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 Libav.
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.
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.
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
25 #include "libavutil/imgutils.h"
28 #include "dnxhddata.h"
32 typedef struct DNXHDContext {
33 AVCodecContext *avctx;
35 int cid; ///< compression id
36 unsigned int width, height;
37 unsigned int mb_width, mb_height;
38 uint32_t mb_scan_index[68]; /* max for 1080p */
39 int cur_field; ///< current interlaced field
40 VLC ac_vlc, dc_vlc, run_vlc;
43 DECLARE_ALIGNED(16, int16_t, blocks)[8][64];
45 const CIDEntry *cid_table;
46 int bit_depth; // 8, 10 or 0 if not initialized at all.
47 void (*decode_dct_block)(struct DNXHDContext *ctx, int16_t *block,
51 #define DNXHD_VLC_BITS 9
52 #define DNXHD_DC_VLC_BITS 7
54 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block, int n, int qscale);
55 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block, int n, int qscale);
57 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
59 DNXHDContext *ctx = avctx->priv_data;
65 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
67 if (cid != ctx->cid) {
70 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
71 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
74 ctx->cid_table = &ff_dnxhd_cid_table[index];
76 ff_free_vlc(&ctx->ac_vlc);
77 ff_free_vlc(&ctx->dc_vlc);
78 ff_free_vlc(&ctx->run_vlc);
80 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
81 ctx->cid_table->ac_bits, 1, 1,
82 ctx->cid_table->ac_codes, 2, 2, 0);
83 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->bit_depth + 4,
84 ctx->cid_table->dc_bits, 1, 1,
85 ctx->cid_table->dc_codes, 1, 1, 0);
86 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
87 ctx->cid_table->run_bits, 1, 1,
88 ctx->cid_table->run_codes, 2, 2, 0);
90 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
96 static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
97 const uint8_t *buf, int buf_size, int first_field)
99 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
102 if (buf_size < 0x280)
105 if (memcmp(buf, header_prefix, 5)) {
106 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
109 if (buf[5] & 2) { /* interlaced */
110 ctx->cur_field = buf[5] & 1;
111 frame->interlaced_frame = 1;
112 frame->top_field_first = first_field ^ ctx->cur_field;
113 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
116 ctx->height = AV_RB16(buf + 0x18);
117 ctx->width = AV_RB16(buf + 0x1a);
119 av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
121 if (buf[0x21] & 0x40) {
122 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
123 ctx->avctx->bits_per_raw_sample = 10;
124 if (ctx->bit_depth != 10) {
125 ff_dsputil_init(&ctx->dsp, ctx->avctx);
127 ctx->decode_dct_block = dnxhd_decode_dct_block_10;
130 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
131 ctx->avctx->bits_per_raw_sample = 8;
132 if (ctx->bit_depth != 8) {
133 ff_dsputil_init(&ctx->dsp, ctx->avctx);
135 ctx->decode_dct_block = dnxhd_decode_dct_block_8;
139 cid = AV_RB32(buf + 0x28);
140 av_dlog(ctx->avctx, "compression id %d\n", cid);
142 if (dnxhd_init_vlc(ctx, cid) < 0)
145 if (buf_size < ctx->cid_table->coding_unit_size) {
146 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
150 ctx->mb_width = ctx->width>>4;
151 ctx->mb_height = buf[0x16d];
153 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
155 if ((ctx->height+15)>>4 == ctx->mb_height && frame->interlaced_frame)
158 if (ctx->mb_height > 68 ||
159 (ctx->mb_height << frame->interlaced_frame) > (ctx->height+15)>>4) {
160 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
164 for (i = 0; i < ctx->mb_height; i++) {
165 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
166 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
167 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
168 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
176 static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
177 int16_t *block, int n,
183 int i, j, index1, index2, len;
184 int level, component, sign;
185 const uint8_t *weight_matrix;
186 OPEN_READER(bs, &ctx->gb);
189 component = 1 + (n&1);
190 weight_matrix = ctx->cid_table->chroma_weight;
193 weight_matrix = ctx->cid_table->luma_weight;
196 UPDATE_CACHE(bs, &ctx->gb);
197 GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
199 level = GET_CACHE(bs, &ctx->gb);
200 LAST_SKIP_BITS(bs, &ctx->gb, len);
202 level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
203 ctx->last_dc[component] += level;
205 block[0] = ctx->last_dc[component];
208 UPDATE_CACHE(bs, &ctx->gb);
209 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
