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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 |
* Tiertex Limited SEQ file demuxer |
*/ |
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#include "libavutil/channel_layout.h" |
#include "avformat.h" |
#include "internal.h" |
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#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 |
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typedef struct TiertexSeqFrameBuffer { |
int fill_size; |
int data_size; |
unsigned char *data; |
} TiertexSeqFrameBuffer; |
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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; |
|
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static int seq_probe(AVProbeData *p) |
{ |
int i; |
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if (p->buf_size < 258) |
return 0; |
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/* 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; |
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if(p->buf[256]==0 && p->buf[257]==0) |
return 0; |
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/* only one fourth of the score since the previous check is too naive */ |
return AVPROBE_SCORE_MAX / 4; |
} |
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static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb) |
{ |
int i, sz; |
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++) { |
sz = avio_rl16(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; |
} |
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static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size) |
{ |
TiertexSeqFrameBuffer *seq_buffer; |
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if (buffer_num >= SEQ_NUM_FRAME_BUFFERS) |
return AVERROR_INVALIDDATA; |
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seq_buffer = &seq->frame_buffers[buffer_num]; |
if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0) |
return AVERROR_INVALIDDATA; |
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avio_seek(pb, seq->current_frame_offs + data_offs, SEEK_SET); |
if (avio_read(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size) |
return AVERROR(EIO); |
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seq_buffer->fill_size += data_size; |
return 0; |
} |
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static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb) |
{ |
unsigned int offset_table[4], buffer_num[4]; |
TiertexSeqFrameBuffer *seq_buffer; |
int i, e, err; |
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seq->current_frame_offs += SEQ_FRAME_SIZE; |
avio_seek(pb, seq->current_frame_offs, SEEK_SET); |
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/* sound data */ |
seq->current_audio_data_offs = avio_rl16(pb); |
if (seq->current_audio_data_offs) { |
seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2; |
} else { |
seq->current_audio_data_size = 0; |
} |
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/* palette data */ |
seq->current_pal_data_offs = avio_rl16(pb); |
if (seq->current_pal_data_offs) { |
seq->current_pal_data_size = 768; |
} else { |
seq->current_pal_data_size = 0; |
} |
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/* video data */ |
for (i = 0; i < 4; i++) |
buffer_num[i] = avio_r8(pb); |
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for (i = 0; i < 4; i++) |
offset_table[i] = avio_rl16(pb); |
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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; |
} |
} |
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if (buffer_num[0] != 255) { |
if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS) |
return AVERROR_INVALIDDATA; |
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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; |
} |
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return 0; |
} |
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static int seq_read_header(AVFormatContext *s) |
{ |
int i, rc; |
SeqDemuxContext *seq = s->priv_data; |
AVIOContext *pb = s->pb; |
AVStream *st; |
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/* init internal buffers */ |
rc = seq_init_frame_buffers(seq, pb); |
if (rc) |
return rc; |
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seq->current_frame_offs = 0; |
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/* 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; |
} |
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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 */ |
st = avformat_new_stream(s, NULL); |
if (!st) |
return AVERROR(ENOMEM); |
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avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE); |
seq->video_stream_index = st->index; |
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
st->codec->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO; |
st->codec->codec_tag = 0; /* no fourcc */ |
st->codec->width = SEQ_FRAME_W; |
st->codec->height = SEQ_FRAME_H; |
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/* initialize the audio decoder stream */ |
st = avformat_new_stream(s, NULL); |
if (!st) |
return AVERROR(ENOMEM); |
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st->start_time = 0; |
avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE); |
seq->audio_stream_index = st->index; |
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
st->codec->codec_id = AV_CODEC_ID_PCM_S16BE; |
st->codec->codec_tag = 0; /* no tag */ |
st->codec->channels = 1; |
st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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 / 8; |
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return 0; |
} |
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static int seq_read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
int rc; |
SeqDemuxContext *seq = s->priv_data; |
AVIOContext *pb = s->pb; |
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if (!seq->audio_buffer_full) { |
rc = seq_parse_frame_data(seq, pb); |
if (rc) |
return rc; |
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/* 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); |
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pkt->data[0] = 0; |
if (seq->current_pal_data_size) { |
pkt->data[0] |= 1; |
avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET); |
if (avio_read(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; |
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/* sound buffer will be processed on next read_packet() call */ |
seq->audio_buffer_full = 1; |
return 0; |
} |
} |
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/* audio packet */ |
if (seq->current_audio_data_offs == 0) /* end of data reached */ |
return AVERROR(EIO); |
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avio_seek(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; |
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pkt->stream_index = seq->audio_stream_index; |
seq->current_frame_pts++; |
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seq->audio_buffer_full = 0; |
return 0; |
} |
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static int seq_read_close(AVFormatContext *s) |
{ |
int i; |
SeqDemuxContext *seq = s->priv_data; |
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for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) |
av_free(seq->frame_buffers[i].data); |
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return 0; |
} |
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AVInputFormat ff_tiertexseq_demuxer = { |
.name = "tiertexseq", |
.long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"), |
.priv_data_size = sizeof(SeqDemuxContext), |
.read_probe = seq_probe, |
.read_header = seq_read_header, |
.read_packet = seq_read_packet, |
.read_close = seq_read_close, |
}; |