3 * Copyright (c) 2005 Konstantin Shishkov
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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"
35 typedef struct Ir2Context{
36 AVCodecContext *avctx;
42 #define CODE_VLC_BITS 14
45 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
46 static inline int ir2_get_code(GetBitContext *gb)
48 return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
51 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
52 int pitch, const uint8_t *table)
61 return AVERROR_INVALIDDATA;
63 /* first line contain absolute values, other lines contain deltas */
65 c = ir2_get_code(&ctx->gb);
66 if (c >= 0x80) { /* we have a run */
68 if (out + c*2 > width)
69 return AVERROR_INVALIDDATA;
70 for (i = 0; i < c * 2; i++)
72 } else { /* copy two values from table */
73 dst[out++] = table[c * 2];
74 dst[out++] = table[(c * 2) + 1];
79 for (j = 1; j < height; j++) {
82 c = ir2_get_code(&ctx->gb);
83 if (c >= 0x80) { /* we have a skip */
85 if (out + c*2 > width)
86 return AVERROR_INVALIDDATA;
87 for (i = 0; i < c * 2; i++) {
88 dst[out] = dst[out - pitch];
91 } else { /* add two deltas from table */
92 t = dst[out - pitch] + (table[c * 2] - 128);
96 t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
107 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
108 int pitch, const uint8_t *table)
116 return AVERROR_INVALIDDATA;
118 for (j = 0; j < height; j++) {
120 while (out < width) {
121 c = ir2_get_code(&ctx->gb);
122 if (c >= 0x80) { /* we have a skip */
125 } else { /* add two deltas from table */
126 t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
127 t = av_clip_uint8(t);
130 t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
131 t = av_clip_uint8(t);
141 static int ir2_decode_frame(AVCodecContext *avctx,
142 void *data, int *got_frame,
145 Ir2Context * const s = avctx->priv_data;
146 const uint8_t *buf = avpkt->data;
147 int buf_size = avpkt->size;
148 AVFrame *picture = data;
149 AVFrame * const p = s->picture;
152 if ((ret = ff_reget_buffer(avctx, p)) < 0) {
153 av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
157 start = 48; /* hardcoded for now */
159 if (start >= buf_size) {
160 av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
161 return AVERROR_INVALIDDATA;
164 s->decode_delta = buf[18];
166 /* decide whether frame uses deltas or not */
167 #ifndef BITSTREAM_READER_LE
168 for (i = 0; i < buf_size; i++)
169 buf[i] = ff_reverse[buf[i]];
172 init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
174 if (s->decode_delta) { /* intraframe */
175 if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
176 p->data[0], p->linesize[0],
177 ir2_luma_table)) < 0)
180 /* swapped U and V */
181 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
182 p->data[2], p->linesize[2],
183 ir2_luma_table)) < 0)
185 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
186 p->data[1], p->linesize[1],
187 ir2_luma_table)) < 0)
189 } else { /* interframe */
190 if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
191 p->data[0], p->linesize[0],
192 ir2_luma_table)) < 0)
194 /* swapped U and V */
195 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
196 p->data[2], p->linesize[2],
197 ir2_luma_table)) < 0)
199 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
200 p->data[1], p->linesize[1],
201 ir2_luma_table)) < 0)
205 if ((ret = av_frame_ref(picture, p)) < 0)
213 static av_cold int ir2_decode_init(AVCodecContext *avctx)
215 Ir2Context * const ic = avctx->priv_data;
216 static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
220 avctx->pix_fmt= AV_PIX_FMT_YUV410P;
222 ic->picture = av_frame_alloc();
224 return AVERROR(ENOMEM);
226 ir2_vlc.table = vlc_tables;
227 ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
228 #ifdef BITSTREAM_READER_LE
229 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
230 &ir2_codes[0][1], 4, 2,
231 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
233 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
234 &ir2_codes[0][1], 4, 2,
235 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
241 static av_cold int ir2_decode_end(AVCodecContext *avctx)
243 Ir2Context * const ic = avctx->priv_data;
245 av_frame_free(&ic->picture);
250 AVCodec ff_indeo2_decoder = {
252 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
253 .type = AVMEDIA_TYPE_VIDEO,
254 .id = AV_CODEC_ID_INDEO2,
255 .priv_data_size = sizeof(Ir2Context),
256 .init = ir2_decode_init,
257 .close = ir2_decode_end,
258 .decode = ir2_decode_frame,
259 .capabilities = CODEC_CAP_DR1,