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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 FFmpeg.
6  *
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.
11  *
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.
16  *
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
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;
46  uint8_t *sei;
47  int sei_size;
48  int end_of_stream;
49  float crf;
50  int cqp;
51  int b_bias;
52  float cplxblur;
53  int direct_pred;
54  int aud;
55  int fast_pskip;
56  int mbtree;
57  int mixed_refs;
58 
59  int64_t *pts_buffer;
60  int out_frame_count;
61 } XavsContext;
62 
63 static void XAVS_log(void *p, int level, const char *fmt, va_list args)
64 {
65  static const int level_map[] = {
66  [XAVS_LOG_ERROR] = AV_LOG_ERROR,
67  [XAVS_LOG_WARNING] = AV_LOG_WARNING,
68  [XAVS_LOG_INFO] = AV_LOG_INFO,
69  [XAVS_LOG_DEBUG] = AV_LOG_DEBUG
70  };
71 
72  if (level < 0 || level > XAVS_LOG_DEBUG)
73  return;
74 
75  av_vlog(p, level_map[level], fmt, args);
76 }
77 
78 static int encode_nals(AVCodecContext *ctx, AVPacket *pkt,
79  xavs_nal_t *nals, int nnal)
80 {
81  XavsContext *x4 = ctx->priv_data;
82  uint8_t *p;
83  int i, s, ret, size = x4->sei_size + FF_MIN_BUFFER_SIZE;
84 
85  if (!nnal)
86  return 0;
87 
88  for (i = 0; i < nnal; i++)
89  size += nals[i].i_payload;
90 
91  if ((ret = ff_alloc_packet2(ctx, pkt, size)) < 0)
92  return ret;
93  p = pkt->data;
94 
95  /* Write the SEI as part of the first frame. */
96  if (x4->sei_size > 0 && nnal > 0) {
97  memcpy(p, x4->sei, x4->sei_size);
98  p += x4->sei_size;
99  x4->sei_size = 0;
100  }
101 
102  for (i = 0; i < nnal; i++) {
103  s = xavs_nal_encode(p, &size, 1, nals + i);
104  if (s < 0)
105  return -1;
106  p += s;
107  }
108  pkt->size = p - pkt->data;
109 
110  return 1;
111 }
112 
113 static int XAVS_frame(AVCodecContext *avctx, AVPacket *pkt,
114  const AVFrame *frame, int *got_packet)
115 {
116  XavsContext *x4 = avctx->priv_data;
117  xavs_nal_t *nal;
118  int nnal, i, ret;
119  xavs_picture_t pic_out;
120 
121  x4->pic.img.i_csp = XAVS_CSP_I420;
122  x4->pic.img.i_plane = 3;
123 
124  if (frame) {
125  for (i = 0; i < 3; i++) {
126  x4->pic.img.plane[i] = frame->data[i];
127  x4->pic.img.i_stride[i] = frame->linesize[i];
128  }
129 
130  x4->pic.i_pts = frame->pts;
131  x4->pic.i_type = XAVS_TYPE_AUTO;
132  x4->pts_buffer[avctx->frame_number % (avctx->max_b_frames+1)] = frame->pts;
133  }
134 
135  if (xavs_encoder_encode(x4->enc, &nal, &nnal,
136  frame? &x4->pic: NULL, &pic_out) < 0)
137  return -1;
138 
139  ret = encode_nals(avctx, pkt, nal, nnal);
140 
141  if (ret < 0)
142  return -1;
143 
144  if (!ret) {
145  if (!frame && !(x4->end_of_stream)) {
146  if ((ret = ff_alloc_packet2(avctx, pkt, 4)) < 0)
147  return ret;
148 
149  pkt->data[0] = 0x0;
150  pkt->data[1] = 0x0;
151  pkt->data[2] = 0x01;
152  pkt->data[3] = 0xb1;
153  pkt->dts = 2*x4->pts_buffer[(x4->out_frame_count-1)%(avctx->max_b_frames+1)] -
154  x4->pts_buffer[(x4->out_frame_count-2)%(avctx->max_b_frames+1)];
155  x4->end_of_stream = END_OF_STREAM;
156  *got_packet = 1;
157  }
158  return 0;
159  }
160 
161  avctx->coded_frame->pts = pic_out.i_pts;
162  pkt->pts = pic_out.i_pts;
163  if (avctx->has_b_frames) {
164  if (!x4->out_frame_count)
165  pkt->dts = pkt->pts - (x4->pts_buffer[1] - x4->pts_buffer[0]);
