yading@11: /*
yading@11:  * Tiertex Limited SEQ File Demuxer
yading@11:  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Tiertex Limited SEQ file demuxer
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: #define SEQ_FRAME_SIZE         6144
yading@11: #define SEQ_FRAME_W            256
yading@11: #define SEQ_FRAME_H            128
yading@11: #define SEQ_NUM_FRAME_BUFFERS  30
yading@11: #define SEQ_AUDIO_BUFFER_SIZE  882
yading@11: #define SEQ_SAMPLE_RATE        22050
yading@11: #define SEQ_FRAME_RATE         25
yading@11: 
yading@11: 
yading@11: typedef struct TiertexSeqFrameBuffer {
yading@11:     int fill_size;
yading@11:     int data_size;
yading@11:     unsigned char *data;
yading@11: } TiertexSeqFrameBuffer;
yading@11: 
yading@11: typedef struct SeqDemuxContext {
yading@11:     int audio_stream_index;
yading@11:     int video_stream_index;
yading@11:     int current_frame_pts;
yading@11:     int current_frame_offs;
yading@11:     TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS];
yading@11:     int frame_buffers_count;
yading@11:     unsigned int current_audio_data_size;
yading@11:     unsigned int current_audio_data_offs;
yading@11:     unsigned int current_pal_data_size;
yading@11:     unsigned int current_pal_data_offs;
yading@11:     unsigned int current_video_data_size;
yading@11:     unsigned char *current_video_data_ptr;
yading@11:     int audio_buffer_full;
yading@11: } SeqDemuxContext;
yading@11: 
yading@11: 
yading@11: static int seq_probe(AVProbeData *p)
yading@11: {
yading@11:     int i;
yading@11: 
yading@11:     if (p->buf_size < 258)
yading@11:         return 0;
yading@11: 
yading@11:     /* there's no real header in a .seq file, the only thing they have in common */
yading@11:     /* is the first 256 bytes of the file which are always filled with 0 */
yading@11:     for (i = 0; i < 256; i++)
yading@11:         if (p->buf[i])
yading@11:             return 0;
yading@11: 
yading@11:     if(p->buf[256]==0 && p->buf[257]==0)
yading@11:         return 0;
yading@11: 
yading@11:     /* only one fourth of the score since the previous check is too naive */
yading@11:     return AVPROBE_SCORE_MAX / 4;
yading@11: }
yading@11: 
yading@11: static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
yading@11: {
yading@11:     int i, sz;
yading@11:     TiertexSeqFrameBuffer *seq_buffer;
yading@11: 
yading@11:     avio_seek(pb, 256, SEEK_SET);
yading@11: 
yading@11:     for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
yading@11:         sz = avio_rl16(pb);
yading@11:         if (sz == 0)
yading@11:             break;
yading@11:         else {
yading@11:             seq_buffer = &seq->frame_buffers[i];
yading@11:             seq_buffer->fill_size = 0;
yading@11:             seq_buffer->data_size = sz;
yading@11:             seq_buffer->data = av_malloc(sz);
yading@11:             if (!seq_buffer->data)
yading@11:                 return AVERROR(ENOMEM);
yading@11:         }
yading@11:     }
yading@11:     seq->frame_buffers_count = i;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
yading@11: {
yading@11:     TiertexSeqFrameBuffer *seq_buffer;
yading@11: 
yading@11:     if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     seq_buffer = &seq->frame_buffers[buffer_num];
yading@11:     if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     avio_seek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
yading@11:     if (avio_read(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
yading@11:         return AVERROR(EIO);
yading@11: 
yading@11:     seq_buffer->fill_size += data_size;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
yading@11: {
yading@11:     unsigned int offset_table[4], buffer_num[4];
yading@11:     TiertexSeqFrameBuffer *seq_buffer;
yading@11:     int i, e, err;
yading@11: 
yading@11:     seq->current_frame_offs += SEQ_FRAME_SIZE;
yading@11:     avio_seek(pb, seq->current_frame_offs, SEEK_SET);
yading@11: 
yading@11:     /* sound data */
yading@11:     seq->current_audio_data_offs = avio_rl16(pb);
yading@11:     if (seq->current_audio_data_offs) {
yading@11:         seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
yading@11:     } else {
yading@11:         seq->current_audio_data_size = 0;
yading@11:     }
yading@11: 
yading@11:     /* palette data */
yading@11:     seq->current_pal_data_offs = avio_rl16(pb);
yading@11:     if (seq->current_pal_data_offs) {
yading@11:         seq->current_pal_data_size = 768;
yading@11:     } else {
yading@11:         seq->current_pal_data_size = 0;
yading@11:     }
yading@11: 
yading@11:     /* video data */
yading@11:     for (i = 0; i < 4; i++)
yading@11:         buffer_num[i] = avio_r8(pb);
yading@11: 
yading@11:     for (i = 0; i < 4; i++)
yading@11:         offset_table[i] = avio_rl16(pb);
yading@11: 
yading@11:     for (i = 0; i < 3; i++) {
yading@11:         if (offset_table[i]) {
yading@11:             for (e = i + 1; e < 3 && offset_table[e] == 0; e++);
yading@11:             err = seq_fill_buffer(seq, pb, buffer_num[1 + i],
yading@11:               offset_table[i],
yading@11:               offset_table[e] - offset_table[i]);
yading@11:             if (err)
yading@11:                 return err;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (buffer_num[0] != 255) {
