/*

 * Wing Commander III Movie (.mve) File 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

 * Wing Commander III Movie file demuxer

 * by Mike Melanson (melanson@pcisys.net)

 * for more information on the WC3 .mve file format, visit:

 *   http://www.pcisys.net/~melanson/codecs/

 */

#include "libavutil/avstring.h"

#include "libavutil/channel_layout.h"

#include "libavutil/intreadwrite.h"

#include "libavutil/dict.h"

#include "libavutil/mem.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

#define FORM_TAG MKTAG('F', 'O', 'R', 'M')

#define MOVE_TAG MKTAG('M', 'O', 'V', 'E')

#define  PC__TAG MKTAG('_', 'P', 'C', '_')

#define SOND_TAG MKTAG('S', 'O', 'N', 'D')

#define BNAM_TAG MKTAG('B', 'N', 'A', 'M')

#define SIZE_TAG MKTAG('S', 'I', 'Z', 'E')

#define PALT_TAG MKTAG('P', 'A', 'L', 'T')

#define INDX_TAG MKTAG('I', 'N', 'D', 'X')

#define BRCH_TAG MKTAG('B', 'R', 'C', 'H')

#define SHOT_TAG MKTAG('S', 'H', 'O', 'T')

#define VGA__TAG MKTAG('V', 'G', 'A', ' ')

#define TEXT_TAG MKTAG('T', 'E', 'X', 'T')

#define AUDI_TAG MKTAG('A', 'U', 'D', 'I')

/* video resolution unless otherwise specified */

#define WC3_DEFAULT_WIDTH 320

#define WC3_DEFAULT_HEIGHT 165

/* always use the same PCM audio parameters */

#define WC3_SAMPLE_RATE 22050

#define WC3_AUDIO_BITS 16

/* nice, constant framerate */

#define WC3_FRAME_FPS 15

#define PALETTE_SIZE (256 * 3)

typedef struct Wc3DemuxContext {

    int width;

    int height;

    int64_t pts;

    int video_stream_index;

    int audio_stream_index;

    AVPacket *vpkt;

} Wc3DemuxContext;

static int wc3_read_close(AVFormatContext *s)

{

    Wc3DemuxContext *wc3 = s->priv_data;

    av_packet_free(&wc3->vpkt);

    return 0;

}

static int wc3_probe(const AVProbeData *p)

{

    if (p->buf_size < 12)

        return 0;

    if ((AV_RL32(&p->buf[0]) != FORM_TAG) ||

        (AV_RL32(&p->buf[8]) != MOVE_TAG))

        return 0;

    return AVPROBE_SCORE_MAX;

}

static int wc3_read_header(AVFormatContext *s)

{

    Wc3DemuxContext *wc3 = s->priv_data;

    AVIOContext *pb = s->pb;

    unsigned int fourcc_tag;

    unsigned int size;

    AVStream *st;

    int ret = 0;

    char *buffer;

    /* default context members */

    wc3->width = WC3_DEFAULT_WIDTH;

    wc3->height = WC3_DEFAULT_HEIGHT;

    wc3->pts = 0;

    wc3->video_stream_index = wc3->audio_stream_index = 0;

    wc3->vpkt = av_packet_alloc();

    if (!wc3->vpkt)

        return AVERROR(ENOMEM);

    /* skip the first 3 32-bit numbers */

    avio_skip(pb, 12);

    /* traverse through the chunks and load the header information before

     * the first BRCH tag */

    fourcc_tag = avio_rl32(pb);

    size = (avio_rb32(pb) + 1) & (~1);

    do {

        switch (fourcc_tag) {

        case SOND_TAG:

        case INDX_TAG:

            /* SOND unknown, INDX unnecessary; ignore both */

            avio_skip(pb, size);

            break;

        case PC__TAG:

            /* number of palettes, unneeded */

            avio_skip(pb, 12);

            break;

        case BNAM_TAG:

            /* load up the name */

            buffer = av_malloc(size+1);

            if (!buffer)

                return AVERROR(ENOMEM);

            if ((ret = avio_read(pb, buffer, size)) != size) {

                av_freep(&buffer);

                return AVERROR(EIO);

            }

            buffer[size] = 0;

            av_dict_set(&s->metadata, "title", buffer,

                                   AV_DICT_DONT_STRDUP_VAL);

            break;

        case SIZE_TAG:

            /* video resolution override */

            wc3->width  = avio_rl32(pb);

            wc3->height = avio_rl32(pb);

            break;

        case PALT_TAG:

