yading@10: /*
yading@10:  * Delphine Software International CIN Audio/Video Decoders
yading@10:  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Delphine Software International CIN audio/video decoders
yading@10:  */
yading@10: 
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: #include "mathops.h"
yading@10: 
yading@10: 
yading@10: typedef enum CinVideoBitmapIndex {
yading@10:     CIN_CUR_BMP = 0, /* current */
yading@10:     CIN_PRE_BMP = 1, /* previous */
yading@10:     CIN_INT_BMP = 2  /* intermediate */
yading@10: } CinVideoBitmapIndex;
yading@10: 
yading@10: typedef struct CinVideoContext {
yading@10:     AVCodecContext *avctx;
yading@10:     AVFrame frame;
yading@10:     unsigned int bitmap_size;
yading@10:     uint32_t palette[256];
yading@10:     uint8_t *bitmap_table[3];
yading@10: } CinVideoContext;
yading@10: 
yading@10: typedef struct CinAudioContext {
yading@10:     int initial_decode_frame;
yading@10:     int delta;
yading@10: } CinAudioContext;
yading@10: 
yading@10: 
yading@10: /* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */
yading@10: static const int16_t cinaudio_delta16_table[256] = {
yading@10:          0,      0,      0,      0,      0,      0,      0,      0,
yading@10:          0,      0,      0,      0,      0,      0,      0,      0,
yading@10:          0,      0,      0, -30210, -27853, -25680, -23677, -21829,
yading@10:     -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,
yading@10:     -10508,  -9689,  -8933,  -8236,  -7593,  -7001,  -6455,  -5951,
yading@10:      -5487,  -5059,  -4664,  -4300,  -3964,  -3655,  -3370,  -3107,
yading@10:      -2865,  -2641,  -2435,  -2245,  -2070,  -1908,  -1759,  -1622,
yading@10:      -1495,  -1379,  -1271,  -1172,  -1080,   -996,   -918,   -847,
yading@10:       -781,   -720,   -663,   -612,   -564,   -520,   -479,   -442,
yading@10:       -407,   -376,   -346,   -319,   -294,   -271,   -250,   -230,
yading@10:       -212,   -196,   -181,   -166,   -153,   -141,   -130,   -120,
yading@10:       -111,   -102,    -94,    -87,    -80,    -74,    -68,    -62,
yading@10:        -58,    -53,    -49,    -45,    -41,    -38,    -35,    -32,
yading@10:        -30,    -27,    -25,    -23,    -21,    -20,    -18,    -17,
yading@10:        -15,    -14,    -13,    -12,    -11,    -10,     -9,     -8,
yading@10:         -7,     -6,     -5,     -4,     -3,     -2,     -1,      0,
yading@10:          0,      1,      2,      3,      4,      5,      6,      7,
yading@10:          8,      9,     10,     11,     12,     13,     14,     15,
yading@10:         17,     18,     20,     21,     23,     25,     27,     30,
yading@10:         32,     35,     38,     41,     45,     49,     53,     58,
yading@10:         62,     68,     74,     80,     87,     94,    102,    111,
yading@10:        120,    130,    141,    153,    166,    181,    196,    212,
yading@10:        230,    250,    271,    294,    319,    346,    376,    407,
yading@10:        442,    479,    520,    564,    612,    663,    720,    781,
yading@10:        847,    918,    996,   1080,   1172,   1271,   1379,   1495,
yading@10:       1622,   1759,   1908,   2070,   2245,   2435,   2641,   2865,
yading@10:       3107,   3370,   3655,   3964,   4300,   4664,   5059,   5487,
yading@10:       5951,   6455,   7001,   7593,   8236,   8933,   9689,  10508,
yading@10:      11398,  12362,  13408,  14543,  15774,  17108,  18556,  20126,
yading@10:      21829,  23677,  25680,  27853,  30210,      0,      0,      0,
yading@10:          0,      0,      0,      0,      0,      0,      0,      0,
yading@10:          0,      0,      0,      0,      0,      0,      0,      0
yading@10: };
yading@10: 
yading@10: static av_cold void destroy_buffers(CinVideoContext *cin)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < 3; ++i)
yading@10:         av_freep(&cin->bitmap_table[i]);
yading@10: }
yading@10: 
yading@10: static av_cold int allocate_buffers(CinVideoContext *cin)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < 3; ++i) {
yading@10:         cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
yading@10:         if (!cin->bitmap_table[i]) {
yading@10:             av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
yading@10:             destroy_buffers(cin);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     CinVideoContext *cin = avctx->priv_data;
yading@10: 
yading@10:     cin->avctx = avctx;
yading@10:     avctx->pix_fmt = AV_PIX_FMT_PAL8;
yading@10: 
yading@10:     avcodec_get_frame_defaults(&cin->frame);
yading@10: 
yading@10:     cin->bitmap_size = avctx->width * avctx->height;
yading@10:     if (allocate_buffers(cin))
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, int size)
yading@10: {
yading@10:     while (size--)
yading@10:         *dst++ += *src++;
yading@10: }
yading@10: 
yading@10: static int cin_decode_huffman(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
yading@10: {
yading@10:     int b, huff_code = 0;
yading@10:     unsigned char huff_code_table[15];
yading@10:     unsigned char *dst_cur = dst;
yading@10:     unsigned char *dst_end = dst + dst_size;
yading@10:     const unsigned char *src_end = src + src_size;
