/*

 * 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 "libavutil/mem.h"

#include "avformat.h"

#include "demux.h"

#include "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,

};