| 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 | |
| 40 | typedef struct TiertexSeqFrameBuffer { |
| 41 | int fill_size; |
| 42 | int data_size; |
| 43 | unsigned char *data; |
| 44 | } TiertexSeqFrameBuffer; |
| 45 | |
| 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; |
| 60 | } SeqDemuxContext; |
| 61 | |
| 62 | |
| 63 | static 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 | |
| 83 | static 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 | |
| 107 | static 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 | |
| 126 | static 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 | |
| 185 | static 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 | |
| 244 | static 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 | |
| 298 | static 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_freep(&seq->frame_buffers[i].data); |
| 305 | |
| 306 | return 0; |
| 307 | } |
| 308 | |
| 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, |
| 317 | }; |