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,
57 #define DNXHD_VLC_BITS 9
58 #define DNXHD_DC_VLC_BITS 7
60 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);
61 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);
63 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
65 DNXHDContext *ctx = avctx->priv_data;
68 avctx->coded_frame = &ctx->picture;
69 avcodec_get_frame_defaults(&ctx->picture);
70 ctx->picture.type = AV_PICTURE_TYPE_I;
71 ctx->picture.key_frame = 1;
75 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
77 if (cid != ctx->cid) {
80 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
81 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
84 ctx->cid_table = &ff_dnxhd_cid_table[index];
86 free_vlc(&ctx->ac_vlc);
87 free_vlc(&ctx->dc_vlc);
88 free_vlc(&ctx->run_vlc);
90 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
91 ctx->cid_table->ac_bits, 1, 1,
92 ctx->cid_table->ac_codes, 2, 2, 0);
93 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->bit_depth + 4,
94 ctx->cid_table->dc_bits, 1, 1,
95 ctx->cid_table->dc_codes, 1, 1, 0);
96 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
97 ctx->cid_table->run_bits, 1, 1,
98 ctx->cid_table->run_codes, 2, 2, 0);
100 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
106 static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
108 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
111 if (buf_size < 0x280)
114 if (memcmp(buf, header_prefix, 5)) {
115 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
118 if (buf[5] & 2) { /* interlaced */
119 ctx->cur_field = buf[5] & 1;
120 ctx->picture.interlaced_frame = 1;
121 ctx->picture.top_field_first = first_field ^ ctx->cur_field;
122 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
125 ctx->height = AV_RB16(buf + 0x18);
126 ctx->width = AV_RB16(buf + 0x1a);
128 av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
130 if (buf[0x21] & 0x40) {
131 ctx->avctx->pix_fmt = PIX_FMT_YUV422P10;
132 ctx->avctx->bits_per_raw_sample = 10;
133 if (ctx->bit_depth != 10) {
134 dsputil_init(&ctx->dsp, ctx->avctx);
136 ctx->decode_dct_block = dnxhd_decode_dct_block_10;
139 ctx->avctx->pix_fmt = PIX_FMT_YUV422P;
140 ctx->avctx->bits_per_raw_sample = 8;
141 if (ctx->bit_depth != 8) {
142 dsputil_init(&ctx->dsp, ctx->avctx);
144 ctx->decode_dct_block = dnxhd_decode_dct_block_8;
148 cid = AV_RB32(buf + 0x28);
149 av_dlog(ctx->avctx, "compression id %d\n", cid);
151 if (dnxhd_init_vlc(ctx, cid) < 0)
154 if (buf_size < ctx->cid_table->coding_unit_size) {
155 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
159 ctx->mb_width = ctx->width>>4;
160 ctx->mb_height = buf[0x16d];
162 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
164 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame)
167 if (ctx->mb_height > 68 ||
168 (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) {
169 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
173 for (i = 0; i < ctx->mb_height; i++) {
174 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
175 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
176 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
177 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
185 static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
186 DCTELEM *block, int n,
192 int i, j, index1, index2, len, flags;
193 int level, component, sign;
195 const uint8_t *weight_matrix;
196 const uint8_t *ac_level = ctx->cid_table->ac_level;
197 const uint8_t *ac_flags = ctx->cid_table->ac_flags;
198 const int eob_index = ctx->cid_table->eob_index;
199 OPEN_READER(bs, &ctx->gb);
202 component = 1 + (n&1);
203 scale = ctx->chroma_scale;
204 weight_matrix = ctx->cid_table->chroma_weight;
207 scale = ctx->luma_scale;
208 weight_matrix = ctx->cid_table->luma_weight;
211 UPDATE_CACHE(bs, &ctx->gb);
212 GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
214 level = GET_CACHE(bs, &ctx->gb);
215 LAST_SKIP_BITS(bs, &ctx->gb, len);
217 level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
218 ctx->last_dc[component] += level;
220 block[0] = ctx->last_dc[component];
221 //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
225 UPDATE_CACHE(bs, &ctx->gb);
226 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
229 while (index1 != eob_index) {
230 level = ac_level[index1];
231 flags = ac_flags[index1];
233 sign = SHOW_SBITS(bs, &ctx->gb, 1);
234 SKIP_BITS(bs, &ctx->gb, 1);
237 level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 7;
238 SKIP_BITS(bs, &ctx->gb, index_bits);
242 UPDATE_CACHE(bs, &ctx->gb);
243 GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
245 i += ctx->cid_table->run[index2];
249 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
