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 #include "libavutil/attributes.h"
29 #define BITSTREAM_READER_LE
32 #include "indeo2data.h"
36 typedef struct Ir2Context{
37 AVCodecContext *avctx;
43 #define CODE_VLC_BITS 14
46 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
47 static inline int ir2_get_code(GetBitContext *gb)
49 return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
52 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
53 int pitch, const uint8_t *table)
60 return AVERROR_INVALIDDATA;
62 /* first line contain absolute values, other lines contain deltas */
64 int c = ir2_get_code(&ctx->gb);
65 if (c >= 0x80) { /* we have a run */
67 if (out + c*2 > width)
68 return AVERROR_INVALIDDATA;
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++) {
80 if (get_bits_left(&ctx->gb) <= 0)
81 return AVERROR_INVALIDDATA;
83 int c = ir2_get_code(&ctx->gb);
84 if (c >= 0x80) { /* we have a skip */
86 if (out + c*2 > width)
87 return AVERROR_INVALIDDATA;
88 for (i = 0; i < c * 2; i++) {
89 dst[out] = dst[out - pitch];
92 } else { /* add two deltas from table */
93 int t = dst[out - pitch] + (table[c * 2] - 128);
97 t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
108 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
109 int pitch, const uint8_t *table)
117 return AVERROR_INVALIDDATA;
119 for (j = 0; j < height; j++) {
121 if (get_bits_left(&ctx->gb) <= 0)
122 return AVERROR_INVALIDDATA;
123 while (out < width) {
124 c = ir2_get_code(&ctx->gb);
125 if (c >= 0x80) { /* we have a skip */
128 } else { /* add two deltas from table */
129 t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
130 t = av_clip_uint8(t);
133 t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
134 t = av_clip_uint8(t);
144 static int ir2_decode_frame(AVCodecContext *avctx,
145 void *data, int *got_frame,
148 Ir2Context * const s = avctx->priv_data;
149 const uint8_t *buf = avpkt->data;
150 int buf_size = avpkt->size;
151 AVFrame *picture = data;
152 AVFrame * const p = s->picture;
156 if ((ret = ff_reget_buffer(avctx, p)) < 0)
159 start = 48; /* hardcoded for now */
161 if (start >= buf_size) {
162 av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
163 return AVERROR_INVALIDDATA;
166 s->decode_delta = buf[18];
168 /* decide whether frame uses deltas or not */
169 #ifndef BITSTREAM_READER_LE
170 for (i = 0; i < buf_size; i++)
171 buf[i] = ff_reverse[buf[i]];
174 if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
177 ltab = buf[0x22] & 3;
178 ctab = buf[0x22] >> 2;
181 av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
182 return AVERROR_INVALIDDATA;
185 if (s->decode_delta) { /* intraframe */
186 if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
187 p->data[0], p->linesize[0],
188 ir2_delta_table[ltab])) < 0)
191 /* swapped U and V */
192 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
193 p->data[2], p->linesize[2],
194 ir2_delta_table[ctab])) < 0)
196 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
197 p->data[1], p->linesize[1],
198 ir2_delta_table[ctab])) < 0)
200 } else { /* interframe */
201 if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
202 p->data[0], p->linesize[0],
203 ir2_delta_table[ltab])) < 0)
205 /* swapped U and V */
206 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
207 p->data[2], p->linesize[2],
208 ir2_delta_table[ctab])) < 0)
210 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
211 p->data[1], p->linesize[1],
212 ir2_delta_table[ctab])) < 0)
216 if ((ret = av_frame_ref(picture, p)) < 0)
224 static av_cold int ir2_decode_init(AVCodecContext *avctx)
226 Ir2Context * const ic = avctx->priv_data;
227 static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
231 avctx->pix_fmt= AV_PIX_FMT_YUV410P;
233 ic->picture = av_frame_alloc();
235 return AVERROR(ENOMEM);
237 ir2_vlc.table = vlc_tables;
238 ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
239 #ifdef BITSTREAM_READER_LE
240 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
241 &ir2_codes[0][1], 4, 2,
242 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
244 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
245 &ir2_codes[0][1], 4, 2,
246 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
252 static av_cold int ir2_decode_end(AVCodecContext *avctx)
254 Ir2Context * const ic = avctx->priv_data;
256 av_frame_free(&ic->picture);
261 AVCodec ff_indeo2_decoder = {
263 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
264 .type = AVMEDIA_TYPE_VIDEO,
265 .id = AV_CODEC_ID_INDEO2,
266 .priv_data_size = sizeof(Ir2Context),
267 .init = ir2_decode_init,
268 .close = ir2_decode_end,
269 .decode = ir2_decode_frame,
270 .capabilities = AV_CODEC_CAP_DR1,