343 lines
11 KiB
C
343 lines
11 KiB
C
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/*
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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 file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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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 "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#include "avio_internal.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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#define RAW_TAG MKBETAG('r', 'a', 'w', ' ')
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typedef struct film_sample {
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int stream;
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int64_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;
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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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enum AVCodecID 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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enum AVCodecID video_type;
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unsigned int sample_count;
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film_sample *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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} FilmDemuxContext;
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static int film_probe(const AVProbeData *p)
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{
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if (AV_RB32(&p->buf[0]) != FILM_TAG)
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return 0;
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if (AV_RB32(&p->buf[16]) != FDSC_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_close(AVFormatContext *s)
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{
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FilmDemuxContext *film = s->priv_data;
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av_freep(&film->sample_table);
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return 0;
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}
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static int film_read_header(AVFormatContext *s)
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{
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FilmDemuxContext *film = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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unsigned char scratch[256];
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int i, ret;
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unsigned int data_offset;
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unsigned int audio_frame_counter;
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unsigned int video_frame_counter;
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film->sample_table = NULL;
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/* load the main FILM header */
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if (avio_read(pb, scratch, 16) != 16)
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return AVERROR(EIO);
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data_offset = AV_RB32(&scratch[4]);
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film->version = AV_RB32(&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 (avio_read(pb, scratch, 20) != 20)
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return AVERROR(EIO);
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/* make some assumptions about the audio parameters */
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film->audio_type = AV_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 (avio_read(pb, scratch, 32) != 32)
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return AVERROR(EIO);
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film->audio_samplerate = AV_RB16(&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 (scratch[23] == 2 && film->audio_channels > 0)
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film->audio_type = AV_CODEC_ID_ADPCM_ADX;
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else if (film->audio_channels > 0) {
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if (film->audio_bits == 8)
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film->audio_type = AV_CODEC_ID_PCM_S8_PLANAR;
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else if (film->audio_bits == 16)
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film->audio_type = AV_CODEC_ID_PCM_S16BE_PLANAR;
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else
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film->audio_type = AV_CODEC_ID_NONE;
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} else
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film->audio_type = AV_CODEC_ID_NONE;
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}
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if (AV_RB32(&scratch[0]) != FDSC_TAG)
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return AVERROR_INVALIDDATA;
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if (AV_RB32(&scratch[8]) == CVID_TAG) {
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film->video_type = AV_CODEC_ID_CINEPAK;
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} else if (AV_RB32(&scratch[8]) == RAW_TAG) {
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film->video_type = AV_CODEC_ID_RAWVIDEO;
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} else {
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film->video_type = AV_CODEC_ID_NONE;
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}
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/* initialize the decoder streams */
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if (film->video_type) {
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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film->video_stream_index = st->index;
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = film->video_type;
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st->codecpar->codec_tag = 0; /* no fourcc */
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st->codecpar->width = AV_RB32(&scratch[16]);
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st->codecpar->height = AV_RB32(&scratch[12]);
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if (film->video_type == AV_CODEC_ID_RAWVIDEO) {
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if (scratch[20] == 24) {
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st->codecpar->format = AV_PIX_FMT_RGB24;
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} else {
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av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]);
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return -1;
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}
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}
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}
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if (film->audio_type) {
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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film->audio_stream_index = st->index;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = film->audio_type;
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st->codecpar->codec_tag = 1;
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st->codecpar->channels = film->audio_channels;
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st->codecpar->sample_rate = film->audio_samplerate;
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if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) {
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st->codecpar->bits_per_coded_sample = 18 * 8 / 32;
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st->codecpar->block_align = st->codecpar->channels * 18;
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st->need_parsing = AVSTREAM_PARSE_FULL;
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} else {
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st->codecpar->bits_per_coded_sample = film->audio_bits;
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st->codecpar->block_align = st->codecpar->channels *
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st->codecpar->bits_per_coded_sample / 8;
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}
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st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
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st->codecpar->bits_per_coded_sample;
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}
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/* load the sample table */
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if (avio_read(pb, scratch, 16) != 16)
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return AVERROR(EIO);