yading@11:         if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         seq_buffer = &seq->frame_buffers[buffer_num[0]];
yading@11:         seq->current_video_data_size = seq_buffer->fill_size;
yading@11:         seq->current_video_data_ptr  = seq_buffer->data;
yading@11:         seq_buffer->fill_size = 0;
yading@11:     } else {
yading@11:         seq->current_video_data_size = 0;
yading@11:         seq->current_video_data_ptr  = 0;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int seq_read_header(AVFormatContext *s)
yading@11: {
yading@11:     int i, rc;
yading@11:     SeqDemuxContext *seq = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream *st;
yading@11: 
yading@11:     /* init internal buffers */
yading@11:     rc = seq_init_frame_buffers(seq, pb);
yading@11:     if (rc)
yading@11:         return rc;
yading@11: 
yading@11:     seq->current_frame_offs = 0;
yading@11: 
yading@11:     /* preload (no audio data, just buffer operations related data) */
yading@11:     for (i = 1; i <= 100; i++) {
yading@11:         rc = seq_parse_frame_data(seq, pb);
yading@11:         if (rc)
yading@11:             return rc;
yading@11:     }
yading@11: 
yading@11:     seq->current_frame_pts = 0;
yading@11: 
yading@11:     seq->audio_buffer_full = 0;
yading@11: 
yading@11:     /* initialize the video decoder stream */
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
yading@11:     seq->video_stream_index = st->index;
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO;
yading@11:     st->codec->codec_tag = 0;  /* no fourcc */
yading@11:     st->codec->width = SEQ_FRAME_W;
yading@11:     st->codec->height = SEQ_FRAME_H;
yading@11: 
yading@11:     /* initialize the audio decoder stream */
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     st->start_time = 0;
yading@11:     avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
yading@11:     seq->audio_stream_index = st->index;
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
yading@11:     st->codec->codec_tag = 0;  /* no tag */
yading@11:     st->codec->channels = 1;
yading@11:     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:     st->codec->sample_rate = SEQ_SAMPLE_RATE;
yading@11:     st->codec->bits_per_coded_sample = 16;
yading@11:     st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
yading@11:     st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample / 8;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     int rc;
yading@11:     SeqDemuxContext *seq = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11: 
yading@11:     if (!seq->audio_buffer_full) {
yading@11:         rc = seq_parse_frame_data(seq, pb);
yading@11:         if (rc)
yading@11:             return rc;
yading@11: 
yading@11:         /* video packet */
yading@11:         if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
yading@11:             if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size))
yading@11:                 return AVERROR(ENOMEM);
yading@11: 
yading@11:             pkt->data[0] = 0;
yading@11:             if (seq->current_pal_data_size) {
yading@11:                 pkt->data[0] |= 1;
yading@11:                 avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
yading@11:                 if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
yading@11:                     return AVERROR(EIO);
yading@11:             }
yading@11:             if (seq->current_video_data_size) {
yading@11:                 pkt->data[0] |= 2;
yading@11:                 memcpy(&pkt->data[1 + seq->current_pal_data_size],
yading@11:                   seq->current_video_data_ptr,
yading@11:                   seq->current_video_data_size);
yading@11:             }
yading@11:             pkt->stream_index = seq->video_stream_index;
yading@11:             pkt->pts = seq->current_frame_pts;
yading@11: 
yading@11:             /* sound buffer will be processed on next read_packet() call */
yading@11:             seq->audio_buffer_full = 1;
yading@11:             return 0;
yading@11:        }
yading@11:     }
yading@11: 
yading@11:     /* audio packet */
yading@11:     if (seq->current_audio_data_offs == 0) /* end of data reached */
yading@11:         return AVERROR(EIO);
yading@11: 
yading@11:     avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
yading@11:     rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
yading@11:     if (rc < 0)
yading@11:         return rc;
yading@11: 
yading@11:     pkt->stream_index = seq->audio_stream_index;
yading@11:     seq->current_frame_pts++;
yading@11: 
yading@11:     seq->audio_buffer_full = 0;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int seq_read_close(AVFormatContext *s)
yading@11: {
yading@11:     int i;
yading@11:     SeqDemuxContext *seq = s->priv_data;
yading@11: 
yading@11:     for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
yading@11:         av_free(seq->frame_buffers[i].data);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_tiertexseq_demuxer = {
yading@11:     .name           = "tiertexseq",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"),
yading@11:     .priv_data_size = sizeof(SeqDemuxContext),
yading@11:     .read_probe     = seq_probe,
yading@11:     .read_header    = seq_read_header,
yading@11:     .read_packet    = seq_read_packet,
yading@11:     .read_close     = seq_read_close,
yading@11: };