328 lines
9.6 KiB
C
328 lines
9.6 KiB
C
/*
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* Tiertex Limited SEQ File Demuxer
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* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Tiertex Limited SEQ file demuxer
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*/
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#include "libavutil/channel_layout.h"
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#include "avformat.h"
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#include "internal.h"
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#define SEQ_FRAME_SIZE 6144
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#define SEQ_FRAME_W 256
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#define SEQ_FRAME_H 128
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#define SEQ_NUM_FRAME_BUFFERS 30
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#define SEQ_AUDIO_BUFFER_SIZE 882
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#define SEQ_SAMPLE_RATE 22050
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#define SEQ_FRAME_RATE 25
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typedef struct TiertexSeqFrameBuffer {
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int fill_size;
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int data_size;
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unsigned char *data;
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} TiertexSeqFrameBuffer;
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typedef struct SeqDemuxContext {
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int audio_stream_index;
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int video_stream_index;
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int current_frame_pts;
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int current_frame_offs;
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TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS];
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int frame_buffers_count;
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unsigned int current_audio_data_size;
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unsigned int current_audio_data_offs;
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unsigned int current_pal_data_size;
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unsigned int current_pal_data_offs;
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unsigned int current_video_data_size;
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unsigned char *current_video_data_ptr;
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int audio_buffer_full;
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} SeqDemuxContext;
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static int seq_probe(const AVProbeData *p)
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{
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int i;
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if (p->buf_size < 258)
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return 0;
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/* there's no real header in a .seq file, the only thing they have in common */
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/* is the first 256 bytes of the file which are always filled with 0 */
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for (i = 0; i < 256; i++)
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if (p->buf[i])
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return 0;
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if(p->buf[256]==0 && p->buf[257]==0)
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return 0;
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/* only one fourth of the score since the previous check is too naive */
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return AVPROBE_SCORE_MAX / 4;
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}
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static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
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{
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int i, sz;
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TiertexSeqFrameBuffer *seq_buffer;
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avio_seek(pb, 256, SEEK_SET);
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for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
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sz = avio_rl16(pb);
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if (sz == 0)
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break;
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else {
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seq_buffer = &seq->frame_buffers[i];
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seq_buffer->fill_size = 0;
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seq_buffer->data_size = sz;
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seq_buffer->data = av_malloc(sz);
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if (!seq_buffer->data)
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return AVERROR(ENOMEM);
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}
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}
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seq->frame_buffers_count = i;
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return 0;
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}
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static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
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{
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TiertexSeqFrameBuffer *seq_buffer;
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if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
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return AVERROR_INVALIDDATA;
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seq_buffer = &seq->frame_buffers[buffer_num];
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if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0)
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return AVERROR_INVALIDDATA;
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avio_seek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
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if (avio_read(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
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return AVERROR(EIO);
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seq_buffer->fill_size += data_size;
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return 0;
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}
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static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
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{
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unsigned int offset_table[4], buffer_num[4];
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TiertexSeqFrameBuffer *seq_buffer;
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int i, e, err;
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seq->current_frame_offs += SEQ_FRAME_SIZE;
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avio_seek(pb, seq->current_frame_offs, SEEK_SET);
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/* sound data */
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seq->current_audio_data_offs = avio_rl16(pb);
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if (seq->current_audio_data_offs) {
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seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
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} else {
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seq->current_audio_data_size = 0;
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}
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/* palette data */
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seq->current_pal_data_offs = avio_rl16(pb);
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if (seq->current_pal_data_offs) {
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seq->current_pal_data_size = 768;
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} else {
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seq->current_pal_data_size = 0;
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}
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/* video data */
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for (i = 0; i < 4; i++)
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buffer_num[i] = avio_r8(pb);
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for (i = 0; i < 4; i++)
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offset_table[i] = avio_rl16(pb);
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for (i = 0; i < 3; i++) {
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if (offset_table[i]) {
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for (e = i + 1; e < 3 && offset_table[e] == 0; e++);
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err = seq_fill_buffer(seq, pb, buffer_num[1 + i],
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offset_table[i],
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offset_table[e] - offset_table[i]);
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if (err)
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return err;
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}
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}
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if (buffer_num[0] != 255) {
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if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
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return AVERROR_INVALIDDATA;
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seq_buffer = &seq->frame_buffers[buffer_num[0]];
