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

 /*
  * Sega FILM Format (CPK) Demuxer
  * Copyright (c) 2003 The ffmpeg Project
  *
  * 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/segafilm.c
  * Sega FILM (.cpk) file demuxer
  * by Mike Melanson (melanson@pcisys.net)
  * For more information regarding the Sega FILM file format, visit:
  *   http://www.pcisys.net/~melanson/codecs/
  */

 #include "libavutil/intreadwrite.h"
 #include "avformat.h"

 #define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
 #define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
 #define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
 #define CVID_TAG MKBETAG('c', 'v', 'i', 'd')

 typedef struct {
   int stream;
   int64_t sample_offset;
   unsigned int sample_size;
   int64_t pts;
   int keyframe;
 } film_sample;

 typedef struct FilmDemuxContext {
     int video_stream_index;
     int audio_stream_index;

     enum CodecID audio_type;
     unsigned int audio_samplerate;
     unsigned int audio_bits;
     unsigned int audio_channels;

     enum CodecID video_type;
     unsigned int sample_count;
     film_sample *sample_table;
     unsigned int current_sample;

     unsigned int base_clock;
     unsigned int version;

     /* buffer used for interleaving stereo PCM data */
     unsigned char *stereo_buffer;
     int stereo_buffer_size;
 } FilmDemuxContext;

 static int film_probe(AVProbeData *p)
 {
     if (AV_RB32(&p->buf[0]) != FILM_TAG)
         return 0;

     return AVPROBE_SCORE_MAX;
 }

 static int film_read_header(AVFormatContext *s,
                             AVFormatParameters *ap)
 {
     FilmDemuxContext *film = s->priv_data;
     ByteIOContext *pb = s->pb;
     AVStream *st;
     unsigned char scratch[256];
     int i;
     unsigned int data_offset;
     unsigned int audio_frame_counter;

     film->sample_table = NULL;
     film->stereo_buffer = NULL;
     film->stereo_buffer_size = 0;

     /* load the main FILM header */
     if (get_buffer(pb, scratch, 16) != 16)
         return AVERROR(EIO);
     data_offset = AV_RB32(&scratch[4]);
     film->version = AV_RB32(&scratch[8]);

     /* load the FDSC chunk */
     if (film->version == 0) {
         /* special case for Lemmings .film files; 20-byte header */
         if (get_buffer(pb, scratch, 20) != 20)
             return AVERROR(EIO);
         /* make some assumptions about the audio parameters */
         film->audio_type = CODEC_ID_PCM_S8;
         film->audio_samplerate = 22050;
         film->audio_channels = 1;
         film->audio_bits = 8;
     } else {
         /* normal Saturn .cpk files; 32-byte header */
         if (get_buffer(pb, scratch, 32) != 32)
             return AVERROR(EIO);
         film->audio_samplerate = AV_RB16(&scratch[24]);
         film->audio_channels = scratch[21];
         film->audio_bits = scratch[22];
         if (film->audio_bits == 8)
             film->audio_type = CODEC_ID_PCM_S8;
         else if (film->audio_bits == 16)
             film->audio_type = CODEC_ID_PCM_S16BE;
         else
             film->audio_type = CODEC_ID_NONE;
     }

     if (AV_RB32(&scratch[0]) != FDSC_TAG)
         return AVERROR_INVALIDDATA;

     if (AV_RB32(&scratch[8]) == CVID_TAG) {
         film->video_type = CODEC_ID_CINEPAK;
     } else
         film->video_type = CODEC_ID_NONE;

     /* initialize the decoder streams */
     if (film->video_type) {
         st = av_new_stream(s, 0);
         if (!st)
             return AVERROR(ENOMEM);
         film->video_stream_index = st->index;
         st->codec->codec_type = CODEC_TYPE_VIDEO;
         st->codec->codec_id = film->video_type;
         st->codec->codec_tag = 0;  /* no fourcc */
         st->codec->width = AV_RB32(&scratch[16]);
         st->codec->height = AV_RB32(&scratch[12]);
     }

     if (film->audio_type) {
         st = av_new_stream(s, 0);
         if (!st)
             return AVERROR(ENOMEM);
         film->audio_stream_index = st->index;
         st->codec->codec_type = CODEC_TYPE_AUDIO;
         st->codec->codec_id = film->audio_type;
         st->codec->codec_tag = 1;
         st->codec->channels = film->audio_channels;
         st->codec->bits_per_coded_sample = film->audio_bits;
         st->codec->sample_rate = film->audio_samplerate;
         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
             st->codec->bits_per_coded_sample;
         st->codec->block_align = st->codec->channels *
             st->codec->bits_per_coded_sample / 8;
     }

