3 * Copyright (c) 2005 Konstantin Shishkov
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Intel Indeo 2 decoder.
27 #include "bitstream.h"
28 #include "indeo2data.h"
30 typedef struct Ir2Context{
31 AVCodecContext *avctx;
37 #define CODE_VLC_BITS 14
40 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
41 static inline int ir2_get_code(GetBitContext *gb)
45 code = get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
50 #define CLAMP_TO_BYTE(value) \
56 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
68 /* first line contain absolute values, other lines contain deltas */
70 c = ir2_get_code(&ctx->gb);
71 if(c > 0x80) { /* we have a run */
75 for (i = 0; i < c * 2; i++)
77 } else { /* copy two values from table */
78 dst[out++] = table[c * 2];
79 dst[out++] = table[(c * 2) + 1];
84 for (j = 1; j < height; j++){
87 c = ir2_get_code(&ctx->gb);
88 if(c > 0x80) { /* we have a skip */
92 for (i = 0; i < c * 2; i++) {
93 dst[out] = dst[out - stride];
96 } else { /* add two deltas from table */
97 t = dst[out - stride] + (table[c * 2] - 128);
101 t = dst[out - stride] + (table[(c * 2) + 1] - 128);
112 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
113 const uint8_t *table)
123 for (j = 0; j < height; j++){
126 c = ir2_get_code(&ctx->gb);
127 if(c > 0x80) { /* we have a skip */
130 } else { /* add two deltas from table */
131 t = dst[out] + (table[c * 2] - 128);
135 t = dst[out] + (table[(c * 2) + 1] - 128);
146 static int ir2_decode_frame(AVCodecContext *avctx,
147 void *data, int *data_size,
148 uint8_t *buf, int buf_size)
150 Ir2Context * const s = avctx->priv_data;
151 AVFrame *picture = data;
152 AVFrame * const p= (AVFrame*)&s->picture;
157 avctx->release_buffer(avctx, p);
160 p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
161 if (avctx->reget_buffer(avctx, p)) {
162 av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
166 s->decode_delta = buf[18];
168 /* decide whether frame uses deltas or not */
170 for (i = 0; i < buf_size; i++)
171 buf[i] = ff_reverse[buf[i]];
173 start = 48; /* hardcoded for now */
175 init_get_bits(&s->gb, buf + start, buf_size - start);
177 if (s->decode_delta) { /* intraframe */
178 ir2_decode_plane(s, avctx->width, avctx->height,
179 s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
180 /* swapped U and V */
181 ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
182 s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
183 ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
184 s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
185 } else { /* interframe */
186 ir2_decode_plane_inter(s, avctx->width, avctx->height,
187 s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
188 /* swapped U and V */
189 ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
190 s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
191 ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
192 s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
195 *picture= *(AVFrame*)&s->picture;
196 *data_size = sizeof(AVPicture);
201 static int ir2_decode_init(AVCodecContext *avctx){
202 Ir2Context * const ic = avctx->priv_data;
206 avctx->pix_fmt= PIX_FMT_YUV410P;
209 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
210 &ir2_codes[0][1], 4, 2,
211 &ir2_codes[0][0], 4, 2, 1);
216 AVCodec indeo2_decoder = {