166  else
167  pkt->dts = x4->pts_buffer[(x4->out_frame_count-1)%(avctx->max_b_frames+1)];
168  } else
169  pkt->dts = pkt->pts;
170 
171  switch (pic_out.i_type) {
172  case XAVS_TYPE_IDR:
173  case XAVS_TYPE_I:
174  avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
175  break;
176  case XAVS_TYPE_P:
177  avctx->coded_frame->pict_type = AV_PICTURE_TYPE_P;
178  break;
179  case XAVS_TYPE_B:
180  case XAVS_TYPE_BREF:
181  avctx->coded_frame->pict_type = AV_PICTURE_TYPE_B;
182  break;
183  }
184 
185  /* There is no IDR frame in AVS JiZhun */
186  /* Sequence header is used as a flag */
187  if (pic_out.i_type == XAVS_TYPE_I) {
188  avctx->coded_frame->key_frame = 1;
189  pkt->flags |= AV_PKT_FLAG_KEY;
190  }
191 
192  avctx->coded_frame->quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
193 
194  x4->out_frame_count++;
195  *got_packet = ret;
196  return 0;
197 }
198 
199 static av_cold int XAVS_close(AVCodecContext *avctx)
200 {
201  XavsContext *x4 = avctx->priv_data;
202 
203  av_freep(&avctx->extradata);
204  av_freep(&x4->sei);
205  av_freep(&x4->pts_buffer);
206 
207  if (x4->enc)
208  xavs_encoder_close(x4->enc);
209 
210  av_frame_free(&avctx->coded_frame);
211 
212  return 0;
213 }
214 
215 static av_cold int XAVS_init(AVCodecContext *avctx)
216 {
217  XavsContext *x4 = avctx->priv_data;
218 
219  x4->sei_size = 0;
220  xavs_param_default(&x4->params);
221 
222  x4->params.pf_log = XAVS_log;
223  x4->params.p_log_private = avctx;
224  x4->params.i_keyint_max = avctx->gop_size;
225  if (avctx->bit_rate) {
226  x4->params.rc.i_bitrate = avctx->bit_rate / 1000;
227  x4->params.rc.i_rc_method = XAVS_RC_ABR;
228  }
229  x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
230  x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate / 1000;
231  x4->params.rc.b_stat_write = avctx->flags & CODEC_FLAG_PASS1;
232  if (avctx->flags & CODEC_FLAG_PASS2) {
233  x4->params.rc.b_stat_read = 1;
234  } else {
235  if (x4->crf >= 0) {
236  x4->params.rc.i_rc_method = XAVS_RC_CRF;
237  x4->params.rc.f_rf_constant = x4->crf;
238  } else if (x4->cqp >= 0) {
239  x4->params.rc.i_rc_method = XAVS_RC_CQP;
240  x4->params.rc.i_qp_constant = x4->cqp;
241  }
242  }
243 
244  if (x4->aud >= 0)
245  x4->params.b_aud = x4->aud;
246  if (x4->mbtree >= 0)
247  x4->params.rc.b_mb_tree = x4->mbtree;
248  if (x4->direct_pred >= 0)
249  x4->params.analyse.i_direct_mv_pred = x4->direct_pred;
250  if (x4->fast_pskip >= 0)
251  x4->params.analyse.b_fast_pskip = x4->fast_pskip;
252  if (x4->mixed_refs >= 0)
253  x4->params.analyse.b_mixed_references = x4->mixed_refs;
254  if (x4->b_bias != INT_MIN)
255  x4->params.i_bframe_bias = x4->b_bias;
256  if (x4->cplxblur >= 0)
257  x4->params.rc.f_complexity_blur = x4->cplxblur;
258 
259  x4->params.i_bframe = avctx->max_b_frames;
260  /* cabac is not included in AVS JiZhun Profile */
261  x4->params.b_cabac = 0;
262 
263  x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
264 
265  avctx->has_b_frames = !!avctx->max_b_frames;
266 
267  /* AVS doesn't allow B picture as reference */
268  /* The max allowed reference frame number of B is 2 */
269  x4->params.i_keyint_min = avctx->keyint_min;
270  if (x4->params.i_keyint_min > x4->params.i_keyint_max)
271  x4->params.i_keyint_min = x4->params.i_keyint_max;
272 
