libavformat/tiertexseq.c - vendor/opensource/ffmpeg - Git at Google

 /*
  * 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,
 };
	/*
	* 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,
	};