lavc: add a wrapper for AVCodecContext.get_buffer().
[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 #include "internal.h"
34
35 typedef struct DNXHDContext {
36 AVCodecContext *avctx;
37 AVFrame picture;
38 GetBitContext gb;
39 int cid; ///< compression id
40 unsigned int width, height;
41 unsigned int mb_width, mb_height;
42 uint32_t mb_scan_index[68]; /* max for 1080p */
43 int cur_field; ///< current interlaced field
44 VLC ac_vlc, dc_vlc, run_vlc;
45 int last_dc[3];
46 DSPContext dsp;
47 DECLARE_ALIGNED(16, DCTELEM, blocks)[8][64];
48 ScanTable scantable;
49 const CIDEntry *cid_table;
50 int bit_depth; // 8, 10 or 0 if not initialized at all.
51 void (*decode_dct_block)(struct DNXHDContext *ctx, DCTELEM *block,
52 int n, int qscale);
53 } DNXHDContext;
54
55 #define DNXHD_VLC_BITS 9
56 #define DNXHD_DC_VLC_BITS 7
57
58 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);
59 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);
60
61 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
62 {
63 DNXHDContext *ctx = avctx->priv_data;
64
65 ctx->avctx = avctx;
66 avctx->coded_frame = &ctx->picture;
67 ctx->picture.type = AV_PICTURE_TYPE_I;
68 ctx->picture.key_frame = 1;
69 return 0;
70 }
71
72 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
73 {
74 if (cid != ctx->cid) {
75 int index;
76
77 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
78 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
79 return -1;
80 }
81 ctx->cid_table = &ff_dnxhd_cid_table[index];
82
83 ff_free_vlc(&ctx->ac_vlc);
84 ff_free_vlc(&ctx->dc_vlc);
85 ff_free_vlc(&ctx->run_vlc);
86
87 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
88 ctx->cid_table->ac_bits, 1, 1,
89 ctx->cid_table->ac_codes, 2, 2, 0);
90 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->bit_depth + 4,
91 ctx->cid_table->dc_bits, 1, 1,
92 ctx->cid_table->dc_codes, 1, 1, 0);
93 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
94 ctx->cid_table->run_bits, 1, 1,
95 ctx->cid_table->run_codes, 2, 2, 0);
96
97 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
98 ctx->cid = cid;
99 }
100 return 0;
101 }
102
103 static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
104 {
105 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
106 int i, cid;
107
108 if (buf_size < 0x280)
109 return -1;
110
111 if (memcmp(buf, header_prefix, 5)) {
112 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
113 return -1;
114 }
115 if (buf[5] & 2) { /* interlaced */
116 ctx->cur_field = buf[5] & 1;
117 ctx->picture.interlaced_frame = 1;
118 ctx->picture.top_field_first = first_field ^ ctx->cur_field;
119 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
120 }
121
122 ctx->height = AV_RB16(buf + 0x18);
123 ctx->width = AV_RB16(buf + 0x1a);
124
125 av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
126
127 if (buf[0x21] & 0x40) {
128 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
129 ctx->avctx->bits_per_raw_sample = 10;
130 if (ctx->bit_depth != 10) {
131 ff_dsputil_init(&ctx->dsp, ctx->avctx);
132 ctx->bit_depth = 10;
133 ctx->decode_dct_block = dnxhd_decode_dct_block_10;
134 }
135 } else {
136 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
137 ctx->avctx->bits_per_raw_sample = 8;
138 if (ctx->bit_depth != 8) {
139 ff_dsputil_init(&ctx->dsp, ctx->avctx);
140 ctx->bit_depth = 8;
141 ctx->decode_dct_block = dnxhd_decode_dct_block_8;
142 }
143 }
144
145 cid = AV_RB32(buf + 0x28);
146 av_dlog(ctx->avctx, "compression id %d\n", cid);
147
148 if (dnxhd_init_vlc(ctx, cid) < 0)
149 return -1;
150
151 if (buf_size < ctx->cid_table->coding_unit_size) {
152 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
153 return -1;
154 }
155
156 ctx->mb_width = ctx->width>>4;
157 ctx->mb_height = buf[0x16d];
158
159 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
160
161 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame)
162 ctx->height <<= 1;
163
164 if (ctx->mb_height > 68 ||
165 (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) {
166 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
167 return -1;
168 }
169
170 for (i = 0; i < ctx->mb_height; i++) {
171 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
172 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
173 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
174 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
175 return -1;
176 }
177 }
178
179 return 0;
180 }
181
182 static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
183 DCTELEM *block, int n,
184 int qscale,
185 int index_bits,
186 int level_bias,
187 int level_shift)
188 {
189 int i, j, index1, index2, len;
190 int level, component, sign;
191 const uint8_t *weight_matrix;
192 OPEN_READER(bs, &ctx->gb);
193
194 if (n&2) {
195 component = 1 + (n&1);
196 weight_matrix = ctx->cid_table->chroma_weight;
197 } else {
198 component = 0;
199 weight_matrix = ctx->cid_table->luma_weight;
200 }
201
202 UPDATE_CACHE(bs, &ctx->gb);
203 GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
204 if (len) {
205 level = GET_CACHE(bs, &ctx->gb);
206 LAST_SKIP_BITS(bs, &ctx->gb, len);
207 sign = ~level >> 31;
208 level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
209 ctx->last_dc[component] += level;
210 }
211 block[0] = ctx->last_dc[component];
212
213 for (i = 1; ; i++) {
214 UPDATE_CACHE(bs, &ctx->gb);
215 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
216 DNXHD_VLC_BITS, 2);
217 level = ctx->cid_table->ac_level[index1];
