libxavs.c
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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/internal.h"
32 #include "libavutil/mem.h"
33 #include "libavutil/opt.h"
34 
35 #define END_OF_STREAM 0x001
36 
37 #define XAVS_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
38 #define XAVS_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
39 #define XAVS_PART_B8X8 0x100 /* Analyze b16x8, b*/
40 
41 typedef struct XavsContext {
42  AVClass *class;
43  xavs_param_t params;
44  xavs_t *enc;
45  xavs_picture_t pic;
47  int sei_size;
50  float crf;
51  int cqp;
52  int b_bias;
53  float cplxblur;
55  int aud;
57  int mbtree;
59 
60  int64_t *pts_buffer;
62 } XavsContext;
63 
64 static void XAVS_log(void *p, int level, const char *fmt, va_list args)
65 {
66  static const int level_map[] = {
67  [XAVS_LOG_ERROR] = AV_LOG_ERROR,
68  [XAVS_LOG_WARNING] = AV_LOG_WARNING,
69  [XAVS_LOG_INFO] = AV_LOG_INFO,
70  [XAVS_LOG_DEBUG] = AV_LOG_DEBUG
71  };
72 
73  if (level < 0 || level > XAVS_LOG_DEBUG)
74  return;
75 
76  av_vlog(p, level_map[level], fmt, args);
77 }
78 
79 static int encode_nals(AVCodecContext *ctx, AVPacket *pkt,
80  xavs_nal_t *nals, int nnal)
81 {
82  XavsContext *x4 = ctx->priv_data;
83  uint8_t *p;
84  int i, s, ret, size = x4->sei_size + FF_MIN_BUFFER_SIZE;
85 
86  if (!nnal)
87  return 0;
88 
89  for (i = 0; i < nnal; i++)
90  size += nals[i].i_payload;
91 
92  if ((ret = ff_alloc_packet(pkt, size)) < 0) {
93  av_log(ctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", size);
94  return ret;
95  }
96  p = pkt->data;
97 
98  /* Write the SEI as part of the first frame. */
99  if (x4->sei_size > 0 && nnal > 0) {
100  memcpy(p, x4->sei, x4->sei_size);
101  p += x4->sei_size;
102  x4->sei_size = 0;
103  }
104 
105  for (i = 0; i < nnal; i++) {
106  s = xavs_nal_encode(p, &size, 1, nals + i);
107  if (s < 0)
108  return -1;
109  p += s;
110  }
111  pkt->size = p - pkt->data;
112 
113  return 1;
114 }
115 
116 static int XAVS_frame(AVCodecContext *ctx, AVPacket *pkt,
117  const AVFrame *frame, int *got_packet)
118 {
119  XavsContext *x4 = ctx->priv_data;
120  xavs_nal_t *nal;
121  int nnal, i, ret;
122  xavs_picture_t pic_out;
123 
124  x4->pic.img.i_csp = XAVS_CSP_I420;
125  x4->pic.img.i_plane = 3;
126 
127  if (frame) {
128  for (i = 0; i < 3; i++) {
129  x4->pic.img.plane[i] = frame->data[i];
130  x4->pic.img.i_stride[i] = frame->linesize[i];
131  }
132 
133  x4->pic.i_pts = frame->pts;
134  x4->pic.i_type = XAVS_TYPE_AUTO;
135  x4->pts_buffer[ctx->frame_number % (ctx->max_b_frames+1)] = frame->pts;
136  }
137 
138  if (xavs_encoder_encode(x4->enc, &nal, &nnal,
139  frame? &x4->pic: NULL, &pic_out) < 0)
140  return -1;
141 
142  ret = encode_nals(ctx, pkt, nal, nnal);
143 
144  if (ret < 0)
145  return -1;
146 
147  if (!ret) {
148  if (!frame && !(x4->end_of_stream)) {
149  if ((ret = ff_alloc_packet(pkt, 4)) < 0)
150  return ret;
151 
152  pkt->data[0] = 0x0;
153  pkt->data[1] = 0x0;
154  pkt->data[2] = 0x01;
155  pkt->data[3] = 0xb1;
156  pkt->dts = 2*x4->pts_buffer[(x4->out_frame_count-1)%(ctx->max_b_frames+1)] -
157  x4->pts_buffer[(x4->out_frame_count-2)%(ctx->max_b_frames+1)];
159  *got_packet = 1;
160  }
161  return 0;
162  }
163 
164  x4->out_pic.pts = pic_out.i_pts;
