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
25 #include "libavutil/imgutils.h"
26 #include "libavutil/timer.h"
29 #include "dnxhddata.h"
34 typedef struct DNXHDContext {
35 AVCodecContext *avctx;
37 int64_t cid; ///< compression id
38 unsigned int width, height;
39 unsigned int mb_width, mb_height;
40 uint32_t mb_scan_index[68]; /* max for 1080p */
41 int cur_field; ///< current interlaced field
42 VLC ac_vlc, dc_vlc, run_vlc;
45 DECLARE_ALIGNED(16, int16_t, blocks)[8][64];
47 const CIDEntry *cid_table;
48 int bit_depth; // 8, 10 or 0 if not initialized at all.
49 void (*decode_dct_block)(struct DNXHDContext *ctx, int16_t *block,
56 #define DNXHD_VLC_BITS 9
57 #define DNXHD_DC_VLC_BITS 7
59 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block, int n, int qscale);
60 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block, int n, int qscale);
62 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
64 DNXHDContext *ctx = avctx->priv_data;
71 static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid)
73 if (cid != ctx->cid) {
76 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
77 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
80 if (ff_dnxhd_cid_table[index].bit_depth != ctx->bit_depth) {
81 av_log(ctx->avctx, AV_LOG_ERROR, "bit depth mismatches %d %d\n", ff_dnxhd_cid_table[index].bit_depth, ctx->bit_depth);
82 return AVERROR_INVALIDDATA;
84 ctx->cid_table = &ff_dnxhd_cid_table[index];
86 ff_free_vlc(&ctx->ac_vlc);
87 ff_free_vlc(&ctx->dc_vlc);
88 ff_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, AVFrame *frame,
107 const uint8_t *buf, int buf_size, int first_field)
109 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
112 if (buf_size < 0x280)
115 if (memcmp(buf, header_prefix, 5)) {
116 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
119 if (buf[5] & 2) { /* interlaced */
120 ctx->cur_field = buf[5] & 1;
121 frame->interlaced_frame = 1;
122 frame->top_field_first = first_field ^ ctx->cur_field;
123 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
126 ctx->height = AV_RB16(buf + 0x18);
127 ctx->width = AV_RB16(buf + 0x1a);
129 av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
131 if (buf[0x21] & 0x40) {
132 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
133 ctx->avctx->bits_per_raw_sample = 10;
134 if (ctx->bit_depth != 10) {
135 ff_dsputil_init(&ctx->dsp, ctx->avctx);
137 ctx->decode_dct_block = dnxhd_decode_dct_block_10;
140 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
141 ctx->avctx->bits_per_raw_sample = 8;
142 if (ctx->bit_depth != 8) {
143 ff_dsputil_init(&ctx->dsp, ctx->avctx);
145 ctx->decode_dct_block = dnxhd_decode_dct_block_8;
149 cid = AV_RB32(buf + 0x28);
150 av_dlog(ctx->avctx, "compression id %d\n", cid);
152 if (dnxhd_init_vlc(ctx, cid) < 0)
155 if (buf_size < ctx->cid_table->coding_unit_size) {
156 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
160 ctx->mb_width = ctx->width>>4;
161 ctx->mb_height = buf[0x16d];
163 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
165 if ((ctx->height+15)>>4 == ctx->mb_height && frame->interlaced_frame)
168 if (ctx->mb_height > 68 ||
169 (ctx->mb_height << frame->interlaced_frame) > (ctx->height+15)>>4) {
170 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
174 for (i = 0; i < ctx->mb_height; i++) {
175 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
176 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
177 if (buf_size < ctx->mb_scan_index[i] + 0x280LL) {
178 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
186 static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
187 int16_t *block, int n,
193 int i, j, index1, index2, len, flags;
194 int level, component, sign;
196 const uint8_t *weight_matrix;
197 const uint8_t *ac_level = ctx->cid_table->ac_level;
198 const uint8_t *ac_flags = ctx->cid_table->ac_flags;
199 const int eob_index = ctx->cid_table->eob_index;
200 OPEN_READER(bs, &ctx->gb);
203 component = 1 + (n&1);
204 scale = ctx->chroma_scale;
205 weight_matrix = ctx->cid_table->chroma_weight;
208 scale = ctx->luma_scale;
209 weight_matrix = ctx->cid_table->luma_weight;
212 UPDATE_CACHE(bs, &ctx->gb);
213 GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
215 level = GET_CACHE(bs, &ctx->gb);
216 LAST_SKIP_BITS(bs, &ctx->gb, len);
218 level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
219 ctx->last_dc[component] += level;