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seq->current_video_data_size = seq_buffer->fill_size;
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seq->current_video_data_ptr = seq_buffer->data;
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seq_buffer->fill_size = 0;
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} else {
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seq->current_video_data_size = 0;
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seq->current_video_data_ptr = 0;
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}
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return 0;
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}
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static int seq_read_close(AVFormatContext *s)
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{
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int i;
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SeqDemuxContext *seq = s->priv_data;
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for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
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av_freep(&seq->frame_buffers[i].data);
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return 0;
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}
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static int seq_read_header(AVFormatContext *s)
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{
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int i, rc;
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SeqDemuxContext *seq = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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/* init internal buffers */
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rc = seq_init_frame_buffers(seq, pb);
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if (rc) {
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seq_read_close(s);
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return rc;
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}
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seq->current_frame_offs = 0;
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/* preload (no audio data, just buffer operations related data) */
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for (i = 1; i <= 100; i++) {
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rc = seq_parse_frame_data(seq, pb);
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if (rc) {
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seq_read_close(s);
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return rc;
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}
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}
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seq->current_frame_pts = 0;
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seq->audio_buffer_full = 0;
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/* initialize the video decoder stream */
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st = avformat_new_stream(s, NULL);
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if (!st) {
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seq_read_close(s);
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return AVERROR(ENOMEM);
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}
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avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
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seq->video_stream_index = st->index;
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO;
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st->codecpar->codec_tag = 0; /* no fourcc */
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st->codecpar->width = SEQ_FRAME_W;
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st->codecpar->height = SEQ_FRAME_H;
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/* initialize the audio decoder stream */
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st = avformat_new_stream(s, NULL);
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if (!st) {
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seq_read_close(s);
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return AVERROR(ENOMEM);
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}
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st->start_time = 0;
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avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
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seq->audio_stream_index = st->index;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
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st->codecpar->codec_tag = 0; /* no tag */
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st->codecpar->channels = 1;
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st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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st->codecpar->sample_rate = SEQ_SAMPLE_RATE;
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st->codecpar->bits_per_coded_sample = 16;
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st->codecpar->bit_rate = st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample * st->codecpar->channels;
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st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample / 8;
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return 0;
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}
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static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int rc;
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SeqDemuxContext *seq = s->priv_data;
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AVIOContext *pb = s->pb;
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if (!seq->audio_buffer_full) {
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rc = seq_parse_frame_data(seq, pb);
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if (rc)
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return rc;
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/* video packet */
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if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
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rc = av_new_packet(pkt, 1 + seq->current_pal_data_size
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+ seq->current_video_data_size);
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if (rc < 0)
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return rc;
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pkt->data[0] = 0;
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if (seq->current_pal_data_size) {
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pkt->data[0] |= 1;
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avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
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if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
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return AVERROR(EIO);
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}
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if (seq->current_video_data_size) {
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pkt->data[0] |= 2;
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memcpy(&pkt->data[1 + seq->current_pal_data_size],
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seq->current_video_data_ptr,
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seq->current_video_data_size);
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}
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pkt->stream_index = seq->video_stream_index;
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pkt->pts = seq->current_frame_pts;
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/* sound buffer will be processed on next read_packet() call */
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seq->audio_buffer_full = 1;
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return 0;
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}
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}
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/* audio packet */
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if (seq->current_audio_data_offs == 0) /* end of data reached */
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return AVERROR(EIO);
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avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
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rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
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if (rc < 0)
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return rc;
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pkt->stream_index = seq->audio_stream_index;
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seq->current_frame_pts++;
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seq->audio_buffer_full = 0;
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return 0;
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}
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AVInputFormat ff_tiertexseq_demuxer = {
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.name = "tiertexseq",
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.long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"),
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.priv_data_size = sizeof(SeqDemuxContext),
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.read_probe = seq_probe,
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.read_header = seq_read_header,
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.read_packet = seq_read_packet,
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.read_close = seq_read_close,
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};
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