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authorBaptiste Coudurier <baptiste.coudurier@gmail.com>2006-10-12 12:02:58 +0000
committerBaptiste Coudurier <baptiste.coudurier@gmail.com>2006-10-12 12:02:58 +0000
commit29f86228a0d77bd6f62e66334b732650396f9571 (patch)
treece42c2d42c4bbdd71bbc2016c34c01f4051c7683 /libavformat/tiertexseq.c
parent7da4d4cdeca48667378b96a451621fc9aa76664b (diff)
downloadffmpeg-29f86228a0d77bd6f62e66334b732650396f9571.tar.gz
support for Tiertex .seq files demuxing/video decoding, by Gregory Montoir %cyx A users P sourceforge P net%
Originally committed as revision 6672 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/tiertexseq.c')
-rw-r--r--libavformat/tiertexseq.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/libavformat/tiertexseq.c b/libavformat/tiertexseq.c
new file mode 100644
index 0000000000..d252326208
--- /dev/null
+++ b/libavformat/tiertexseq.c
@@ -0,0 +1,305 @@
+/*
+ * Tiertex Limited SEQ File Demuxer
+ * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file tiertexseq.c
+ * Tiertex Limited SEQ file demuxer
+ */
+
+#include "avformat.h"
+
+#define SEQ_FRAME_SIZE 6144
+#define SEQ_FRAME_W 256
+#define SEQ_FRAME_H 128
+#define SEQ_NUM_FRAME_BUFFERS 30
+#define SEQ_AUDIO_BUFFER_SIZE 882
+#define SEQ_SAMPLE_RATE 22050
+#define SEQ_FRAME_RATE 25
+
+
+typedef struct TiertexSeqFrameBuffer {
+ int fill_size;
+ int data_size;
+ unsigned char *data;
+} TiertexSeqFrameBuffer;
+
+typedef struct SeqDemuxContext {
+ int audio_stream_index;
+ int video_stream_index;
+ int current_frame_pts;
+ int current_frame_offs;
+ TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS];
+ int frame_buffers_count;
+ unsigned int current_audio_data_size;
+ unsigned int current_audio_data_offs;
+ unsigned int current_pal_data_size;
+ unsigned int current_pal_data_offs;
+ unsigned int current_video_data_size;
+ unsigned char *current_video_data_ptr;
+ int audio_buffer_full;
+} SeqDemuxContext;
+
+
+static int seq_probe(AVProbeData *p)
+{
+ int i;
+
+ if (p->buf_size < 256)
+ return 0;
+
+ /* there's no real header in a .seq file, the only thing they have in common */
+ /* is the first 256 bytes of the file which are always filled with 0 */
+ for (i = 0; i < 256; i++)
+ if (p->buf[0] != 0)
+ return 0;
+
+ /* only one fourth of the score since the previous check is too naive */
+ return AVPROBE_SCORE_MAX / 4;
+}
+
+static int seq_init_frame_buffers(SeqDemuxContext *seq, ByteIOContext *pb)
+{
+ int i, sz;
+ TiertexSeqFrameBuffer *seq_buffer;
+
+ url_fseek(pb, 256, SEEK_SET);
+
+ for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
+ sz = get_le16(pb);
+ if (sz == 0)
+ break;
+ else {
+ seq_buffer = &seq->frame_buffers[i];
+ seq_buffer->fill_size = 0;
+ seq_buffer->data_size = sz;
+ seq_buffer->data = av_malloc(sz);
+ if (!seq_buffer->data)
+ return AVERROR_NOMEM;
+ }
+ }
+ seq->frame_buffers_count = i;
+ return 0;
+}
+
+static int seq_fill_buffer(SeqDemuxContext *seq, ByteIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
+{
+ TiertexSeqFrameBuffer *seq_buffer;
+
+ if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
+ return AVERROR_INVALIDDATA;
+
+ seq_buffer = &seq->frame_buffers[buffer_num];
+ if (seq_buffer->fill_size + data_size > seq_buffer->data_size)
+ return AVERROR_INVALIDDATA;
+
+ url_fseek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
+ if (get_buffer(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
+ return AVERROR_IO;
+
+ seq_buffer->fill_size += data_size;
+ return 0;
+}
+
+static int seq_parse_frame_data(SeqDemuxContext *seq, ByteIOContext *pb)
+{
+ unsigned int offset_table[4], buffer_num[4];
+ TiertexSeqFrameBuffer *seq_buffer;
+ int i, e;
+
+ seq->current_frame_offs += SEQ_FRAME_SIZE;
+ url_fseek(pb, seq->current_frame_offs, SEEK_SET);
+
+ /* sound data */
+ seq->current_audio_data_offs = get_le16(pb);
+ if (seq->current_audio_data_offs != 0) {
+ seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
+ } else {
+ seq->current_audio_data_size = 0;
+ }
+
+ /* palette data */
+ seq->current_pal_data_offs = get_le16(pb);
+ if (seq->current_pal_data_offs != 0) {
+ seq->current_pal_data_size = 768;
+ } else {
