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libschroedingerenc.c
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1 /*
2  * Dirac encoder support via Schroedinger libraries
3  * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot 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 /**
23 * @file
24 * Dirac encoder support via libschroedinger-1.0 libraries. More details about
25 * the Schroedinger project can be found at http://www.diracvideo.org/.
26 * The library implements Dirac Specification Version 2.2
27 * (http://dirac.sourceforge.net/specification.html).
28 */
29 
30 #include <schroedinger/schro.h>
31 #include <schroedinger/schrodebug.h>
32 #include <schroedinger/schrovideoformat.h>
33 
34 #include "libavutil/attributes.h"
35 #include "libavutil/avassert.h"
36 #include "avcodec.h"
37 #include "internal.h"
38 #include "libschroedinger.h"
39 #include "bytestream.h"
40 
41 
42 /** libschroedinger encoder private data */
43 typedef struct SchroEncoderParams {
44  /** Schroedinger video format */
45  SchroVideoFormat *format;
46 
47  /** Schroedinger frame format */
48  SchroFrameFormat frame_format;
49 
50  /** frame size */
52 
53  /** Schroedinger encoder handle*/
54  SchroEncoder* encoder;
55 
56  /** buffer to store encoder output before writing it to the frame queue*/
57  unsigned char *enc_buf;
58 
59  /** Size of encoder buffer*/
61 
62  /** queue storing encoded frames */
64 
65  /** end of sequence signalled */
67 
68  /** end of sequence pulled */
70 
71  /* counter for frames submitted to encoder, used as dts */
72  int64_t dts;
74 
75 /**
76 * Works out Schro-compatible chroma format.
77 */
79 {
80  int num_formats = sizeof(schro_pixel_format_map) /
81  sizeof(schro_pixel_format_map[0]);
82  int idx;
83 
84  SchroEncoderParams *p_schro_params = avctx->priv_data;
85 
86  for (idx = 0; idx < num_formats; ++idx) {
87  if (schro_pixel_format_map[idx].ff_pix_fmt == avctx->pix_fmt) {
88  p_schro_params->format->chroma_format =
89  schro_pixel_format_map[idx].schro_pix_fmt;
90  return 0;
91  }
92  }
93 
94  av_log(avctx, AV_LOG_ERROR,
95  "This codec currently only supports planar YUV 4:2:0, 4:2:2"
96  " and 4:4:4 formats.\n");
97 
98  return -1;
99 }
100 
102 {
103  SchroEncoderParams *p_schro_params = avctx->priv_data;
104  SchroVideoFormatEnum preset;
105 
106  /* Initialize the libraries that libschroedinger depends on. */
107  schro_init();
108 
109  /* Create an encoder object. */
110  p_schro_params->encoder = schro_encoder_new();
111 
112  if (!p_schro_params->encoder) {
113  av_log(avctx, AV_LOG_ERROR,
114  "Unrecoverable Error: schro_encoder_new failed. ");
115  return -1;
116  }
117 
118  /* Initialize the format. */
119  preset = ff_get_schro_video_format_preset(avctx);
120  p_schro_params->format =
121  schro_encoder_get_video_format(p_schro_params->encoder);
122  schro_video_format_set_std_video_format(p_schro_params->format, preset);
123  p_schro_params->format->width = avctx->width;
124  p_schro_params->format->height = avctx->height;
125 
126  if (set_chroma_format(avctx) == -1)
127  return -1;
128 
129  if (avctx->color_primaries == AVCOL_PRI_BT709) {
130  p_schro_params->format->colour_primaries = SCHRO_COLOUR_PRIMARY_HDTV;
131  } else if (avctx->color_primaries == AVCOL_PRI_BT470BG) {
