lavc: fix decode_frame() third parameter semantics for video decoders
[libav.git] / libavcodec / motionpixels.c
1 /*
2 * Motion Pixels Video Decoder
3 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
4 *
5 * This file is part of Libav.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include "avcodec.h"
23 #include "get_bits.h"
24 #include "dsputil.h"
25
26 #define MAX_HUFF_CODES 16
27
28 #include "motionpixels_tablegen.h"
29
30 typedef struct HuffCode {
31 int code;
32 uint8_t size;
33 uint8_t delta;
34 } HuffCode;
35
36 typedef struct MotionPixelsContext {
37 AVCodecContext *avctx;
38 AVFrame frame;
39 DSPContext dsp;
40 uint8_t *changes_map;
41 int offset_bits_len;
42 int codes_count, current_codes_count;
43 int max_codes_bits;
44 HuffCode codes[MAX_HUFF_CODES];
45 VLC vlc;
46 YuvPixel *vpt, *hpt;
47 uint8_t gradient_scale[3];
48 uint8_t *bswapbuf;
49 int bswapbuf_size;
50 } MotionPixelsContext;
51
52 static av_cold int mp_decode_init(AVCodecContext *avctx)
53 {
54 MotionPixelsContext *mp = avctx->priv_data;
55 int w4 = (avctx->width + 3) & ~3;
56 int h4 = (avctx->height + 3) & ~3;
57
58 motionpixels_tableinit();
59 mp->avctx = avctx;
60 ff_dsputil_init(&mp->dsp, avctx);
61 mp->changes_map = av_mallocz(avctx->width * h4);
62 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
63 mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
64 mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel));
65 avctx->pix_fmt = AV_PIX_FMT_RGB555;
66 return 0;
67 }
68
69 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
70 {
71 uint16_t *pixels;
72 int offset, w, h, color = 0, x, y, i;
73
74 while (count--) {
75 offset = get_bits_long(gb, mp->offset_bits_len);
76 w = get_bits(gb, bits_len) + 1;
77 h = get_bits(gb, bits_len) + 1;
78 if (read_color)
79 color = get_bits(gb, 15);
80 x = offset % mp->avctx->width;
81 y = offset / mp->avctx->width;
82 if (y >= mp->avctx->height)
83 continue;
84 w = FFMIN(w, mp->avctx->width - x);
85 h = FFMIN(h, mp->avctx->height - y);
86 pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
87 while (h--) {
88 mp->changes_map[offset] = w;
89 if (read_color)
90 for (i = 0; i < w; ++i)
91 pixels[i] = color;
92 offset += mp->avctx->width;
93 pixels += mp->frame.linesize[0] / 2;
94 }
95 }
96 }
97
98 static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
99 {
100 while (get_bits1(gb)) {
101 ++size;
102 if (size > mp->max_codes_bits) {
103 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
104 return;
105 }
106 code <<= 1;
107 mp_get_code(mp, gb, size, code + 1);
108 }
109 if (mp->current_codes_count >= MAX_HUFF_CODES) {
110 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
111 return;
112 }
113 mp->codes[mp->current_codes_count ].code = code;
114 mp->codes[mp->current_codes_count++].size = size;
115 }
116
117 static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
118 {
119 if (mp->codes_count == 1) {
120 mp->codes[0].delta = get_bits(gb, 4);
121 } else {
122 int i;
123
124 mp->max_codes_bits = get_bits(gb, 4);
125 for (i = 0; i < mp->codes_count; ++i)
126 mp->codes[i].delta = get_bits(gb, 4);
127 mp->current_codes_count = 0;
128 mp_get_code(mp, gb, 0, 0);
129 }
130 }
131
132 static int mp_gradient(MotionPixelsContext *mp, int component, int v)
133 {
134 int delta;
135
136 delta = (v - 7) * mp->gradient_scale[component];
137 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
138 return delta;
139 }
140
141 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
142 {
143 int color;
144
145 color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
146 return mp_rgb_yuv_table[color];
147 }
148
149 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
150 {
151 int color;
152
153 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
154 *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color;
155 }
156
157 static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
158 {
159 int i;
160
161 i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
162 return mp->codes[i].delta;
163 }
164
165 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
166 {
167 YuvPixel p;
168 const int y0 = y * mp->avctx->width;
169 int w, i, x = 0;
170
171 p = mp->vpt[y];
172 if (mp->changes_map[y0 + x] == 0) {
173 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
174 ++x;
175 }
176 while (x < mp->avctx->width) {
177 w = mp->changes_map[y0 + x];
178 if (w != 0) {
179 if ((y & 3) == 0) {
