libxavs.c
Go to the documentation of this file.
1 /*
2  * AVS encoding using the xavs library
3  * Copyright (C) 2010 Amanda, Y.N. Wu <amanda11192003@gmail.com>
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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.
11  *
12  * Libav 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.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <math.h>
26 #include <stdint.h>
27 #include <float.h>
28 #include <xavs.h>
29 #include "avcodec.h"
30 #include "internal.h"
31 #include "libavutil/opt.h"
32 
33 #define END_OF_STREAM 0x001
34 
35 #define XAVS_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
36 #define XAVS_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
37 #define XAVS_PART_B8X8 0x100 /* Analyze b16x8, b*/
38 
39 typedef struct XavsContext {
40  xavs_param_t params;
41  xavs_t *enc;
42  xavs_picture_t pic;
43  uint8_t *sei;
44  int sei_size;
47  float crf;
48  int cqp;
49  int b_bias;
50  float cplxblur;
52  int aud;
54  int mbtree;
56 } XavsContext;
57 
58 static void XAVS_log(void *p, int level, const char *fmt, va_list args)
59 {
60  static const int level_map[] = {
61  [XAVS_LOG_ERROR] = AV_LOG_ERROR,
62  [XAVS_LOG_WARNING] = AV_LOG_WARNING,
63  [XAVS_LOG_INFO] = AV_LOG_INFO,
64  [XAVS_LOG_DEBUG] = AV_LOG_DEBUG
65  };
66 
67  if (level < 0 || level > XAVS_LOG_DEBUG)
68  return;
69 
70  av_vlog(p, level_map[level], fmt, args);
71 }
72 
73 static int encode_nals(AVCodecContext *ctx, uint8_t *buf,
74  int size, xavs_nal_t *nals,
75  int nnal, int skip_sei)
76 {
77  XavsContext *x4 = ctx->priv_data;
78  uint8_t *p = buf;
79  int i, s;
80 
81  /* Write the SEI as part of the first frame. */
82  if (x4->sei_size > 0 && nnal > 0) {
83  memcpy(p, x4->sei, x4->sei_size);
84  p += x4->sei_size;
85  x4->sei_size = 0;
86  }
87 
88  for (i = 0; i < nnal; i++) {
89  /* Don't put the SEI in extradata. */
90  if (skip_sei && nals[i].i_type == NAL_SEI) {
91  x4->sei = av_malloc( 5 + nals[i].i_payload * 4 / 3 );
92  if (xavs_nal_encode(x4->sei, &x4->sei_size, 1, nals + i) < 0)
93  return -1;
94 
95  continue;
96  }
97  s = xavs_nal_encode(p, &size, 1, nals + i);
98  if (s < 0)
99  return -1;
100  p += s;
101  }
102 
103  return p - buf;
104 }
105 
106 static int XAVS_frame(AVCodecContext *ctx, uint8_t *buf,
107  int bufsize, void *data)
108 {
109  XavsContext *x4 = ctx->priv_data;
110  AVFrame *frame = data;
111  xavs_nal_t *nal;
112  int nnal, i;
113  xavs_picture_t pic_out;
114 
115  x4->pic.img.i_csp = XAVS_CSP_I420;
116  x4->pic.img.i_plane = 3;
117 
118  if (frame) {
119  for (i = 0; i < 3; i++) {
120  x4->pic.img.plane[i] = frame->data[i];
121  x4->pic.img.i_stride[i] = frame->linesize[i];
122  }
123 
124  x4->pic.i_pts = frame->pts;
125  x4->pic.i_type = XAVS_TYPE_AUTO;
126  }
127 
128  if (xavs_encoder_encode(x4->enc, &nal, &nnal,
129  frame? &x4->pic: NULL, &pic_out) < 0)
130  return -1;
131 
132  bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);
133 
134  if (bufsize < 0)
135  return -1;
136 
137  if (!bufsize && !frame && !(x4->end_of_stream)){
138  buf[bufsize] = 0x0;
139  buf[bufsize+1] = 0x0;
140  buf[bufsize+2] = 0x01;
141  buf[bufsize+3] = 0xb1;
142  bufsize += 4;
144  return bufsize;
145  }
146  /* FIXME: libxavs now provides DTS */
147  /* but AVFrame doesn't have a field for it. */
148  x4->out_pic.pts = pic_out.i_pts;
149 
