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https://github.com/FFmpeg/FFmpeg.git
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370 lines
12 KiB
C
370 lines
12 KiB
C
/*
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* Delphine Software International CIN Audio/Video Decoders
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* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Delphine Software International CIN audio/video decoders
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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typedef enum CinVideoBitmapIndex {
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CIN_CUR_BMP = 0, /* current */
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CIN_PRE_BMP = 1, /* previous */
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CIN_INT_BMP = 2 /* intermediate */
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} CinVideoBitmapIndex;
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typedef struct CinVideoContext {
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AVCodecContext *avctx;
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AVFrame frame;
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unsigned int bitmap_size;
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uint32_t palette[256];
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uint8_t *bitmap_table[3];
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} CinVideoContext;
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typedef struct CinAudioContext {
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AVCodecContext *avctx;
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int initial_decode_frame;
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int delta;
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} CinAudioContext;
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/* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */
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static const int16_t cinaudio_delta16_table[256] = {
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, -30210, -27853, -25680, -23677, -21829,
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-20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,
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-10508, -9689, -8933, -8236, -7593, -7001, -6455, -5951,
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-5487, -5059, -4664, -4300, -3964, -3655, -3370, -3107,
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-2865, -2641, -2435, -2245, -2070, -1908, -1759, -1622,
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-1495, -1379, -1271, -1172, -1080, -996, -918, -847,
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-781, -720, -663, -612, -564, -520, -479, -442,
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-407, -376, -346, -319, -294, -271, -250, -230,
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-212, -196, -181, -166, -153, -141, -130, -120,
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-111, -102, -94, -87, -80, -74, -68, -62,
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-58, -53, -49, -45, -41, -38, -35, -32,
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-30, -27, -25, -23, -21, -20, -18, -17,
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-15, -14, -13, -12, -11, -10, -9, -8,
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-7, -6, -5, -4, -3, -2, -1, 0,
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0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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17, 18, 20, 21, 23, 25, 27, 30,
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32, 35, 38, 41, 45, 49, 53, 58,
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62, 68, 74, 80, 87, 94, 102, 111,
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120, 130, 141, 153, 166, 181, 196, 212,
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230, 250, 271, 294, 319, 346, 376, 407,
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442, 479, 520, 564, 612, 663, 720, 781,
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847, 918, 996, 1080, 1172, 1271, 1379, 1495,
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1622, 1759, 1908, 2070, 2245, 2435, 2641, 2865,
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3107, 3370, 3655, 3964, 4300, 4664, 5059, 5487,
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5951, 6455, 7001, 7593, 8236, 8933, 9689, 10508,
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11398, 12362, 13408, 14543, 15774, 17108, 18556, 20126,
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21829, 23677, 25680, 27853, 30210, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0
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};
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static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
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{
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CinVideoContext *cin = avctx->priv_data;
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unsigned int i;
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cin->avctx = avctx;
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avctx->pix_fmt = PIX_FMT_PAL8;
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cin->frame.data[0] = NULL;
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cin->bitmap_size = avctx->width * avctx->height;
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for (i = 0; i < 3; ++i) {
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cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
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if (!cin->bitmap_table[i])
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av_log(avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
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}
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return 0;
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}
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static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, int size)
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{
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while (size--)
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*dst++ += *src++;
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}
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static int cin_decode_huffman(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
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{
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int b, huff_code = 0;
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unsigned char huff_code_table[15];
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unsigned char *dst_cur = dst;
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unsigned char *dst_end = dst + dst_size;
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const unsigned char *src_end = src + src_size;
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memcpy(huff_code_table, src, 15); src += 15; src_size -= 15;
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while (src < src_end) {
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huff_code = *src++;
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if ((huff_code >> 4) == 15) {
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b = huff_code << 4;
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huff_code = *src++;
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*dst_cur++ = b | (huff_code >> 4);
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} else
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*dst_cur++ = huff_code_table[huff_code >> 4];
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if (dst_cur >= dst_end)
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break;
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huff_code &= 15;
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if (huff_code == 15) {
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*dst_cur++ = *src++;
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} else
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*dst_cur++ = huff_code_table[huff_code];
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if (dst_cur >= dst_end)
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break;
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}
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return dst_cur - dst;
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}
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static void cin_decode_lzss(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
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{
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uint16_t cmd;
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int i, sz, offset, code;
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unsigned char *dst_end = dst + dst_size;
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const unsigned char *src_end = src + src_size;
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while (src < src_end && dst < dst_end) {
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code = *src++;
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for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
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if (code & (1 << i)) {
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*dst++ = *src++;
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} else {
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cmd = AV_RL16(src); src += 2;
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offset = cmd >> 4;
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sz = (cmd & 0xF) + 2;
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/* don't use memcpy/memmove here as the decoding routine (ab)uses */
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/* buffer overlappings to repeat bytes in the destination */
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sz = FFMIN(sz, dst_end - dst);
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while (sz--) {
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*dst = *(dst - offset - 1);
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++dst;
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}
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}
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}
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}
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}
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static void cin_decode_rle(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
