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ffmpeg/libavformat/tiertexseq.c

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/*
* 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 libavformat/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 < 258)
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[i])
return 0;
if(p->buf[256]==0 && p->buf[257]==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(ENOMEM);
}
}
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 || data_size <= 0)
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(EIO);
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, err;
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) {
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) {
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]) {
for (e = i + 1; e < 3 && offset_table[e] == 0; e++);
err = seq_fill_buffer(seq, pb, buffer_num[1 + i],
offset_table[i],
offset_table[e] - offset_table[i]);
if (err)
return err;
}
}
if (buffer_num[0] != 255) {
if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
return AVERROR_INVALIDDATA;
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 = 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(ENOMEM);
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(ENOMEM);
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_coded_sample = 16;
st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
return 0;
}
static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int rc;
SeqDemuxContext *seq = 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(ENOMEM);
pkt->data[0] = 0;
if (seq->current_pal_data_size) {
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(EIO);
}
if (seq->current_video_data_size) {
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(EIO);
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;
seq->current_frame_pts++;
seq->audio_buffer_full = 0;
return 0;
}
static int seq_read_close(AVFormatContext *s)
{
int i;
SeqDemuxContext *seq = 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",
NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ format"),
sizeof(SeqDemuxContext),
seq_probe,
seq_read_header,
seq_read_packet,
seq_read_close,
};
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