iff: use the AVFrame API properly.
[libav.git] / libavcodec / indeo2.c
CommitLineData
856dbbff 1/*
02c1592f 2 * Intel Indeo 2 codec
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3 * Copyright (c) 2005 Konstantin Shishkov
4 *
2912e87a 5 * This file is part of Libav.
b78e7197 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
856dbbff 11 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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.
16 *
17 * You should have received a copy of the GNU Lesser General Public
2912e87a 18 * License along with Libav; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
856dbbff 20 */
115329f1 21
856dbbff 22/**
ba87f080 23 * @file
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24 * Intel Indeo 2 decoder.
25 */
d5c62122 26
aaf47bcd 27#define BITSTREAM_READER_LE
d5c62122 28#include "libavutil/attributes.h"
856dbbff 29#include "avcodec.h"
9106a698 30#include "get_bits.h"
856dbbff 31#include "indeo2data.h"
759001c5 32#include "internal.h"
d5c62122 33#include "mathops.h"
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34
35typedef struct Ir2Context{
36 AVCodecContext *avctx;
37 AVFrame picture;
38 GetBitContext gb;
39 int decode_delta;
40} Ir2Context;
41
42#define CODE_VLC_BITS 14
43static VLC ir2_vlc;
44
45/* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
46static inline int ir2_get_code(GetBitContext *gb)
47{
8b39f75b 48 return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
856dbbff 49}
856dbbff 50
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51static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
52 int stride, const uint8_t *table)
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53{
54 int i;
55 int j;
56 int out = 0;
57 int c;
58 int t;
115329f1 59
c04c64c0 60 if (width & 1)
6ea2c9a4 61 return AVERROR_INVALIDDATA;
f707a5eb 62
856dbbff 63 /* first line contain absolute values, other lines contain deltas */
c04c64c0 64 while (out < width) {
856dbbff 65 c = ir2_get_code(&ctx->gb);
c04c64c0 66 if (c >= 0x80) { /* we have a run */
8b39f75b 67 c -= 0x7F;
c04c64c0 68 if (out + c*2 > width)
6ea2c9a4 69 return AVERROR_INVALIDDATA;
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70 for (i = 0; i < c * 2; i++)
71 dst[out++] = 0x80;
72 } else { /* copy two values from table */
73 dst[out++] = table[c * 2];
74 dst[out++] = table[(c * 2) + 1];
75 }
76 }
77 dst += stride;
115329f1 78
c04c64c0 79 for (j = 1; j < height; j++) {
856dbbff 80 out = 0;
c04c64c0 81 while (out < width) {
856dbbff 82 c = ir2_get_code(&ctx->gb);
c04c64c0 83 if (c >= 0x80) { /* we have a skip */
8b39f75b 84 c -= 0x7F;
c04c64c0 85 if (out + c*2 > width)
6ea2c9a4 86 return AVERROR_INVALIDDATA;
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87 for (i = 0; i < c * 2; i++) {
88 dst[out] = dst[out - stride];
89 out++;
90 }
91 } else { /* add two deltas from table */
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92 t = dst[out - stride] + (table[c * 2] - 128);
93 t = av_clip_uint8(t);
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94 dst[out] = t;
95 out++;
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96 t = dst[out - stride] + (table[(c * 2) + 1] - 128);
97 t = av_clip_uint8(t);
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98 dst[out] = t;
99 out++;
100 }
101 }
102 dst += stride;
103 }
f707a5eb 104 return 0;
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105}
106
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107static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
108 int stride, const uint8_t *table)
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109{
110 int j;
111 int out = 0;
112 int c;
113 int t;
f707a5eb 114
c04c64c0 115 if (width & 1)
6ea2c9a4 116 return AVERROR_INVALIDDATA;
f707a5eb 117
c04c64c0 118 for (j = 0; j < height; j++) {
856dbbff 119 out = 0;
c04c64c0 120 while (out < width) {
856dbbff 121 c = ir2_get_code(&ctx->gb);
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122 if (c >= 0x80) { /* we have a skip */
123 c -= 0x7F;
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124 out += c * 2;
125 } else { /* add two deltas from table */
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126 t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
127 t = av_clip_uint8(t);
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128 dst[out] = t;
129 out++;
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130 t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
131 t = av_clip_uint8(t);
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132 dst[out] = t;
133 out++;
134 }
135 }
136 dst += stride;
137 }
f707a5eb 138 return 0;
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139}
140
115329f1 141static int ir2_decode_frame(AVCodecContext *avctx,
