Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / a64multienc.c
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2ba45a60
DM
1/*
2 * a64 video encoder - multicolor modes
3 * Copyright (c) 2009 Tobias Bindhammer
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22/**
23 * @file
24 * a64 video encoder - multicolor modes
25 */
26
27#include "a64colors.h"
28#include "a64tables.h"
29#include "elbg.h"
30#include "internal.h"
31#include "libavutil/common.h"
32#include "libavutil/intreadwrite.h"
33
34#define DITHERSTEPS 8
35#define CHARSET_CHARS 256
36#define INTERLACED 1
37#define CROP_SCREENS 1
38
39#define C64XRES 320
40#define C64YRES 200
41
42typedef struct A64Context {
43 /* variables for multicolor modes */
44 AVLFG randctx;
45 int mc_lifetime;
46 int mc_use_5col;
47 unsigned mc_frame_counter;
48 int *mc_meta_charset;
49 int *mc_charmap;
50 int *mc_best_cb;
51 int mc_luma_vals[5];
52 uint8_t *mc_charset;
53 uint8_t *mc_colram;
54 uint8_t *mc_palette;
55 int mc_pal_size;
56
57 /* pts of the next packet that will be output */
58 int64_t next_pts;
59} A64Context;
60
61/* gray gradient */
62static const int mc_colors[5]={0x0,0xb,0xc,0xf,0x1};
63
64/* other possible gradients - to be tested */
65//static const int mc_colors[5]={0x0,0x8,0xa,0xf,0x7};
66//static const int mc_colors[5]={0x0,0x9,0x8,0xa,0x3};
67
68static void to_meta_with_crop(AVCodecContext *avctx, AVFrame *p, int *dest)
69{
70 int blockx, blocky, x, y;
71 int luma = 0;
72 int height = FFMIN(avctx->height, C64YRES);
73 int width = FFMIN(avctx->width , C64XRES);
74 uint8_t *src = p->data[0];
75
76 for (blocky = 0; blocky < C64YRES; blocky += 8) {
77 for (blockx = 0; blockx < C64XRES; blockx += 8) {
78 for (y = blocky; y < blocky + 8 && y < C64YRES; y++) {
79 for (x = blockx; x < blockx + 8 && x < C64XRES; x += 2) {
80 if(x < width && y < height) {
81 /* build average over 2 pixels */
82 luma = (src[(x + 0 + y * p->linesize[0])] +
83 src[(x + 1 + y * p->linesize[0])]) / 2;
84 /* write blocks as linear data now so they are suitable for elbg */
85 dest[0] = luma;
86 }
87 dest++;
88 }
89 }
90 }
91 }
92}
93
94static void render_charset(AVCodecContext *avctx, uint8_t *charset,
95 uint8_t *colrammap)
96{
97 A64Context *c = avctx->priv_data;
98 uint8_t row1, row2;
99 int charpos, x, y;
100 int a, b;
101 uint8_t pix;
102 int lowdiff, highdiff;
103 int *best_cb = c->mc_best_cb;
104 static uint8_t index1[256];
105 static uint8_t index2[256];
106 static uint8_t dither[256];
107 int i;
108 int distance;
109
110 /* generate lookup-tables for dither and index before looping */
111 i = 0;
112 for (a=0; a < 256; a++) {
113 if(i < c->mc_pal_size -1 && a == c->mc_luma_vals[i + 1]) {
114 distance = c->mc_luma_vals[i + 1] - c->mc_luma_vals[i];
115 for(b = 0; b <= distance; b++) {
116 dither[c->mc_luma_vals[i] + b] = b * (DITHERSTEPS - 1) / distance;
117 }
118 i++;
119 }
120 if(i >= c->mc_pal_size - 1) dither[a] = 0;
121 index1[a] = i;
122 index2[a] = FFMIN(i + 1, c->mc_pal_size - 1);
123 }
124
125 /* and render charset */