165  pkt->pts = pic_out.i_pts;
166  if (ctx->has_b_frames) {
167  if (!x4->out_frame_count)
168  pkt->dts = pkt->pts - (x4->pts_buffer[1] - x4->pts_buffer[0]);
169  else
170  pkt->dts = x4->pts_buffer[(x4->out_frame_count-1)%(ctx->max_b_frames+1)];
171  } else
172  pkt->dts = pkt->pts;
173 
174  switch (pic_out.i_type) {
175  case XAVS_TYPE_IDR:
176  case XAVS_TYPE_I:
178  break;
179  case XAVS_TYPE_P:
181  break;
182  case XAVS_TYPE_B:
183  case XAVS_TYPE_BREF:
185  break;
186  }
187 
188  /* There is no IDR frame in AVS JiZhun */
189  /* Sequence header is used as a flag */
190  if (pic_out.i_type == XAVS_TYPE_I) {
191  x4->out_pic.key_frame = 1;
192  pkt->flags |= AV_PKT_FLAG_KEY;
193  }
194 
195  x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
196 
197  x4->out_frame_count++;
198  *got_packet = ret;
199  return 0;
200 }
201 
203 {
204  XavsContext *x4 = avctx->priv_data;
205 
206  av_freep(&avctx->extradata);
207  av_free(x4->sei);
208  av_freep(&x4->pts_buffer);
209 
210  if (x4->enc)
211  xavs_encoder_close(x4->enc);
212 
213  return 0;
214 }
215 
216 static av_cold int XAVS_init(AVCodecContext *avctx)
217 {
218  XavsContext *x4 = avctx->priv_data;
219 
220  x4->sei_size = 0;
221  xavs_param_default(&x4->params);
222 
223  x4->params.pf_log = XAVS_log;
224  x4->params.p_log_private = avctx;
225  x4->params.i_keyint_max = avctx->gop_size;
226  if (avctx->bit_rate) {
227  x4->params.rc.i_bitrate = avctx->bit_rate / 1000;
228  x4->params.rc.i_rc_method = XAVS_RC_ABR;
229  }
230  x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
231  x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate / 1000;
232  x4->params.rc.b_stat_write = avctx->flags & CODEC_FLAG_PASS1;
233  if (avctx->flags & CODEC_FLAG_PASS2) {
234  x4->params.rc.b_stat_read = 1;
235  } else {
236  if (x4->crf >= 0) {
237  x4->params.rc.i_rc_method = XAVS_RC_CRF;
238  x4->params.rc.f_rf_constant = x4->crf;
239  } else if (x4->cqp >= 0) {
240  x4->params.rc.i_rc_method = XAVS_RC_CQP;
241  x4->params.rc.i_qp_constant = x4->cqp;
242  }
243  }
244 
245  if (x4->aud >= 0)
246  x4->params.b_aud = x4->aud;
247  if (x4->mbtree >= 0)
248  x4->params.rc.b_mb_tree = x4->mbtree;
249  if (x4->direct_pred >= 0)
250  x4->params.analyse.i_direct_mv_pred = x4->direct_pred;
251  if (x4->fast_pskip >= 0)
252  x4->params.analyse.b_fast_pskip = x4->fast_pskip;
253  if (x4->mixed_refs >= 0)
254  x4->params.analyse.b_mixed_references = x4->mixed_refs;
255  if (x4->b_bias != INT_MIN)
256  x4->params.i_bframe_bias = x4->b_bias;
257  if (x4->cplxblur >= 0)
258  x4->params.rc.f_complexity_blur = x4->cplxblur;
259 
260  x4->params.i_bframe = avctx->max_b_frames;
261  /* cabac is not included in AVS JiZhun Profile */
262  x4->params.b_cabac = 0;
263 
264  x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
265 
266  avctx->has_b_frames = !!avctx->max_b_frames;
267 
268  /* AVS doesn't allow B picture as reference */
269  /* The max allowed reference frame number of B is 2 */
270  x4->params.i_keyint_min = avctx->keyint_min;
271  if (x4->params.i_keyint_min > x4->params.i_keyint_max)
272  x4->params.i_keyint_min = x4->params.i_keyint_max;
273 
274  x4->params.i_scenecut_threshold = avctx->scenechange_threshold;
275 
