| /* | |
| * 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 "demux.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; | |
| unsigned int sample_size; | |
| int64_t sample_offset; | |
| 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(const 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; | |
| 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; | |
| } | |
| if (film->video_type == AV_CODEC_ID_NONE && film->audio_type == AV_CODEC_ID_NONE) | |
| return AVERROR_INVALIDDATA; | |
| /* initialize the decoder streams */ | |
| if (film->video_type != AV_CODEC_ID_NONE) { | |
| st = avformat_new_stream(s, NULL); | |
| if (!st) | |
| return AVERROR(ENOMEM); | |
| film->video_stream_index = st->index; | |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| st->codecpar->codec_id = film->video_type; | |
| st->codecpar->codec_tag = 0; /* no fourcc */ | |
| st->codecpar->width = AV_RB32(&scratch[16]); | |
| st->codecpar->height = AV_RB32(&scratch[12]); | |
| if (film->video_type == AV_CODEC_ID_RAWVIDEO) { | |
| if (scratch[20] == 24) { | |
| st->codecpar->format = 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 != AV_CODEC_ID_NONE) { | |
| st = avformat_new_stream(s, NULL); | |
| if (!st) | |
| return AVERROR(ENOMEM); | |
| film->audio_stream_index = st->index; | |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| st->codecpar->codec_id = film->audio_type; | |
| st->codecpar->codec_tag = 1; | |
| st->codecpar->ch_layout.nb_channels = film->audio_channels; | |
| st->codecpar->sample_rate = film->audio_samplerate; | |
| if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) { | |
| st->codecpar->bits_per_coded_sample = 18 * 8 / 32; | |
| st->codecpar->block_align = film->audio_channels * 18; | |
| ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL; | |
| } else { | |
| st->codecpar->bits_per_coded_sample = film->audio_bits; | |
| st->codecpar->block_align = film->audio_channels * | |
| st->codecpar->bits_per_coded_sample / 8; | |
| } | |
| st->codecpar->bit_rate = film->audio_channels * st->codecpar->sample_rate * | |
| st->codecpar->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]); | |
| 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->codecpar->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) | |
| 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 (film->sample_table[i].sample_size > INT_MAX / 4) | |
| return AVERROR_INVALIDDATA; | |
| 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)); | |
| film->sample_table[i].keyframe = 1; | |
| } 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 : AVINDEX_KEYFRAME; | |
| video_frame_counter++; | |
| if (film->video_type != AV_CODEC_ID_NONE) | |
| 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 != AV_CODEC_ID_NONE) | |
| s->streams[film->audio_stream_index]->duration = audio_frame_counter; | |
| if (film->video_type != AV_CODEC_ID_NONE) | |
| s->streams[film->video_stream_index]->duration = video_frame_counter; | |
| film->current_sample = 0; | |
| return 0; | |
| } | |
| static int film_read_packet(AVFormatContext *s, | |
| AVPacket *pkt) | |
| { | |
| FilmDemuxContext *film = s->priv_data; | |
| AVIOContext *pb = s->pb; | |
| film_sample *sample; | |
| film_sample *next_sample = NULL; | |
| int next_sample_id; | |
| int ret = 0; | |
| if (film->current_sample >= film->sample_count) | |
| return AVERROR_EOF; | |
| sample = &film->sample_table[film->current_sample]; | |
| /* Find the next sample from the same stream, assuming there is one; | |
| * this is used to calculate the duration below */ | |
| next_sample_id = film->current_sample + 1; | |
| while (next_sample == NULL) { | |
| if (next_sample_id >= film->sample_count) | |
| break; | |
| next_sample = &film->sample_table[next_sample_id]; | |
| if (next_sample->stream != sample->stream) { | |
| next_sample = NULL; | |
| next_sample_id++; | |
| } | |
| } | |
| /* 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->dts = sample->pts; | |
| pkt->pts = sample->pts; | |
| pkt->flags |= sample->keyframe ? AV_PKT_FLAG_KEY : 0; | |
| if (next_sample != NULL) | |
| pkt->duration = next_sample->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, ffstream(st)->index_entries[ret].pos, SEEK_SET); | |
| if (pos < 0) | |
| return pos; | |
| film->current_sample = ret; | |
| return 0; | |
| } | |
| const FFInputFormat ff_segafilm_demuxer = { | |
| .p.name = "film_cpk", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"), | |
| .priv_data_size = sizeof(FilmDemuxContext), | |
| .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | |
| .read_probe = film_probe, | |
| .read_header = film_read_header, | |
| .read_packet = film_read_packet, | |
| .read_close = film_read_close, | |
| .read_seek = film_read_seek, | |
| }; |