PeerStreamer

/*

 * Delphine Software International CIN Audio/Video Decoders

 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)

 *

 * 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 dsicinav.c

 * Delphine Software International CIN audio/video decoders

 */

#include "avcodec.h"

#include "common.h"

typedef enum CinVideoBitmapIndex {

    CIN_CUR_BMP = 0, /* current */

    CIN_PRE_BMP = 1, /* previous */

    CIN_INT_BMP = 2  /* intermediate */

} CinVideoBitmapIndex;

typedef struct CinVideoContext {

    AVCodecContext *avctx;

    AVFrame frame;

    unsigned int bitmap_size;

    uint32_t palette[256];

    uint8_t *bitmap_table[3];

} CinVideoContext;

typedef struct CinAudioContext {

    AVCodecContext *avctx;

    int initial_decode_frame;

    int delta;

} CinAudioContext;

/* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */

static const int16_t cinaudio_delta16_table[256] = {

         0,      0,      0,      0,      0,      0,      0,      0,

         0,      0,      0,      0,      0,      0,      0,      0,

         0,      0,      0, -30210, -27853, -25680, -23677, -21829,

    -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,

    -10508,  -9689,  -8933,  -8236,  -7593,  -7001,  -6455,  -5951,

     -5487,  -5059,  -4664,  -4300,  -3964,  -3655,  -3370,  -3107,

     -2865,  -2641,  -2435,  -2245,  -2070,  -1908,  -1759,  -1622,

     -1495,  -1379,  -1271,  -1172,  -1080,   -996,   -918,   -847,

      -781,   -720,   -663,   -612,   -564,   -520,   -479,   -442,

      -407,   -376,   -346,   -319,   -294,   -271,   -250,   -230,

      -212,   -196,   -181,   -166,   -153,   -141,   -130,   -120,

      -111,   -102,    -94,    -87,    -80,    -74,    -68,    -62,

       -58,    -53,    -49,    -45,    -41,    -38,    -35,    -32,

       -30,    -27,    -25,    -23,    -21,    -20,    -18,    -17,

       -15,    -14,    -13,    -12,    -11,    -10,     -9,     -8,

        -7,     -6,     -5,     -4,     -3,     -2,     -1,      0,

         0,      1,      2,      3,      4,      5,      6,      7,

         8,      9,     10,     11,     12,     13,     14,     15,

        17,     18,     20,     21,     23,     25,     27,     30,

        32,     35,     38,     41,     45,     49,     53,     58,

        62,     68,     74,     80,     87,     94,    102,    111,

       120,    130,    141,    153,    166,    181,    196,    212,

       230,    250,    271,    294,    319,    346,    376,    407,

       442,    479,    520,    564,    612,    663,    720,    781,

       847,    918,    996,   1080,   1172,   1271,   1379,   1495,

      1622,   1759,   1908,   2070,   2245,   2435,   2641,   2865,

      3107,   3370,   3655,   3964,   4300,   4664,   5059,   5487,

      5951,   6455,   7001,   7593,   8236,   8933,   9689,  10508,

     11398,  12362,  13408,  14543,  15774,  17108,  18556,  20126,

     21829,  23677,  25680,  27853,  30210,      0,      0,      0,

         0,      0,      0,      0,      0,      0,      0,      0,

         0,      0,      0,      0,      0,      0,      0,      0

};

static int cinvideo_decode_init(AVCodecContext *avctx)

{

    CinVideoContext *cin = avctx->priv_data;

    unsigned int i;

    cin->avctx = avctx;

    avctx->pix_fmt = PIX_FMT_PAL8;

    cin->frame.data[0] = NULL;

    cin->bitmap_size = avctx->width * avctx->height;

    for (i = 0; i < 3; ++i) {

        cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);

        if (!cin->bitmap_table[i])

            av_log(avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");

    }

    return 0;

}

static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, int size)

{

    while (size--)

        *dst++ += *src++;

}

static int cin_decode_huffman(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)

{

    int b, huff_code = 0;

    unsigned char huff_code_table[15];

    unsigned char *dst_cur = dst;

    unsigned char *dst_end = dst + dst_size;

    const unsigned char *src_end = src + src_size;

    memcpy(huff_code_table, src, 15); src += 15; src_size -= 15;

    while (src < src_end) {

        huff_code = *src++;

        if ((huff_code >> 4) == 15) {

            b = huff_code << 4;

            huff_code = *src++;

            *dst_cur++ = b | (huff_code >> 4);

        } else

            *dst_cur++ = huff_code_table[huff_code >> 4];

        if (dst_cur >= dst_end)

            break;

        huff_code &= 15;

        if (huff_code == 15) {

            *dst_cur++ = *src++;

        } else

            *dst_cur++ = huff_code_table[huff_code];

        if (dst_cur >= dst_end)

            break;

    }

    return dst_cur - dst;

}

static void cin_decode_lzss(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)

{

    uint16_t cmd;

    int i, sz, offset, code;

    unsigned char *dst_end = dst + dst_size;

    const unsigned char *src_end = src + src_size;

    while (src < src_end && dst < dst_end) {

        code = *src++;

        for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {

            if (code & (1 << i)) {

                *dst++ = *src++;

            } else {

                cmd = AV_RL16(src); src += 2;

                offset = cmd >> 4;

                sz = (cmd & 0xF) + 2;

