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"
26 #include "libavutil/timer.h"
29 #include "dnxhddata.h"
33 typedef struct DNXHDContext {
34 AVCodecContext *avctx;
36 int cid; ///< compression id
37 unsigned int width, height;
38 unsigned int mb_width, mb_height;
39 uint32_t mb_scan_index[68]; /* max for 1080p */
40 int cur_field; ///< current interlaced field
41 VLC ac_vlc, dc_vlc, run_vlc;
44 DECLARE_ALIGNED(16, int16_t, blocks)[8][64];
46 const CIDEntry *cid_table;
47 int bit_depth; // 8, 10 or 0 if not initialized at all.
48 void (*decode_dct_block)(struct DNXHDContext *ctx, int16_t *block,
52 #define DNXHD_VLC_BITS 9
53 #define DNXHD_DC_VLC_BITS 7
55 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block, int n, int qscale);
56 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block, int n, int qscale);
58 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
60 DNXHDContext *ctx = avctx->priv_data;
66 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
68 if (cid != ctx->cid) {
71 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
72 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
75 ctx->cid_table = &ff_dnxhd_cid_table[index];
77 ff_free_vlc(&ctx->ac_vlc);
78 ff_free_vlc(&ctx->dc_vlc);
79 ff_free_vlc(&ctx->run_vlc);
81 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
82 ctx->cid_table->ac_bits, 1, 1,
83 ctx->cid_table->ac_codes, 2, 2, 0);
84 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->bit_depth + 4,
85 ctx->cid_table->dc_bits, 1, 1,
86 ctx->cid_table->dc_codes, 1, 1, 0);
87 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
88 ctx->cid_table->run_bits, 1, 1,
89 ctx->cid_table->run_codes, 2, 2, 0);
91 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
97 static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
98 const uint8_t *buf, int buf_size, int first_field)
100 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
103 if (buf_size < 0x280)
106 if (memcmp(buf, header_prefix, 5)) {
107 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
110 if (buf[5] & 2) { /* interlaced */
111 ctx->cur_field = buf[5] & 1;
112 frame->interlaced_frame = 1;
113 frame->top_field_first = first_field ^ ctx->cur_field;
114 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
117 ctx->height = AV_RB16(buf + 0x18);
118 ctx->width = AV_RB16(buf + 0x1a);
120 av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
122 if (buf[0x21] & 0x40) {
123 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
124 ctx->avctx->bits_per_raw_sample = 10;
125 if (ctx->bit_depth != 10) {
126 ff_dsputil_init(&ctx->dsp, ctx->avctx);
128 ctx->decode_dct_block = dnxhd_decode_dct_block_10;
131 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
132 ctx->avctx->bits_per_raw_sample = 8;
133 if (ctx->bit_depth != 8) {
134 ff_dsputil_init(&ctx->dsp, ctx->avctx);
136 ctx->decode_dct_block = dnxhd_decode_dct_block_8;
140 cid = AV_RB32(buf + 0x28);
141 av_dlog(ctx->avctx, "compression id %d\n", cid);
143 if (dnxhd_init_vlc(ctx, cid) < 0)
146 if (buf_size < ctx->cid_table->coding_unit_size) {
147 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
151 ctx->mb_width = ctx->width>>4;
152 ctx->mb_height = buf[0x16d];
154 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
156 if ((ctx->height+15)>>4 == ctx->mb_height && frame->interlaced_frame)
159 if (ctx->mb_height > 68 ||
160 (ctx->mb_height << frame->interlaced_frame) > (ctx->height+15)>>4) {
161 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
165 for (i = 0; i < ctx->mb_height; i++) {
166 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
167 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
168 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
169 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
177 static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
178 int16_t *block, int n,
184 int i, j, index1, index2, len;
185 int level, component, sign;
186 const uint8_t *weight_matrix;
187 OPEN_READER(bs, &ctx->gb);
190 component = 1 + (n&1);
191 weight_matrix = ctx->cid_table->chroma_weight;
194 weight_matrix = ctx->cid_table->luma_weight;
197 UPDATE_CACHE(bs, &ctx->gb);
198 GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
200 level = GET_CACHE(bs, &ctx->gb);
201 LAST_SKIP_BITS(bs, &ctx->gb, len);
203 level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
204 ctx->last_dc[component] += level;
206 block[0] = ctx->last_dc[component];
209 UPDATE_CACHE(bs, &ctx->gb);
210 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
212 level = ctx->cid_table->ac_level[index1];
