3 * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "libavutil/imgutils.h"
28 #include "dnxhddata.h"
32 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, DCTELEM, blocks)[8][64];
45 const CIDEntry *cid_table;
48 #define DNXHD_VLC_BITS 9
49 #define DNXHD_DC_VLC_BITS 7
51 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
53 DNXHDContext *ctx = avctx->priv_data;
56 dsputil_init(&ctx->dsp, avctx);
57 avctx->coded_frame = &ctx->picture;
58 ctx->picture.type = FF_I_TYPE;
59 ctx->picture.key_frame = 1;
63 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
65 if (!ctx->cid_table) {
68 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
69 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
72 ctx->cid_table = &ff_dnxhd_cid_table[index];
73 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
74 ctx->cid_table->ac_bits, 1, 1,
75 ctx->cid_table->ac_codes, 2, 2, 0);
76 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->cid_table->bit_depth+4,
77 ctx->cid_table->dc_bits, 1, 1,
78 ctx->cid_table->dc_codes, 1, 1, 0);
79 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
80 ctx->cid_table->run_bits, 1, 1,
81 ctx->cid_table->run_codes, 2, 2, 0);
83 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
88 static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
90 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
96 if (memcmp(buf, header_prefix, 5)) {
97 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
100 if (buf[5] & 2) { /* interlaced */
101 ctx->cur_field = buf[5] & 1;
102 ctx->picture.interlaced_frame = 1;
103 ctx->picture.top_field_first = first_field ^ ctx->cur_field;
104 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
107 ctx->height = AV_RB16(buf + 0x18);
108 ctx->width = AV_RB16(buf + 0x1a);
110 av_dlog(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
112 if (buf[0x21] & 0x40) {
113 av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
117 ctx->cid = AV_RB32(buf + 0x28);
118 av_dlog(ctx->avctx, "compression id %d\n", ctx->cid);
120 if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
123 if (buf_size < ctx->cid_table->coding_unit_size) {
124 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
128 ctx->mb_width = ctx->width>>4;
129 ctx->mb_height = buf[0x16d];
131 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
133 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame)
136 if (ctx->mb_height > 68 ||
137 (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) {
138 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
142 for (i = 0; i < ctx->mb_height; i++) {
143 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
144 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
145 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
146 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
154 static int dnxhd_decode_dc(DNXHDContext *ctx)
158 len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
159 return len ? get_xbits(&ctx->gb, len) : 0;
162 static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
164 int i, j, index, index2;
165 int level, component, sign;
166 const uint8_t *weigth_matrix;
169 component = 1 + (n&1);
170 weigth_matrix = ctx->cid_table->chroma_weight;
173 weigth_matrix = ctx->cid_table->luma_weight;
176 ctx->last_dc[component] += dnxhd_decode_dc(ctx);
177 block[0] = ctx->last_dc[component];
178 //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
180 index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
181 //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index);
182 level = ctx->cid_table->ac_level[index];
183 if (!level) { /* EOB */
184 //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
187 sign = get_sbits(&ctx->gb, 1);
189 if (ctx->cid_table->ac_index_flag[index]) {
190 level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6;
193 if (ctx->cid_table->ac_run_flag[index]) {
194 index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
195 i += ctx->cid_table->run[index2];
199 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
203 j = ctx->scantable.permutated[i];
204 //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
205 //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]);
206 level = (2*level+1) * qscale * weigth_matrix[i];
207 if (ctx->cid_table->bit_depth == 10) {
208 if (weigth_matrix[i] != 8)
212 if (weigth_matrix[i] != 32)
216 //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
217 block[j] = (level^sign) - sign;
221 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
223 int dct_linesize_luma = ctx->picture.linesize[0];
224 int dct_linesize_chroma = ctx->picture.linesize[1];
225 uint8_t *dest_y, *dest_u, *dest_v;
229 qscale = get_bits(&ctx->gb, 11);
230 skip_bits1(&ctx->gb);
231 //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
233 for (i = 0; i < 8; i++) {
234 ctx->dsp.clear_block(ctx->blocks[i]);
235 dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
238 if (ctx->picture.interlaced_frame) {
239 dct_linesize_luma <<= 1;
240 dct_linesize_chroma <<= 1;
243 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << 4);
244 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3);
245 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3);
247 if (ctx->cur_field) {
248 dest_y += ctx->picture.linesize[0];
249 dest_u += ctx->picture.linesize[1];
250 dest_v += ctx->picture.linesize[2];
253 dct_offset = dct_linesize_luma << 3;
254 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
255 ctx->dsp.idct_put(dest_y + 8, dct_linesize_luma, ctx->blocks[1]);
256 ctx->dsp.idct_put(dest_y + dct_offset, dct_linesize_luma, ctx->blocks[4]);
257 ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]);
259 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
260 dct_offset = dct_linesize_chroma << 3;
261 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
262 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
263 ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]);
264 ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]);
270 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
273 for (y = 0; y < ctx->mb_height; y++) {
276 ctx->last_dc[2] = 1<<(ctx->cid_table->bit_depth+2); // for levels +2^(bitdepth-1)
277 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
278 for (x = 0; x < ctx->mb_width; x++) {
280 dnxhd_decode_macroblock(ctx, x, y);
281 //STOP_TIMER("decode macroblock");
287 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
290 const uint8_t *buf = avpkt->data;
291 int buf_size = avpkt->size;
292 DNXHDContext *ctx = avctx->priv_data;
293 AVFrame *picture = data;
296 av_dlog(avctx, "frame size %d\n", buf_size);
299 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
302 if ((avctx->width || avctx->height) &&
303 (ctx->width != avctx->width || ctx->height != avctx->height)) {
304 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
305 avctx->width, avctx->height, ctx->width, ctx->height);
309 avctx->pix_fmt = PIX_FMT_YUV422P;
310 if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
312 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
315 if (ctx->picture.data[0])
316 avctx->release_buffer(avctx, &ctx->picture);
317 if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
318 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
323 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
325 if (first_field && ctx->picture.interlaced_frame) {
326 buf += ctx->cid_table->coding_unit_size;
327 buf_size -= ctx->cid_table->coding_unit_size;
329 goto decode_coding_unit;
332 *picture = ctx->picture;
333 *data_size = sizeof(AVPicture);
337 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
339 DNXHDContext *ctx = avctx->priv_data;
341 if (ctx->picture.data[0])
342 avctx->release_buffer(avctx, &ctx->picture);
343 free_vlc(&ctx->ac_vlc);
344 free_vlc(&ctx->dc_vlc);
345 free_vlc(&ctx->run_vlc);
349 AVCodec ff_dnxhd_decoder = {
353 sizeof(DNXHDContext),
359 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),