3 * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
4 * Copyright (c) 2011 MirriAd Ltd
6 * 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.com>
8 * This file is part of FFmpeg.
10 * FFmpeg 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.
15 * FFmpeg 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.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "libavutil/imgutils.h"
31 #include "dnxhddata.h"
34 typedef struct DNXHDContext {
35 AVCodecContext *avctx;
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;
46 DECLARE_ALIGNED(16, DCTELEM, blocks)[8][64];
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,
54 #define DNXHD_VLC_BITS 9
55 #define DNXHD_DC_VLC_BITS 7
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);
60 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
62 DNXHDContext *ctx = avctx->priv_data;
65 avctx->coded_frame = &ctx->picture;
66 avcodec_get_frame_defaults(&ctx->picture);
67 ctx->picture.type = AV_PICTURE_TYPE_I;
68 ctx->picture.key_frame = 1;
72 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
74 if (cid != ctx->cid) {
77 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
78 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
81 ctx->cid_table = &ff_dnxhd_cid_table[index];
83 free_vlc(&ctx->ac_vlc);
84 free_vlc(&ctx->dc_vlc);
85 free_vlc(&ctx->run_vlc);
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);
97 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
103 static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
105 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
108 if (buf_size < 0x280)
111 if (memcmp(buf, header_prefix, 5)) {
112 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
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);
122 ctx->height = AV_RB16(buf + 0x18);
123 ctx->width = AV_RB16(buf + 0x1a);
125 av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
127 if (buf[0x21] & 0x40) {
128 ctx->avctx->pix_fmt = PIX_FMT_YUV422P10;
129 ctx->avctx->bits_per_raw_sample = 10;
130 if (ctx->bit_depth != 10) {
131 dsputil_init(&ctx->dsp, ctx->avctx);
133 ctx->decode_dct_block = dnxhd_decode_dct_block_10;
136 ctx->avctx->pix_fmt = PIX_FMT_YUV422P;
137 ctx->avctx->bits_per_raw_sample = 8;
138 if (ctx->bit_depth != 8) {
139 dsputil_init(&ctx->dsp, ctx->avctx);
141 ctx->decode_dct_block = dnxhd_decode_dct_block_8;
145 cid = AV_RB32(buf + 0x28);
146 av_dlog(ctx->avctx, "compression id %d\n", cid);
148 if (dnxhd_init_vlc(ctx, cid) < 0)
151 if (buf_size < ctx->cid_table->coding_unit_size) {
152 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
156 ctx->mb_width = ctx->width>>4;
157 ctx->mb_height = buf[0x16d];
159 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
161 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame)
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);
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");
182 static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
183 DCTELEM *block, int n,
189 int i, j, index1, index2, len;
190 int level, component, sign;
191 const uint8_t *weight_matrix;
192 OPEN_READER(bs, &ctx->gb);
195 component = 1 + (n&1);
196 weight_matrix = ctx->cid_table->chroma_weight;
199 weight_matrix = ctx->cid_table->luma_weight;
202 UPDATE_CACHE(bs, &ctx->gb);
203 GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
205 level = GET_CACHE(bs, &ctx->gb);
206 LAST_SKIP_BITS(bs, &ctx->gb, len);
208 level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
209 ctx->last_dc[component] += level;
211 block[0] = ctx->last_dc[component];
212 //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
215 UPDATE_CACHE(bs, &ctx->gb);
216 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
218 //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index1);
219 level = ctx->cid_table->ac_level[index1];
220 if (!level) { /* EOB */
221 //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
225 sign = SHOW_SBITS(bs, &ctx->gb, 1);
226 SKIP_BITS(bs, &ctx->gb, 1);
228 if (ctx->cid_table->ac_index_flag[index1]) {
229 level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 6;
230 SKIP_BITS(bs, &ctx->gb, index_bits);
233 if (ctx->cid_table->ac_run_flag[index1]) {
234 UPDATE_CACHE(bs, &ctx->gb);
235 GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
237 i += ctx->cid_table->run[index2];
241 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
245 j = ctx->scantable.permutated[i];
246 //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
247 //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weight %d\n", level, weight_matrix[i]);
248 level = (2*level+1) * qscale * weight_matrix[i];
249 if (level_bias < 32 || weight_matrix[i] != level_bias)
251 level >>= level_shift;
253 //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
254 block[j] = (level^sign) - sign;
257 CLOSE_READER(bs, &ctx->gb);
260 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block,
263 dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
266 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block,
269 dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
272 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
274 int shift1 = ctx->bit_depth == 10;
275 int dct_linesize_luma = ctx->picture.linesize[0];
276 int dct_linesize_chroma = ctx->picture.linesize[1];
277 uint8_t *dest_y, *dest_u, *dest_v;
278 int dct_y_offset, dct_x_offset;
281 qscale = get_bits(&ctx->gb, 11);
282 skip_bits1(&ctx->gb);
283 //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
285 for (i = 0; i < 8; i++) {
286 ctx->dsp.clear_block(ctx->blocks[i]);
287 ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
290 if (ctx->picture.interlaced_frame) {
291 dct_linesize_luma <<= 1;
292 dct_linesize_chroma <<= 1;
295 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
296 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
297 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
299 if (ctx->cur_field) {
300 dest_y += ctx->picture.linesize[0];
301 dest_u += ctx->picture.linesize[1];
302 dest_v += ctx->picture.linesize[2];
305 dct_y_offset = dct_linesize_luma << 3;
306 dct_x_offset = 8 << shift1;
307 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
308 ctx->dsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
309 ctx->dsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
310 ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
312 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
313 dct_y_offset = dct_linesize_chroma << 3;
314 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
315 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
316 ctx->dsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
317 ctx->dsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
323 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
326 for (y = 0; y < ctx->mb_height; y++) {
329 ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
330 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
331 for (x = 0; x < ctx->mb_width; x++) {
333 dnxhd_decode_macroblock(ctx, x, y);
334 //STOP_TIMER("decode macroblock");
340 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
343 const uint8_t *buf = avpkt->data;
344 int buf_size = avpkt->size;
345 DNXHDContext *ctx = avctx->priv_data;
346 AVFrame *picture = data;
349 av_dlog(avctx, "frame size %d\n", buf_size);
352 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
355 if ((avctx->width || avctx->height) &&
356 (ctx->width != avctx->width || ctx->height != avctx->height)) {
357 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
358 avctx->width, avctx->height, ctx->width, ctx->height);
362 if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
364 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
367 if (ctx->picture.data[0])
368 avctx->release_buffer(avctx, &ctx->picture);
369 if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
370 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
375 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
377 if (first_field && ctx->picture.interlaced_frame) {
378 buf += ctx->cid_table->coding_unit_size;
379 buf_size -= ctx->cid_table->coding_unit_size;
381 goto decode_coding_unit;
384 *picture = ctx->picture;
385 *data_size = sizeof(AVPicture);
389 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
391 DNXHDContext *ctx = avctx->priv_data;
393 if (ctx->picture.data[0])
394 avctx->release_buffer(avctx, &ctx->picture);
395 free_vlc(&ctx->ac_vlc);
396 free_vlc(&ctx->dc_vlc);
397 free_vlc(&ctx->run_vlc);
401 AVCodec ff_dnxhd_decoder = {
403 .type = AVMEDIA_TYPE_VIDEO,
404 .id = CODEC_ID_DNXHD,
405 .priv_data_size = sizeof(DNXHDContext),
406 .init = dnxhd_decode_init,
407 .close = dnxhd_decode_close,
408 .decode = dnxhd_decode_frame,
409 .capabilities = CODEC_CAP_DR1,
410 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),