126 for (charpos = 0; charpos < CHARSET_CHARS; charpos++) {
127 lowdiff = 0;
128 highdiff = 0;
129 for (y = 0; y < 8; y++) {
130 row1 = 0; row2 = 0;
131 for (x = 0; x < 4; x++) {
132 pix = best_cb[y * 4 + x];
133
134 /* accumulate error for brightest/darkest color */
135 if (index1[pix] >= 3)
136 highdiff += pix - c->mc_luma_vals[3];
137 if (index1[pix] < 1)
138 lowdiff += c->mc_luma_vals[1] - pix;
139
140 row1 <<= 2;
141
142 if (INTERLACED) {
143 row2 <<= 2;
144 if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 0][x & 3])
145 row1 |= 3-(index2[pix] & 3);
146 else
147 row1 |= 3-(index1[pix] & 3);
148
149 if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 1][x & 3])
150 row2 |= 3-(index2[pix] & 3);
151 else
152 row2 |= 3-(index1[pix] & 3);
153 }
154 else {
155 if (multi_dither_patterns[dither[pix]][(y & 3)][x & 3])
156 row1 |= 3-(index2[pix] & 3);
157 else
158 row1 |= 3-(index1[pix] & 3);
159 }
160 }
161 charset[y+0x000] = row1;
162 if (INTERLACED) charset[y+0x800] = row2;
163 }
164 /* do we need to adjust pixels? */
165 if (highdiff > 0 && lowdiff > 0 && c->mc_use_5col) {
166 if (lowdiff > highdiff) {
167 for (x = 0; x < 32; x++)
168 best_cb[x] = FFMIN(c->mc_luma_vals[3], best_cb[x]);
169 } else {
170 for (x = 0; x < 32; x++)
171 best_cb[x] = FFMAX(c->mc_luma_vals[1], best_cb[x]);
172 }
173 charpos--; /* redo now adjusted char */
174 /* no adjustment needed, all fine */
175 } else {
176 /* advance pointers */
177 best_cb += 32;
178 charset += 8;
179
180 /* remember colorram value */
181 colrammap[charpos] = (highdiff > 0);
182 }
183 }
184}
185
186static av_cold int a64multi_close_encoder(AVCodecContext *avctx)
187{
188 A64Context *c = avctx->priv_data;
189 av_frame_free(&avctx->coded_frame);
190 av_freep(&c->mc_meta_charset);
191 av_freep(&c->mc_best_cb);
192 av_freep(&c->mc_charset);
193 av_freep(&c->mc_charmap);
194 av_freep(&c->mc_colram);
195 return 0;
196}
197
198static av_cold int a64multi_encode_init(AVCodecContext *avctx)
199{
200 A64Context *c = avctx->priv_data;
201 int a;
202 av_lfg_init(&c->randctx, 1);
203
204 if (avctx->global_quality < 1) {
205 c->mc_lifetime = 4;
206 } else {
207 c->mc_lifetime = avctx->global_quality /= FF_QP2LAMBDA;
208 }
209
210 av_log(avctx, AV_LOG_INFO, "charset lifetime set to %d frame(s)\n", c->mc_lifetime);
211
212 c->mc_frame_counter = 0;
213 c->mc_use_5col = avctx->codec->id == AV_CODEC_ID_A64_MULTI5;
214 c->mc_pal_size = 4 + c->mc_use_5col;
215
216 /* precalc luma values for later use */
217 for (a = 0; a < c->mc_pal_size; a++) {
218 c->mc_luma_vals[a]=a64_palette[mc_colors[a]][0] * 0.30 +
219 a64_palette[mc_colors[a]][1] * 0.59 +
220 a64_palette[mc_colors[a]][2] * 0.11;
221 }
222
223 if (!(c->mc_meta_charset = av_malloc_array(c->mc_lifetime, 32000 * sizeof(int))) ||
224 !(c->mc_best_cb = av_malloc(CHARSET_CHARS * 32 * sizeof(int))) ||
225 !(c->mc_charmap = av_mallocz_array(c->mc_lifetime, 1000 * sizeof(int))) ||
226 !(c->mc_colram = av_mallocz(CHARSET_CHARS * sizeof(uint8_t))) ||
227 !(c->mc_charset = av_malloc(0x800 * (INTERLACED+1) * sizeof(uint8_t)))) {