     /* load the sample table */
     if (get_buffer(pb, scratch, 16) != 16)
         return AVERROR(EIO);
     if (AV_RB32(&scratch[0]) != STAB_TAG)
         return AVERROR_INVALIDDATA;
     film->base_clock = AV_RB32(&scratch[8]);
     film->sample_count = AV_RB32(&scratch[12]);
     if(film->sample_count >= UINT_MAX / sizeof(film_sample))
         return -1;
     film->sample_table = av_malloc(film->sample_count * sizeof(film_sample));

     for(i=0; i<s->nb_streams; i++)
         av_set_pts_info(s->streams[i], 33, 1, film->base_clock);

     audio_frame_counter = 0;
     for (i = 0; i < film->sample_count; i++) {
         /* load the next sample record and transfer it to an internal struct */
         if (get_buffer(pb, scratch, 16) != 16) {
             av_free(film->sample_table);
             return AVERROR(EIO);
         }
         film->sample_table[i].sample_offset =
             data_offset + AV_RB32(&scratch[0]);
         film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
         if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
             film->sample_table[i].stream = film->audio_stream_index;
             film->sample_table[i].pts = audio_frame_counter;
             film->sample_table[i].pts *= film->base_clock;
             film->sample_table[i].pts /= film->audio_samplerate;

             audio_frame_counter += (film->sample_table[i].sample_size /
                 (film->audio_channels * film->audio_bits / 8));
         } else {
             film->sample_table[i].stream = film->video_stream_index;
             film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
             film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
         }
     }

     film->current_sample = 0;

     return 0;
 }

 static int film_read_packet(AVFormatContext *s,
                             AVPacket *pkt)
 {
     FilmDemuxContext *film = s->priv_data;
     ByteIOContext *pb = s->pb;
     film_sample *sample;
     int ret = 0;
     int i;
     int left, right;

     if (film->current_sample >= film->sample_count)
         return AVERROR(EIO);

     sample = &film->sample_table[film->current_sample];

     /* position the stream (will probably be there anyway) */
     url_fseek(pb, sample->sample_offset, SEEK_SET);

     /* do a special song and dance when loading FILM Cinepak chunks */
     if ((sample->stream == film->video_stream_index) &&
         (film->video_type == CODEC_ID_CINEPAK)) {
         pkt->pos= url_ftell(pb);
         if (av_new_packet(pkt, sample->sample_size))
             return AVERROR(ENOMEM);
         get_buffer(pb, pkt->data, sample->sample_size);
     } else if ((sample->stream == film->audio_stream_index) &&
         (film->audio_channels == 2)) {
         /* stereo PCM needs to be interleaved */

         if (av_new_packet(pkt, sample->sample_size))
             return AVERROR(ENOMEM);

         /* make sure the interleave buffer is large enough */
         if (sample->sample_size > film->stereo_buffer_size) {
             av_free(film->stereo_buffer);
             film->stereo_buffer_size = sample->sample_size;
             film->stereo_buffer = av_malloc(film->stereo_buffer_size);
         }

         pkt->pos= url_ftell(pb);
         ret = get_buffer(pb, film->stereo_buffer, sample->sample_size);
         if (ret != sample->sample_size)
             ret = AVERROR(EIO);

         left = 0;
         right = sample->sample_size / 2;
         for (i = 0; i < sample->sample_size; ) {
             if (film->audio_bits == 8) {
                 pkt->data[i++] = film->stereo_buffer[left++];
                 pkt->data[i++] = film->stereo_buffer[right++];
             } else {
                 pkt->data[i++] = film->stereo_buffer[left++];
                 pkt->data[i++] = film->stereo_buffer[left++];
                 pkt->data[i++] = film->stereo_buffer[right++];
                 pkt->data[i++] = film->stereo_buffer[right++];
             }
         }
     } else {
         ret= av_get_packet(pb, pkt, sample->sample_size);
         if (ret != sample->sample_size)
             ret = AVERROR(EIO);
     }

     pkt->stream_index = sample->stream;
     pkt->pts = sample->pts;

     film->current_sample++;

     return ret;
 }

 static int film_read_close(AVFormatContext *s)
 {
     FilmDemuxContext *film = s->priv_data;

     av_free(film->sample_table);
     av_free(film->stereo_buffer);

     return 0;
 }

 AVInputFormat segafilm_demuxer = {
     "film_cpk",
     NULL_IF_CONFIG_SMALL("Sega FILM/CPK format"),
     sizeof(FilmDemuxContext),
     film_probe,
     film_read_header,
     film_read_packet,
     film_read_close,
 };
	/*
	* Sega FILM Format (CPK) Demuxer
	* Copyright (c) 2003 The ffmpeg Project
	*
	* 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/segafilm.c
	* Sega FILM (.cpk) file demuxer
	* by Mike Melanson (melanson@pcisys.net)
	* For more information regarding the Sega FILM file format, visit:
	* http://www.pcisys.net/~melanson/codecs/
	*/

