311 lines
9.9 KiB
C
311 lines
9.9 KiB
C
/*
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* Sega FILM Format (CPK) Demuxer
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* Copyright (c) 2003 The ffmpeg Project
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file segafilm.c
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* Sega FILM (.cpk) file demuxer
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* by Mike Melanson (melanson@pcisys.net)
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* For more information regarding the Sega FILM file format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*/
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#include "avformat.h"
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#define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
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#define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
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#define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
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#define CVID_TAG MKBETAG('c', 'v', 'i', 'd')
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typedef struct {
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int stream;
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offset_t sample_offset;
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unsigned int sample_size;
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int64_t pts;
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int keyframe;
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} film_sample_t;
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typedef struct FilmDemuxContext {
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int video_stream_index;
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int audio_stream_index;
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unsigned int audio_type;
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unsigned int audio_samplerate;
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unsigned int audio_bits;
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unsigned int audio_channels;
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unsigned int video_type;
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unsigned int sample_count;
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film_sample_t *sample_table;
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unsigned int current_sample;
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unsigned int base_clock;
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unsigned int version;
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int cvid_extra_bytes; /* the number of bytes thrown into the Cinepak
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* chunk header to throw off decoders */
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/* buffer used for interleaving stereo PCM data */
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unsigned char *stereo_buffer;
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int stereo_buffer_size;
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} FilmDemuxContext;
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static int film_probe(AVProbeData *p)
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{
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if (p->buf_size < 4)
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return 0;
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if (BE_32(&p->buf[0]) != FILM_TAG)
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int film_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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FilmDemuxContext *film = (FilmDemuxContext *)s->priv_data;
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ByteIOContext *pb = &s->pb;
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AVStream *st;
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unsigned char scratch[256];
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int i;
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unsigned int data_offset;
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unsigned int audio_frame_counter;
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film->sample_table = NULL;
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film->stereo_buffer = NULL;
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film->stereo_buffer_size = 0;
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/* load the main FILM header */
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if (get_buffer(pb, scratch, 16) != 16)
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return -EIO;
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data_offset = BE_32(&scratch[4]);
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film->version = BE_32(&scratch[8]);
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/* load the FDSC chunk */
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if (film->version == 0) {
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/* special case for Lemmings .film files; 20-byte header */
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if (get_buffer(pb, scratch, 20) != 20)
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return -EIO;
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/* make some assumptions about the audio parameters */
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film->audio_type = CODEC_ID_PCM_S8;
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film->audio_samplerate = 22050;
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film->audio_channels = 1;
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film->audio_bits = 8;
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} else {
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/* normal Saturn .cpk files; 32-byte header */
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if (get_buffer(pb, scratch, 32) != 32)
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return -EIO;
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film->audio_samplerate = BE_16(&scratch[24]);;
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film->audio_channels = scratch[21];
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film->audio_bits = scratch[22];
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if (film->audio_bits == 8)
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film->audio_type = CODEC_ID_PCM_S8;
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else if (film->audio_bits == 16)
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film->audio_type = CODEC_ID_PCM_S16BE;
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else
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film->audio_type = 0;
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}
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if (BE_32(&scratch[0]) != FDSC_TAG)
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return AVERROR_INVALIDDATA;
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film->cvid_extra_bytes = 0;
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if (BE_32(&scratch[8]) == CVID_TAG) {
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film->video_type = CODEC_ID_CINEPAK;
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if (film->version)
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film->cvid_extra_bytes = 2;
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else
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film->cvid_extra_bytes = 6; /* Lemmings 3DO case */
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} else
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film->video_type = 0;
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/* initialize the decoder streams */
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if (film->video_type) {
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR_NOMEM;
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film->video_stream_index = st->index;
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st->codec.codec_type = CODEC_TYPE_VIDEO;
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st->codec.codec_id = film->video_type;
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st->codec.codec_tag = 0; /* no fourcc */
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st->codec.width = BE_32(&scratch[16]);
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st->codec.height = BE_32(&scratch[12]);
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}
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if (film->audio_type) {
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR_NOMEM;
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film->audio_stream_index = st->index;
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st->codec.codec_type = CODEC_TYPE_AUDIO;
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st->codec.codec_id = film->audio_type;
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st->codec.codec_tag = 1;
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st->codec.channels = film->audio_channels;
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st->codec.bits_per_sample = film->audio_bits;
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st->codec.sample_rate = film->audio_samplerate;
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st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
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st->codec.bits_per_sample;
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st->codec.block_align = st->codec.channels *
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st->codec.bits_per_sample / 8;
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}
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/* load the sample table */
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if (get_buffer(pb, scratch, 16) != 16)
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return -EIO;
