FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/tiertexseq.c
Date: 2024-04-25 15:36:26
Exec Total Coverage
Lines: 132 146 90.4%
Functions: 7 7 100.0%
Branches: 57 76 75.0%
Line Branch Exec Source
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 "libavutil/mem.h"
29 #include "avformat.h"
30 #include "demux.h"
31 #include "internal.h"
32
33 #define SEQ_FRAME_SIZE 6144
34 #define SEQ_FRAME_W 256
35 #define SEQ_FRAME_H 128
36 #define SEQ_NUM_FRAME_BUFFERS 30
37 #define SEQ_AUDIO_BUFFER_SIZE 882
38 #define SEQ_SAMPLE_RATE 22050
39 #define SEQ_FRAME_RATE 25
40
41
42 typedef struct TiertexSeqFrameBuffer {
43 int fill_size;
44 int data_size;
45 unsigned char *data;
46 } TiertexSeqFrameBuffer;
47
48 typedef struct SeqDemuxContext {
49 int audio_stream_index;
50 int video_stream_index;
51 int current_frame_pts;
52 int current_frame_offs;
53 TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS];
54 int frame_buffers_count;
55 unsigned int current_audio_data_size;
56 unsigned int current_audio_data_offs;
57 unsigned int current_pal_data_size;
58 unsigned int current_pal_data_offs;
59 unsigned int current_video_data_size;
60 unsigned char *current_video_data_ptr;
61 int audio_buffer_full;
62 } SeqDemuxContext;
63
64
65 7128 static int seq_probe(const AVProbeData *p)
66 {
67 int i;
68
69
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 7128 if (p->buf_size < 258)
70 22 return 0;
71
72 /* there's no real header in a .seq file, the only thing they have in common */
73 /* is the first 256 bytes of the file which are always filled with 0 */
74
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 17031 for (i = 0; i < 256; i++)
75
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 17007 if (p->buf[i])
76 7082 return 0;
77
78
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 24 if(p->buf[256]==0 && p->buf[257]==0)
79 14 return 0;
80
81 /* only one fourth of the score since the previous check is too naive */
82 10 return AVPROBE_SCORE_MAX / 4;
83 }
84
85 1 static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
86 {
87 int i, sz;
88 TiertexSeqFrameBuffer *seq_buffer;
89
90 1 avio_seek(pb, 256, SEEK_SET);
91
92
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 3 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
93 3 sz = avio_rl16(pb);
94
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 3 if (sz == 0)
95 1 break;
96 else {
97 2 seq_buffer = &seq->frame_buffers[i];
98 2 seq_buffer->fill_size = 0;
99 2 seq_buffer->data_size = sz;
100 2 seq_buffer->data = av_malloc(sz);
101
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 2 if (!seq_buffer->data)
102 ✗ return AVERROR(ENOMEM);
103 }
104 }
105 1 seq->frame_buffers_count = i;
106 1 return 0;
107 }
108
109 58 static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
110 {
111 TiertexSeqFrameBuffer *seq_buffer;
112
113
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 58 if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
114 ✗ return AVERROR_INVALIDDATA;
115
116 58 seq_buffer = &seq->frame_buffers[buffer_num];
117
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 58 if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0)
118 ✗ return AVERROR_INVALIDDATA;
119
120 58 avio_seek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
121
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 58 if (avio_read(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
122 ✗ return AVERROR(EIO);
123
124 58 seq_buffer->fill_size += data_size;
125 58 return 0;
126 }
127
128 178 static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
129 {
130 unsigned int offset_table[4], buffer_num[4];
131 TiertexSeqFrameBuffer *seq_buffer;
132 int i, e, err;
133
134 178 seq->current_frame_offs += SEQ_FRAME_SIZE;
135 178 avio_seek(pb, seq->current_frame_offs, SEEK_SET);
136
137 /* sound data */
138 178 seq->current_audio_data_offs = avio_rl16(pb);
139
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 178 if (seq->current_audio_data_offs) {
140 77 seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
141 } else {
142 101 seq->current_audio_data_size = 0;
143 }
144
145 /* palette data */
146 178 seq->current_pal_data_offs = avio_rl16(pb);
147
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 178 if (seq->current_pal_data_offs) {
148 21 seq->current_pal_data_size = 768;
149 } else {
150 157 seq->current_pal_data_size = 0;
151 }
152
153 /* video data */
154
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 890 for (i = 0; i < 4; i++)
155 712 buffer_num[i] = avio_r8(pb);
156
157
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 890 for (i = 0; i < 4; i++)
158 712 offset_table[i] = avio_rl16(pb);
159
160
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 712 for (i = 0; i < 3; i++) {
161
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 534 if (offset_table[i]) {
162
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 165 for (e = i + 1; e < 3 && offset_table[e] == 0; e++);
163 58 err = seq_fill_buffer(seq, pb, buffer_num[1 + i],
164 offset_table[i],
165 58 offset_table[e] - offset_table[i]);
166
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 58 if (err)
167 ✗ return err;
168 }
169 }
170
171
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 178 if (buffer_num[0] != 255) {
172
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 22 if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
173 ✗ return AVERROR_INVALIDDATA;
174