	#include "libavutil/intreadwrite.h"
	#include "avformat.h"

	#define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
	#define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
	#define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
	#define CVID_TAG MKBETAG('c', 'v', 'i', 'd')

	typedef struct {
	int stream;
	int64_t sample_offset;
	unsigned int sample_size;
	int64_t pts;
	int keyframe;
	} film_sample;

	typedef struct FilmDemuxContext {
	int video_stream_index;
	int audio_stream_index;

	enum CodecID audio_type;
	unsigned int audio_samplerate;
	unsigned int audio_bits;
	unsigned int audio_channels;

	enum CodecID video_type;
	unsigned int sample_count;
	film_sample *sample_table;
	unsigned int current_sample;

	unsigned int base_clock;
	unsigned int version;

	/* buffer used for interleaving stereo PCM data */
	unsigned char *stereo_buffer;
	int stereo_buffer_size;
	} FilmDemuxContext;

	static int film_probe(AVProbeData *p)
	{
	if (AV_RB32(&p->buf[0]) != FILM_TAG)
	return 0;

	return AVPROBE_SCORE_MAX;
	}

	static int film_read_header(AVFormatContext *s,
	AVFormatParameters *ap)
	{
	FilmDemuxContext *film = s->priv_data;
	ByteIOContext *pb = s->pb;
	AVStream *st;
	unsigned char scratch[256];
	int i;
	unsigned int data_offset;
	unsigned int audio_frame_counter;

	film->sample_table = NULL;
	film->stereo_buffer = NULL;
	film->stereo_buffer_size = 0;

	/* load the main FILM header */
	if (get_buffer(pb, scratch, 16) != 16)
	return AVERROR(EIO);
	data_offset = AV_RB32(&scratch[4]);
	film->version = AV_RB32(&scratch[8]);

	/* load the FDSC chunk */
	if (film->version == 0) {
	/* special case for Lemmings .film files; 20-byte header */
	if (get_buffer(pb, scratch, 20) != 20)
	return AVERROR(EIO);
	/* make some assumptions about the audio parameters */
	film->audio_type = CODEC_ID_PCM_S8;
	film->audio_samplerate = 22050;
	film->audio_channels = 1;
	film->audio_bits = 8;
	} else {
	/* normal Saturn .cpk files; 32-byte header */
	if (get_buffer(pb, scratch, 32) != 32)
	return AVERROR(EIO);
	film->audio_samplerate = AV_RB16(&scratch[24]);
	film->audio_channels = scratch[21];
	film->audio_bits = scratch[22];
	if (film->audio_bits == 8)
	film->audio_type = CODEC_ID_PCM_S8;
	else if (film->audio_bits == 16)
	film->audio_type = CODEC_ID_PCM_S16BE;
	else
	film->audio_type = CODEC_ID_NONE;
	}

	if (AV_RB32(&scratch[0]) != FDSC_TAG)
	return AVERROR_INVALIDDATA;

	if (AV_RB32(&scratch[8]) == CVID_TAG) {
	film->video_type = CODEC_ID_CINEPAK;
	} else
	film->video_type = CODEC_ID_NONE;

	/* initialize the decoder streams */
	if (film->video_type) {
	st = av_new_stream(s, 0);
	if (!st)
	return AVERROR(ENOMEM);
	film->video_stream_index = st->index;
	st->codec->codec_type = CODEC_TYPE_VIDEO;
	st->codec->codec_id = film->video_type;
	st->codec->codec_tag = 0; /* no fourcc */
	st->codec->width = AV_RB32(&scratch[16]);
	st->codec->height = AV_RB32(&scratch[12]);
	}

	if (film->audio_type) {
	st = av_new_stream(s, 0);
	if (!st)
	return AVERROR(ENOMEM);
	film->audio_stream_index = st->index;
	st->codec->codec_type = CODEC_TYPE_AUDIO;
	st->codec->codec_id = film->audio_type;
	st->codec->codec_tag = 1;
	st->codec->channels = film->audio_channels;
	st->codec->bits_per_coded_sample = film->audio_bits;
	st->codec->sample_rate = film->audio_samplerate;
	st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
	st->codec->bits_per_coded_sample;
	st->codec->block_align = st->codec->channels *
	st->codec->bits_per_coded_sample / 8;
	}