+ seq->current_pal_data_size = 0;
+ }
+
+ /* video data */
+ for (i = 0; i < 4; i++)
+ buffer_num[i] = get_byte(pb);
+
+ for (i = 0; i < 4; i++)
+ offset_table[i] = get_le16(pb);
+
+ for (i = 0; i < 3; i++) {
+ if (offset_table[i] != 0) {
+ for (e = i + 1; e < 4 && offset_table[e] == 0; e++);
+ seq_fill_buffer(seq, pb, buffer_num[1 + i],
+ offset_table[i],
+ offset_table[e] - offset_table[i]);
+ }
+ }
+
+ if (buffer_num[0] != 255) {
+ seq_buffer = &seq->frame_buffers[buffer_num[0]];
+ seq->current_video_data_size = seq_buffer->fill_size;
+ seq->current_video_data_ptr = seq_buffer->data;
+ seq_buffer->fill_size = 0;
+ } else {
+ seq->current_video_data_size = 0;
+ seq->current_video_data_ptr = 0;
+ }
+
+ return 0;
+}
+
+static int seq_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ int i, rc;
+ SeqDemuxContext *seq = (SeqDemuxContext *)s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ AVStream *st;
+
+ /* init internal buffers */
+ rc = seq_init_frame_buffers(seq, pb);
+ if (rc)
+ return rc;
+
+ seq->current_frame_offs = 0;
+
+ /* preload (no audio data, just buffer operations related data) */
+ for (i = 1; i <= 100; i++) {
+ rc = seq_parse_frame_data(seq, pb);
+ if (rc)
+ return rc;
+ }
+
+ seq->current_frame_pts = 0;
+
+ seq->audio_buffer_full = 0;
+
+ /* initialize the video decoder stream */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+
+ av_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
+ seq->video_stream_index = st->index;
+ st->codec->codec_type = CODEC_TYPE_VIDEO;
+ st->codec->codec_id = CODEC_ID_TIERTEXSEQVIDEO;
+ st->codec->codec_tag = 0; /* no fourcc */
+ st->codec->width = SEQ_FRAME_W;
+ st->codec->height = SEQ_FRAME_H;
+
+ /* initialize the audio decoder stream */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+
+ av_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
+ seq->audio_stream_index = st->index;
+ st->codec->codec_type = CODEC_TYPE_AUDIO;
+ st->codec->codec_id = CODEC_ID_PCM_S16BE;
+ st->codec->codec_tag = 0; /* no tag */
+ st->codec->channels = 1;
+ st->codec->sample_rate = SEQ_SAMPLE_RATE;
+ st->codec->bits_per_sample = 16;
+ st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample * st->codec->channels;
+ st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
+
+ return 0;
+}
+
+static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ int rc;
+ SeqDemuxContext *seq = (SeqDemuxContext *)s->priv_data;
+ ByteIOContext *pb = &s->pb;
+
+ if (!seq->audio_buffer_full) {
+ rc = seq_parse_frame_data(seq, pb);
+ if (rc)
+ return rc;
+
+ /* video packet */
+ if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
+ if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size))
+ return AVERROR_NOMEM;
+
+ pkt->data[0] = 0;
+ if (seq->current_pal_data_size != 0) {
+ pkt->data[0] |= 1;
+ url_fseek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
+ if (get_buffer(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
+ return AVERROR_IO;
+ }
+ if (seq->current_video_data_size != 0) {
+ pkt->data[0] |= 2;
+ memcpy(&pkt->data[1 + seq->current_pal_data_size],
+ seq->current_video_data_ptr,
+ seq->current_video_data_size);
+ }
+ pkt->stream_index = seq->video_stream_index;
+ pkt->pts = seq->current_frame_pts;
+
+ /* sound buffer will be processed on next read_packet() call */
+ seq->audio_buffer_full = 1;
+ return 0;
+ }
+ }
+
+ /* audio packet */
+ if (seq->current_audio_data_offs == 0) /* end of data reached */
+ return AVERROR_IO;
+
+ url_fseek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
+ rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
+ if (rc < 0)
+ return rc;
+
+ pkt->stream_index = seq->audio_stream_index;
+ pkt->pts = seq->current_frame_pts++;
+
+ seq->audio_buffer_full = 0;
+ return 0;
+}
+
+static int seq_read_close(AVFormatContext *s)
+{
+ int i;
+ SeqDemuxContext *seq = (SeqDemuxContext *)s->priv_data;
+
+ for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
+ av_free(seq->frame_buffers[i].data);
+
+ return 0;
+}
+
+AVInputFormat tiertexseq_demuxer = {
+ "tiertexseq",
+ "Tiertex Limited SEQ format",
+ sizeof(SeqDemuxContext),
+ seq_probe,
+ seq_read_header,
+ seq_read_packet,
+ seq_read_close,
+};