132  p_schro_params->format->colour_primaries = SCHRO_COLOUR_PRIMARY_SDTV_625;
133  } else if (avctx->color_primaries == AVCOL_PRI_SMPTE170M) {
134  p_schro_params->format->colour_primaries = SCHRO_COLOUR_PRIMARY_SDTV_525;
135  }
136 
137  if (avctx->colorspace == AVCOL_SPC_BT709) {
138  p_schro_params->format->colour_matrix = SCHRO_COLOUR_MATRIX_HDTV;
139  } else if (avctx->colorspace == AVCOL_SPC_BT470BG) {
140  p_schro_params->format->colour_matrix = SCHRO_COLOUR_MATRIX_SDTV;
141  }
142 
143  if (avctx->color_trc == AVCOL_TRC_BT709) {
144  p_schro_params->format->transfer_function = SCHRO_TRANSFER_CHAR_TV_GAMMA;
145  }
146 
147  if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
148  &p_schro_params->frame_format) == -1) {
149  av_log(avctx, AV_LOG_ERROR,
150  "This codec currently supports only planar YUV 4:2:0, 4:2:2"
151  " and 4:4:4 formats.\n");
152  return -1;
153  }
154 
155  p_schro_params->format->frame_rate_numerator = avctx->time_base.den;
156  p_schro_params->format->frame_rate_denominator = avctx->time_base.num;
157 
158  p_schro_params->frame_size = avpicture_get_size(avctx->pix_fmt,
159  avctx->width,
160  avctx->height);
161 
162  avctx->coded_frame = av_frame_alloc();
163  if (!avctx->coded_frame)
164  return AVERROR(ENOMEM);
165 
166  if (!avctx->gop_size) {
167  schro_encoder_setting_set_double(p_schro_params->encoder,
168  "gop_structure",
169  SCHRO_ENCODER_GOP_INTRA_ONLY);
170 
171  if (avctx->coder_type == FF_CODER_TYPE_VLC)
172  schro_encoder_setting_set_double(p_schro_params->encoder,
173  "enable_noarith", 1);
174  } else {
175  schro_encoder_setting_set_double(p_schro_params->encoder,
176  "au_distance", avctx->gop_size);
177  avctx->has_b_frames = 1;
178  p_schro_params->dts = -1;
179  }
180 
181  /* FIXME - Need to handle SCHRO_ENCODER_RATE_CONTROL_LOW_DELAY. */
182  if (avctx->flags & CODEC_FLAG_QSCALE) {
183  if (!avctx->global_quality) {
184  /* lossless coding */
185  schro_encoder_setting_set_double(p_schro_params->encoder,
186  "rate_control",
187  SCHRO_ENCODER_RATE_CONTROL_LOSSLESS);
188  } else {
189  int quality;
190  schro_encoder_setting_set_double(p_schro_params->encoder,
191  "rate_control",
192  SCHRO_ENCODER_RATE_CONTROL_CONSTANT_QUALITY);
193 
194  quality = avctx->global_quality / FF_QP2LAMBDA;
195  if (quality > 10)
196  quality = 10;
197  schro_encoder_setting_set_double(p_schro_params->encoder,
198  "quality", quality);
199  }
200  } else {
201  schro_encoder_setting_set_double(p_schro_params->encoder,
202  "rate_control",
203  SCHRO_ENCODER_RATE_CONTROL_CONSTANT_BITRATE);
204 
205  schro_encoder_setting_set_double(p_schro_params->encoder,
206  "bitrate", avctx->bit_rate);
207  }
208 
209  if (avctx->flags & CODEC_FLAG_INTERLACED_ME)
210  /* All material can be coded as interlaced or progressive
211  irrespective of the type of source material. */
212  schro_encoder_setting_set_double(p_schro_params->encoder,
213  "interlaced_coding", 1);
214 
215  schro_encoder_setting_set_double(p_schro_params->encoder, "open_gop",
216  !(avctx->flags & CODEC_FLAG_CLOSED_GOP));
217 
218  /* FIXME: Signal range hardcoded to 8-bit data until both libschroedinger
219  * and libdirac support other bit-depth data. */
220  schro_video_format_set_std_signal_range(p_schro_params->format,
221  SCHRO_SIGNAL_RANGE_8BIT_VIDEO);
222 
223  /* Set the encoder format. */