175 22 seq_buffer = &seq->frame_buffers[buffer_num[0]];
176 22 seq->current_video_data_size = seq_buffer->fill_size;
177 22 seq->current_video_data_ptr = seq_buffer->data;
178 22 seq_buffer->fill_size = 0;
179 } else {
180 156 seq->current_video_data_size = 0;
181 156 seq->current_video_data_ptr = 0;
182 }
183
184 178 return 0;
185 }
186
187 1 static int seq_read_close(AVFormatContext *s)
188 {
189 int i;
190 1 SeqDemuxContext *seq = s->priv_data;
191
192
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 31 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
193 30 av_freep(&seq->frame_buffers[i].data);
194
195 1 return 0;
196 }
197
198 1 static int seq_read_header(AVFormatContext *s)
199 {
200 int i, rc;
201 1 SeqDemuxContext *seq = s->priv_data;
202 1 AVIOContext *pb = s->pb;
203 AVStream *st;
204
205 /* init internal buffers */
206 1 rc = seq_init_frame_buffers(seq, pb);
207
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 1 if (rc < 0)
208 ✗ return rc;
209
210 1 seq->current_frame_offs = 0;
211
212 /* preload (no audio data, just buffer operations related data) */
213
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 101 for (i = 1; i <= 100; i++) {
214 100 rc = seq_parse_frame_data(seq, pb);
215
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 100 if (rc < 0)
216 ✗ return rc;
217 }
218
219 1 seq->current_frame_pts = 0;
220
221 1 seq->audio_buffer_full = 0;
222
223 /* initialize the video decoder stream */
224 1 st = avformat_new_stream(s, NULL);
225
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 1 if (!st)
226 ✗ return AVERROR(ENOMEM);
227
228 1 avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
229 1 seq->video_stream_index = st->index;
230 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
231 1 st->codecpar->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO;
232 1 st->codecpar->codec_tag = 0; /* no fourcc */
233 1 st->codecpar->width = SEQ_FRAME_W;
234 1 st->codecpar->height = SEQ_FRAME_H;
235
236 /* initialize the audio decoder stream */
237 1 st = avformat_new_stream(s, NULL);
238
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 1 if (!st)
239 ✗ return AVERROR(ENOMEM);
240
241 1 st->start_time = 0;
242 1 avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
243 1 seq->audio_stream_index = st->index;
244 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
245 1 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
246 1 st->codecpar->codec_tag = 0; /* no tag */
247 1 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
248 1 st->codecpar->sample_rate = SEQ_SAMPLE_RATE;
249 1 st->codecpar->bits_per_coded_sample = 16;
250 1 st->codecpar->bit_rate = st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample * st->codecpar->ch_layout.nb_channels;
251 1 st->codecpar->block_align = st->codecpar->ch_layout.nb_channels * st->codecpar->bits_per_coded_sample / 8;
252
253 1 return 0;
254 }
255
256 99 static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
257 {
258 int rc;
259 99 SeqDemuxContext *seq = s->priv_data;
260 99 AVIOContext *pb = s->pb;
261
262
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 99 if (!seq->audio_buffer_full) {
263 78 rc = seq_parse_frame_data(seq, pb);
264
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 78 if (rc)
265 ✗ return rc;
266
267 /* video packet */
268
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 78 if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
269 21 rc = av_new_packet(pkt, 1 + seq->current_pal_data_size
270 21 + seq->current_video_data_size);
271
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 21 if (rc < 0)
272 ✗ return rc;
273
274 21 pkt->data[0] = 0;
275
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 21 if (seq->current_pal_data_size) {
276 21 pkt->data[0] |= 1;
277 21 avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
278
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 21 if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
279 ✗ return AVERROR(EIO);
280 }
281
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 21 if (seq->current_video_data_size) {
282 21 pkt->data[0] |= 2;
283 21 memcpy(&pkt->data[1 + seq->current_pal_data_size],
284 21 seq->current_video_data_ptr,
285 21 seq->current_video_data_size);
286 }
287 21 pkt->stream_index = seq->video_stream_index;
288 21 pkt->pts = seq->current_frame_pts;
289
290 /* sound buffer will be processed on next read_packet() call */
291 21 seq->audio_buffer_full = 1;
292 21 return 0;
293 }
294 }
295
296 /* audio packet */
297
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 78 if (seq->current_audio_data_offs == 0) /* end of data reached */
298 1 return AVERROR(EIO);
299
300 77 avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
301 77 rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
302
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 77 if (rc < 0)
303 ✗ return rc;
304
305 77 pkt->stream_index = seq->audio_stream_index;
306 77 seq->current_frame_pts++;
307
308 77 seq->audio_buffer_full = 0;
309 77 return 0;
310 }
311
312 const FFInputFormat ff_tiertexseq_demuxer = {
313 .p.name = "tiertexseq",
314 .p.long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"),
315 .priv_data_size = sizeof(SeqDemuxContext),
316 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
317 .read_probe = seq_probe,
318 .read_header = seq_read_header,
319 .read_packet = seq_read_packet,
320 .read_close = seq_read_close,
321 };
322