3 * Copyright (c) 2005 Konstantin Shishkov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Intel Indeo 2 decoder.
27 #define BITSTREAM_READER_LE
28 #include "libavutil/attributes.h"
31 #include "indeo2data.h"
34 typedef struct Ir2Context{
35 AVCodecContext *avctx;
41 #define CODE_VLC_BITS 14
44 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
45 static inline int ir2_get_code(GetBitContext *gb)
47 return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
50 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
62 /* first line contain absolute values, other lines contain deltas */
64 c = ir2_get_code(&ctx->gb);
65 if(c >= 0x80) { /* we have a run */
69 for (i = 0; i < c * 2; i++)
71 } else { /* copy two values from table */
72 dst[out++] = table[c * 2];
73 dst[out++] = table[(c * 2) + 1];
78 for (j = 1; j < height; j++){
81 c = ir2_get_code(&ctx->gb);
82 if(c >= 0x80) { /* we have a skip */
86 for (i = 0; i < c * 2; i++) {
87 dst[out] = dst[out - stride];
90 } else { /* add two deltas from table */
91 t = dst[out - stride] + (table[c * 2] - 128);
95 t = dst[out - stride] + (table[(c * 2) + 1] - 128);
106 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
107 const uint8_t *table)
117 for (j = 0; j < height; j++){
120 c = ir2_get_code(&ctx->gb);
121 if(c >= 0x80) { /* we have a skip */
124 } else { /* add two deltas from table */
125 t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
129 t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
140 static int ir2_decode_frame(AVCodecContext *avctx,
141 void *data, int *data_size,
144 const uint8_t *buf = avpkt->data;
145 int buf_size = avpkt->size;
146 Ir2Context * const s = avctx->priv_data;
147 AVFrame *picture = data;
148 AVFrame * const p = &s->picture;
152 p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
153 if (avctx->reget_buffer(avctx, p)) {
154 av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
158 start = 48; /* hardcoded for now */
160 if (start >= buf_size) {
161 av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
162 return AVERROR_INVALIDDATA;
165 s->decode_delta = buf[18];
167 /* decide whether frame uses deltas or not */
168 #ifndef BITSTREAM_READER_LE
169 for (i = 0; i < buf_size; i++)
170 buf[i] = ff_reverse[buf[i]];
173 init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
175 if (s->decode_delta) { /* intraframe */
176 ir2_decode_plane(s, avctx->width, avctx->height,
177 s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
178 /* swapped U and V */
179 ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
180 s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
181 ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
182 s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
183 } else { /* interframe */
184 ir2_decode_plane_inter(s, avctx->width, avctx->height,
185 s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
186 /* swapped U and V */
187 ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
188 s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
189 ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
190 s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
193 *picture = s->picture;
194 *data_size = sizeof(AVPicture);
199 static av_cold int ir2_decode_init(AVCodecContext *avctx){
200 Ir2Context * const ic = avctx->priv_data;
201 static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
203 avcodec_get_frame_defaults(&ic->picture);
206 avctx->pix_fmt= AV_PIX_FMT_YUV410P;
208 ir2_vlc.table = vlc_tables;
209 ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
210 #ifdef BITSTREAM_READER_LE
211 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
212 &ir2_codes[0][1], 4, 2,
213 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
215 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
216 &ir2_codes[0][1], 4, 2,
217 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
223 static av_cold int ir2_decode_end(AVCodecContext *avctx){
224 Ir2Context * const ic = avctx->priv_data;
225 AVFrame *pic = &ic->picture;
228 avctx->release_buffer(avctx, pic);
233 AVCodec ff_indeo2_decoder = {
235 .type = AVMEDIA_TYPE_VIDEO,
236 .id = AV_CODEC_ID_INDEO2,
237 .priv_data_size = sizeof(Ir2Context),
238 .init = ir2_decode_init,
239 .close = ir2_decode_end,
240 .decode = ir2_decode_frame,
241 .capabilities = CODEC_CAP_DR1,
242 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),