yading@10: 
yading@10:     memcpy(huff_code_table, src, 15); src += 15;
yading@10: 
yading@10:     while (src < src_end) {
yading@10:         huff_code = *src++;
yading@10:         if ((huff_code >> 4) == 15) {
yading@10:             b = huff_code << 4;
yading@10:             huff_code = *src++;
yading@10:             *dst_cur++ = b | (huff_code >> 4);
yading@10:         } else
yading@10:             *dst_cur++ = huff_code_table[huff_code >> 4];
yading@10:         if (dst_cur >= dst_end)
yading@10:             break;
yading@10: 
yading@10:         huff_code &= 15;
yading@10:         if (huff_code == 15) {
yading@10:             *dst_cur++ = *src++;
yading@10:         } else
yading@10:             *dst_cur++ = huff_code_table[huff_code];
yading@10:         if (dst_cur >= dst_end)
yading@10:             break;
yading@10:     }
yading@10: 
yading@10:     return dst_cur - dst;
yading@10: }
yading@10: 
yading@10: static int cin_decode_lzss(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
yading@10: {
yading@10:     uint16_t cmd;
yading@10:     int i, sz, offset, code;
yading@10:     unsigned char *dst_end = dst + dst_size, *dst_start = dst;
yading@10:     const unsigned char *src_end = src + src_size;
yading@10: 
yading@10:     while (src < src_end && dst < dst_end) {
yading@10:         code = *src++;
yading@10:         for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
yading@10:             if (code & (1 << i)) {
yading@10:                 *dst++ = *src++;
yading@10:             } else {
yading@10:                 cmd = AV_RL16(src); src += 2;
yading@10:                 offset = cmd >> 4;
yading@10:                 if ((int) (dst - dst_start) < offset + 1)
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 sz = (cmd & 0xF) + 2;
yading@10:                 /* don't use memcpy/memmove here as the decoding routine (ab)uses */
yading@10:                 /* buffer overlappings to repeat bytes in the destination */
yading@10:                 sz = FFMIN(sz, dst_end - dst);
yading@10:                 while (sz--) {
yading@10:                     *dst = *(dst - offset - 1);
yading@10:                     ++dst;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int cin_decode_rle(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
yading@10: {
yading@10:     int len, code;
yading@10:     unsigned char *dst_end = dst + dst_size;
yading@10:     const unsigned char *src_end = src + src_size;
yading@10: 
yading@10:     while (src + 1 < src_end && dst < dst_end) {
yading@10:         code = *src++;
yading@10:         if (code & 0x80) {
yading@10:             len = code - 0x7F;
yading@10:             memset(dst, *src++, FFMIN(len, dst_end - dst));
yading@10:         } else {
yading@10:             len = code + 1;
yading@10:             if (len > src_end-src) {
yading@10:                 av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:             memcpy(dst, src, FFMIN(len, dst_end - dst));
yading@10:             src += len;
yading@10:         }
yading@10:         dst += len;
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int cinvideo_decode_frame(AVCodecContext *avctx,
yading@10:                                  void *data, int *got_frame,
yading@10:                                  AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     CinVideoContext *cin = avctx->priv_data;
yading@10:     int i, y, palette_type, palette_colors_count, bitmap_frame_type, bitmap_frame_size, res = 0;
yading@10: 
yading@10:     palette_type = buf[0];
yading@10:     palette_colors_count = AV_RL16(buf+1);
yading@10:     bitmap_frame_type = buf[3];
yading@10:     buf += 4;
yading@10: 
yading@10:     bitmap_frame_size = buf_size - 4;
yading@10: 
yading@10:     /* handle palette */
yading@10:     if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     if (palette_type == 0) {
yading@10:         if (palette_colors_count > 256)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         for (i = 0; i < palette_colors_count; ++i) {
yading@10:             cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf);
yading@10:             bitmap_frame_size -= 3;
yading@10:         }
yading@10:     } else {
yading@10:         for (i = 0; i < palette_colors_count; ++i) {
yading@10:             cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf+1);
yading@10:             buf += 4;
yading@10:             bitmap_frame_size -= 4;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* note: the decoding routines below assumes that surface.width = surface.pitch */
yading@10:     switch (bitmap_frame_type) {
yading@10:     case 9:
yading@10:         cin_decode_rle(buf, bitmap_frame_size,
yading@10:           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
yading@10:         break;
yading@10:     case 34:
yading@10:         cin_decode_rle(buf, bitmap_frame_size,
yading@10:           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
yading@10:         cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
yading@10:           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
yading@10:         break;
yading@10:     case 35:
yading@10:         bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
