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
26 #include "bitstream.h"
27 #include "dnxhddata.h"
29 #include "mpegvideo.h"
33 unsigned int width, height;
35 unsigned int frame_size;
38 const uint8_t *luma_weigth, *chroma_weigth;
39 const uint8_t *dc_codes, *dc_bits;
40 const uint16_t *ac_codes;
41 const uint8_t *ac_bits, *ac_level;
42 const uint8_t *ac_run_flag, *ac_index_flag;
43 const uint16_t *run_codes;
44 const uint8_t *run_bits, *run;
48 AVCodecContext *avctx;
51 int cid; ///< compression id
52 unsigned int width, height;
53 unsigned int mb_width, mb_height;
54 uint32_t mb_scan_index[68]; /* max for 1080p */
55 int cur_field; ///< current interlaced field
56 int index_bits; ///< length of index value
57 VLC ac_vlc, dc_vlc, run_vlc;
58 const uint8_t *ac_level, *run;
59 const uint8_t *ac_run_flag, *ac_index_flag;
60 const uint8_t *luma_weigth, *chroma_weigth;
63 DECLARE_ALIGNED_16(DCTELEM, blocks[8][64]);
64 DECLARE_ALIGNED_8(ScanTable, scantable);
65 const CIDEntry *cid_table;
68 static const CIDEntry cid_table[] = {
69 { 1238, 1920, 1080, 0, 917504, 4, 8,
70 dnxhd_1238_luma_weigth, dnxhd_1238_chroma_weigth,
71 dnxhd_1238_dc_codes, dnxhd_1238_dc_bits,
72 dnxhd_1238_ac_codes, dnxhd_1238_ac_bits, dnxhd_1238_ac_level,
73 dnxhd_1238_ac_run_flag, dnxhd_1238_ac_index_flag,
74 dnxhd_1238_run_codes, dnxhd_1238_run_bits, dnxhd_1238_run },
75 /* { 1243, 1920, 1080, 1, 917504, 4, 8, */
76 /* dnxhd_1243_luma_weigth, dnxhd_1243_chroma_weigth, */
77 /* dnxhd_1238_dc_codes, dnxhd_1238_dc_bits, */
78 /* dnxhd_1238_ac_codes, dnxhd_1238_ac_bits, dnxhd_1238_ac_level, */
79 /* dnxhd_1238_ac_run_flag, dnxhd_1238_ac_index_flag, */
80 /* dnxhd_1238_run_codes, dnxhd_1238_run_bits, dnxhd_1238_run }, */
83 static int dnxhd_get_cid_table(int cid)
86 for (i = 0; i < sizeof(cid_table)/sizeof(CIDEntry); i++)
87 if (cid_table[i].cid == cid)
92 #define DNXHD_VLC_BITS 9
93 #define DNXHD_DC_VLC_BITS 6
95 static int dnxhd_decode_init(AVCodecContext *avctx)
97 DNXHDContext *ctx = avctx->priv_data;
100 dsputil_init(&ctx->dsp, avctx);
101 avctx->coded_frame = &ctx->picture;
102 ctx->picture.type = FF_I_TYPE;
106 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
108 if (!ctx->cid_table) {
111 if ((index = dnxhd_get_cid_table(cid)) < 0) {
112 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
115 ctx->cid_table = &cid_table[index];
116 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
117 cid_table->ac_bits, 1, 1,
118 cid_table->ac_codes, 2, 2, 0);
119 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, 12,
120 cid_table->dc_bits, 1, 1,
121 cid_table->dc_codes, 1, 1, 0);
122 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
123 cid_table->run_bits, 1, 1,
124 cid_table->run_codes, 2, 2, 0);
126 ctx->run = cid_table->run;
127 ctx->ac_level = cid_table->ac_level;
128 ctx->ac_run_flag = cid_table->ac_run_flag;
129 ctx->ac_index_flag = cid_table->ac_index_flag;
130 ctx->luma_weigth = cid_table->luma_weigth;
131 ctx->chroma_weigth = cid_table->chroma_weigth;
133 ctx->index_bits = cid_table->index_bits;
135 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
140 static int dnxhd_decode_header(DNXHDContext *ctx, uint8_t *buf, int buf_size)
142 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
145 if (buf_size < 0x280)
148 if (memcmp(buf, header_prefix, 5)) {
149 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
152 if (buf[5] & 2) {/* interlaced FIXME top or bottom */
153 ctx->picture.interlaced_frame = 1;
154 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d\n", buf[5] & 3);
157 ctx->height = AV_RB16(buf + 0x18);
158 ctx->width = AV_RB16(buf + 0x1a);
160 dprintf(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
162 if (buf[0x21] & 0x80) {
163 av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
167 ctx->cid = AV_RB32(buf + 0x28);
168 dprintf(ctx->avctx, "compression id %d\n", ctx->cid);
170 if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
173 if (buf_size < ctx->cid_table->frame_size) {
174 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
178 ctx->mb_width = ctx->width>>4;
179 ctx->mb_height = buf[0x16d];
181 if (ctx->mb_height > 68) {
182 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big\n");
186 dprintf(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
187 for (i = 0; i < ctx->mb_height; i++) {
188 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
189 dprintf(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
