PeerStreamer

/*

 * 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 libavformat/wc3movie.c

 * 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/intreadwrite.h"

#include "avformat.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_CHANNELS 1

#define WC3_AUDIO_BITS 16

/* nice, constant framerate */

#define WC3_FRAME_FPS 15

#define PALETTE_SIZE (256 * 3)

#define PALETTE_COUNT 256

typedef struct Wc3DemuxContext {

    int width;

    int height;

    unsigned char *palettes;

    int palette_count;

    int64_t pts;

    int video_stream_index;

    int audio_stream_index;

    AVPaletteControl palette_control;

} Wc3DemuxContext;

/**

 * palette lookup table that does gamma correction

 *

 * can be calculated by this formula:

 * for i between 0 and 251 inclusive:

 * wc3_pal_lookup[i] = round(pow(i / 256.0, 0.8) * 256);

 * values 252, 253, 254 and 255 are all 0xFD

 * calculating this at runtime should not cause any

 * rounding issues, the maximum difference between

 * the table values and the calculated doubles is

 * about 0.497527

 */

static const unsigned char wc3_pal_lookup[] = {

  0x00, 0x03, 0x05, 0x07, 0x09, 0x0B, 0x0D, 0x0E,

  0x10, 0x12, 0x13, 0x15, 0x16, 0x18, 0x19, 0x1A,

  0x1C, 0x1D, 0x1F, 0x20, 0x21, 0x23, 0x24, 0x25,

  0x27, 0x28, 0x29, 0x2A, 0x2C, 0x2D, 0x2E, 0x2F,

  0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x38, 0x39,

  0x3A, 0x3B, 0x3C, 0x3D, 0x3F, 0x40, 0x41, 0x42,

  0x43, 0x44, 0x45, 0x46, 0x48, 0x49, 0x4A, 0x4B,

  0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53,

  0x54, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C,

  0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64,

  0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C,

  0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73, 0x74,

  0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C,

  0x7D, 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83,

  0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B,

  0x8C, 0x8D, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92,

  0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x99,

  0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 0xA0, 0xA1,

  0xA2, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,

  0xA9, 0xAA, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,

  0xB0, 0xB1, 0xB2, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,

  0xB7, 0xB8, 0xB9, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD,

  0xBE, 0xBF, 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4,

  0xC5, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB,

  0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD0, 0xD1,

  0xD2, 0xD3, 0xD4, 0xD5, 0xD5, 0xD6, 0xD7, 0xD8,

  0xD9, 0xDA, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,

  0xDF, 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE4, 0xE5,

  0xE6, 0xE7, 0xE8, 0xE9, 0xE9, 0xEA, 0xEB, 0xEC,

  0xED, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF1, 0xF2,

  0xF3, 0xF4, 0xF5, 0xF6, 0xF6, 0xF7, 0xF8, 0xF9,

  0xFA, 0xFA, 0xFB, 0xFC, 0xFD, 0xFD, 0xFD, 0xFD

};

static int wc3_probe(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,

                           AVFormatParameters *ap)

{

    Wc3DemuxContext *wc3 = s->priv_data;

    ByteIOContext *pb = s->pb;

    unsigned int fourcc_tag;

    unsigned int size;

    AVStream *st;

    int ret = 0;

    int current_palette = 0;

    char *buffer;

    int i;

    unsigned char rotate;

    /* default context members */

    wc3->width = WC3_DEFAULT_WIDTH;

    wc3->height = WC3_DEFAULT_HEIGHT;

    wc3->palettes = NULL;

    wc3->palette_count = 0;

    wc3->pts = 0;

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

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

    url_fseek(pb, 12, SEEK_CUR);

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

     * the first BRCH tag */

    fourcc_tag = get_le32(pb);

    size = (get_be32(pb) + 1) & (~1);

    do {

        switch (fourcc_tag) {

        case SOND_TAG:

        case INDX_TAG:

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

            url_fseek(pb, size, SEEK_CUR);

            break;

        case PC__TAG:

            /* need the number of palettes */

            url_fseek(pb, 8, SEEK_CUR);

            wc3->palette_count = get_le32(pb);

            if((unsigned)wc3->palette_count >= UINT_MAX / PALETTE_SIZE){

                wc3->palette_count= 0;

                return -1;

            }

            wc3->palettes = av_malloc(wc3->palette_count * PALETTE_SIZE);

            break;

        case BNAM_TAG:

            /* load up the name */

            buffer = av_malloc(size+1);

            if (!buffer)

                return AVERROR(ENOMEM);

            if ((ret = get_buffer(pb, buffer, size)) != size)

                return AVERROR(EIO);

            buffer[size] = 0;

            av_metadata_set2(&s->metadata, "title", buffer,

                                   AV_METADATA_DONT_STRDUP_VAL);

            break;

        case SIZE_TAG:

            /* video resolution override */

            wc3->width  = get_le32(pb);

            wc3->height = get_le32(pb);

            break;

        case PALT_TAG:

