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 < 256)
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 /* only one fourth of the score since the previous check is too naive */
75 return AVPROBE_SCORE_MAX / 4;
78 static int seq_init_frame_buffers(SeqDemuxContext *seq, ByteIOContext *pb)
81 TiertexSeqFrameBuffer *seq_buffer;
83 url_fseek(pb, 256, SEEK_SET);
85 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
90 seq_buffer = &seq->frame_buffers[i];
91 seq_buffer->fill_size = 0;
92 seq_buffer->data_size = sz;
93 seq_buffer->data = av_malloc(sz);
94 if (!seq_buffer->data)
98 seq->frame_buffers_count = i;
102 static int seq_fill_buffer(SeqDemuxContext *seq, ByteIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
104 TiertexSeqFrameBuffer *seq_buffer;
106 if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
107 return AVERROR_INVALIDDATA;
109 seq_buffer = &seq->frame_buffers[buffer_num];
110 if (seq_buffer->fill_size + data_size > seq_buffer->data_size)
111 return AVERROR_INVALIDDATA;
113 url_fseek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
114 if (get_buffer(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
117 seq_buffer->fill_size += data_size;
121 static int seq_parse_frame_data(SeqDemuxContext *seq, ByteIOContext *pb)
123 unsigned int offset_table[4], buffer_num[4];
124 TiertexSeqFrameBuffer *seq_buffer;
127 seq->current_frame_offs += SEQ_FRAME_SIZE;
128 url_fseek(pb, seq->current_frame_offs, SEEK_SET);
131 seq->current_audio_data_offs = get_le16(pb);
132 if (seq->current_audio_data_offs != 0) {
133 seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
135 seq->current_audio_data_size = 0;
139 seq->current_pal_data_offs = get_le16(pb);
140 if (seq->current_pal_data_offs != 0) {
141 seq->current_pal_data_size = 768;
143 seq->current_pal_data_size = 0;
147 for (i = 0; i < 4; i++)
148 buffer_num[i] = get_byte(pb);
150 for (i = 0; i < 4; i++)
151 offset_table[i] = get_le16(pb);
153 for (i = 0; i < 3; i++) {
154 if (offset_table[i] != 0) {
155 for (e = i + 1; e < 4 && offset_table[e] == 0; e++);
156 seq_fill_buffer(seq, pb, buffer_num[1 + i],
158 offset_table[e] - offset_table[i]);
162 if (buffer_num[0] != 255) {
163 seq_buffer = &seq->frame_buffers[buffer_num[0]];
164 seq->current_video_data_size = seq_buffer->fill_size;
165 seq->current_video_data_ptr = seq_buffer->data;
166 seq_buffer->fill_size = 0;
168 seq->current_video_data_size = 0;
169 seq->current_video_data_ptr = 0;
175 static int seq_read_header(AVFormatContext *s, AVFormatParameters *ap)
178 SeqDemuxContext *seq = (SeqDemuxContext *)s->priv_data;
179 ByteIOContext *pb = &s->pb;
182 /* init internal buffers */
183 rc = seq_init_frame_buffers(seq, pb);
187 seq->current_frame_offs = 0;
189 /* preload (no audio data, just buffer operations related data) */
190 for (i = 1; i <= 100; i++) {
191 rc = seq_parse_frame_data(seq, pb);
196 seq->current_frame_pts = 0;
198 seq->audio_buffer_full = 0;
200 /* initialize the video decoder stream */
201 st = av_new_stream(s, 0);
203 return AVERROR_NOMEM;
205 av_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
206 seq->video_stream_index = st->index;
207 st->codec->codec_type = CODEC_TYPE_VIDEO;
208 st->codec->codec_id = CODEC_ID_TIERTEXSEQVIDEO;
209 st->codec->codec_tag = 0; /* no fourcc */
210 st->codec->width = SEQ_FRAME_W;
211 st->codec->height = SEQ_FRAME_H;
213 /* initialize the audio decoder stream */
214 st = av_new_stream(s, 0);
216 return AVERROR_NOMEM;
218 av_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
219 seq->audio_stream_index = st->index;
220 st->codec->codec_type = CODEC_TYPE_AUDIO;
221 st->codec->codec_id = CODEC_ID_PCM_S16BE;
222 st->codec->codec_tag = 0; /* no tag */
223 st->codec->channels = 1;
224 st->codec->sample_rate = SEQ_SAMPLE_RATE;
225 st->codec->bits_per_sample = 16;
226 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample * st->codec->channels;
227 st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
232 static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
235 SeqDemuxContext *seq = (SeqDemuxContext *)s->priv_data;
236 ByteIOContext *pb = &s->pb;
238 if (!seq->audio_buffer_full) {
239 rc = seq_parse_frame_data(seq, pb);
244 if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
245 if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size))
246 return AVERROR_NOMEM;
249 if (seq->current_pal_data_size != 0) {
251 url_fseek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
252 if (get_buffer(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
255 if (seq->current_video_data_size != 0) {
257 memcpy(&pkt->data[1 + seq->current_pal_data_size],
258 seq->current_video_data_ptr,
259 seq->current_video_data_size);
261 pkt->stream_index = seq->video_stream_index;
262 pkt->pts = seq->current_frame_pts;
264 /* sound buffer will be processed on next read_packet() call */
265 seq->audio_buffer_full = 1;
271 if (seq->current_audio_data_offs == 0) /* end of data reached */
274 url_fseek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
275 rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
279 pkt->stream_index = seq->audio_stream_index;
280 pkt->pts = seq->current_frame_pts++;
282 seq->audio_buffer_full = 0;
286 static int seq_read_close(AVFormatContext *s)
289 SeqDemuxContext *seq = (SeqDemuxContext *)s->priv_data;
291 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
292 av_free(seq->frame_buffers[i].data);
297 AVInputFormat tiertexseq_demuxer = {
299 "Tiertex Limited SEQ format",
300 sizeof(SeqDemuxContext),