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)
59 if ((width & 1) || width * height / (2*(IR2_CODES - 0x7F)) > get_bits_left(&ctx->gb))
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 */
73 return AVERROR_INVALIDDATA;
74 dst[out++] = table[c * 2];
75 dst[out++] = table[(c * 2) + 1];
80 for (j = 1; j < height; j++) {
84 if (get_bits_left(&ctx->gb) <= 0)
85 return AVERROR_INVALIDDATA;
86 c = ir2_get_code(&ctx->gb);
87 if (c >= 0x80) { /* we have a skip */
89 if (out + c*2 > width)
90 return AVERROR_INVALIDDATA;
91 for (i = 0; i < c * 2; i++) {
92 dst[out] = dst[out - pitch];
95 } else { /* add two deltas from table */
98 return AVERROR_INVALIDDATA;
99 t = dst[out - pitch] + (table[c * 2] - 128);
100 t = av_clip_uint8(t);
103 t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
104 t = av_clip_uint8(t);
114 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
115 int pitch, const uint8_t *table)
123 return AVERROR_INVALIDDATA;
125 for (j = 0; j < height; j++) {
127 while (out < width) {
128 if (get_bits_left(&ctx->gb) <= 0)
129 return AVERROR_INVALIDDATA;
130 c = ir2_get_code(&ctx->gb);
131 if (c >= 0x80) { /* we have a skip */
134 } else { /* add two deltas from table */
136 return AVERROR_INVALIDDATA;
137 t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
138 t = av_clip_uint8(t);
141 t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
142 t = av_clip_uint8(t);
152 static int ir2_decode_frame(AVCodecContext *avctx,
153 void *data, int *got_frame,
156 Ir2Context * const s = avctx->priv_data;
157 const uint8_t *buf = avpkt->data;
158 int buf_size = avpkt->size;
159 AVFrame *picture = data;
160 AVFrame * const p = s->picture;
164 if ((ret = ff_reget_buffer(avctx, p, 0)) < 0)
167 start = 48; /* hardcoded for now */
169 if (start >= buf_size) {
170 av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
171 return AVERROR_INVALIDDATA;
174 s->decode_delta = buf[18];
176 /* decide whether frame uses deltas or not */
178 if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
181 ltab = buf[0x22] & 3;
182 ctab = buf[0x22] >> 2;
185 av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
186 return AVERROR_INVALIDDATA;
189 if (s->decode_delta) { /* intraframe */
190 if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
191 p->data[0], p->linesize[0],
192 ir2_delta_table[ltab])) < 0)
195 /* swapped U and V */
196 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
197 p->data[2], p->linesize[2],
198 ir2_delta_table[ctab])) < 0)
200 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
201 p->data[1], p->linesize[1],
202 ir2_delta_table[ctab])) < 0)
204 } else { /* interframe */
205 if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
206 p->data[0], p->linesize[0],
207 ir2_delta_table[ltab])) < 0)
209 /* swapped U and V */
210 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
211 p->data[2], p->linesize[2],
212 ir2_delta_table[ctab])) < 0)
214 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
215 p->data[1], p->linesize[1],
216 ir2_delta_table[ctab])) < 0)
220 if ((ret = av_frame_ref(picture, p)) < 0)
228 static av_cold int ir2_decode_init(AVCodecContext *avctx)
230 Ir2Context * const ic = avctx->priv_data;
234 avctx->pix_fmt= AV_PIX_FMT_YUV410P;
236 ic->picture = av_frame_alloc();
238 return AVERROR(ENOMEM);
240 INIT_LE_VLC_STATIC(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
241 &ir2_codes[0][1], 4, 2,
242 &ir2_codes[0][0], 4, 2, 1 << CODE_VLC_BITS);
247 static av_cold int ir2_decode_end(AVCodecContext *avctx)
249 Ir2Context * const ic = avctx->priv_data;
251 av_frame_free(&ic->picture);
256 AVCodec ff_indeo2_decoder = {
258 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
259 .type = AVMEDIA_TYPE_VIDEO,
260 .id = AV_CODEC_ID_INDEO2,
261 .priv_data_size = sizeof(Ir2Context),
262 .init = ir2_decode_init,
263 .close = ir2_decode_end,
264 .decode = ir2_decode_frame,
265 .capabilities = AV_CODEC_CAP_DR1,