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 "avformat.h" 29#include "internal.h" 30 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 38 39 40typedef struct TiertexSeqFrameBuffer { 41 int fill_size; 42 int data_size; 43 unsigned char *data; 44} TiertexSeqFrameBuffer; 45 46typedef 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; 60} SeqDemuxContext; 61 62 63static int seq_probe(AVProbeData *p) 64{ 65 int i; 66 67 if (p->buf_size < 258) 68 return 0; 69 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++) 73 if (p->buf[i]) 74 return 0; 75 76 if(p->buf[256]==0 && p->buf[257]==0) 77 return 0; 78 79 /* only one fourth of the score since the previous check is too naive */ 80 return AVPROBE_SCORE_MAX / 4; 81} 82 83static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb) 84{ 85 int i, sz; 86 TiertexSeqFrameBuffer *seq_buffer; 87 88 avio_seek(pb, 256, SEEK_SET); 89 90 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) { 91 sz = avio_rl16(pb); 92 if (sz == 0) 93 break; 94 else { 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); 101 } 102 } 103 seq->frame_buffers_count = i; 104 return 0; 105} 106 107static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size) 108{ 109 TiertexSeqFrameBuffer *seq_buffer; 110 111 if (buffer_num >= SEQ_NUM_FRAME_BUFFERS) 112 return AVERROR_INVALIDDATA; 113 114 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; 117 118 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) 120 return AVERROR(EIO); 121 122 seq_buffer->fill_size += data_size; 123 return 0; 124} 125 126static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb) 127{ 128 unsigned int offset_table[4], buffer_num[4]; 129 TiertexSeqFrameBuffer *seq_buffer; 130 int i, e, err; 131 132 seq->current_frame_offs += SEQ_FRAME_SIZE; 133 avio_seek(pb, seq->current_frame_offs, SEEK_SET); 134 135 /* sound data */ 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; 139 } else { 140 seq->current_audio_data_size = 0; 141 } 142 143 /* palette data */ 144 seq->current_pal_data_offs = avio_rl16(pb); 145 if (seq->current_pal_data_offs) { 146 seq->current_pal_data_size = 768; 147 } else { 148 seq->current_pal_data_size = 0; 149 } 150 151 /* video data */ 152 for (i = 0; i < 4; i++) 153 buffer_num[i] = avio_r8(pb); 154 155 for (i = 0; i < 4; i++) 156 offset_table[i] = avio_rl16(pb); 157 158 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], 162 offset_table[i], 163 offset_table[e] - offset_table[i]); 164 if (err) 165 return err; 166 } 167 } 168 169 if (buffer_num[0] != 255) { 170 if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS) 171 return AVERROR_INVALIDDATA; 172 173 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; 177 } else { 178 seq->current_video_data_size = 0; 179 seq->current_video_data_ptr = 0; 180 } 181 182 return 0; 183} 184 185static int seq_read_header(AVFormatContext *s) 186{ 187 int i, rc; 188 SeqDemuxContext *seq = s->priv_data; 189 AVIOContext *pb = s->pb; 190 AVStream *st; 191 192 /* init internal buffers */ 193 rc = seq_init_frame_buffers(seq, pb); 194 if (rc) 195 return rc; 196 197 seq->current_frame_offs = 0; 198 199 /* preload (no audio data, just buffer operations related data) */ 200 for (i = 1; i <= 100; i++) { 201 rc = seq_parse_frame_data(seq, pb); 202 if (rc) 203 return rc; 204 } 205 206 seq->current_frame_pts = 0; 207 208 seq->audio_buffer_full = 0; 209 210 /* initialize the video decoder stream */ 211 st = avformat_new_stream(s, NULL); 212 if (!st) 213 return AVERROR(ENOMEM); 214 215 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; 222 223 /* initialize the audio decoder stream */ 224 st = avformat_new_stream(s, NULL); 225 if (!st) 226 return AVERROR(ENOMEM); 227 228 st->start_time = 0; 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; 240 241 return 0; 242} 243 244static int seq_read_packet(AVFormatContext *s, AVPacket *pkt) 245{ 246 int rc; 247 SeqDemuxContext *seq = s->priv_data; 248 AVIOContext *pb = s->pb; 249 250 if (!seq->audio_buffer_full) { 251 rc = seq_parse_frame_data(seq, pb); 252 if (rc) 253 return rc; 254 255 /* video packet */ 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); 259 260 pkt->data[0] = 0; 261 if (seq->current_pal_data_size) { 262 pkt->data[0] |= 1; 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) 265 return AVERROR(EIO); 266 } 267 if (seq->current_video_data_size) { 268 pkt->data[0] |= 2; 269 memcpy(&pkt->data[1 + seq->current_pal_data_size], 270 seq->current_video_data_ptr, 271 seq->current_video_data_size); 272 } 273 pkt->stream_index = seq->video_stream_index; 274 pkt->pts = seq->current_frame_pts; 275 276 /* sound buffer will be processed on next read_packet() call */ 277 seq->audio_buffer_full = 1; 278 return 0; 279 } 280 } 281 282 /* audio packet */ 283 if (seq->current_audio_data_offs == 0) /* end of data reached */ 284 return AVERROR(EIO); 285 286 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); 288 if (rc < 0) 289 return rc; 290 291 pkt->stream_index = seq->audio_stream_index; 292 seq->current_frame_pts++; 293 294 seq->audio_buffer_full = 0; 295 return 0; 296} 297 298static int seq_read_close(AVFormatContext *s) 299{ 300 int i; 301 SeqDemuxContext *seq = s->priv_data; 302 303 for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) 304 av_free(seq->frame_buffers[i].data); 305 306 return 0; 307} 308 309AVInputFormat 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, 317}; 318