218 if (!level) /* EOB */
219 break;
220
221 sign = SHOW_SBITS(bs, &ctx->gb, 1);
222 SKIP_BITS(bs, &ctx->gb, 1);
223
224 if (ctx->cid_table->ac_index_flag[index1]) {
225 level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 6;
226 SKIP_BITS(bs, &ctx->gb, index_bits);
227 }
228
229 if (ctx->cid_table->ac_run_flag[index1]) {
230 UPDATE_CACHE(bs, &ctx->gb);
231 GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
232 DNXHD_VLC_BITS, 2);
233 i += ctx->cid_table->run[index2];
234 }
235
236 if (i > 63) {
237 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
238 break;
239 }
240
241 j = ctx->scantable.permutated[i];
242 level = (2*level+1) * qscale * weight_matrix[i];
243 if (level_bias < 32 || weight_matrix[i] != level_bias)
244 level += level_bias;
245 level >>= level_shift;
246
247 block[j] = (level^sign) - sign;
248 }
249
250 CLOSE_READER(bs, &ctx->gb);
251 }
252
253 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block,
254 int n, int qscale)
255 {
256 dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
257 }
258
259 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block,
260 int n, int qscale)
261 {
262 dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
263 }
264
265 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
266 {
267 int shift1 = ctx->bit_depth == 10;
268 int dct_linesize_luma = ctx->picture.linesize[0];
269 int dct_linesize_chroma = ctx->picture.linesize[1];
270 uint8_t *dest_y, *dest_u, *dest_v;
271 int dct_y_offset, dct_x_offset;
272 int qscale, i;
273
274 qscale = get_bits(&ctx->gb, 11);
275 skip_bits1(&ctx->gb);
276
277 for (i = 0; i < 8; i++) {
278 ctx->dsp.clear_block(ctx->blocks[i]);
279 ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
280 }
281
282 if (ctx->picture.interlaced_frame) {
283 dct_linesize_luma <<= 1;
284 dct_linesize_chroma <<= 1;
285 }
286
287 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
288 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
289 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
290
291 if (ctx->cur_field) {
292 dest_y += ctx->picture.linesize[0];
293 dest_u += ctx->picture.linesize[1];
294 dest_v += ctx->picture.linesize[2];
295 }
296
297 dct_y_offset = dct_linesize_luma << 3;
298 dct_x_offset = 8 << shift1;
299 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
300 ctx->dsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
301 ctx->dsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
302 ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
303
304 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
305 dct_y_offset = dct_linesize_chroma << 3;
306 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
307 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
308 ctx->dsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
309 ctx->dsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
310 }
311
312 return 0;
313 }
314
315 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
316 {
317 int x, y;
318 for (y = 0; y < ctx->mb_height; y++) {
319 ctx->last_dc[0] =
320 ctx->last_dc[1] =
321 ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
322 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
323 for (x = 0; x < ctx->mb_width; x++) {
324 //START_TIMER;
325 dnxhd_decode_macroblock(ctx, x, y);
326 //STOP_TIMER("decode macroblock");
327 }
328 }
329 return 0;
330 }
331
332 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
333 AVPacket *avpkt)
334 {
335 const uint8_t *buf = avpkt->data;
336 int buf_size = avpkt->size;
337 DNXHDContext *ctx = avctx->priv_data;
338 AVFrame *picture = data;
339 int first_field = 1;
340
341 av_dlog(avctx, "frame size %d\n", buf_size);
342
343 decode_coding_unit:
344 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
345 return -1;
346
347 if ((avctx->width || avctx->height) &&
348 (ctx->width != avctx->width || ctx->height != avctx->height)) {
349 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
350 avctx->width, avctx->height, ctx->width, ctx->height);
351 first_field = 1;
352 }
353
354 if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
355 return -1;
356 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
357
358 if (first_field) {
359 if (ctx->picture.data[0])
360 avctx->release_buffer(avctx, &ctx->picture);
361 if (ff_get_buffer(avctx, &ctx->picture) < 0) {
362 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
363 return -1;
364 }
365 }
366
367 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
368
369 if (first_field && ctx->picture.interlaced_frame) {
370 buf += ctx->cid_table->coding_unit_size;
371 buf_size -= ctx->cid_table->coding_unit_size;
372 first_field = 0;
373 goto decode_coding_unit;
374 }
375
376 *picture = ctx->picture;
377 *data_size = sizeof(AVPicture);
378 return buf_size;
379 }
380
381 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
382 {
383 DNXHDContext *ctx = avctx->priv_data;
384
385 if (ctx->picture.data[0])
386 avctx->release_buffer(avctx, &ctx->picture);
387 ff_free_vlc(&ctx->ac_vlc);
388 ff_free_vlc(&ctx->dc_vlc);
389 ff_free_vlc(&ctx->run_vlc);
390 return 0;
391 }
392
393 AVCodec ff_dnxhd_decoder = {
394 .name = "dnxhd",
395 .type = AVMEDIA_TYPE_VIDEO,
396 .id = AV_CODEC_ID_DNXHD,
397 .priv_data_size = sizeof(DNXHDContext),
398 .init = dnxhd_decode_init,
399 .close = dnxhd_decode_close,
400 .decode = dnxhd_decode_frame,
401 .capabilities = CODEC_CAP_DR1,
402 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
403 };