df9b9567 142 void *data, int *got_frame,
7a00bbad 143 AVPacket *avpkt)
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144{
145 Ir2Context * const s = avctx->priv_data;
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146 const uint8_t *buf = avpkt->data;
147 int buf_size = avpkt->size;
148 AVFrame *picture = data;
149 AVFrame * const p = &s->picture;
6ea2c9a4 150 int start, ret;
856dbbff 151
759001c5 152 if ((ret = ff_reget_buffer(avctx, p)) < 0) {
856dbbff 153 av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
6ea2c9a4 154 return ret;
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155 }
156
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157 start = 48; /* hardcoded for now */
158
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;
162 }
163
856dbbff 164 s->decode_delta = buf[18];
115329f1 165
856dbbff 166 /* decide whether frame uses deltas or not */
aaf47bcd 167#ifndef BITSTREAM_READER_LE
856dbbff 168 for (i = 0; i < buf_size; i++)
d5c62122 169 buf[i] = ff_reverse[buf[i]];
ef56de32 170#endif
856dbbff 171
68ca330c 172 init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
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173
174 if (s->decode_delta) { /* intraframe */
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175 if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
176 s->picture.data[0], s->picture.linesize[0],
177 ir2_luma_table)) < 0)
178 return ret;
179
856dbbff 180 /* swapped U and V */
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181 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
182 s->picture.data[2], s->picture.linesize[2],
183 ir2_luma_table)) < 0)
184 return ret;
185 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
186 s->picture.data[1], s->picture.linesize[1],
187 ir2_luma_table)) < 0)
188 return ret;
856dbbff 189 } else { /* interframe */
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190 if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
191 s->picture.data[0], s->picture.linesize[0],
192 ir2_luma_table)) < 0)
193 return ret;
856dbbff 194 /* swapped U and V */
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195 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
196 s->picture.data[2], s->picture.linesize[2],
197 ir2_luma_table)) < 0)
198 return ret;
199 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
200 s->picture.data[1], s->picture.linesize[1],
201 ir2_luma_table)) < 0)
202 return ret;
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203 }
204
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205 if ((ret = av_frame_ref(picture, &s->picture)) < 0)
206 return ret;
207
df9b9567 208 *got_frame = 1;
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209
210 return buf_size;
211}
212
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213static av_cold int ir2_decode_init(AVCodecContext *avctx)
214{
856dbbff 215 Ir2Context * const ic = avctx->priv_data;
bd4110f9 216 static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
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217
218 ic->avctx = avctx;
219
716d413c 220 avctx->pix_fmt= AV_PIX_FMT_YUV410P;
115329f1 221
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222 avcodec_get_frame_defaults(&ic->picture);
223
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224 ir2_vlc.table = vlc_tables;
225 ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
aaf47bcd 226#ifdef BITSTREAM_READER_LE
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227 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
228 &ir2_codes[0][1], 4, 2,
bd4110f9 229 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
ef56de32 230#else
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231 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
232 &ir2_codes[0][1], 4, 2,
bd4110f9 233 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
ef56de32 234#endif
115329f1 235
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236 return 0;
237}
238
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239static av_cold int ir2_decode_end(AVCodecContext *avctx)
240{
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241 Ir2Context * const ic = avctx->priv_data;
242 AVFrame *pic = &ic->picture;
243
759001c5 244 av_frame_unref(pic);
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245
246 return 0;
247}
248
d36beb3f 249AVCodec ff_indeo2_decoder = {
ec6402b7 250 .name = "indeo2",
b2bed932 251 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
ec6402b7 252 .type = AVMEDIA_TYPE_VIDEO,
36ef5369 253 .id = AV_CODEC_ID_INDEO2,
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254 .priv_data_size = sizeof(Ir2Context),
255 .init = ir2_decode_init,
256 .close = ir2_decode_end,
257 .decode = ir2_decode_frame,
258 .capabilities = CODEC_CAP_DR1,
856dbbff 259};