253 j = ctx->scantable.permutated[i];
254 //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
255 //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weight %d\n", level, weight_matrix[i]);
257 if (level_bias < 32 || weight_matrix[i] != level_bias)
259 level >>= level_shift;
261 //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
262 block[j] = (level^sign) - sign;
264 UPDATE_CACHE(bs, &ctx->gb);
265 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
269 CLOSE_READER(bs, &ctx->gb);
272 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block,
275 dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
278 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block,
281 dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
284 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
286 int shift1 = ctx->bit_depth == 10;
287 int dct_linesize_luma = ctx->picture.linesize[0];
288 int dct_linesize_chroma = ctx->picture.linesize[1];
289 uint8_t *dest_y, *dest_u, *dest_v;
290 int dct_y_offset, dct_x_offset;
293 qscale = get_bits(&ctx->gb, 11);
294 skip_bits1(&ctx->gb);
295 //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
297 if (qscale != ctx->last_qscale) {
298 for (i = 0; i < 64; i++) {
299 ctx->luma_scale[i] = qscale * ctx->cid_table->luma_weight[i];
300 ctx->chroma_scale[i] = qscale * ctx->cid_table->chroma_weight[i];
302 ctx->last_qscale = qscale;
305 for (i = 0; i < 8; i++) {
306 ctx->dsp.clear_block(ctx->blocks[i]);
307 ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
310 if (ctx->picture.interlaced_frame) {
311 dct_linesize_luma <<= 1;
312 dct_linesize_chroma <<= 1;
315 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
316 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
317 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
319 if (ctx->cur_field) {
320 dest_y += ctx->picture.linesize[0];
321 dest_u += ctx->picture.linesize[1];
322 dest_v += ctx->picture.linesize[2];
325 dct_y_offset = dct_linesize_luma << 3;
326 dct_x_offset = 8 << shift1;
327 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
328 ctx->dsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
329 ctx->dsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
330 ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
332 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
333 dct_y_offset = dct_linesize_chroma << 3;
334 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
335 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
336 ctx->dsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
337 ctx->dsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
343 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
346 for (y = 0; y < ctx->mb_height; y++) {
349 ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
350 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
351 for (x = 0; x < ctx->mb_width; x++) {
353 dnxhd_decode_macroblock(ctx, x, y);
354 //STOP_TIMER("decode macroblock");
360 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
363 const uint8_t *buf = avpkt->data;
364 int buf_size = avpkt->size;
365 DNXHDContext *ctx = avctx->priv_data;
366 AVFrame *picture = data;
369 av_dlog(avctx, "frame size %d\n", buf_size);
372 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
375 if ((avctx->width || avctx->height) &&
376 (ctx->width != avctx->width || ctx->height != avctx->height)) {
377 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
378 avctx->width, avctx->height, ctx->width, ctx->height);
382 if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
384 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
387 if (ctx->picture.data[0])
388 avctx->release_buffer(avctx, &ctx->picture);
389 if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
390 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
395 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
397 if (first_field && ctx->picture.interlaced_frame) {
398 buf += ctx->cid_table->coding_unit_size;
399 buf_size -= ctx->cid_table->coding_unit_size;
401 goto decode_coding_unit;
404 *picture = ctx->picture;
405 *data_size = sizeof(AVPicture);
409 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
411 DNXHDContext *ctx = avctx->priv_data;
413 if (ctx->picture.data[0])
414 avctx->release_buffer(avctx, &ctx->picture);
415 free_vlc(&ctx->ac_vlc);
416 free_vlc(&ctx->dc_vlc);
417 free_vlc(&ctx->run_vlc);
421 AVCodec ff_dnxhd_decoder = {
423 .type = AVMEDIA_TYPE_VIDEO,
424 .id = CODEC_ID_DNXHD,
425 .priv_data_size = sizeof(DNXHDContext),
426 .init = dnxhd_decode_init,
427 .close = dnxhd_decode_close,
428 .decode = dnxhd_decode_frame,
429 .capabilities = CODEC_CAP_DR1,
430 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),