224  schro_encoder_set_video_format(p_schro_params->encoder,
225  p_schro_params->format);
226 
227  /* Set the debug level. */
228  schro_debug_set_level(avctx->debug);
229 
230  schro_encoder_start(p_schro_params->encoder);
231 
232  /* Initialize the encoded frame queue. */
233  ff_schro_queue_init(&p_schro_params->enc_frame_queue);
234  return 0;
235 }
236 
238  const AVFrame *frame)
239 {
240  SchroEncoderParams *p_schro_params = avctx->priv_data;
241  SchroFrame *in_frame;
242  /* Input line size may differ from what the codec supports. Especially
243  * when transcoding from one format to another. So use avpicture_layout
244  * to copy the frame. */
245  in_frame = ff_create_schro_frame(avctx, p_schro_params->frame_format);
246 
247  if (in_frame)
248  avpicture_layout((const AVPicture *)frame, avctx->pix_fmt,
249  avctx->width, avctx->height,
250  in_frame->components[0].data,
251  p_schro_params->frame_size);
252 
253  return in_frame;
254 }
255 
257 {
258  FFSchroEncodedFrame *enc_frame = data;
259 
260  av_freep(&enc_frame->p_encbuf);
261  av_free(enc_frame);
262 }
263 
265  const AVFrame *frame, int *got_packet)
266 {
267  int enc_size = 0;
268  SchroEncoderParams *p_schro_params = avctx->priv_data;
269  SchroEncoder *encoder = p_schro_params->encoder;
270  struct FFSchroEncodedFrame *p_frame_output = NULL;
271  int go = 1;
272  SchroBuffer *enc_buf;
273  int presentation_frame;
274  int parse_code;
275  int last_frame_in_sequence = 0;
276  int pkt_size, ret;
277 
278  if (!frame) {
279  /* Push end of sequence if not already signalled. */
280  if (!p_schro_params->eos_signalled) {
281  schro_encoder_end_of_stream(encoder);
282  p_schro_params->eos_signalled = 1;
283  }
284  } else {
285  /* Allocate frame data to schro input buffer. */
286  SchroFrame *in_frame = libschroedinger_frame_from_data(avctx, frame);
287  /* Load next frame. */
288  schro_encoder_push_frame(encoder, in_frame);
289  }
290 
291  if (p_schro_params->eos_pulled)
292  go = 0;
293 
294  /* Now check to see if we have any output from the encoder. */
295  while (go) {
296  SchroStateEnum state;
297  state = schro_encoder_wait(encoder);
298  switch (state) {
299  case SCHRO_STATE_HAVE_BUFFER:
300  case SCHRO_STATE_END_OF_STREAM:
301  enc_buf = schro_encoder_pull(encoder, &presentation_frame);
302  av_assert0(enc_buf->length > 0);
303  parse_code = enc_buf->data[4];
304 
305  /* All non-frame data is prepended to actual frame data to
306  * be able to set the pts correctly. So we don't write data
307  * to the frame output queue until we actually have a frame
308  */
309  p_schro_params->enc_buf = av_realloc(p_schro_params->enc_buf,
310  p_schro_params->enc_buf_size + enc_buf->length);
311 
312  memcpy(p_schro_params->enc_buf + p_schro_params->enc_buf_size,
313  enc_buf->data, enc_buf->length);
314  p_schro_params->enc_buf_size += enc_buf->length;
315 
316 
317  if (state == SCHRO_STATE_END_OF_STREAM) {
318  p_schro_params->eos_pulled = 1;
319  go = 0;
320  }
321 
322  if (!SCHRO_PARSE_CODE_IS_PICTURE(parse_code)) {
323  schro_buffer_unref(enc_buf);
324  break;
325  }
326 
327  /* Create output frame. */
328  p_frame_output = av_mallocz(sizeof(FFSchroEncodedFrame));
329  /* Set output data. */
330  p_frame_output->size = p_schro_params->enc_buf_size;
331  p_frame_output->p_encbuf = p_schro_params->enc_buf;