180 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
181 mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
182 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
183 for (i = (x + 3) & ~3; i < x + w; i += 4) {
184 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
185 }
186 }
187 }
188 x += w;
189 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
190 p = mp_get_yuv_from_rgb(mp, x - 1, y);
191 } else {
192 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
193 p.y = av_clip(p.y, 0, 31);
194 if ((x & 3) == 0) {
195 if ((y & 3) == 0) {
196 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
197 p.v = av_clip(p.v, -32, 31);
198 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
199 p.u = av_clip(p.u, -32, 31);
200 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
201 } else {
202 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
203 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
204 }
205 }
206 mp_set_rgb_from_yuv(mp, x, y, &p);
207 ++x;
208 }
209 }
210 }
211
212 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
213 {
214 YuvPixel p;
215 int y, y0;
216
217 for (y = 0; y < mp->avctx->height; ++y) {
218 if (mp->changes_map[y * mp->avctx->width] != 0) {
219 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
220 p = mp_get_yuv_from_rgb(mp, 0, y);
221 } else {
222 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
223 p.y = av_clip(p.y, 0, 31);
224 if ((y & 3) == 0) {
225 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
226 p.v = av_clip(p.v, -32, 31);
227 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
228 p.u = av_clip(p.u, -32, 31);
229 }
230 mp->vpt[y] = p;
231 mp_set_rgb_from_yuv(mp, 0, y, &p);
232 }
233 }
234 for (y0 = 0; y0 < 2; ++y0)
235 for (y = y0; y < mp->avctx->height; y += 2)
236 mp_decode_line(mp, gb, y);
237 }
238
239 static int mp_decode_frame(AVCodecContext *avctx,
240 void *data, int *got_frame,
241 AVPacket *avpkt)
242 {
243 const uint8_t *buf = avpkt->data;
244 int buf_size = avpkt->size;
245 MotionPixelsContext *mp = avctx->priv_data;
246 GetBitContext gb;
247 int i, count1, count2, sz;
248
249 mp->frame.reference = 1;
250 mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
251 if (avctx->reget_buffer(avctx, &mp->frame)) {
252 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
253 return -1;
254 }
255
256 /* le32 bitstream msb first */
257 av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
258 if (!mp->bswapbuf)
259 return AVERROR(ENOMEM);
260 mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
261 if (buf_size & 3)
262 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
263 memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
264 init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
265
266 memset(mp->changes_map, 0, avctx->width * avctx->height);
267 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
268 count1 = get_bits(&gb, 12);
269 count2 = get_bits(&gb, 12);
270 mp_read_changes_map(mp, &gb, count1, 8, i);
271 mp_read_changes_map(mp, &gb, count2, 4, i);
272 }
273
274 mp->codes_count = get_bits(&gb, 4);
275 if (mp->codes_count == 0)
276 goto end;
277
278 if (mp->changes_map[0] == 0) {
279 *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
280 mp->changes_map[0] = 1;
281 }
282 mp_read_codes_table(mp, &gb);
283
284 sz = get_bits(&gb, 18);
285 if (avctx->extradata[0] != 5)
286 sz += get_bits(&gb, 18);
287 if (sz == 0)
288 goto end;
289
290 if (mp->max_codes_bits <= 0)
291 goto end;
292 if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0))
293 goto end;
294 mp_decode_frame_helper(mp, &gb);
295 ff_free_vlc(&mp->vlc);
296
297 end:
298 *got_frame = 1;
299 *(AVFrame *)data = mp->frame;
300 return buf_size;
301 }
302
303 static av_cold int mp_decode_end(AVCodecContext *avctx)
304 {
305 MotionPixelsContext *mp = avctx->priv_data;
306
307 av_freep(&mp->changes_map);
308 av_freep(&mp->vpt);
309 av_freep(&mp->hpt);
310 av_freep(&mp->bswapbuf);
311 if (mp->frame.data[0])
312 avctx->release_buffer(avctx, &mp->frame);
313
314 return 0;
315 }
316
317 AVCodec ff_motionpixels_decoder = {
318 .name = "motionpixels",
319 .type = AVMEDIA_TYPE_VIDEO,
320 .id = AV_CODEC_ID_MOTIONPIXELS,
321 .priv_data_size = sizeof(MotionPixelsContext),
322 .init = mp_decode_init,
323 .close = mp_decode_end,
324 .decode = mp_decode_frame,
325 .capabilities = CODEC_CAP_DR1,
326 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
327 };