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{
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int len, code;
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unsigned char *dst_end = dst + dst_size;
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const unsigned char *src_end = src + src_size;
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while (src < src_end && dst < dst_end) {
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code = *src++;
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if (code & 0x80) {
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len = code - 0x7F;
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memset(dst, *src++, FFMIN(len, dst_end - dst));
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} else {
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len = code + 1;
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memcpy(dst, src, FFMIN(len, dst_end - dst));
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src += len;
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}
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dst += len;
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}
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}
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static int cinvideo_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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CinVideoContext *cin = avctx->priv_data;
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int i, y, palette_type, palette_colors_count, bitmap_frame_type, bitmap_frame_size;
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cin->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, &cin->frame)) {
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av_log(cin->avctx, AV_LOG_ERROR, "delphinecinvideo: reget_buffer() failed to allocate a frame\n");
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return -1;
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}
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palette_type = buf[0];
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palette_colors_count = AV_RL16(buf+1);
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bitmap_frame_type = buf[3];
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buf += 4;
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bitmap_frame_size = buf_size - 4;
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/* handle palette */
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if (palette_type == 0) {
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for (i = 0; i < palette_colors_count; ++i) {
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cin->palette[i] = bytestream_get_le24(&buf);
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bitmap_frame_size -= 3;
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}
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} else {
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for (i = 0; i < palette_colors_count; ++i) {
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cin->palette[buf[0]] = AV_RL24(buf+1);
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buf += 4;
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bitmap_frame_size -= 4;
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}
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}
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memcpy(cin->frame.data[1], cin->palette, sizeof(cin->palette));
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cin->frame.palette_has_changed = 1;
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/* note: the decoding routines below assumes that surface.width = surface.pitch */
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switch (bitmap_frame_type) {
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case 9:
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cin_decode_rle(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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case 34:
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cin_decode_rle(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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case 35:
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cin_decode_huffman(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
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cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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case 36:
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bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
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cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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case 37:
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cin_decode_huffman(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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case 38:
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cin_decode_lzss(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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case 39:
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cin_decode_lzss(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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}
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for (y = 0; y < cin->avctx->height; ++y)
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memcpy(cin->frame.data[0] + (cin->avctx->height - 1 - y) * cin->frame.linesize[0],
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cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
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cin->avctx->width);
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FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_table[CIN_PRE_BMP]);
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*data_size = sizeof(AVFrame);
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*(AVFrame *)data = cin->frame;
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return buf_size;
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}
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static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
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{
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CinVideoContext *cin = avctx->priv_data;
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int i;
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if (cin->frame.data[0])
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avctx->release_buffer(avctx, &cin->frame);
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for (i = 0; i < 3; ++i)
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av_free(cin->bitmap_table[i]);
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return 0;
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}
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static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
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{
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CinAudioContext *cin = avctx->priv_data;
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cin->avctx = avctx;
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cin->initial_decode_frame = 1;
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cin->delta = 0;
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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return 0;
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}
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static int cinaudio_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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CinAudioContext *cin = avctx->priv_data;
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const uint8_t *src = buf;
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int16_t *samples = (int16_t *)data;
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buf_size = FFMIN(buf_size, *data_size/2);
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if (cin->initial_decode_frame) {
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cin->initial_decode_frame = 0;
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cin->delta = (int16_t)AV_RL16(src); src += 2;
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*samples++ = cin->delta;
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buf_size -= 2;
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}
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while (buf_size > 0) {
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cin->delta += cinaudio_delta16_table[*src++];
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cin->delta = av_clip_int16(cin->delta);
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*samples++ = cin->delta;
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--buf_size;
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}
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*data_size = (uint8_t *)samples - (uint8_t *)data;
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return src - buf;
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}
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AVCodec ff_dsicinvideo_decoder = {
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"dsicinvideo",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_DSICINVIDEO,
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sizeof(CinVideoContext),
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cinvideo_decode_init,
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NULL,
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cinvideo_decode_end,
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cinvideo_decode_frame,
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CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
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};
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AVCodec ff_dsicinaudio_decoder = {
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"dsicinaudio",
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AVMEDIA_TYPE_AUDIO,
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CODEC_ID_DSICINAUDIO,
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sizeof(CinAudioContext),
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cinaudio_decode_init,
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NULL,
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NULL,
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cinaudio_decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
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};
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