228 av_log(avctx, AV_LOG_ERROR, "Failed to allocate buffer memory.\n");
229 return AVERROR(ENOMEM);
230 }
231
232 /* set up extradata */
233 if (!(avctx->extradata = av_mallocz(8 * 4 + FF_INPUT_BUFFER_PADDING_SIZE))) {
234 av_log(avctx, AV_LOG_ERROR, "Failed to allocate memory for extradata.\n");
235 return AVERROR(ENOMEM);
236 }
237 avctx->extradata_size = 8 * 4;
238 AV_WB32(avctx->extradata, c->mc_lifetime);
239 AV_WB32(avctx->extradata + 16, INTERLACED);
240
241 avctx->coded_frame = av_frame_alloc();
242 if (!avctx->coded_frame) {
243 a64multi_close_encoder(avctx);
244 return AVERROR(ENOMEM);
245 }
246
247 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
248 avctx->coded_frame->key_frame = 1;
249 if (!avctx->codec_tag)
250 avctx->codec_tag = AV_RL32("a64m");
251
252 c->next_pts = AV_NOPTS_VALUE;
253
254 return 0;
255}
256
257static void a64_compress_colram(unsigned char *buf, int *charmap, uint8_t *colram)
258{
259 int a;
260 uint8_t temp;
261 /* only needs to be done in 5col mode */
262 /* XXX could be squeezed to 0x80 bytes */
263 for (a = 0; a < 256; a++) {
264 temp = colram[charmap[a + 0x000]] << 0;
265 temp |= colram[charmap[a + 0x100]] << 1;
266 temp |= colram[charmap[a + 0x200]] << 2;
267 if (a < 0xe8) temp |= colram[charmap[a + 0x300]] << 3;
268 buf[a] = temp << 2;
269 }
270}
271
272static int a64multi_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
273 const AVFrame *pict, int *got_packet)
274{
275 A64Context *c = avctx->priv_data;
276 AVFrame *const p = avctx->coded_frame;
277
278 int frame;
279 int x, y;
280 int b_height;
281 int b_width;
282
283 int req_size, ret;
284 uint8_t *buf = NULL;
285
286 int *charmap = c->mc_charmap;
287 uint8_t *colram = c->mc_colram;
288 uint8_t *charset = c->mc_charset;
289 int *meta = c->mc_meta_charset;
290 int *best_cb = c->mc_best_cb;
291
292 int charset_size = 0x800 * (INTERLACED + 1);
293 int colram_size = 0x100 * c->mc_use_5col;
294 int screen_size;
295
296 if(CROP_SCREENS) {
297 b_height = FFMIN(avctx->height,C64YRES) >> 3;
298 b_width = FFMIN(avctx->width ,C64XRES) >> 3;
299 screen_size = b_width * b_height;
300 } else {
301 b_height = C64YRES >> 3;
302 b_width = C64XRES >> 3;
303 screen_size = 0x400;
304 }
305
306 /* no data, means end encoding asap */
307 if (!pict) {
308 /* all done, end encoding */
309 if (!c->mc_lifetime) return 0;
310 /* no more frames in queue, prepare to flush remaining frames */
311 if (!c->mc_frame_counter) {
312 c->mc_lifetime = 0;
313 }
314 /* still frames in queue so limit lifetime to remaining frames */
315 else c->mc_lifetime = c->mc_frame_counter;
316 /* still new data available */
317 } else {
318 /* fill up mc_meta_charset with data until lifetime exceeds */
319 if (c->mc_frame_counter < c->mc_lifetime) {
320 *p = *pict;
321 p->pict_type = AV_PICTURE_TYPE_I;
322 p->key_frame = 1;
323 to_meta_with_crop(avctx, p, meta + 32000 * c->mc_frame_counter);
324 c->mc_frame_counter++;
325 if (c->next_pts == AV_NOPTS_VALUE)
326 c->next_pts = pict->pts;
327 /* lifetime is not reached so wait for next frame first */