            /* one of several palettes */

            avio_seek(pb, -8, SEEK_CUR);

            av_append_packet(pb, wc3->vpkt, 8 + PALETTE_SIZE);

            break;

        default:

            av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",

                   av_fourcc2str(fourcc_tag));

            return AVERROR_INVALIDDATA;

        }

        fourcc_tag = avio_rl32(pb);

        /* chunk sizes are 16-bit aligned */

        size = (avio_rb32(pb) + 1) & (~1);

        if (avio_feof(pb))

            return AVERROR(EIO);

    } while (fourcc_tag != BRCH_TAG);

    /* initialize the decoder streams */

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);

    wc3->video_stream_index = st->index;

    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;

    st->codecpar->codec_id = AV_CODEC_ID_XAN_WC3;

    st->codecpar->codec_tag = 0;  /* no fourcc */

    st->codecpar->width = wc3->width;

    st->codecpar->height = wc3->height;

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);

    wc3->audio_stream_index = st->index;

    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

    st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;

    st->codecpar->codec_tag = 1;

    st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

    st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS;

    st->codecpar->sample_rate = WC3_SAMPLE_RATE;

    st->codecpar->bit_rate = st->codecpar->ch_layout.nb_channels * st->codecpar->sample_rate *

        st->codecpar->bits_per_coded_sample;

    st->codecpar->block_align = WC3_AUDIO_BITS * st->codecpar->ch_layout.nb_channels;

    return 0;

}

static int wc3_read_packet(AVFormatContext *s,

                           AVPacket *pkt)

{

    Wc3DemuxContext *wc3 = s->priv_data;

    AVIOContext *pb = s->pb;

    unsigned int fourcc_tag;

    unsigned int size;

    int packet_read = 0;

    int ret = 0;

    unsigned char text[1024];

    while (!packet_read) {

        fourcc_tag = avio_rl32(pb);

        /* chunk sizes are 16-bit aligned */

        size = (avio_rb32(pb) + 1) & (~1);

        if (avio_feof(pb))

            return AVERROR(EIO);

        switch (fourcc_tag) {

        case BRCH_TAG:

            /* no-op */

            break;

        case SHOT_TAG:

            /* load up new palette */

            avio_seek(pb, -8, SEEK_CUR);

            av_append_packet(pb, wc3->vpkt, 8 + 4);

            break;

        case VGA__TAG:

            /* send out video chunk */

            avio_seek(pb, -8, SEEK_CUR);

            ret= av_append_packet(pb, wc3->vpkt, 8 + size);

            // ignore error if we have some data

            if (wc3->vpkt->size > 0)

                ret = 0;

            av_packet_move_ref(pkt, wc3->vpkt);

            pkt->stream_index = wc3->video_stream_index;

            pkt->pts = wc3->pts;

            packet_read = 1;

            break;

        case TEXT_TAG:

            /* subtitle chunk */

            if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)

                ret = AVERROR(EIO);

            else {

                int i = 0;

                av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");

                if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)

                    return AVERROR_INVALIDDATA;

                av_log (s, AV_LOG_DEBUG, "  inglish: %s\n", &text[i + 1]);

                i += text[i] + 1;

                if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)

                    return AVERROR_INVALIDDATA;

                av_log (s, AV_LOG_DEBUG, "  doytsch: %s\n", &text[i + 1]);

                i += text[i] + 1;

                if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)

                    return AVERROR_INVALIDDATA;

                av_log (s, AV_LOG_DEBUG, "  fronsay: %s\n", &text[i + 1]);

            }

            break;

        case AUDI_TAG:

            /* send out audio chunk */

            ret= av_get_packet(pb, pkt, size);

            pkt->stream_index = wc3->audio_stream_index;

            pkt->pts = wc3->pts;

            /* time to advance pts */

            wc3->pts++;

            packet_read = 1;

            break;

        default:

            av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",

                   av_fourcc2str(fourcc_tag));

            ret = AVERROR_INVALIDDATA;

            packet_read = 1;

            break;

        }

    }

    return ret;

}

const FFInputFormat ff_wc3_demuxer = {

    .p.name         = "wc3movie",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Wing Commander III movie"),

    .priv_data_size = sizeof(Wc3DemuxContext),

    .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,

    .read_probe     = wc3_probe,

    .read_header    = wc3_read_header,

    .read_packet    = wc3_read_packet,

    .read_close     = wc3_read_close,

};