273  x4->params.i_scenecut_threshold = avctx->scenechange_threshold;
274 
275  // x4->params.b_deblocking_filter = avctx->flags & CODEC_FLAG_LOOP_FILTER;
276 
277  x4->params.rc.i_qp_min = avctx->qmin;
278  x4->params.rc.i_qp_max = avctx->qmax;
279  x4->params.rc.i_qp_step = avctx->max_qdiff;
280 
281  x4->params.rc.f_qcompress = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
282  x4->params.rc.f_qblur = avctx->qblur; /* temporally blur quants */
283 
284  x4->params.i_frame_reference = avctx->refs;
285 
286  x4->params.i_width = avctx->width;
287  x4->params.i_height = avctx->height;
288  x4->params.vui.i_sar_width = avctx->sample_aspect_ratio.num;
289  x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;
290  /* This is only used for counting the fps */
291  x4->params.i_fps_num = avctx->time_base.den;
292  x4->params.i_fps_den = avctx->time_base.num;
293  x4->params.analyse.inter = XAVS_ANALYSE_I8x8 |XAVS_ANALYSE_PSUB16x16| XAVS_ANALYSE_BSUB16x16;
294 
295  switch (avctx->me_method) {
296  case ME_EPZS:
297  x4->params.analyse.i_me_method = XAVS_ME_DIA;
298  break;
299  case ME_HEX:
300  x4->params.analyse.i_me_method = XAVS_ME_HEX;
301  break;
302  case ME_UMH:
303  x4->params.analyse.i_me_method = XAVS_ME_UMH;
304  break;
305  case ME_FULL:
306  x4->params.analyse.i_me_method = XAVS_ME_ESA;
307  break;
308  case ME_TESA:
309  x4->params.analyse.i_me_method = XAVS_ME_TESA;
310  break;
311  default:
312  x4->params.analyse.i_me_method = XAVS_ME_HEX;
313  }
314 
315  x4->params.analyse.i_me_range = avctx->me_range;
316  x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality;
317 
318  x4->params.analyse.b_chroma_me = avctx->me_cmp & FF_CMP_CHROMA;
319  /* AVS P2 only enables 8x8 transform */
320  x4->params.analyse.b_transform_8x8 = 1; //avctx->flags2 & CODEC_FLAG2_8X8DCT;
321 
322  x4->params.analyse.i_trellis = avctx->trellis;
323  x4->params.analyse.i_noise_reduction = avctx->noise_reduction;
324 
325  if (avctx->level > 0)
326  x4->params.i_level_idc = avctx->level;
327 
328  x4->params.rc.f_rate_tolerance =
329  (float)avctx->bit_rate_tolerance/avctx->bit_rate;
330 
331  if ((avctx->rc_buffer_size) &&
332  (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
333  x4->params.rc.f_vbv_buffer_init =
334  (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
335  } else
336  x4->params.rc.f_vbv_buffer_init = 0.9;
337 
338  /* TAG:do we have MB tree RC method */
339  /* what is the RC method we are now using? Default NO */
340  x4->params.rc.f_ip_factor = 1 / fabs(avctx->i_quant_factor);
341  x4->params.rc.f_pb_factor = avctx->b_quant_factor;
342  x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
343 
344  x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
345  x4->params.i_log_level = XAVS_LOG_DEBUG;
346  x4->params.i_threads = avctx->thread_count;
347  x4->params.b_interlaced = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
348 
349  if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
350  x4->params.b_repeat_headers = 0;
351 
352  x4->enc = xavs_encoder_open(&x4->params);
353  if (!x4->enc)
354  return -1;
355 
356  if (!(x4->pts_buffer = av_mallocz_array((avctx->max_b_frames+1), sizeof(*x4->pts_buffer))))
357  return AVERROR(ENOMEM);
358 
359  avctx->coded_frame = av_frame_alloc();
360  if (!avctx->coded_frame)
361  return AVERROR(ENOMEM);
362 