221 block[0] = ctx->last_dc[component];
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];
255 if (level_bias < 32 || weight_matrix[i] != level_bias)
257 level >>= level_shift;
259 block[j] = (level^sign) - sign;
261 UPDATE_CACHE(bs, &ctx->gb);
262 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
266 CLOSE_READER(bs, &ctx->gb);
269 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,
272 dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
275 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,
278 dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
281 static int dnxhd_decode_macroblock(DNXHDContext *ctx, AVFrame *frame, int x, int y)
283 int shift1 = ctx->bit_depth == 10;
284 int dct_linesize_luma = frame->linesize[0];
285 int dct_linesize_chroma = frame->linesize[1];
286 uint8_t *dest_y, *dest_u, *dest_v;
287 int dct_y_offset, dct_x_offset;
290 qscale = get_bits(&ctx->gb, 11);
291 skip_bits1(&ctx->gb);
293 if (qscale != ctx->last_qscale) {
294 for (i = 0; i < 64; i++) {
295 ctx->luma_scale[i] = qscale * ctx->cid_table->luma_weight[i];
296 ctx->chroma_scale[i] = qscale * ctx->cid_table->chroma_weight[i];
298 ctx->last_qscale = qscale;
301 for (i = 0; i < 8; i++) {
302 ctx->dsp.clear_block(ctx->blocks[i]);
303 ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
306 if (frame->interlaced_frame) {
307 dct_linesize_luma <<= 1;
308 dct_linesize_chroma <<= 1;
311 dest_y = frame->data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
312 dest_u = frame->data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
313 dest_v = frame->data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
315 if (ctx->cur_field) {
316 dest_y += frame->linesize[0];
317 dest_u += frame->linesize[1];
318 dest_v += frame->linesize[2];
321 dct_y_offset = dct_linesize_luma << 3;
322 dct_x_offset = 8 << shift1;
323 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
324 ctx->dsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
325 ctx->dsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
326 ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
328 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
329 dct_y_offset = dct_linesize_chroma << 3;
330 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
331 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
332 ctx->dsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
333 ctx->dsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
339 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, AVFrame *frame,
340 const uint8_t *buf, int buf_size)
343 for (y = 0; y < ctx->mb_height; y++) {
346 ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
347 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
348 for (x = 0; x < ctx->mb_width; x++) {
350 dnxhd_decode_macroblock(ctx, frame, x, y);
351 //STOP_TIMER("decode macroblock");
357 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
360 const uint8_t *buf = avpkt->data;
361 int buf_size = avpkt->size;
362 DNXHDContext *ctx = avctx->priv_data;
363 ThreadFrame frame = { .f = data };
364 AVFrame *picture = data;
368 av_dlog(avctx, "frame size %d\n", buf_size);
371 if (dnxhd_decode_header(ctx, picture, buf, buf_size, first_field) < 0)
374 if ((avctx->width || avctx->height) &&
375 (ctx->width != avctx->width || ctx->height != avctx->height)) {
376 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
377 avctx->width, avctx->height, ctx->width, ctx->height);
381 ret = ff_set_dimensions(avctx, ctx->width, ctx->height);
386 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
388 picture->pict_type = AV_PICTURE_TYPE_I;
389 picture->key_frame = 1;
392 dnxhd_decode_macroblocks(ctx, picture, buf + 0x280, buf_size - 0x280);
394 if (first_field && picture->interlaced_frame) {
395 buf += ctx->cid_table->coding_unit_size;
396 buf_size -= ctx->cid_table->coding_unit_size;
398 goto decode_coding_unit;
405 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
407 DNXHDContext *ctx = avctx->priv_data;
409 ff_free_vlc(&ctx->ac_vlc);
410 ff_free_vlc(&ctx->dc_vlc);
411 ff_free_vlc(&ctx->run_vlc);
415 AVCodec ff_dnxhd_decoder = {
417 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
418 .type = AVMEDIA_TYPE_VIDEO,
419 .id = AV_CODEC_ID_DNXHD,
420 .priv_data_size = sizeof(DNXHDContext),
421 .init = dnxhd_decode_init,
422 .close = dnxhd_decode_close,
423 .decode = dnxhd_decode_frame,
424 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,