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++) {
81 int c = ir2_get_code(&ctx->gb);
82 if (c >= 0x80) { /* we have a skip */
84 if (out + c*2 > width)
85 return AVERROR_INVALIDDATA;
86 for (i = 0; i < c * 2; i++) {
87 dst[out] = dst[out - pitch];
90 } else { /* add two deltas from table */
91 int t = dst[out - pitch] + (table[c * 2] - 128);
95 t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
106 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
107 int pitch, const uint8_t *table)
115 return AVERROR_INVALIDDATA;
117 for (j = 0; j < height; j++) {
119 while (out < width) {
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);
126 t = av_clip_uint8(t);
129 t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
130 t = av_clip_uint8(t);
140 static int ir2_decode_frame(AVCodecContext *avctx,
141 void *data, int *got_frame,
144 Ir2Context * const s = avctx->priv_data;
145 const uint8_t *buf = avpkt->data;
146 int buf_size = avpkt->size;
147 AVFrame *picture = data;
148 AVFrame * const p = s->picture;
152 if ((ret = ff_reget_buffer(avctx, p)) < 0)
155 start = 48; /* hardcoded for now */
157 if (start >= buf_size) {
158 av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
159 return AVERROR_INVALIDDATA;
162 s->decode_delta = buf[18];
164 /* decide whether frame uses deltas or not */
165 #ifndef BITSTREAM_READER_LE
166 for (i = 0; i < buf_size; i++)
167 buf[i] = ff_reverse[buf[i]];
170 if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
173 ltab = buf[0x22] & 3;
174 ctab = buf[0x22] >> 2;
177 av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
178 return AVERROR_INVALIDDATA;
181 if (s->decode_delta) { /* intraframe */
182 if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
183 p->data[0], p->linesize[0],
184 ir2_delta_table[ltab])) < 0)
187 /* swapped U and V */
188 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
189 p->data[2], p->linesize[2],
190 ir2_delta_table[ctab])) < 0)
192 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
193 p->data[1], p->linesize[1],
194 ir2_delta_table[ctab])) < 0)
196 } else { /* interframe */
197 if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
198 p->data[0], p->linesize[0],
199 ir2_delta_table[ltab])) < 0)
201 /* swapped U and V */
202 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
203 p->data[2], p->linesize[2],
204 ir2_delta_table[ctab])) < 0)
206 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
207 p->data[1], p->linesize[1],
208 ir2_delta_table[ctab])) < 0)
212 if ((ret = av_frame_ref(picture, p)) < 0)
220 static av_cold int ir2_decode_init(AVCodecContext *avctx)
222 Ir2Context * const ic = avctx->priv_data;
223 static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
227 avctx->pix_fmt= AV_PIX_FMT_YUV410P;
229 ic->picture = av_frame_alloc();
231 return AVERROR(ENOMEM);
233 ir2_vlc.table = vlc_tables;
234 ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
235 #ifdef BITSTREAM_READER_LE
236 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
237 &ir2_codes[0][1], 4, 2,
238 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_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);
248 static av_cold int ir2_decode_end(AVCodecContext *avctx)
250 Ir2Context * const ic = avctx->priv_data;
252 av_frame_free(&ic->picture);
257 AVCodec ff_indeo2_decoder = {
259 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
260 .type = AVMEDIA_TYPE_VIDEO,
261 .id = AV_CODEC_ID_INDEO2,
262 .priv_data_size = sizeof(Ir2Context),
263 .init = ir2_decode_init,
264 .close = ir2_decode_end,
265 .decode = ir2_decode_frame,
266 .capabilities = AV_CODEC_CAP_DR1,