, 0);
210 if (!st)
211 return AVERROR(ENOMEM);
212
213 av_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
214 seq->video_stream_index = st->index;
215 st->codec->codec_type = CODEC_TYPE_VIDEO;
216 st->codec->codec_id = CODEC_ID_TIERTEXSEQVIDEO;
217 st->codec->codec_tag = 0; /* no fourcc */
218 st->codec->width = SEQ_FRAME_W;
219 st->codec->height = SEQ_FRAME_H;
220
221 /* initialize the audio decoder stream */
222 st = av_new_stream(s, 0);
223 if (!st)
224 return AVERROR(ENOMEM);
225
226 av_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
227 seq->audio_stream_index = st->index;
228 st->codec->codec_type = CODEC_TYPE_AUDIO;
229 st->codec->codec_id = CODEC_ID_PCM_S16BE;
230 st->codec->codec_tag = 0; /* no tag */
231 st->codec->channels = 1;
232 st->codec->sample_rate = SEQ_SAMPLE_RATE;
233 st->codec->bits_per_sample = 16;
234 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample * st->codec->channels;
235 st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
236
237 return 0;
238 }
239
240 static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
241 {
242 int rc;
243 SeqDemuxContext *seq = s->priv_data;
244 ByteIOContext *pb = s->pb;
245
246 if (!seq->audio_buffer_full) {
247 rc = seq_parse_frame_data(seq, pb);
248 if (rc)
249 return rc;
250
251 /* video packet */
252 if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
253 if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size))
254 return AVERROR(ENOMEM);
255
256 pkt->data[0] = 0;
257 if (seq->current_pal_data_size != 0) {
258 pkt->data[0] |= 1;
259 url_fseek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
260 if (get_buffer(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
261 return AVERROR(EIO);
262 }
263 if (seq->current_video_data_size != 0) {
264 pkt->data[0] |= 2;
265 memcpy(&pkt->data[1 + seq->current_pal_data_size],
266 seq->current_video_data_ptr,
267 seq->current_video_data_size);
268 }
269 pkt->stream_index = seq->video_stream_index;
270 pkt->pts = seq->current_frame_pts;
271
272 /* sound buffer will be processed on next read_packet() call */
273 seq->audio_buffer_full = 1;
274 return 0;
275 }
276 }
277
278 /* audio packet */
279 if (seq->current_audio_data_offs == 0) /* end of data reached */
280 return AVERROR(EIO);
281
282 url_fseek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
283 rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
284 if (rc < 0)
285 return rc;
286
287 pkt->stream_index = seq->audio_stream_index;
288 pkt->pts = seq->current_frame_pts++;
289
290 seq->audio_buffer_full = 0;
291 return 0;
292 }
293
294 static int seq_read_close(AVFormatContext *s)
295 {
296 int i;
297 SeqDemuxContext *seq = s->priv_data;
298
299 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
300 av_free(seq->frame_buffers[i].data);
301
302 return 0;
303 }
304
305 AVInputFormat tiertexseq_demuxer = {
306 "tiertexseq",
307 "Tiertex Limited SEQ format",
308 sizeof(SeqDemuxContext),
309 seq_probe,
310 seq_read_header,
311 seq_read_packet,
312 seq_read_close,
313 };