211 level = ctx->cid_table->ac_level[index1];
212 if (!level) /* EOB */
215 sign = SHOW_SBITS(bs, &ctx->gb, 1);
216 SKIP_BITS(bs, &ctx->gb, 1);
218 if (ctx->cid_table->ac_index_flag[index1]) {
219 level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 6;
220 SKIP_BITS(bs, &ctx->gb, index_bits);
223 if (ctx->cid_table->ac_run_flag[index1]) {
224 UPDATE_CACHE(bs, &ctx->gb);
225 GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
227 i += ctx->cid_table->run[index2];
231 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
235 j = ctx->scantable.permutated[i];
236 level = (2*level+1) * qscale * weight_matrix[i];
237 if (level_bias < 32 || weight_matrix[i] != level_bias)
239 level >>= level_shift;
241 block[j] = (level^sign) - sign;
244 CLOSE_READER(bs, &ctx->gb);
247 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,
250 dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
253 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,
256 dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
259 static int dnxhd_decode_macroblock(DNXHDContext *ctx, AVFrame *frame, int x, int y)
261 int shift1 = ctx->bit_depth == 10;
262 int dct_linesize_luma = frame->linesize[0];
263 int dct_linesize_chroma = frame->linesize[1];
264 uint8_t *dest_y, *dest_u, *dest_v;
265 int dct_y_offset, dct_x_offset;
268 qscale = get_bits(&ctx->gb, 11);
269 skip_bits1(&ctx->gb);
271 for (i = 0; i < 8; i++) {
272 ctx->dsp.clear_block(ctx->blocks[i]);
273 ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
276 if (frame->interlaced_frame) {
277 dct_linesize_luma <<= 1;
278 dct_linesize_chroma <<= 1;
281 dest_y = frame->data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
282 dest_u = frame->data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
283 dest_v = frame->data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
285 if (ctx->cur_field) {
286 dest_y += frame->linesize[0];
287 dest_u += frame->linesize[1];
288 dest_v += frame->linesize[2];
291 dct_y_offset = dct_linesize_luma << 3;
292 dct_x_offset = 8 << shift1;
293 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
294 ctx->dsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
295 ctx->dsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
296 ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
298 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
299 dct_y_offset = dct_linesize_chroma << 3;
300 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
301 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
302 ctx->dsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
303 ctx->dsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
309 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, AVFrame *frame,
310 const uint8_t *buf, int buf_size)
313 for (y = 0; y < ctx->mb_height; y++) {
316 ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
317 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
318 for (x = 0; x < ctx->mb_width; x++) {
320 dnxhd_decode_macroblock(ctx, frame, x, y);
321 //STOP_TIMER("decode macroblock");
327 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
330 const uint8_t *buf = avpkt->data;
331 int buf_size = avpkt->size;
332 DNXHDContext *ctx = avctx->priv_data;
333 AVFrame *picture = data;
337 av_dlog(avctx, "frame size %d\n", buf_size);
340 if (dnxhd_decode_header(ctx, picture, buf, buf_size, first_field) < 0)
343 if ((avctx->width || avctx->height) &&
344 (ctx->width != avctx->width || ctx->height != avctx->height)) {
345 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
346 avctx->width, avctx->height, ctx->width, ctx->height);
350 if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
352 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
355 if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) {
356 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
359 picture->pict_type = AV_PICTURE_TYPE_I;
360 picture->key_frame = 1;
363 dnxhd_decode_macroblocks(ctx, picture, buf + 0x280, buf_size - 0x280);
365 if (first_field && picture->interlaced_frame) {
366 buf += ctx->cid_table->coding_unit_size;
367 buf_size -= ctx->cid_table->coding_unit_size;
369 goto decode_coding_unit;
376 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
378 DNXHDContext *ctx = avctx->priv_data;
380 ff_free_vlc(&ctx->ac_vlc);
381 ff_free_vlc(&ctx->dc_vlc);
382 ff_free_vlc(&ctx->run_vlc);
386 AVCodec ff_dnxhd_decoder = {
388 .type = AVMEDIA_TYPE_VIDEO,
389 .id = AV_CODEC_ID_DNXHD,
390 .priv_data_size = sizeof(DNXHDContext),
391 .init = dnxhd_decode_init,
392 .close = dnxhd_decode_close,
393 .decode = dnxhd_decode_frame,
394 .capabilities = CODEC_CAP_DR1,
395 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),