yading@10:           cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
yading@10:         cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
yading@10:           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
yading@10:         break;
yading@10:     case 36:
yading@10:         bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
yading@10:           cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
yading@10:         cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
yading@10:           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
yading@10:         cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
yading@10:           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
yading@10:         break;
yading@10:     case 37:
yading@10:         cin_decode_huffman(buf, bitmap_frame_size,
yading@10:           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
yading@10:         break;
yading@10:     case 38:
yading@10:         res = cin_decode_lzss(buf, bitmap_frame_size,
yading@10:                               cin->bitmap_table[CIN_CUR_BMP],
yading@10:                               cin->bitmap_size);
yading@10:         if (res < 0)
yading@10:             return res;
yading@10:         break;
yading@10:     case 39:
yading@10:         res = cin_decode_lzss(buf, bitmap_frame_size,
yading@10:                               cin->bitmap_table[CIN_CUR_BMP],
yading@10:                               cin->bitmap_size);
yading@10:         if (res < 0)
yading@10:             return res;
yading@10:         cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
yading@10:           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
yading@10:         break;
yading@10:     }
yading@10: 
yading@10:     if ((res = ff_reget_buffer(avctx, &cin->frame)) < 0)
yading@10:         return res;
yading@10: 
yading@10:     memcpy(cin->frame.data[1], cin->palette, sizeof(cin->palette));
yading@10:     cin->frame.palette_has_changed = 1;
yading@10:     for (y = 0; y < cin->avctx->height; ++y)
yading@10:         memcpy(cin->frame.data[0] + (cin->avctx->height - 1 - y) * cin->frame.linesize[0],
yading@10:           cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
yading@10:           cin->avctx->width);
yading@10: 
yading@10:     FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_table[CIN_PRE_BMP]);
yading@10: 
yading@10:     if ((res = av_frame_ref(data, &cin->frame)) < 0)
yading@10:         return res;
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     CinVideoContext *cin = avctx->priv_data;
yading@10: 
yading@10:     av_frame_unref(&cin->frame);
yading@10: 
yading@10:     destroy_buffers(cin);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     CinAudioContext *cin = avctx->priv_data;
yading@10: 
yading@10:     cin->initial_decode_frame = 1;
yading@10:     cin->delta                = 0;
yading@10:     avctx->sample_fmt         = AV_SAMPLE_FMT_S16;
yading@10:     avctx->channels           = 1;
yading@10:     avctx->channel_layout     = AV_CH_LAYOUT_MONO;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int cinaudio_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                                  int *got_frame_ptr, AVPacket *avpkt)
yading@10: {
yading@10:     AVFrame *frame     = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     CinAudioContext *cin = avctx->priv_data;
yading@10:     const uint8_t *buf_end = buf + avpkt->size;
yading@10:     int16_t *samples;
yading@10:     int delta, ret;
yading@10: 
yading@10:     /* get output buffer */
yading@10:     frame->nb_samples = avpkt->size - cin->initial_decode_frame;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10:     samples = (int16_t *)frame->data[0];
yading@10: 
yading@10:     delta = cin->delta;
yading@10:     if (cin->initial_decode_frame) {
yading@10:         cin->initial_decode_frame = 0;
yading@10:         delta = sign_extend(AV_RL16(buf), 16);
yading@10:         buf += 2;
yading@10:         *samples++ = delta;
yading@10:     }
yading@10:     while (buf < buf_end) {
yading@10:         delta += cinaudio_delta16_table[*buf++];
yading@10:         delta = av_clip_int16(delta);
yading@10:         *samples++ = delta;
yading@10:     }
yading@10:     cin->delta = delta;
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: 
yading@10: AVCodec ff_dsicinvideo_decoder = {
yading@10:     .name           = "dsicinvideo",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_DSICINVIDEO,
yading@10:     .priv_data_size = sizeof(CinVideoContext),
yading@10:     .init           = cinvideo_decode_init,
yading@10:     .close          = cinvideo_decode_end,
yading@10:     .decode         = cinvideo_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
yading@10: };
yading@10: 
yading@10: AVCodec ff_dsicinaudio_decoder = {
yading@10:     .name           = "dsicinaudio",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_DSICINAUDIO,
yading@10:     .priv_data_size = sizeof(CinAudioContext),
yading@10:     .init           = cinaudio_decode_init,
yading@10:     .decode         = cinaudio_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
yading@10: };