276  // x4->params.b_deblocking_filter = avctx->flags & CODEC_FLAG_LOOP_FILTER;
277 
278  x4->params.rc.i_qp_min = avctx->qmin;
279  x4->params.rc.i_qp_max = avctx->qmax;
280  x4->params.rc.i_qp_step = avctx->max_qdiff;
281 
282  x4->params.rc.f_qcompress = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
283  x4->params.rc.f_qblur = avctx->qblur; /* temporally blur quants */
284 
285  x4->params.i_frame_reference = avctx->refs;
286 
287  x4->params.i_width = avctx->width;
288  x4->params.i_height = avctx->height;
289  x4->params.vui.i_sar_width = avctx->sample_aspect_ratio.num;
290  x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;
291  /* This is only used for counting the fps */
292  x4->params.i_fps_num = avctx->time_base.den;
293  x4->params.i_fps_den = avctx->time_base.num;
294  x4->params.analyse.inter = XAVS_ANALYSE_I8x8 |XAVS_ANALYSE_PSUB16x16| XAVS_ANALYSE_BSUB16x16;
295 
296  switch (avctx->me_method) {
297  case ME_EPZS:
298  x4->params.analyse.i_me_method = XAVS_ME_DIA;
299  break;
300  case ME_HEX:
301  x4->params.analyse.i_me_method = XAVS_ME_HEX;
302  break;
303  case ME_UMH:
304  x4->params.analyse.i_me_method = XAVS_ME_UMH;
305  break;
306  case ME_FULL:
307  x4->params.analyse.i_me_method = XAVS_ME_ESA;
308  break;
309  case ME_TESA:
310  x4->params.analyse.i_me_method = XAVS_ME_TESA;
311  break;
312  default:
313  x4->params.analyse.i_me_method = XAVS_ME_HEX;
314  }
315 
316  x4->params.analyse.i_me_range = avctx->me_range;
317  x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality;
318 
319  x4->params.analyse.b_chroma_me = avctx->me_cmp & FF_CMP_CHROMA;
320  /* AVS P2 only enables 8x8 transform */
321  x4->params.analyse.b_transform_8x8 = 1; //avctx->flags2 & CODEC_FLAG2_8X8DCT;
322 
323  x4->params.analyse.i_trellis = avctx->trellis;
324  x4->params.analyse.i_noise_reduction = avctx->noise_reduction;
325 
326  if (avctx->level > 0)
327  x4->params.i_level_idc = avctx->level;
328 
329  x4->params.rc.f_rate_tolerance =
330  (float)avctx->bit_rate_tolerance/avctx->bit_rate;
331 
332  if ((avctx->rc_buffer_size) &&
333  (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
334  x4->params.rc.f_vbv_buffer_init =
335  (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
336  } else
337  x4->params.rc.f_vbv_buffer_init = 0.9;
338 
339  /* TAG:do we have MB tree RC method */
340  /* what is the RC method we are now using? Default NO */
341  x4->params.rc.f_ip_factor = 1 / fabs(avctx->i_quant_factor);
342  x4->params.rc.f_pb_factor = avctx->b_quant_factor;
343  x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
344 
345  x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
346  x4->params.i_log_level = XAVS_LOG_DEBUG;
347  x4->params.i_threads = avctx->thread_count;
348  x4->params.b_interlaced = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
349 
350  if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
351  x4->params.b_repeat_headers = 0;
352 
353  x4->enc = xavs_encoder_open(&x4->params);
354  if (!x4->enc)
355  return -1;
356 
357  if (!(x4->pts_buffer = av_mallocz((avctx->max_b_frames+1) * sizeof(*x4->pts_buffer))))
358  return AVERROR(ENOMEM);
359 
360  avctx->coded_frame = &x4->out_pic;
361  /* TAG: Do we have GLOBAL HEADER in AVS */
