2 * Tiertex Limited SEQ File Demuxer
3 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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
27 #include "libavutil/channel_layout.h"
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
40 typedef struct TiertexSeqFrameBuffer {
44 } TiertexSeqFrameBuffer;
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;
63 static int seq_probe(AVProbeData *p)
67 if (p->buf_size < 258)
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++)
76 if(p->buf[256]==0 && p->buf[257]==0)
79 /* only one fourth of the score since the previous check is too naive */
80 return AVPROBE_SCORE_MAX / 4;
83 static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
86 TiertexSeqFrameBuffer *seq_buffer;
88 avio_seek(pb, 256, SEEK_SET);
90 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
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);
103 seq->frame_buffers_count = i;
107 static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
109 TiertexSeqFrameBuffer *seq_buffer;
111 if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
112 return AVERROR_INVALIDDATA;
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;
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)
122 seq_buffer->fill_size += data_size;
126 static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
128 unsigned int offset_table[4], buffer_num[4];
129 TiertexSeqFrameBuffer *seq_buffer;
132 seq->current_frame_offs += SEQ_FRAME_SIZE;
133 avio_seek(pb, seq->current_frame_offs, SEEK_SET);
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;
140 seq->current_audio_data_size = 0;
144 seq->current_pal_data_offs = avio_rl16(pb);
145 if (seq->current_pal_data_offs) {
146 seq->current_pal_data_size = 768;
148 seq->current_pal_data_size = 0;
152 for (i = 0; i < 4; i++)
153 buffer_num[i] = avio_r8(pb);
155 for (i = 0; i < 4; i++)
156 offset_table[i] = avio_rl16(pb);
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],
163 offset_table[e] - offset_table[i]);
169 if (buffer_num[0] != 255) {
170 if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
171 return AVERROR_INVALIDDATA;
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;
178 seq->current_video_data_size = 0;
179 seq->current_video_data_ptr = 0;
185 static int seq_read_header(AVFormatContext *s)
188 SeqDemuxContext *seq = s->priv_data;
189 AVIOContext *pb = s->pb;
192 /* init internal buffers */
193 rc = seq_init_frame_buffers(seq, pb);
197 seq->current_frame_offs = 0;
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);
206 seq->current_frame_pts = 0;
208 seq->audio_buffer_full = 0;
210 /* initialize the video decoder stream */
211 st = avformat_new_stream(s, NULL);
213 return AVERROR(ENOMEM);
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;
223 /* initialize the audio decoder stream */
224 st = avformat_new_stream(s, NULL);
226 return AVERROR(ENOMEM);
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;
244 static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
247 SeqDemuxContext *seq = s->priv_data;
248 AVIOContext *pb = s->pb;
250 if (!seq->audio_buffer_full) {
251 rc = seq_parse_frame_data(seq, pb);
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);
261 if (seq->current_pal_data_size) {
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)
267 if (seq->current_video_data_size) {
269 memcpy(&pkt->data[1 + seq->current_pal_data_size],
270 seq->current_video_data_ptr,
271 seq->current_video_data_size);
273 pkt->stream_index = seq->video_stream_index;
274 pkt->pts = seq->current_frame_pts;
276 /* sound buffer will be processed on next read_packet() call */
277 seq->audio_buffer_full = 1;
283 if (seq->current_audio_data_offs == 0) /* end of data reached */
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);
291 pkt->stream_index = seq->audio_stream_index;
292 seq->current_frame_pts++;
294 seq->audio_buffer_full = 0;
298 static int seq_read_close(AVFormatContext *s)
301 SeqDemuxContext *seq = s->priv_data;
303 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
304 av_free(seq->frame_buffers[i].data);
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,