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if (BE_32(&scratch[0]) != STAB_TAG)
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return AVERROR_INVALIDDATA;
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film->base_clock = BE_32(&scratch[8]);
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film->sample_count = BE_32(&scratch[12]);
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film->sample_table = av_malloc(film->sample_count * sizeof(film_sample_t));
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for(i=0; i<s->nb_streams; i++)
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av_set_pts_info(s->streams[i], 33, 1, film->base_clock);
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audio_frame_counter = 0;
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for (i = 0; i < film->sample_count; i++) {
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/* load the next sample record and transfer it to an internal struct */
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if (get_buffer(pb, scratch, 16) != 16) {
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av_free(film->sample_table);
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return -EIO;
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}
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film->sample_table[i].sample_offset =
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data_offset + BE_32(&scratch[0]);
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film->sample_table[i].sample_size = BE_32(&scratch[4]);
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if (BE_32(&scratch[8]) == 0xFFFFFFFF) {
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film->sample_table[i].stream = film->audio_stream_index;
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film->sample_table[i].pts = audio_frame_counter;
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film->sample_table[i].pts *= film->base_clock;
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film->sample_table[i].pts /= film->audio_samplerate;
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audio_frame_counter += (film->sample_table[i].sample_size /
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(film->audio_channels * film->audio_bits / 8));
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} else {
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film->sample_table[i].stream = film->video_stream_index;
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film->sample_table[i].pts = BE_32(&scratch[8]) & 0x7FFFFFFF;
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film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
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}
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}
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film->current_sample = 0;
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return 0;
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}
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static int film_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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FilmDemuxContext *film = (FilmDemuxContext *)s->priv_data;
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ByteIOContext *pb = &s->pb;
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film_sample_t *sample;
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int ret = 0;
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int i;
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int left, right;
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if (film->current_sample >= film->sample_count)
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return -EIO;
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sample = &film->sample_table[film->current_sample];
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/* position the stream (will probably be there anyway) */
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url_fseek(pb, sample->sample_offset, SEEK_SET);
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/* do a special song and dance when loading FILM Cinepak chunks */
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if ((sample->stream == film->video_stream_index) &&
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(film->video_type == CODEC_ID_CINEPAK)) {
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if (av_new_packet(pkt, sample->sample_size - film->cvid_extra_bytes))
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return AVERROR_NOMEM;
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ret = get_buffer(pb, pkt->data, 10);
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/* skip the non-spec CVID bytes */
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url_fseek(pb, film->cvid_extra_bytes, SEEK_CUR);
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ret += get_buffer(pb, pkt->data + 10,
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sample->sample_size - 10 - film->cvid_extra_bytes);
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if (ret != sample->sample_size - film->cvid_extra_bytes)
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ret = -EIO;
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} else if ((sample->stream == film->audio_stream_index) &&
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(film->audio_channels == 2)) {
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/* stereo PCM needs to be interleaved */
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if (av_new_packet(pkt, sample->sample_size))
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return AVERROR_NOMEM;
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/* make sure the interleave buffer is large enough */
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if (sample->sample_size > film->stereo_buffer_size) {
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av_free(film->stereo_buffer);
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film->stereo_buffer_size = sample->sample_size;
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film->stereo_buffer = av_malloc(film->stereo_buffer_size);
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}
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ret = get_buffer(pb, film->stereo_buffer, sample->sample_size);
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if (ret != sample->sample_size)
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ret = -EIO;
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left = 0;
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right = sample->sample_size / 2;
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for (i = 0; i < sample->sample_size; ) {
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if (film->audio_bits == 8) {
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pkt->data[i++] = film->stereo_buffer[left++];
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pkt->data[i++] = film->stereo_buffer[right++];
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} else {
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pkt->data[i++] = film->stereo_buffer[left++];
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pkt->data[i++] = film->stereo_buffer[left++];
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pkt->data[i++] = film->stereo_buffer[right++];
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pkt->data[i++] = film->stereo_buffer[right++];
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}
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}
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} else {
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if (av_new_packet(pkt, sample->sample_size))
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return AVERROR_NOMEM;
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ret = get_buffer(pb, pkt->data, sample->sample_size);
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if (ret != sample->sample_size)
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ret = -EIO;
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}
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pkt->stream_index = sample->stream;
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pkt->pts = sample->pts;
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film->current_sample++;
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return ret;
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}
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static int film_read_close(AVFormatContext *s)
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{
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FilmDemuxContext *film = (FilmDemuxContext *)s->priv_data;
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av_free(film->sample_table);
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av_free(film->stereo_buffer);
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return 0;
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}
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static AVInputFormat film_iformat = {
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"film_cpk",
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"Sega FILM/CPK format",
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sizeof(FilmDemuxContext),
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film_probe,
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film_read_header,
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film_read_packet,
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film_read_close,
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};
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int film_init(void)
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{
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av_register_input_format(&film_iformat);
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return 0;
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}
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