363  /* TAG: Do we have GLOBAL HEADER in AVS */
364  /* We Have PPS and SPS in AVS */
365  if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
366  xavs_nal_t *nal;
367  int nnal, s, i, size;
368  uint8_t *p;
369 
370  s = xavs_encoder_headers(x4->enc, &nal, &nnal);
371 
372  avctx->extradata = p = av_malloc(s);
373  for (i = 0; i < nnal; i++) {
374  /* Don't put the SEI in extradata. */
375  if (nal[i].i_type == NAL_SEI) {
376  x4->sei = av_malloc( 5 + nal[i].i_payload * 4 / 3 );
377  if (xavs_nal_encode(x4->sei, &x4->sei_size, 1, nal + i) < 0)
378  return -1;
379 
380  continue;
381  }
382  size = xavs_nal_encode(p, &s, 1, nal + i);
383  if (size < 0)
384  return -1;
385  p += size;
386  }
387  avctx->extradata_size = p - avctx->extradata;
388  }
389  return 0;
390 }
391 
392 #define OFFSET(x) offsetof(XavsContext, x)
393 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
394 static const AVOption options[] = {
395  { "crf", "Select the quality for constant quality mode", OFFSET(crf), AV_OPT_TYPE_FLOAT, {.dbl = -1 }, -1, FLT_MAX, VE },
396  { "qp", "Constant quantization parameter rate control method",OFFSET(cqp), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, VE },
397  { "b-bias", "Influences how often B-frames are used", OFFSET(b_bias), AV_OPT_TYPE_INT, {.i64 = INT_MIN}, INT_MIN, INT_MAX, VE },
398  { "cplxblur", "Reduce fluctuations in QP (before curve compression)", OFFSET(cplxblur), AV_OPT_TYPE_FLOAT, {.dbl = -1 }, -1, FLT_MAX, VE},
399  { "direct-pred", "Direct MV prediction mode", OFFSET(direct_pred), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, VE, "direct-pred" },
400  { "none", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_NONE }, 0, 0, VE, "direct-pred" },
401  { "spatial", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_SPATIAL }, 0, 0, VE, "direct-pred" },
402  { "temporal", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_TEMPORAL }, 0, 0, VE, "direct-pred" },
403  { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_AUTO }, 0, 0, VE, "direct-pred" },
404  { "aud", "Use access unit delimiters.", OFFSET(aud), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 1, VE},
405  { "mbtree", "Use macroblock tree ratecontrol.", OFFSET(mbtree), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 1, VE},
406  { "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 },
407  { "fast-pskip", NULL, OFFSET(fast_pskip), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 1, VE},
408  { NULL },
409 };
410 
411 static const AVClass xavs_class = {
412  .class_name = "libxavs",
413  .item_name = av_default_item_name,
414  .option = options,
415  .version = LIBAVUTIL_VERSION_INT,
416 };
417 
418 static const AVCodecDefault xavs_defaults[] = {
419  { "b", "0" },
420  { NULL },
421 };
422 
423 AVCodec ff_libxavs_encoder = {
424  .name = "libxavs",
425  .long_name = NULL_IF_CONFIG_SMALL("libxavs Chinese AVS (Audio Video Standard)"),
426  .type = AVMEDIA_TYPE_VIDEO,
427  .id = AV_CODEC_ID_CAVS,
428  .priv_data_size = sizeof(XavsContext),
429  .init = XAVS_init,
430  .encode2 = XAVS_frame,
431  .close = XAVS_close,
432  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_AUTO_THREADS,
433  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
434  .priv_class = &xavs_class,
435  .defaults = xavs_defaults,
436 };
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