213 if (!level) /* EOB */
216 sign = SHOW_SBITS(bs, &ctx->gb, 1);
217 SKIP_BITS(bs, &ctx->gb, 1);
219 if (ctx->cid_table->ac_index_flag[index1]) {
220 level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 6;
221 SKIP_BITS(bs, &ctx->gb, index_bits);
224 if (ctx->cid_table->ac_run_flag[index1]) {
225 UPDATE_CACHE(bs, &ctx->gb);
226 GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
228 i += ctx->cid_table->run[index2];
232 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
236 j = ctx->scantable.permutated[i];
237 level = (2*level+1) * qscale * weight_matrix[i];
238 if (level_bias < 32 || weight_matrix[i] != level_bias)
240 level >>= level_shift;
242 block[j] = (level^sign) - sign;
245 CLOSE_READER(bs, &ctx->gb);
248 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,
251 dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
254 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,
257 dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
260 static int dnxhd_decode_macroblock(DNXHDContext *ctx, AVFrame *frame, int x, int y)
262 int shift1 = ctx->bit_depth == 10;
263 int dct_linesize_luma = frame->linesize[0];
264 int dct_linesize_chroma = frame->linesize[1];
265 uint8_t *dest_y, *dest_u, *dest_v;
266 int dct_y_offset, dct_x_offset;
269 qscale = get_bits(&ctx->gb, 11);
270 skip_bits1(&ctx->gb);
272 for (i = 0; i < 8; i++) {
273 ctx->dsp.clear_block(ctx->blocks[i]);
274 ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
277 if (frame->interlaced_frame) {
278 dct_linesize_luma <<= 1;
279 dct_linesize_chroma <<= 1;
282 dest_y = frame->data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
283 dest_u = frame->data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
284 dest_v = frame->data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
286 if (ctx->cur_field) {
287 dest_y += frame->linesize[0];
288 dest_u += frame->linesize[1];
289 dest_v += frame->linesize[2];
292 dct_y_offset = dct_linesize_luma << 3;
293 dct_x_offset = 8 << shift1;
294 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
295 ctx->dsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
296 ctx->dsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
297 ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
299 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
300 dct_y_offset = dct_linesize_chroma << 3;
301 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
302 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
303 ctx->dsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
304 ctx->dsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
310 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, AVFrame *frame,
311 const uint8_t *buf, int buf_size)
314 for (y = 0; y < ctx->mb_height; y++) {
317 ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
318 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
319 for (x = 0; x < ctx->mb_width; x++) {
321 dnxhd_decode_macroblock(ctx, frame, x, y);
322 //STOP_TIMER("decode macroblock");
328 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
331 const uint8_t *buf = avpkt->data;
332 int buf_size = avpkt->size;
333 DNXHDContext *ctx = avctx->priv_data;
334 AVFrame *picture = data;
338 av_dlog(avctx, "frame size %d\n", buf_size);
341 if (dnxhd_decode_header(ctx, picture, buf, buf_size, first_field) < 0)
344 if ((avctx->width || avctx->height) &&
345 (ctx->width != avctx->width || ctx->height != avctx->height)) {
346 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
347 avctx->width, avctx->height, ctx->width, ctx->height);
351 ret = ff_set_dimensions(avctx, ctx->width, ctx->height);
356 if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) {
357 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
360 picture->pict_type = AV_PICTURE_TYPE_I;
361 picture->key_frame = 1;
364 dnxhd_decode_macroblocks(ctx, picture, buf + 0x280, buf_size - 0x280);
366 if (first_field && picture->interlaced_frame) {
367 buf += ctx->cid_table->coding_unit_size;
368 buf_size -= ctx->cid_table->coding_unit_size;
370 goto decode_coding_unit;
377 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
379 DNXHDContext *ctx = avctx->priv_data;
381 ff_free_vlc(&ctx->ac_vlc);
382 ff_free_vlc(&ctx->dc_vlc);
383 ff_free_vlc(&ctx->run_vlc);
387 AVCodec ff_dnxhd_decoder = {
389 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
390 .type = AVMEDIA_TYPE_VIDEO,
391 .id = AV_CODEC_ID_DNXHD,
392 .priv_data_size = sizeof(DNXHDContext),
393 .init = dnxhd_decode_init,
394 .close = dnxhd_decode_close,
395 .decode = dnxhd_decode_frame,
396 .capabilities = CODEC_CAP_DR1,