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 avcodec_get_frame_defaults(&ctx->picture);
59 ctx->picture.type = AV_PICTURE_TYPE_I;
60 ctx->picture.key_frame = 1;
64 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
66 if (!ctx->cid_table) {
69 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
70 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
73 ctx->cid_table = &ff_dnxhd_cid_table[index];
74 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
75 ctx->cid_table->ac_bits, 1, 1,
76 ctx->cid_table->ac_codes, 2, 2, 0);
77 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->cid_table->bit_depth+4,
78 ctx->cid_table->dc_bits, 1, 1,
79 ctx->cid_table->dc_codes, 1, 1, 0);
80 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
81 ctx->cid_table->run_bits, 1, 1,
82 ctx->cid_table->run_codes, 2, 2, 0);
84 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
89 static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
91 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
97 if (memcmp(buf, header_prefix, 5)) {
98 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
101 if (buf[5] & 2) { /* interlaced */
102 ctx->cur_field = buf[5] & 1;
103 ctx->picture.interlaced_frame = 1;
104 ctx->picture.top_field_first = first_field ^ ctx->cur_field;
105 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
108 ctx->height = AV_RB16(buf + 0x18);
109 ctx->width = AV_RB16(buf + 0x1a);
111 av_dlog(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
113 if (buf[0x21] & 0x40) {
114 av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
118 ctx->cid = AV_RB32(buf + 0x28);
119 av_dlog(ctx->avctx, "compression id %d\n", ctx->cid);
121 if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
124 if (buf_size < ctx->cid_table->coding_unit_size) {
125 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
129 ctx->mb_width = ctx->width>>4;
130 ctx->mb_height = buf[0x16d];
132 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
134 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame)
137 if (ctx->mb_height > 68 ||
138 (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) {
139 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
143 for (i = 0; i < ctx->mb_height; i++) {
144 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
145 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
146 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
147 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
155 static int dnxhd_decode_dc(DNXHDContext *ctx)
159 len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
160 return len ? get_xbits(&ctx->gb, len) : 0;
163 static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
165 int i, j, index, index2;
166 int level, component, sign;
167 const uint8_t *weigth_matrix;
170 component = 1 + (n&1);
171 weigth_matrix = ctx->cid_table->chroma_weight;
174 weigth_matrix = ctx->cid_table->luma_weight;
177 ctx->last_dc[component] += dnxhd_decode_dc(ctx);
178 block[0] = ctx->last_dc[component];
179 //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
181 index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
182 //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index);
183 level = ctx->cid_table->ac_level[index];
184 if (!level) { /* EOB */
185 //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
188 sign = get_sbits(&ctx->gb, 1);
190 if (ctx->cid_table->ac_index_flag[index]) {
191 level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6;
194 if (ctx->cid_table->ac_run_flag[index]) {
195 index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
196 i += ctx->cid_table->run[index2];
200 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
204 j = ctx->scantable.permutated[i];
205 //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
206 //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]);
207 level = (2*level+1) * qscale * weigth_matrix[i];
208 if (ctx->cid_table->bit_depth == 10) {
209 if (weigth_matrix[i] != 8)
213 if (weigth_matrix[i] != 32)
217 //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
218 block[j] = (level^sign) - sign;
222 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
224 int dct_linesize_luma = ctx->picture.linesize[0];
225 int dct_linesize_chroma = ctx->picture.linesize[1];
226 uint8_t *dest_y, *dest_u, *dest_v;
230 qscale = get_bits(&ctx->gb, 11);
231 skip_bits1(&ctx->gb);
232 //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
234 for (i = 0; i < 8; i++) {
235 ctx->dsp.clear_block(ctx->blocks[i]);
236 dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
239 if (ctx->picture.interlaced_frame) {
240 dct_linesize_luma <<= 1;
241 dct_linesize_chroma <<= 1;
244 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << 4);
245 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3);
246 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3);
248 if (ctx->cur_field) {
249 dest_y += ctx->picture.linesize[0];
250 dest_u += ctx->picture.linesize[1];
251 dest_v += ctx->picture.linesize[2];
254 dct_offset = dct_linesize_luma << 3;
255 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
256 ctx->dsp.idct_put(dest_y + 8, dct_linesize_luma, ctx->blocks[1]);
257 ctx->dsp.idct_put(dest_y + dct_offset, dct_linesize_luma, ctx->blocks[4]);
258 ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]);
260 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
261 dct_offset = dct_linesize_chroma << 3;
262 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
263 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
264 ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]);
265 ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]);
271 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
274 for (y = 0; y < ctx->mb_height; y++) {
277 ctx->last_dc[2] = 1<<(ctx->cid_table->bit_depth+2); // for levels +2^(bitdepth-1)
278 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
279 for (x = 0; x < ctx->mb_width; x++) {
281 dnxhd_decode_macroblock(ctx, x, y);
282 //STOP_TIMER("decode macroblock");
288 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
291 const uint8_t *buf = avpkt->data;
292 int buf_size = avpkt->size;
293 DNXHDContext *ctx = avctx->priv_data;
294 AVFrame *picture = data;
297 av_dlog(avctx, "frame size %d\n", buf_size);
300 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
303 if ((avctx->width || avctx->height) &&
304 (ctx->width != avctx->width || ctx->height != avctx->height)) {
305 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
306 avctx->width, avctx->height, ctx->width, ctx->height);
310 avctx->pix_fmt = PIX_FMT_YUV422P;
311 if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
313 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
316 if (ctx->picture.data[0])
317 avctx->release_buffer(avctx, &ctx->picture);
318 if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
319 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
324 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
326 if (first_field && ctx->picture.interlaced_frame) {
327 buf += ctx->cid_table->coding_unit_size;
328 buf_size -= ctx->cid_table->coding_unit_size;
330 goto decode_coding_unit;
333 *picture = ctx->picture;
334 *data_size = sizeof(AVPicture);
338 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
340 DNXHDContext *ctx = avctx->priv_data;
342 if (ctx->picture.data[0])
343 avctx->release_buffer(avctx, &ctx->picture);
344 free_vlc(&ctx->ac_vlc);
345 free_vlc(&ctx->dc_vlc);
346 free_vlc(&ctx->run_vlc);
350 AVCodec ff_dnxhd_decoder = {
354 sizeof(DNXHDContext),
360 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),