150  switch (pic_out.i_type) {
151  case XAVS_TYPE_IDR:
152  case XAVS_TYPE_I:
154  break;
155  case XAVS_TYPE_P:
157  break;
158  case XAVS_TYPE_B:
159  case XAVS_TYPE_BREF:
161  break;
162  }
163 
164  /* There is no IDR frame in AVS JiZhun */
165  /* Sequence header is used as a flag */
166  x4->out_pic.key_frame = pic_out.i_type == XAVS_TYPE_I;
167 
168  x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
169 
170  return bufsize;
171 }
172 
174 {
175  XavsContext *x4 = avctx->priv_data;
176 
177  av_freep(&avctx->extradata);
178  av_free(x4->sei);
179 
180  if (x4->enc)
181  xavs_encoder_close(x4->enc);
182 
183  return 0;
184 }
185 
186 static av_cold int XAVS_init(AVCodecContext *avctx)
187 {
188  XavsContext *x4 = avctx->priv_data;
189 
190  x4->sei_size = 0;
191  xavs_param_default(&x4->params);
192 
193  x4->params.pf_log = XAVS_log;
194  x4->params.p_log_private = avctx;
195  x4->params.i_keyint_max = avctx->gop_size;
196  if (avctx->bit_rate) {
197  x4->params.rc.i_bitrate = avctx->bit_rate / 1000;
198  x4->params.rc.i_rc_method = XAVS_RC_ABR;
199  }
200  x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
201  x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate / 1000;
202  x4->params.rc.b_stat_write = avctx->flags & CODEC_FLAG_PASS1;
203  if (avctx->flags & CODEC_FLAG_PASS2) {
204  x4->params.rc.b_stat_read = 1;
205  } else {
206 #if FF_API_X264_GLOBAL_OPTS
207  if (avctx->crf) {
208  x4->params.rc.i_rc_method = XAVS_RC_CRF;
209  x4->params.rc.f_rf_constant = avctx->crf;
210  } else if (avctx->cqp > -1) {
211  x4->params.rc.i_rc_method = XAVS_RC_CQP;
212  x4->params.rc.i_qp_constant = avctx->cqp;
213  }
214 #endif
215 
216  if (x4->crf >= 0) {
217  x4->params.rc.i_rc_method = XAVS_RC_CRF;
218  x4->params.rc.f_rf_constant = x4->crf;
219  } else if (x4->cqp >= 0) {
220  x4->params.rc.i_rc_method = XAVS_RC_CQP;
221  x4->params.rc.i_qp_constant = x4->cqp;
222  }
223  }
224 
225 #if FF_API_X264_GLOBAL_OPTS
226  if (avctx->bframebias)
227  x4->params.i_bframe_bias = avctx->bframebias;
228  if (avctx->deblockalpha)
229  x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;
230  if (avctx->deblockbeta)
231  x4->params.i_deblocking_filter_beta = avctx->deblockbeta;
232  if (avctx->complexityblur >= 0)
233  x4->params.rc.f_complexity_blur = avctx->complexityblur;
234  if (avctx->directpred >= 0)
235  x4->params.analyse.i_direct_mv_pred = avctx->directpred;
236  if (avctx->partitions) {
237  if (avctx->partitions & XAVS_PART_I8X8)
238  x4->params.analyse.inter |= XAVS_ANALYSE_I8x8;
239  if (avctx->partitions & XAVS_PART_P8X8)
240  x4->params.analyse.inter |= XAVS_ANALYSE_PSUB16x16;
241  if (avctx->partitions & XAVS_PART_B8X8)
242  x4->params.analyse.inter |= XAVS_ANALYSE_BSUB16x16;
243  }
244  x4->params.rc.b_mb_tree = !!(avctx->flags2 & CODEC_FLAG2_MBTREE);
245  x4->params.b_aud = avctx->flags2 & CODEC_FLAG2_AUD;
246  x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
247  x4->params.analyse.b_fast_pskip = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;
248  x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
249 #endif
250 
251  if (x4->aud >= 0)
252  x4->params.b_aud = x4->aud;
253  if (x4->mbtree >= 0)
254  x4->params.rc.b_mb_tree = x4->mbtree;
255  if (x4->direct_pred >= 0)
256  x4->params.analyse.i_direct_mv_pred = x4->direct_pred;
257  if (x4->fast_pskip >= 0)