190 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
191 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
199 static int dnxhd_decode_dc(DNXHDContext *ctx)
203 len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
204 return len ? get_xbits(&ctx->gb, len) : 0;
207 static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
209 int i, j, index, index2;
210 int level, component, sign;
211 const uint8_t *weigth_matrix;
214 component = 1 + (n&1);
215 weigth_matrix = ctx->chroma_weigth;
218 weigth_matrix = ctx->luma_weigth;
221 ctx->last_dc[component] += dnxhd_decode_dc(ctx);
222 block[0] = ctx->last_dc[component];
223 //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
225 index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
226 //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index);
227 level = ctx->ac_level[index];
228 if (!level) { /* EOB */
229 //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
232 sign = get_sbits(&ctx->gb, 1);
234 if (ctx->ac_index_flag[index]) {
235 level += get_bits(&ctx->gb, ctx->index_bits)<<6;
238 if (ctx->ac_run_flag[index]) {
239 index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
240 i += ctx->run[index2];
243 j = ctx->scantable.permutated[i];
244 //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
245 //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]);
246 level = (2*level+1) * qscale * weigth_matrix[i];
247 if (weigth_matrix[i] != 32) // FIXME 10bit
250 level = (level^sign) - sign;
253 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
257 //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
262 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
264 int dct_linesize_luma = ctx->picture.linesize[0];
265 int dct_linesize_chroma = ctx->picture.linesize[1];
266 uint8_t *dest_y, *dest_u, *dest_v;
270 ctx->dsp.clear_blocks(ctx->blocks[0]);
271 ctx->dsp.clear_blocks(ctx->blocks[2]); // FIXME change clear blocks to take block amount
273 qscale = get_bits(&ctx->gb, 11);
274 skip_bits1(&ctx->gb);
275 //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
277 for (i = 0; i < 8; i++) {
278 dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
280 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << 4);
281 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3);
282 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3);
284 dct_offset = dct_linesize_luma << 3;
285 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
286 ctx->dsp.idct_put(dest_y + 8, dct_linesize_luma, ctx->blocks[1]);
287 ctx->dsp.idct_put(dest_y + dct_offset, dct_linesize_luma, ctx->blocks[4]);
288 ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]);
290 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
291 dct_offset = dct_linesize_chroma << 3;
292 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
293 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
294 ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]);
295 ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]);
301 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, uint8_t *buf, int buf_size)
304 for (y = 0; y < ctx->mb_height; y++) {
305 memset(ctx->last_dc, 4, sizeof(ctx->last_dc)); // 4 for levels +128
306 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
307 for (x = 0; x < ctx->mb_width; x++) {
309 dnxhd_decode_macroblock(ctx, x, y);
310 //STOP_TIMER("decode macroblock");
316 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
317 uint8_t *buf, int buf_size)
319 DNXHDContext *ctx = avctx->priv_data;
320 AVFrame *picture = data;
322 dprintf(avctx, "frame size %d\n", buf_size);
324 if (dnxhd_decode_header(ctx, buf, buf_size) < 0)
327 avctx->pix_fmt = PIX_FMT_YUV422P;
328 if (avcodec_check_dimensions(avctx, ctx->width, ctx->height))
330 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
332 if (ctx->picture.data[0])
333 avctx->release_buffer(avctx, &ctx->picture);
334 if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
335 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
339 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
341 *picture = ctx->picture;
342 *data_size = sizeof(AVPicture);
346 static int dnxhd_decode_close(AVCodecContext *avctx)
348 DNXHDContext *ctx = avctx->priv_data;
350 if(ctx->picture.data[0])
351 avctx->release_buffer(avctx, &ctx->picture);
352 free_vlc(&ctx->ac_vlc);
353 free_vlc(&ctx->dc_vlc);
354 free_vlc(&ctx->run_vlc);
358 AVCodec dnxhd_decoder = {
362 sizeof(DNXHDContext),