                /* don't use memcpy/memmove here as the decoding routine (ab)uses */

                /* buffer overlappings to repeat bytes in the destination */

                sz = FFMIN(sz, dst_end - dst);

                while (sz--) {

                    *dst = *(dst - offset - 1);

                    ++dst;

                }

            }

        }

    }

}

static void cin_decode_rle(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)

{

    int len, code;

    unsigned char *dst_end = dst + dst_size;

    const unsigned char *src_end = src + src_size;

    while (src < src_end && dst < dst_end) {

        code = *src++;

        if (code & 0x80) {

            len = code - 0x7F;

            memset(dst, *src++, FFMIN(len, dst_end - dst));

        } else {

            len = code + 1;

            memcpy(dst, src, FFMIN(len, dst_end - dst));

            src += len;

        }

        dst += len;

    }

}

static int cinvideo_decode_frame(AVCodecContext *avctx,

                                 void *data, int *data_size,

                                 uint8_t *buf, int buf_size)

{

    CinVideoContext *cin = avctx->priv_data;

    int i, y, palette_type, palette_colors_count, bitmap_frame_type, bitmap_frame_size;

    cin->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;

    if (avctx->reget_buffer(avctx, &cin->frame)) {

        av_log(cin->avctx, AV_LOG_ERROR, "delphinecinvideo: reget_buffer() failed to allocate a frame\n");

        return -1;

    }

    palette_type = buf[0];

    palette_colors_count = buf[1] | (buf[2] << 8);

    bitmap_frame_type = buf[3];

    buf += 4;

    bitmap_frame_size = buf_size - 4;

    /* handle palette */

    if (palette_type == 0) {

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

            cin->palette[i] = (buf[2] << 16) | (buf[1] << 8) | buf[0];

            buf += 3;

            bitmap_frame_size -= 3;

        }

    } else {

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

            cin->palette[buf[0]] = (buf[3] << 16) | (buf[2] << 8) | buf[1];

            buf += 4;

            bitmap_frame_size -= 4;

        }

    }

    memcpy(cin->frame.data[1], cin->palette, sizeof(cin->palette));

    cin->frame.palette_has_changed = 1;

    /* note: the decoding routines below assumes that surface.width = surface.pitch */

    switch (bitmap_frame_type) {

    case 9:

        cin_decode_rle(buf, bitmap_frame_size,

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        break;

    case 34:

        cin_decode_rle(buf, bitmap_frame_size,

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        break;

    case 35:

        cin_decode_huffman(buf, bitmap_frame_size,

          cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);

        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        break;

    case 36:

        bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,

          cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);

        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        break;

    case 37:

        cin_decode_huffman(buf, bitmap_frame_size,

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        break;

    case 38:

        cin_decode_lzss(buf, bitmap_frame_size,

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        break;

    case 39:

        cin_decode_lzss(buf, bitmap_frame_size,

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],

          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);

        break;

    }

    for (y = 0; y < cin->avctx->height; ++y)

        memcpy(cin->frame.data[0] + (cin->avctx->height - 1 - y) * cin->frame.linesize[0],

          cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,

          cin->avctx->width);

    FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_table[CIN_PRE_BMP]);

    *data_size = sizeof(AVFrame);

    *(AVFrame *)data = cin->frame;

    return buf_size;

}

static int cinvideo_decode_end(AVCodecContext *avctx)

{

    CinVideoContext *cin = avctx->priv_data;

    int i;

    if (cin->frame.data[0])

        avctx->release_buffer(avctx, &cin->frame);

    for (i = 0; i < 3; ++i)

        av_free(cin->bitmap_table[i]);

    return 0;

}

static int cinaudio_decode_init(AVCodecContext *avctx)

{

    CinAudioContext *cin = avctx->priv_data;

    cin->avctx = avctx;

    cin->initial_decode_frame = 1;

    cin->delta = 0;

    return 0;

}

static int cinaudio_decode_frame(AVCodecContext *avctx,

                                 void *data, int *data_size,

                                 uint8_t *buf, int buf_size)

{

    CinAudioContext *cin = avctx->priv_data;

    uint8_t *src = buf;

    int16_t *samples = (int16_t *)data;

    if (cin->initial_decode_frame) {

        cin->initial_decode_frame = 0;

        cin->delta = (int16_t)AV_RL16(src); src += 2;

        *samples++ = cin->delta;

        buf_size -= 2;

    }

    while (buf_size > 0) {

        cin->delta += cinaudio_delta16_table[*src++];

        cin->delta = av_clip(cin->delta, -32768, 32767);

        *samples++ = cin->delta;

        --buf_size;

    }

    *data_size = (uint8_t *)samples - (uint8_t *)data;

    return src - buf;

}

AVCodec dsicinvideo_decoder = {

    "dsicinvideo",

    CODEC_TYPE_VIDEO,

    CODEC_ID_DSICINVIDEO,

    sizeof(CinVideoContext),

    cinvideo_decode_init,

    NULL,

    cinvideo_decode_end,

    cinvideo_decode_frame,

    CODEC_CAP_DR1,

};

AVCodec dsicinaudio_decoder = {

    "dsicinaudio",

    CODEC_TYPE_AUDIO,

    CODEC_ID_DSICINAUDIO,

    sizeof(CinAudioContext),

    cinaudio_decode_init,

    NULL,

    NULL,

    cinaudio_decode_frame,

};