segafilm.c 9.15 KB
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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.
 *
 * 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
 * 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
 * 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
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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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 * @file
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 * 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/
 */

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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')
#define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
#define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
#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 {
  int stream;
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  int64_t sample_offset;
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  unsigned int sample_size;
  int64_t pts;
  int keyframe;
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} film_sample;
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typedef struct FilmDemuxContext {
    int video_stream_index;
    int audio_stream_index;

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    enum AVCodecID audio_type;
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    unsigned int audio_samplerate;
    unsigned int audio_bits;
    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;

    unsigned int base_clock;
    unsigned int version;
} FilmDemuxContext;

static int film_probe(AVProbeData *p)
{
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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)
        return 0;

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    return AVPROBE_SCORE_MAX;
}

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static int film_read_close(AVFormatContext *s)
{
    FilmDemuxContext *film = s->priv_data;

    av_freep(&film->sample_table);

    return 0;
}

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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;
    unsigned char scratch[256];
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    int i, ret;
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    unsigned int data_offset;
    unsigned int audio_frame_counter;

    film->sample_table = NULL;

    /* 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]);
    film->version = AV_RB32(&scratch[8]);
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    /* load the FDSC chunk */
    if (film->version == 0) {
        /* 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;
        film->audio_channels = 1;
        film->audio_bits = 8;
    } else {
        /* 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];
        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) {
            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 */
    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->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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        st->codec->codec_id = film->video_type;
        st->codec->codec_tag = 0;  /* no fourcc */
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        st->codec->width = AV_RB32(&scratch[16]);
        st->codec->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->codec->pix_fmt = AV_PIX_FMT_RGB24;
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            } else {
                av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]);
                return -1;
            }
        }
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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->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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        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;
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        if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) {
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            st->codec->bits_per_coded_sample = 18 * 8 / 32;
            st->codec->block_align = st->codec->channels * 18;
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            st->need_parsing = AVSTREAM_PARSE_FULL;
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        } else {
            st->codec->bits_per_coded_sample = film->audio_bits;
            st->codec->block_align = st->codec->channels *
                st->codec->bits_per_coded_sample / 8;
        }

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        st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
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            st->codec->bits_per_coded_sample;
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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]);
    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(film->sample_count * sizeof(film_sample));
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    if (!film->sample_table)
        return AVERROR(ENOMEM);
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    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);
    }
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    audio_frame_counter = 0;
    for (i = 0; i < film->sample_count; i++) {
        /* 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);
            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]);
        film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
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        if (film->sample_table[i].sample_size > INT_MAX / 4) {
            ret = AVERROR_INVALIDDATA;
            goto fail;
        }
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        if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
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            film->sample_table[i].stream = film->audio_stream_index;
            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 /
                    (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 /
                    (film->audio_channels * film->audio_bits / 8));
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        } else {
            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 : 1;
        }
    }

    film->current_sample = 0;

    return 0;
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fail:
    film_read_close(s);
    return ret;
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}

static int film_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
{
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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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    int ret = 0;

    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];

    /* 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);
    if (ret != sample->sample_size)
        ret = AVERROR(EIO);
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    pkt->stream_index = sample->stream;
    pkt->pts = sample->pts;

    film->current_sample++;

    return ret;
}

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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),
    .read_probe     = film_probe,
    .read_header    = film_read_header,
    .read_packet    = film_read_packet,
    .read_close     = film_read_close,
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};