258  x4->params.analyse.b_fast_pskip = x4->fast_pskip;
259  if (x4->mixed_refs >= 0)
260  x4->params.analyse.b_mixed_references = x4->mixed_refs;
261  if (x4->b_bias != INT_MIN)
262  x4->params.i_bframe_bias = x4->b_bias;
263  if (x4->cplxblur >= 0)
264  x4->params.rc.f_complexity_blur = x4->cplxblur;
265 
266  x4->params.i_bframe = avctx->max_b_frames;
267  /* cabac is not included in AVS JiZhun Profile */
268  x4->params.b_cabac = 0;
269 
270  x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
271 
272  avctx->has_b_frames = !!avctx->max_b_frames;
273 
274  /* AVS doesn't allow B picture as reference */
275  /* The max allowed reference frame number of B is 2 */
276  x4->params.i_keyint_min = avctx->keyint_min;
277  if (x4->params.i_keyint_min > x4->params.i_keyint_max)
278  x4->params.i_keyint_min = x4->params.i_keyint_max;
279 
280  x4->params.i_scenecut_threshold = avctx->scenechange_threshold;
281 
282  // x4->params.b_deblocking_filter = avctx->flags & CODEC_FLAG_LOOP_FILTER;
283 
284  x4->params.rc.i_qp_min = avctx->qmin;
285  x4->params.rc.i_qp_max = avctx->qmax;
286  x4->params.rc.i_qp_step = avctx->max_qdiff;
287 
288  x4->params.rc.f_qcompress = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
289  x4->params.rc.f_qblur = avctx->qblur; /* temporally blur quants */
290 
291  x4->params.i_frame_reference = avctx->refs;
292 
293  x4->params.i_width = avctx->width;
294  x4->params.i_height = avctx->height;
295  x4->params.vui.i_sar_width = avctx->sample_aspect_ratio.num;
296  x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;
297  /* This is only used for counting the fps */
298  x4->params.i_fps_num = avctx->time_base.den;
299  x4->params.i_fps_den = avctx->time_base.num;
300  x4->params.analyse.inter = XAVS_ANALYSE_I8x8 |XAVS_ANALYSE_PSUB16x16| XAVS_ANALYSE_BSUB16x16;
301 
302  switch (avctx->me_method) {
303  case ME_EPZS:
304  x4->params.analyse.i_me_method = XAVS_ME_DIA;
305  break;
306  case ME_HEX:
307  x4->params.analyse.i_me_method = XAVS_ME_HEX;
308  break;
309  case ME_UMH:
310  x4->params.analyse.i_me_method = XAVS_ME_UMH;
311  break;
312  case ME_FULL:
313  x4->params.analyse.i_me_method = XAVS_ME_ESA;
314  break;
315  case ME_TESA:
316  x4->params.analyse.i_me_method = XAVS_ME_TESA;
317  break;
318  default:
319  x4->params.analyse.i_me_method = XAVS_ME_HEX;
320  }
321 
322  x4->params.analyse.i_me_range = avctx->me_range;
323  x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality;
324 
325  x4->params.analyse.b_chroma_me = avctx->me_cmp & FF_CMP_CHROMA;
326  /* AVS P2 only enables 8x8 transform */
327  x4->params.analyse.b_transform_8x8 = 1; //avctx->flags2 & CODEC_FLAG2_8X8DCT;
328 
329  x4->params.analyse.i_trellis = avctx->trellis;
330  x4->params.analyse.i_noise_reduction = avctx->noise_reduction;
331 
332  if (avctx->level > 0)
333  x4->params.i_level_idc = avctx->level;
334 
335  x4->params.rc.f_rate_tolerance =
336  (float)avctx->bit_rate_tolerance/avctx->bit_rate;
337 
338  if ((avctx->rc_buffer_size) &&
339  (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
340  x4->params.rc.f_vbv_buffer_init =
341  (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
342  } else
343  x4->params.rc.f_vbv_buffer_init = 0.9;
344 
345  /* TAG:do we have MB tree RC method */
346  /* what is the RC method we are now using? Default NO */
347  x4->params.rc.f_ip_factor = 1 / fabs(avctx->i_quant_factor);