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if (AV_RB32(&scratch[0]) != STAB_TAG)
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return AVERROR_INVALIDDATA;
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film->base_clock = AV_RB32(&scratch[8]);
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film->sample_count = AV_RB32(&scratch[12]);
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if(film->sample_count >= UINT_MAX / sizeof(film_sample))
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return -1;
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film->sample_table = av_malloc_array(film->sample_count, sizeof(film_sample));
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if (!film->sample_table)
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return AVERROR(ENOMEM);
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for (i = 0; i < s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
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avpriv_set_pts_info(st, 33, 1, film->base_clock);
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else
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avpriv_set_pts_info(st, 64, 1, film->audio_samplerate);
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}
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audio_frame_counter = video_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 (avio_read(pb, scratch, 16) != 16) {
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ret = AVERROR(EIO);
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goto fail;
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}
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film->sample_table[i].sample_offset =
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data_offset + AV_RB32(&scratch[0]);
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film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
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if (film->sample_table[i].sample_size > INT_MAX / 4) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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if (AV_RB32(&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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if (film->audio_type == AV_CODEC_ID_ADPCM_ADX)
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audio_frame_counter += (film->sample_table[i].sample_size * 32 /
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(18 * film->audio_channels));
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else if (film->audio_type != AV_CODEC_ID_NONE)
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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 = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
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film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : AVINDEX_KEYFRAME;
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video_frame_counter++;
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if (film->video_type)
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av_add_index_entry(s->streams[film->video_stream_index],
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film->sample_table[i].sample_offset,
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film->sample_table[i].pts,
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film->sample_table[i].sample_size, 0,
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film->sample_table[i].keyframe);
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}
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}
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if (film->audio_type)
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s->streams[film->audio_stream_index]->duration = audio_frame_counter;
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if (film->video_type)
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s->streams[film->video_stream_index]->duration = video_frame_counter;
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film->current_sample = 0;
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return 0;
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fail:
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film_read_close(s);
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return ret;
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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 = s->priv_data;
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AVIOContext *pb = s->pb;
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film_sample *sample;
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film_sample *next_sample = NULL;
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int next_sample_id;
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int ret = 0;
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if (film->current_sample >= film->sample_count)
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return AVERROR_EOF;
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sample = &film->sample_table[film->current_sample];
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/* Find the next sample from the same stream, assuming there is one;
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* this is used to calculate the duration below */
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next_sample_id = film->current_sample + 1;
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while (next_sample == NULL) {
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if (next_sample_id >= film->sample_count)
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break;
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next_sample = &film->sample_table[next_sample_id];
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if (next_sample->stream != sample->stream) {
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next_sample = NULL;
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next_sample_id++;
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}
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}
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/* position the stream (will probably be there anyway) */
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avio_seek(pb, sample->sample_offset, SEEK_SET);
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ret = av_get_packet(pb, pkt, sample->sample_size);
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if (ret != sample->sample_size)
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ret = AVERROR(EIO);
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pkt->stream_index = sample->stream;
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pkt->dts = sample->pts;
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pkt->pts = sample->pts;
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pkt->flags |= sample->keyframe ? AV_PKT_FLAG_KEY : 0;
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if (next_sample != NULL)
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pkt->duration = next_sample->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_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
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{
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FilmDemuxContext *film = s->priv_data;
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AVStream *st = s->streams[stream_index];
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int64_t pos;
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int ret = av_index_search_timestamp(st, timestamp, flags);
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if (ret < 0)
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return ret;
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pos = avio_seek(s->pb, st->index_entries[ret].pos, SEEK_SET);
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if (pos < 0)
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return pos;
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film->current_sample = ret;
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return 0;
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}
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AVInputFormat ff_segafilm_demuxer = {
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.name = "film_cpk",
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.long_name = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"),
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.priv_data_size = sizeof(FilmDemuxContext),
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.read_probe = film_probe,
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.read_header = film_read_header,
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.read_packet = film_read_packet,
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.read_close = film_read_close,
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.read_seek = film_read_seek,
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};
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