2 * Tiertex Limited SEQ File Demuxer
3 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
5 * This file is part of FFmpeg.
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.
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.
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
24 * Tiertex Limited SEQ file demuxer
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
38 typedef struct TiertexSeqFrameBuffer {
42 } TiertexSeqFrameBuffer;
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;
61 static int seq_probe(AVProbeData *p)
65 if (p->buf_size < 258)
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++)
74 if(p->buf[256]==0 && p->buf[257]==0)
77 /* only one fourth of the score since the previous check is too naive */
78 return AVPROBE_SCORE_MAX / 4;
81 static int seq_init_frame_buffers(SeqDemuxContext *seq, ByteIOContext *pb)
84 TiertexSeqFrameBuffer *seq_buffer;
86 url_fseek(pb, 256, SEEK_SET);
88 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
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);
101 seq->frame_buffers_count = i;
105 static int seq_fill_buffer(SeqDemuxContext *seq, ByteIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
107 TiertexSeqFrameBuffer *seq_buffer;
109 if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
110 return AVERROR_INVALIDDATA;
112 seq_buffer = &seq->frame_buffers[buffer_num];
113 if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0)
114 return AVERROR_INVALIDDATA;
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)
120 seq_buffer->fill_size += data_size;
124 static int seq_parse_frame_data(SeqDemuxContext *seq, ByteIOContext *pb)
126 unsigned int offset_table[4], buffer_num[4];
127 TiertexSeqFrameBuffer *seq_buffer;
130 seq->current_frame_offs += SEQ_FRAME_SIZE;
131 url_fseek(pb, seq->current_frame_offs, SEEK_SET);
134 seq->current_audio_data_offs = get_le16(pb);
135 if (seq->current_audio_data_offs) {
136 seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
138 seq->current_audio_data_size = 0;
142 seq->current_pal_data_offs = get_le16(pb);
143 if (seq->current_pal_data_offs) {
144 seq->current_pal_data_size = 768;
146 seq->current_pal_data_size = 0;
150 for (i = 0; i < 4; i++)
151 buffer_num[i] = get_byte(pb);
153 for (i = 0; i < 4; i++)
154 offset_table[i] = get_le16(pb);
156 for (i = 0; i < 3; i++) {
157 if (offset_table[i]) {
158 for (e = i + 1; e < 3 && offset_table[e] == 0; e++);
159 err = seq_fill_buffer(seq, pb, buffer_num[1 + i],
161 offset_table[e] - offset_table[i]);
167 if (buffer_num[0] != 255) {
168 if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
169 return AVERROR_INVALIDDATA;
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;
176 seq->current_video_data_size = 0;
177 seq->current_video_data_ptr = 0;
183 static int seq_read_header(AVFormatContext *s, AVFormatParameters *ap)
186 SeqDemuxContext *seq = s->priv_data;
187 ByteIOContext *pb = s->pb;
190 /* init internal buffers */
191 rc = seq_init_frame_buffers(seq, pb);
195 seq->current_frame_offs = 0;
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);
204 seq->current_frame_pts = 0;
206 seq->audio_buffer_full = 0;
208 /* initialize the video decoder stream */
209 st = av_new_stream(s, 0);
211 return AVERROR(ENOMEM);
213 av_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
214 seq->video_stream_index = st->index;
215 st->codec->codec_type = AVMEDIA_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;
221 /* initialize the audio decoder stream */
222 st = av_new_stream(s, 0);
224 return AVERROR(ENOMEM);
226 av_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
227 seq->audio_stream_index = st->index;
228 st->codec->codec_type = AVMEDIA_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_coded_sample = 16;
234 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
235 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
240 static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
243 SeqDemuxContext *seq = s->priv_data;
244 ByteIOContext *pb = s->pb;
246 if (!seq->audio_buffer_full) {
247 rc = seq_parse_frame_data(seq, pb);
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);
257 if (seq->current_pal_data_size) {
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)
263 if (seq->current_video_data_size) {
265 memcpy(&pkt->data[1 + seq->current_pal_data_size],
266 seq->current_video_data_ptr,
267 seq->current_video_data_size);
269 pkt->stream_index = seq->video_stream_index;
270 pkt->pts = seq->current_frame_pts;
272 /* sound buffer will be processed on next read_packet() call */
273 seq->audio_buffer_full = 1;
279 if (seq->current_audio_data_offs == 0) /* end of data reached */
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);
287 pkt->stream_index = seq->audio_stream_index;
288 seq->current_frame_pts++;
290 seq->audio_buffer_full = 0;
294 static int seq_read_close(AVFormatContext *s)
297 SeqDemuxContext *seq = s->priv_data;
299 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
300 av_free(seq->frame_buffers[i].data);
305 AVInputFormat ff_tiertexseq_demuxer = {
307 NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ format"),
308 sizeof(SeqDemuxContext),