e71409b33ffa0a30db7dced43341e973c6b491e5
[libav.git] / libavcodec / dnxhddec.c
1 /*
2 * VC3/DNxHD decoder.
3 * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
4 * Copyright (c) 2011 MirriAd Ltd
5 *
6 * 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.com>
7 *
8 * This file is part of Libav.
9 *
10 * Libav is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * Libav is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with Libav; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 //#define TRACE
26 //#define DEBUG
27
28 #include "libavutil/imgutils.h"
29 #include "avcodec.h"
30 #include "get_bits.h"
31 #include "dnxhddata.h"
32 #include "dsputil.h"
33
34 typedef struct DNXHDContext {
35 AVCodecContext *avctx;
36 AVFrame picture;
37 GetBitContext gb;
38 int cid; ///< compression id
39 unsigned int width, height;
40 unsigned int mb_width, mb_height;
41 uint32_t mb_scan_index[68]; /* max for 1080p */
42 int cur_field; ///< current interlaced field
43 VLC ac_vlc, dc_vlc, run_vlc;
44 int last_dc[3];
45 DSPContext dsp;
46 DECLARE_ALIGNED(16, DCTELEM, blocks)[8][64];
47 ScanTable scantable;
48 const CIDEntry *cid_table;
49 int bit_depth; // 8, 10 or 0 if not initialized at all.
50 void (*decode_dct_block)(struct DNXHDContext *ctx, DCTELEM *block,
51 int n, int qscale);
52 } DNXHDContext;
53
54 #define DNXHD_VLC_BITS 9
55 #define DNXHD_DC_VLC_BITS 7
56
57 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);
58 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);
59
60 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
61 {
62 DNXHDContext *ctx = avctx->priv_data;
63
64 ctx->avctx = avctx;
65 avctx->coded_frame = &ctx->picture;
66 ctx->picture.type = AV_PICTURE_TYPE_I;
67 ctx->picture.key_frame = 1;
68 return 0;
69 }
70
71 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
72 {
73 if (cid != ctx->cid) {
74 int index;
75
76 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
77 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
78 return -1;
79 }
80 ctx->cid_table = &ff_dnxhd_cid_table[index];
81
82 ff_free_vlc(&ctx->ac_vlc);
83 ff_free_vlc(&ctx->dc_vlc);
84 ff_free_vlc(&ctx->run_vlc);
85
86 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
87 ctx->cid_table->ac_bits, 1, 1,
88 ctx->cid_table->ac_codes, 2, 2, 0);
89 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->bit_depth + 4,
90 ctx->cid_table->dc_bits, 1, 1,
91 ctx->cid_table->dc_codes, 1, 1, 0);
92 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
93 ctx->cid_table->run_bits, 1, 1,
94 ctx->cid_table->run_codes, 2, 2, 0);
95
96 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
97 ctx->cid = cid;
98 }
99 return 0;
100 }
101
102 static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
103 {
104 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
105 int i, cid;
106
107 if (buf_size < 0x280)
108 return -1;
109
110 if (memcmp(buf, header_prefix, 5)) {
111 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
112 return -1;
113 }
114 if (buf[5] & 2) { /* interlaced */
115 ctx->cur_field = buf[5] & 1;
116 ctx->picture.interlaced_frame = 1;
117 ctx->picture.top_field_first = first_field ^ ctx->cur_field;
118 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
119 }
120
121 ctx->height = AV_RB16(buf + 0x18);
122 ctx->width = AV_RB16(buf + 0x1a);
123
124 av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
125
126 if (buf[0x21] & 0x40) {
127 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
128 ctx->avctx->bits_per_raw_sample = 10;
129 if (ctx->bit_depth != 10) {
130 ff_dsputil_init(&ctx->dsp, ctx->avctx);
131 ctx->bit_depth = 10;
132 ctx->decode_dct_block = dnxhd_decode_dct_block_10;
133 }
134 } else {
135 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
136 ctx->avctx->bits_per_raw_sample = 8;
137 if (ctx->bit_depth != 8) {
138 ff_dsputil_init(&ctx->dsp, ctx->avctx);
139 ctx->bit_depth = 8;
140 ctx->decode_dct_block = dnxhd_decode_dct_block_8;
141 }
142 }
143
144 cid = AV_RB32(buf + 0x28);
145 av_dlog(ctx->avctx, "compression id %d\n", cid);
146
147 if (dnxhd_init_vlc(ctx, cid) < 0)
148 return -1;
149
150 if (buf_size < ctx->cid_table->coding_unit_size) {
151 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
152 return -1;
153 }
154
155 ctx->mb_width = ctx->width>>4;
156 ctx->mb_height = buf[0x16d];
157
158 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
159
160 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame)
161 ctx->height <<= 1;
162
163 if (ctx->mb_height > 68 ||
164 (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) {
165 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
166 return -1;
167 }
168
169 for (i = 0; i < ctx->mb_height; i++) {
170 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
171 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
172 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
173 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
174 return -1;
175 }
176 }
177
178 return 0;
179 }
180
181 static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
182 DCTELEM *block, int n,
183 int qscale,
184 int index_bits,
185 int level_bias,
186 int level_shift)
187 {
188 int i, j, index1, index2, len;
189 int level, component, sign;
190 const uint8_t *weight_matrix;
191 OPEN_READER(bs, &ctx->gb);
192
193 if (n&2) {
194 component = 1 + (n&1);
195 weight_matrix = ctx->cid_table->chroma_weight;
196 } else {
197 component = 0;
198 weight_matrix = ctx->cid_table->luma_weight;
199 }
200
201 UPDATE_CACHE(bs, &ctx->gb);
202 GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
203 if (len) {
204 level = GET_CACHE(bs, &ctx->gb);
205 LAST_SKIP_BITS(bs, &ctx->gb, len);
206 sign = ~level >> 31;
207 level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