348  x4->params.rc.f_pb_factor = avctx->b_quant_factor;
349  x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
350 
351  x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
352  x4->params.i_log_level = XAVS_LOG_DEBUG;
353  x4->params.i_threads = avctx->thread_count;
354  x4->params.b_interlaced = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
355 
356  if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
357  x4->params.b_repeat_headers = 0;
358 
359  x4->enc = xavs_encoder_open(&x4->params);
360  if (!x4->enc)
361  return -1;
362 
363  avctx->coded_frame = &x4->out_pic;
364  /* TAG: Do we have GLOBAL HEADER in AVS */
365  /* We Have PPS and SPS in AVS */
366  if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
367  xavs_nal_t *nal;
368  int nnal, s;
369 
370  s = xavs_encoder_headers(x4->enc, &nal, &nnal);
371 
372  avctx->extradata = av_malloc(s);
373  avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
374  }
375  return 0;
376 }
377 
378 #define OFFSET(x) offsetof(XavsContext, x)
379 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
380 static const AVOption options[] = {
381  { "crf", "Select the quality for constant quality mode", OFFSET(crf), AV_OPT_TYPE_FLOAT, {-1 }, -1, FLT_MAX, VE },
382  { "qp", "Constant quantization parameter rate control method",OFFSET(cqp), AV_OPT_TYPE_INT, {-1 }, -1, INT_MAX, VE },
383  { "b-bias", "Influences how often B-frames are used", OFFSET(b_bias), AV_OPT_TYPE_INT, {INT_MIN}, INT_MIN, INT_MAX, VE },
384  { "cplxblur", "Reduce fluctuations in QP (before curve compression)", OFFSET(cplxblur), AV_OPT_TYPE_FLOAT, {-1 }, -1, FLT_MAX, VE},
385  { "direct-pred", "Direct MV prediction mode", OFFSET(direct_pred), AV_OPT_TYPE_INT, {-1 }, -1, INT_MAX, VE, "direct-pred" },
386  { "none", NULL, 0, AV_OPT_TYPE_CONST, { XAVS_DIRECT_PRED_NONE }, 0, 0, VE, "direct-pred" },
387  { "spatial", NULL, 0, AV_OPT_TYPE_CONST, { XAVS_DIRECT_PRED_SPATIAL }, 0, 0, VE, "direct-pred" },
388  { "temporal", NULL, 0, AV_OPT_TYPE_CONST, { XAVS_DIRECT_PRED_TEMPORAL }, 0, 0, VE, "direct-pred" },
389  { "auto", NULL, 0, AV_OPT_TYPE_CONST, { XAVS_DIRECT_PRED_AUTO }, 0, 0, VE, "direct-pred" },
390  { "aud", "Use access unit delimiters.", OFFSET(aud), AV_OPT_TYPE_INT, {-1 }, -1, 1, VE},
391  { "mbtree", "Use macroblock tree ratecontrol.", OFFSET(mbtree), AV_OPT_TYPE_INT, {-1 }, -1, 1, VE},
392  { "mixed-refs", "One reference per partition, as opposed to one reference per macroblock", OFFSET(mixed_refs), AV_OPT_TYPE_INT, {-1}, -1, 1, VE },
393  { "fast-pskip", NULL, OFFSET(fast_pskip), AV_OPT_TYPE_INT, {-1 }, -1, 1, VE},
394  { NULL },
395 };
396 
397 static const AVClass class = {
398  .class_name = "libxavs",
399  .item_name = av_default_item_name,
400  .option = options,
402 };
403 
404 static const AVCodecDefault xavs_defaults[] = {
405  { "b", "0" },
406  { NULL },
407 };
408 
410  .name = "libxavs",
411  .type = AVMEDIA_TYPE_VIDEO,
412  .id = CODEC_ID_CAVS,
413  .priv_data_size = sizeof(XavsContext),
414  .init = XAVS_init,
415  .encode = XAVS_frame,
416  .close = XAVS_close,
417  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_AUTO_THREADS,
418  .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
419  .long_name = NULL_IF_CONFIG_SMALL("libxavs - the Chinese Audio Video Standard Encoder"),
420  .priv_class = &class,
421  .defaults = xavs_defaults,
422 };
423