332  if (SCHRO_PARSE_CODE_IS_INTRA(parse_code) &&
333  SCHRO_PARSE_CODE_IS_REFERENCE(parse_code))
334  p_frame_output->key_frame = 1;
335 
336  /* Parse the coded frame number from the bitstream. Bytes 14
337  * through 17 represesent the frame number. */
338  p_frame_output->frame_num = AV_RB32(enc_buf->data + 13);
339 
340  ff_schro_queue_push_back(&p_schro_params->enc_frame_queue,
341  p_frame_output);
342  p_schro_params->enc_buf_size = 0;
343  p_schro_params->enc_buf = NULL;
344 
345  schro_buffer_unref(enc_buf);
346 
347  break;
348 
349  case SCHRO_STATE_NEED_FRAME:
350  go = 0;
351  break;
352 
353  case SCHRO_STATE_AGAIN:
354  break;
355 
356  default:
357  av_log(avctx, AV_LOG_ERROR, "Unknown Schro Encoder state\n");
358  return -1;
359  }
360  }
361 
362  /* Copy 'next' frame in queue. */
363 
364  if (p_schro_params->enc_frame_queue.size == 1 &&
365  p_schro_params->eos_pulled)
366  last_frame_in_sequence = 1;
367 
368  p_frame_output = ff_schro_queue_pop(&p_schro_params->enc_frame_queue);
369 
370  if (!p_frame_output)
371  return 0;
372 
373  pkt_size = p_frame_output->size;
374  if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0)
375  pkt_size += p_schro_params->enc_buf_size;
376  if ((ret = ff_alloc_packet2(avctx, pkt, pkt_size)) < 0)
377  goto error;
378 
379  memcpy(pkt->data, p_frame_output->p_encbuf, p_frame_output->size);
380  avctx->coded_frame->key_frame = p_frame_output->key_frame;
381  /* Use the frame number of the encoded frame as the pts. It is OK to
382  * do so since Dirac is a constant frame rate codec. It expects input
383  * to be of constant frame rate. */
384  pkt->pts =
385  avctx->coded_frame->pts = p_frame_output->frame_num;
386  pkt->dts = p_schro_params->dts++;
387  enc_size = p_frame_output->size;
388 
389  /* Append the end of sequence information to the last frame in the
390  * sequence. */
391  if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0) {
392  memcpy(pkt->data + enc_size, p_schro_params->enc_buf,
393  p_schro_params->enc_buf_size);
394  enc_size += p_schro_params->enc_buf_size;
395  av_freep(&p_schro_params->enc_buf);
396  p_schro_params->enc_buf_size = 0;
397  }
398 
399  if (p_frame_output->key_frame)
400  pkt->flags |= AV_PKT_FLAG_KEY;
401  *got_packet = 1;
402 
403 error:
404  /* free frame */
405  libschroedinger_free_frame(p_frame_output);
406  return ret;
407 }
408 
409 
411 {
412  SchroEncoderParams *p_schro_params = avctx->priv_data;
413 
414  /* Close the encoder. */
415  schro_encoder_free(p_schro_params->encoder);
416 
417  /* Free data in the output frame queue. */
418  ff_schro_queue_free(&p_schro_params->enc_frame_queue,
420 
421 
422  /* Free the encoder buffer. */
423  if (p_schro_params->enc_buf_size)
424  av_freep(&p_schro_params->enc_buf);
425 
426  /* Free the video format structure. */
427  av_freep(&p_schro_params->format);
428 
429  av_frame_free(&avctx->coded_frame);
430 
431  return 0;
432 }
433 
434 
436  .name = "libschroedinger",
437  .long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
438  .type = AVMEDIA_TYPE_VIDEO,
439  .id = AV_CODEC_ID_DIRAC,
440  .priv_data_size = sizeof(SchroEncoderParams),
442  .encode2 = libschroedinger_encode_frame,
444  .capabilities = CODEC_CAP_DELAY,
445  .pix_fmts = (const enum AVPixelFormat[]){
447  },
448 };