/* * 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 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 "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; offset_t sample_offset; unsigned int sample_size; int64_t pts; int keyframe; } film_sample_t; typedef struct FilmDemuxContext { int video_stream_index; int audio_stream_index; unsigned int audio_type; unsigned int audio_samplerate; unsigned int audio_bits; unsigned int audio_channels; unsigned int video_type; unsigned int sample_count; film_sample_t *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 = 0; } 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 = 0; /* 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_t)) return -1; film->sample_table = av_malloc(film->sample_count * sizeof(film_sample_t)); 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_t *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, };