	/* load the sample table */
	if (get_buffer(pb, scratch, 16) != 16)
	return AVERROR(EIO);
	if (AV_RB32(&scratch[0]) != STAB_TAG)
	return AVERROR_INVALIDDATA;
	film->base_clock = AV_RB32(&scratch[8]);
	film->sample_count = AV_RB32(&scratch[12]);
	if(film->sample_count >= UINT_MAX / sizeof(film_sample))
	return -1;
	film->sample_table = av_malloc(film->sample_count * sizeof(film_sample));

	for(i=0; i<s->nb_streams; i++)
	av_set_pts_info(s->streams[i], 33, 1, film->base_clock);

	audio_frame_counter = 0;
	for (i = 0; i < film->sample_count; i++) {
	/* load the next sample record and transfer it to an internal struct */
	if (get_buffer(pb, scratch, 16) != 16) {
	av_free(film->sample_table);
	return AVERROR(EIO);
	}
	film->sample_table[i].sample_offset =
	data_offset + AV_RB32(&scratch[0]);
	film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
	if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
	film->sample_table[i].stream = film->audio_stream_index;
	film->sample_table[i].pts = audio_frame_counter;
	film->sample_table[i].pts *= film->base_clock;
	film->sample_table[i].pts /= film->audio_samplerate;

	audio_frame_counter += (film->sample_table[i].sample_size /
	(film->audio_channels * film->audio_bits / 8));
	} else {
	film->sample_table[i].stream = film->video_stream_index;
	film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
	film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
	}
	}

	film->current_sample = 0;

	return 0;
	}

	static int film_read_packet(AVFormatContext *s,
	AVPacket *pkt)
	{
	FilmDemuxContext *film = s->priv_data;
	ByteIOContext *pb = s->pb;
	film_sample *sample;
	int ret = 0;
	int i;
	int left, right;

	if (film->current_sample >= film->sample_count)
	return AVERROR(EIO);

	sample = &film->sample_table[film->current_sample];

	/* position the stream (will probably be there anyway) */
	url_fseek(pb, sample->sample_offset, SEEK_SET);

	/* do a special song and dance when loading FILM Cinepak chunks */
	if ((sample->stream == film->video_stream_index) &&
	(film->video_type == CODEC_ID_CINEPAK)) {
	pkt->pos= url_ftell(pb);
	if (av_new_packet(pkt, sample->sample_size))
	return AVERROR(ENOMEM);
	get_buffer(pb, pkt->data, sample->sample_size);
	} else if ((sample->stream == film->audio_stream_index) &&
	(film->audio_channels == 2)) {
	/* stereo PCM needs to be interleaved */

	if (av_new_packet(pkt, sample->sample_size))
	return AVERROR(ENOMEM);

	/* make sure the interleave buffer is large enough */
	if (sample->sample_size > film->stereo_buffer_size) {
	av_free(film->stereo_buffer);
	film->stereo_buffer_size = sample->sample_size;
	film->stereo_buffer = av_malloc(film->stereo_buffer_size);
	}

	pkt->pos= url_ftell(pb);
	ret = get_buffer(pb, film->stereo_buffer, sample->sample_size);
	if (ret != sample->sample_size)
	ret = AVERROR(EIO);

	left = 0;
	right = sample->sample_size / 2;
	for (i = 0; i < sample->sample_size; ) {
	if (film->audio_bits == 8) {
	pkt->data[i++] = film->stereo_buffer[left++];
	pkt->data[i++] = film->stereo_buffer[right++];
	} else {
	pkt->data[i++] = film->stereo_buffer[left++];
	pkt->data[i++] = film->stereo_buffer[left++];
	pkt->data[i++] = film->stereo_buffer[right++];
	pkt->data[i++] = film->stereo_buffer[right++];
	}
	}
	} else {
	ret= av_get_packet(pb, pkt, sample->sample_size);
	if (ret != sample->sample_size)
	ret = AVERROR(EIO);
	}

	pkt->stream_index = sample->stream;
	pkt->pts = sample->pts;

	film->current_sample++;

	return ret;
	}

	static int film_read_close(AVFormatContext *s)
	{
	FilmDemuxContext *film = s->priv_data;

	av_free(film->sample_table);
	av_free(film->stereo_buffer);

	return 0;
	}

	AVInputFormat segafilm_demuxer = {
	"film_cpk",
	NULL_IF_CONFIG_SMALL("Sega FILM/CPK format"),
	sizeof(FilmDemuxContext),
	film_probe,
	film_read_header,
	film_read_packet,
	film_read_close,
	};