diff options
author | Baptiste Coudurier <baptiste.coudurier@gmail.com> | 2006-10-12 16:02:58 +0400 |
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committer | Baptiste Coudurier <baptiste.coudurier@gmail.com> | 2006-10-12 16:02:58 +0400 |
commit | 29f86228a0d77bd6f62e66334b732650396f9571 (patch) | |
tree | ce42c2d42c4bbdd71bbc2016c34c01f4051c7683 /libavformat/tiertexseq.c | |
parent | 7da4d4cdeca48667378b96a451621fc9aa76664b (diff) |
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.c | 305 |
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, +}; |