            /* one of several palettes */

            if ((unsigned)current_palette >= wc3->palette_count)

                return AVERROR_INVALIDDATA;

            if ((ret = get_buffer(pb,

                &wc3->palettes[current_palette * PALETTE_SIZE],

                PALETTE_SIZE)) != PALETTE_SIZE)

                return AVERROR(EIO);

            /* transform the current palette in place */

            for (i = current_palette * PALETTE_SIZE;

                 i < (current_palette + 1) * PALETTE_SIZE; i++) {

                /* rotate each palette component left by 2 and use the result

                 * as an index into the color component table */

                rotate = ((wc3->palettes[i] << 2) & 0xFF) |

                         ((wc3->palettes[i] >> 6) & 0xFF);

                wc3->palettes[i] = wc3_pal_lookup[rotate];

            }

            current_palette++;

            break;

        default:

            av_log(s, AV_LOG_ERROR, "  unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n",

                (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24),

                (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24));

            return AVERROR_INVALIDDATA;

            break;

        }

        fourcc_tag = get_le32(pb);

        /* chunk sizes are 16-bit aligned */

        size = (get_be32(pb) + 1) & (~1);

        if (url_feof(pb))

            return AVERROR(EIO);

    } while (fourcc_tag != BRCH_TAG);

    /* initialize the decoder streams */

    st = av_new_stream(s, 0);

    if (!st)

        return AVERROR(ENOMEM);

    av_set_pts_info(st, 33, 1, WC3_FRAME_FPS);

    wc3->video_stream_index = st->index;

    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

    st->codec->codec_id = CODEC_ID_XAN_WC3;

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

    st->codec->width = wc3->width;

    st->codec->height = wc3->height;

    /* palette considerations */

    st->codec->palctrl = &wc3->palette_control;

    st = av_new_stream(s, 0);

    if (!st)

        return AVERROR(ENOMEM);

    av_set_pts_info(st, 33, 1, WC3_FRAME_FPS);

    wc3->audio_stream_index = st->index;

    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

    st->codec->codec_id = CODEC_ID_PCM_S16LE;

    st->codec->codec_tag = 1;

    st->codec->channels = WC3_AUDIO_CHANNELS;

    st->codec->bits_per_coded_sample = WC3_AUDIO_BITS;

    st->codec->sample_rate = WC3_SAMPLE_RATE;

    st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *

        st->codec->bits_per_coded_sample;

    st->codec->block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS;

    return 0;

}

static int wc3_read_packet(AVFormatContext *s,

                           AVPacket *pkt)

{

    Wc3DemuxContext *wc3 = s->priv_data;

    ByteIOContext *pb = s->pb;

    unsigned int fourcc_tag;

    unsigned int size;

    int packet_read = 0;

    int ret = 0;

    unsigned char text[1024];

    unsigned int palette_number;

    int i;

    unsigned char r, g, b;

    int base_palette_index;

    while (!packet_read) {

        fourcc_tag = get_le32(pb);

        /* chunk sizes are 16-bit aligned */

        size = (get_be32(pb) + 1) & (~1);

        if (url_feof(pb))

            return AVERROR(EIO);

        switch (fourcc_tag) {

        case BRCH_TAG:

            /* no-op */

            break;

        case SHOT_TAG:

            /* load up new palette */

            palette_number = get_le32(pb);

            if (palette_number >= wc3->palette_count)

                return AVERROR_INVALIDDATA;

            base_palette_index = palette_number * PALETTE_COUNT * 3;

            for (i = 0; i < PALETTE_COUNT; i++) {

                r = wc3->palettes[base_palette_index + i * 3 + 0];

                g = wc3->palettes[base_palette_index + i * 3 + 1];

                b = wc3->palettes[base_palette_index + i * 3 + 2];

                wc3->palette_control.palette[i] = (r << 16) | (g << 8) | (b);

            }

            wc3->palette_control.palette_changed = 1;

            break;

        case VGA__TAG:

            /* send out video chunk */

            ret= av_get_packet(pb, pkt, size);

            pkt->stream_index = wc3->video_stream_index;

            pkt->pts = wc3->pts;

            packet_read = 1;

            break;

        case TEXT_TAG:

            /* subtitle chunk */

#if 0

            url_fseek(pb, size, SEEK_CUR);

#else

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

                ret = AVERROR(EIO);

            else {

                int i = 0;

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

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

                i += text[i] + 1;

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

                i += text[i] + 1;

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

            }

#endif

            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: %c%c%c%c (0x%02X%02X%02X%02X)\n",

                (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24),

                (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24));

            ret = AVERROR_INVALIDDATA;

            packet_read = 1;

            break;

        }

    }

    return ret;

}

static int wc3_read_close(AVFormatContext *s)

{

    Wc3DemuxContext *wc3 = s->priv_data;

    av_free(wc3->palettes);

    return 0;

}

AVInputFormat wc3_demuxer = {

    "wc3movie",

    NULL_IF_CONFIG_SMALL("Wing Commander III movie format"),

    sizeof(Wc3DemuxContext),

    wc3_probe,

    wc3_read_header,

    wc3_read_packet,

    wc3_read_close,

};