362  /* We Have PPS and SPS in AVS */
363  if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
364  xavs_nal_t *nal;
365  int nnal, s, i, size;
366  uint8_t *p;
367 
368  s = xavs_encoder_headers(x4->enc, &nal, &nnal);
369 
370  avctx->extradata = p = av_malloc(s);
371  for (i = 0; i < nnal; i++) {
372  /* Don't put the SEI in extradata. */
373  if (nal[i].i_type == NAL_SEI) {
374  x4->sei = av_malloc( 5 + nal[i].i_payload * 4 / 3 );
375  if (xavs_nal_encode(x4->sei, &x4->sei_size, 1, nal + i) < 0)
376  return -1;
377 
378  continue;
379  }
380  size = xavs_nal_encode(p, &s, 1, nal + i);
381  if (size < 0)
382  return -1;
383  p += size;
384  }
385  avctx->extradata_size = p - avctx->extradata;
386  }
387  return 0;
388 }
389 
390 #define OFFSET(x) offsetof(XavsContext, x)
391 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
392 static const AVOption options[] = {
393  { "crf", "Select the quality for constant quality mode", OFFSET(crf), AV_OPT_TYPE_FLOAT, {-1 }, -1, FLT_MAX, VE },
394  { "qp", "Constant quantization parameter rate control method",OFFSET(cqp), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, VE },
395  { "b-bias", "Influences how often B-frames are used", OFFSET(b_bias), AV_OPT_TYPE_INT, {.i64 = INT_MIN}, INT_MIN, INT_MAX, VE },
396  { "cplxblur", "Reduce fluctuations in QP (before curve compression)", OFFSET(cplxblur), AV_OPT_TYPE_FLOAT, {-1 }, -1, FLT_MAX, VE},
397  { "direct-pred", "Direct MV prediction mode", OFFSET(direct_pred), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, VE, "direct-pred" },
398  { "none", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_NONE }, 0, 0, VE, "direct-pred" },
399  { "spatial", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_SPATIAL }, 0, 0, VE, "direct-pred" },
400  { "temporal", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_TEMPORAL }, 0, 0, VE, "direct-pred" },
401  { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_AUTO }, 0, 0, VE, "direct-pred" },
402  { "aud", "Use access unit delimiters.", OFFSET(aud), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 1, VE},
403  { "mbtree", "Use macroblock tree ratecontrol.", OFFSET(mbtree), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 1, VE},
404  { "mixed-refs", "One reference per partition, as opposed to one reference per macroblock", OFFSET(mixed_refs), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, VE },
405  { "fast-pskip", NULL, OFFSET(fast_pskip), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 1, VE},
406  { NULL },
407 };
408 
409 static const AVClass class = {
410  .class_name = "libxavs",
411  .item_name = av_default_item_name,
412  .option = options,
414 };
415 
416 static const AVCodecDefault xavs_defaults[] = {
417  { "b", "0" },
418  { NULL },
419 };
420 
422  .name = "libxavs",
423  .type = AVMEDIA_TYPE_VIDEO,
424  .id = AV_CODEC_ID_CAVS,
425  .priv_data_size = sizeof(XavsContext),
426  .init = XAVS_init,
427  .encode2 = XAVS_frame,
428  .close = XAVS_close,
429  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_AUTO_THREADS,
430  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
431  .long_name = NULL_IF_CONFIG_SMALL("libxavs Chinese AVS (Audio Video Standard)"),
432  .priv_class = &class,
433  .defaults = xavs_defaults,
434 };