328 return 0;
329 }
330 }
331
332 /* lifetime reached so now convert X frames at once */
333 if (c->mc_frame_counter == c->mc_lifetime) {
334 req_size = 0;
335 /* any frames to encode? */
336 if (c->mc_lifetime) {
337 req_size = charset_size + c->mc_lifetime*(screen_size + colram_size);
338 if ((ret = ff_alloc_packet2(avctx, pkt, req_size)) < 0)
339 return ret;
340 buf = pkt->data;
341
342 /* calc optimal new charset + charmaps */
343 avpriv_init_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb, CHARSET_CHARS, 50, charmap, &c->randctx);
344 avpriv_do_elbg (meta, 32, 1000 * c->mc_lifetime, best_cb, CHARSET_CHARS, 50, charmap, &c->randctx);
345
346 /* create colorram map and a c64 readable charset */
347 render_charset(avctx, charset, colram);
348
349 /* copy charset to buf */
350 memcpy(buf, charset, charset_size);
351
352 /* advance pointers */
353 buf += charset_size;
354 }
355
356 /* write x frames to buf */
357 for (frame = 0; frame < c->mc_lifetime; frame++) {
358 /* copy charmap to buf. buf is uchar*, charmap is int*, so no memcpy here, sorry */
359 for (y = 0; y < b_height; y++) {
360 for (x = 0; x < b_width; x++) {
361 buf[y * b_width + x] = charmap[y * b_width + x];
362 }
363 }
364 /* advance pointers */
365 buf += screen_size;
366 req_size += screen_size;
367
368 /* compress and copy colram to buf */
369 if (c->mc_use_5col) {
370 a64_compress_colram(buf, charmap, colram);
371 /* advance pointers */
372 buf += colram_size;
373 req_size += colram_size;
374 }
375
376 /* advance to next charmap */
377 charmap += 1000;
378 }
379
380 AV_WB32(avctx->extradata + 4, c->mc_frame_counter);
381 AV_WB32(avctx->extradata + 8, charset_size);
382 AV_WB32(avctx->extradata + 12, screen_size + colram_size);
383
384 /* reset counter */
385 c->mc_frame_counter = 0;
386
387 pkt->pts = pkt->dts = c->next_pts;
388 c->next_pts = AV_NOPTS_VALUE;
389
390 pkt->size = req_size;
391 pkt->flags |= AV_PKT_FLAG_KEY;
392 *got_packet = !!req_size;
393 }
394 return 0;
395}
396
397#if CONFIG_A64MULTI_ENCODER
398AVCodec ff_a64multi_encoder = {
399 .name = "a64multi",
400 .long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64"),
401 .type = AVMEDIA_TYPE_VIDEO,
402 .id = AV_CODEC_ID_A64_MULTI,
403 .priv_data_size = sizeof(A64Context),
404 .init = a64multi_encode_init,
405 .encode2 = a64multi_encode_frame,
406 .close = a64multi_close_encoder,
407 .pix_fmts = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE},
408 .capabilities = CODEC_CAP_DELAY,
409};
410#endif
411#if CONFIG_A64MULTI5_ENCODER
412AVCodec ff_a64multi5_encoder = {
413 .name = "a64multi5",
414 .long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64, extended with 5th color (colram)"),
415 .type = AVMEDIA_TYPE_VIDEO,
416 .id = AV_CODEC_ID_A64_MULTI5,
417 .priv_data_size = sizeof(A64Context),
418 .init = a64multi_encode_init,
419 .encode2 = a64multi_encode_frame,
420 .close = a64multi_close_encoder,
421 .pix_fmts = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE},
422 .capabilities = CODEC_CAP_DELAY,
423};
424#endif