| /* |
| * 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 |
| * 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" |
| #include "internal.h" |
| #include "avio_internal.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') |
| #define RAW_TAG MKBETAG('r', 'a', 'w', ' ') |
| |
| typedef struct film_sample { |
| 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 AVCodecID audio_type; |
| unsigned int audio_samplerate; |
| unsigned int audio_bits; |
| unsigned int audio_channels; |
| |
| enum AVCodecID video_type; |
| unsigned int sample_count; |
| film_sample *sample_table; |
| unsigned int current_sample; |
| |
| unsigned int base_clock; |
| unsigned int version; |
| } FilmDemuxContext; |
| |
| static int film_probe(AVProbeData *p) |
| { |
| if (AV_RB32(&p->buf[0]) != FILM_TAG) |
| return 0; |
| |
| if (AV_RB32(&p->buf[16]) != FDSC_TAG) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int film_read_close(AVFormatContext *s) |
| { |
| FilmDemuxContext *film = s->priv_data; |
| |
| av_freep(&film->sample_table); |
| |
| return 0; |
| } |
| |
| static int film_read_header(AVFormatContext *s) |
| { |
| FilmDemuxContext *film = s->priv_data; |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| unsigned char scratch[256]; |
| int i, ret; |
| unsigned int data_offset; |
| unsigned int audio_frame_counter; |
| unsigned int video_frame_counter; |
| |
| film->sample_table = NULL; |
| |
| /* load the main FILM header */ |
| if (avio_read(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 (avio_read(pb, scratch, 20) != 20) |
| return AVERROR(EIO); |
| /* make some assumptions about the audio parameters */ |
| film->audio_type = AV_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 (avio_read(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 (scratch[23] == 2 && film->audio_channels > 0) |
| film->audio_type = AV_CODEC_ID_ADPCM_ADX; |
| else if (film->audio_channels > 0) { |
| if (film->audio_bits == 8) |
| film->audio_type = AV_CODEC_ID_PCM_S8_PLANAR; |
| else if (film->audio_bits == 16) |
| film->audio_type = AV_CODEC_ID_PCM_S16BE_PLANAR; |
| else |
| film->audio_type = AV_CODEC_ID_NONE; |
| } else |
| film->audio_type = AV_CODEC_ID_NONE; |
| } |
| |
| if (AV_RB32(&scratch[0]) != FDSC_TAG) |
| return AVERROR_INVALIDDATA; |
| |
| if (AV_RB32(&scratch[8]) == CVID_TAG) { |
| film->video_type = AV_CODEC_ID_CINEPAK; |
| } else if (AV_RB32(&scratch[8]) == RAW_TAG) { |
| film->video_type = AV_CODEC_ID_RAWVIDEO; |
| } else { |
| film->video_type = AV_CODEC_ID_NONE; |
| } |
| |
| /* initialize the decoder streams */ |
| if (film->video_type) { |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| film->video_stream_index = st->index; |
| st->codec->codec_type = AVMEDIA_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->video_type == AV_CODEC_ID_RAWVIDEO) { |
| if (scratch[20] == 24) { |
| st->codec->pix_fmt = AV_PIX_FMT_RGB24; |
| } else { |
| av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]); |
| return -1; |
| } |
| } |
| } |
| |
| if (film->audio_type) { |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| film->audio_stream_index = st->index; |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = film->audio_type; |
| st->codec->codec_tag = 1; |
| st->codec->channels = film->audio_channels; |
| st->codec->sample_rate = film->audio_samplerate; |
| |
| if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) { |
| st->codec->bits_per_coded_sample = 18 * 8 / 32; |
| st->codec->block_align = st->codec->channels * 18; |
| st->need_parsing = AVSTREAM_PARSE_FULL; |
| } else { |
| st->codec->bits_per_coded_sample = film->audio_bits; |
| st->codec->block_align = st->codec->channels * |
| st->codec->bits_per_coded_sample / 8; |
| } |
| |
| st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * |
| st->codec->bits_per_coded_sample; |
| } |
| |
| /* load the sample table */ |
| if (avio_read(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_array(film->sample_count, sizeof(film_sample)); |
| if (!film->sample_table) |
| return AVERROR(ENOMEM); |
| |
| for (i = 0; i < s->nb_streams; i++) { |
| st = s->streams[i]; |
| if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) |
| avpriv_set_pts_info(st, 33, 1, film->base_clock); |
| else |
| avpriv_set_pts_info(st, 64, 1, film->audio_samplerate); |
| } |
| |
| audio_frame_counter = video_frame_counter = 0; |
| for (i = 0; i < film->sample_count; i++) { |
| /* load the next sample record and transfer it to an internal struct */ |
| if (avio_read(pb, scratch, 16) != 16) { |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| film->sample_table[i].sample_offset = |
| data_offset + AV_RB32(&scratch[0]); |
| film->sample_table[i].sample_size = AV_RB32(&scratch[4]); |
| if (film->sample_table[i].sample_size > INT_MAX / 4) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) { |
| film->sample_table[i].stream = film->audio_stream_index; |
| film->sample_table[i].pts = audio_frame_counter; |
| |
| if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) |
| audio_frame_counter += (film->sample_table[i].sample_size * 32 / |
| (18 * film->audio_channels)); |
| else if (film->audio_type != AV_CODEC_ID_NONE) |
| 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; |
| video_frame_counter++; |
| if (film->video_type) |
| av_add_index_entry(s->streams[film->video_stream_index], |
| film->sample_table[i].sample_offset, |
| film->sample_table[i].pts, |
| film->sample_table[i].sample_size, 0, |
| film->sample_table[i].keyframe); |
| } |
| } |
| |
| if (film->audio_type) |
| s->streams[film->audio_stream_index]->duration = audio_frame_counter; |
| |
| if (film->video_type) |
| s->streams[film->video_stream_index]->duration = video_frame_counter; |
| |
| film->current_sample = 0; |
| |
| return 0; |
| fail: |
| film_read_close(s); |
| return ret; |
| } |
| |
| static int film_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| FilmDemuxContext *film = s->priv_data; |
| AVIOContext *pb = s->pb; |
| film_sample *sample; |
| int ret = 0; |
| |
| if (film->current_sample >= film->sample_count) |
| return AVERROR_EOF; |
| |
| sample = &film->sample_table[film->current_sample]; |
| |
| /* position the stream (will probably be there anyway) */ |
| avio_seek(pb, sample->sample_offset, SEEK_SET); |
| |
| 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_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
| { |
| FilmDemuxContext *film = s->priv_data; |
| AVStream *st = s->streams[stream_index]; |
| int64_t pos; |
| int ret = av_index_search_timestamp(st, timestamp, flags); |
| if (ret < 0) |
| return ret; |
| |
| pos = avio_seek(s->pb, st->index_entries[ret].pos, SEEK_SET); |
| if (pos < 0) |
| return pos; |
| |
| film->current_sample = ret; |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_segafilm_demuxer = { |
| .name = "film_cpk", |
| .long_name = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"), |
| .priv_data_size = sizeof(FilmDemuxContext), |
| .read_probe = film_probe, |
| .read_header = film_read_header, |
| .read_packet = film_read_packet, |
| .read_close = film_read_close, |
| .read_seek = film_read_seek, |
| }; |