208 ctx->last_dc[component] += level;
209 }
210 block[0] = ctx->last_dc[component];
211
212 for (i = 1; ; i++) {
213 UPDATE_CACHE(bs, &ctx->gb);
214 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
215 DNXHD_VLC_BITS, 2);
216 level = ctx->cid_table->ac_level[index1];
217 if (!level) /* EOB */
218 break;
219
220 sign = SHOW_SBITS(bs, &ctx->gb, 1);
221 SKIP_BITS(bs, &ctx->gb, 1);
222
223 if (ctx->cid_table->ac_index_flag[index1]) {
224 level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 6;
225 SKIP_BITS(bs, &ctx->gb, index_bits);
226 }
227
228 if (ctx->cid_table->ac_run_flag[index1]) {
229 UPDATE_CACHE(bs, &ctx->gb);
230 GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
231 DNXHD_VLC_BITS, 2);
232 i += ctx->cid_table->run[index2];
233 }
234
235 if (i > 63) {
236 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
237 break;
238 }
239
240 j = ctx->scantable.permutated[i];
241 level = (2*level+1) * qscale * weight_matrix[i];
242 if (level_bias < 32 || weight_matrix[i] != level_bias)
243 level += level_bias;
244 level >>= level_shift;
245
246 block[j] = (level^sign) - sign;
247 }
248
249 CLOSE_READER(bs, &ctx->gb);
250 }
251
252 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block,
253 int n, int qscale)
254 {
255 dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
256 }
257
258 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block,
259 int n, int qscale)
260 {
261 dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
262 }
263
264 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
265 {
266 int shift1 = ctx->bit_depth == 10;
267 int dct_linesize_luma = ctx->picture.linesize[0];
268 int dct_linesize_chroma = ctx->picture.linesize[1];
269 uint8_t *dest_y, *dest_u, *dest_v;
270 int dct_y_offset, dct_x_offset;
271 int qscale, i;
272
273 qscale = get_bits(&ctx->gb, 11);
274 skip_bits1(&ctx->gb);
275
276 for (i = 0; i < 8; i++) {
277 ctx->dsp.clear_block(ctx->blocks[i]);
278 ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
279 }
280
281 if (ctx->picture.interlaced_frame) {
282 dct_linesize_luma <<= 1;
283 dct_linesize_chroma <<= 1;
284 }
285
286 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
287 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
288 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
289
290 if (ctx->cur_field) {
291 dest_y += ctx->picture.linesize[0];
292 dest_u += ctx->picture.linesize[1];
293 dest_v += ctx->picture.linesize[2];
294 }
295
296 dct_y_offset = dct_linesize_luma << 3;
297 dct_x_offset = 8 << shift1;
298 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
299 ctx->dsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
300 ctx->dsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
301 ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
302
303 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
304 dct_y_offset = dct_linesize_chroma << 3;
305 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
306 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
307 ctx->dsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
308 ctx->dsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
309 }
310
311 return 0;
312 }
313
314 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
315 {
316 int x, y;
317 for (y = 0; y < ctx->mb_height; y++) {
318 ctx->last_dc[0] =
319 ctx->last_dc[1] =
320 ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
321 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
322 for (x = 0; x < ctx->mb_width; x++) {
323 //START_TIMER;
324 dnxhd_decode_macroblock(ctx, x, y);
325 //STOP_TIMER("decode macroblock");
326 }
327 }
328 return 0;
329 }
330
331 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
332 AVPacket *avpkt)
333 {
334 const uint8_t *buf = avpkt->data;
335 int buf_size = avpkt->size;
336 DNXHDContext *ctx = avctx->priv_data;
337 AVFrame *picture = data;
338 int first_field = 1;
339
340 av_dlog(avctx, "frame size %d\n", buf_size);
341
342 decode_coding_unit:
343 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
344 return -1;
345
346 if ((avctx->width || avctx->height) &&
347 (ctx->width != avctx->width || ctx->height != avctx->height)) {
348 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
349 avctx->width, avctx->height, ctx->width, ctx->height);
350 first_field = 1;
351 }
352
353 if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
354 return -1;
355 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
356
357 if (first_field) {
358 if (ctx->picture.data[0])
359 avctx->release_buffer(avctx, &ctx->picture);
360 if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
361 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
362 return -1;
363 }
364 }
365
366 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
367
368 if (first_field && ctx->picture.interlaced_frame) {
369 buf += ctx->cid_table->coding_unit_size;
370 buf_size -= ctx->cid_table->coding_unit_size;
371 first_field = 0;
372 goto decode_coding_unit;
373 }
374
375 *picture = ctx->picture;
376 *data_size = sizeof(AVPicture);
377 return buf_size;
378 }
379
380 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
381 {
382 DNXHDContext *ctx = avctx->priv_data;
383
384 if (ctx->picture.data[0])
385 avctx->release_buffer(avctx, &ctx->picture);
386 ff_free_vlc(&ctx->ac_vlc);
387 ff_free_vlc(&ctx->dc_vlc);
388 ff_free_vlc(&ctx->run_vlc);
389 return 0;
390 }
391
392 AVCodec ff_dnxhd_decoder = {
393 .name = "dnxhd",
394 .type = AVMEDIA_TYPE_VIDEO,
395 .id = AV_CODEC_ID_DNXHD,
396 .priv_data_size = sizeof(DNXHDContext),
397 .init = dnxhd_decode_init,
398 .close = dnxhd_decode_close,
399 .decode = dnxhd_decode_frame,
400 .capabilities = CODEC_CAP_DR1,
401 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
402 };