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#undef NDEBUG 31#include <assert.h> 32 33#include <schroedinger/schro.h> 34#include <schroedinger/schrodebug.h> 35#include <schroedinger/schrovideoformat.h> 36 37#include "avcodec.h" 38#include "libdirac_libschro.h" 39#include "libschroedinger.h" 40 41 42/** libschroedinger encoder private data */ 43typedef struct FfmpegSchroEncoderParams { 44 /** Schroedinger video format */ 45 SchroVideoFormat *format; 46 47 /** Schroedinger frame format */ 48 SchroFrameFormat frame_format; 49 50 /** frame being encoded */ 51 AVFrame picture; 52 53 /** frame size */ 54 int frame_size; 55 56 /** Schroedinger encoder handle*/ 57 SchroEncoder* encoder; 58 59 /** buffer to store encoder output before writing it to the frame queue*/ 60 unsigned char *enc_buf; 61 62 /** Size of encoder buffer*/ 63 int enc_buf_size; 64 65 /** queue storing encoded frames */ 66 FfmpegDiracSchroQueue enc_frame_queue; 67 68 /** end of sequence signalled */ 69 int eos_signalled; 70 71 /** end of sequence pulled */ 72 int eos_pulled; 73} FfmpegSchroEncoderParams; 74 75/** 76* Works out Schro-compatible chroma format. 77*/ 78static int SetSchroChromaFormat(AVCodecContext *avccontext) 79{ 80 int num_formats = sizeof(ffmpeg_schro_pixel_format_map) / 81 sizeof(ffmpeg_schro_pixel_format_map[0]); 82 int idx; 83 84 FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; 85 86 for (idx = 0; idx < num_formats; ++idx) { 87 if (ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt == 88 avccontext->pix_fmt) { 89 p_schro_params->format->chroma_format = 90 ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt; 91 return 0; 92 } 93 } 94 95 av_log(avccontext, AV_LOG_ERROR, 96 "This codec currently only supports planar YUV 4:2:0, 4:2:2" 97 " and 4:4:4 formats.\n"); 98 99 return -1; 100} 101 102static int libschroedinger_encode_init(AVCodecContext *avccontext) 103{ 104 FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; 105 SchroVideoFormatEnum preset; 106 107 /* Initialize the libraries that libschroedinger depends on. */ 108 schro_init(); 109 110 /* Create an encoder object. */ 111 p_schro_params->encoder = schro_encoder_new(); 112 113 if (!p_schro_params->encoder) { 114 av_log(avccontext, AV_LOG_ERROR, 115 "Unrecoverable Error: schro_encoder_new failed. "); 116 return -1; 117 } 118 119 /* Initialize the format. */ 120 preset = ff_get_schro_video_format_preset(avccontext); 121 p_schro_params->format = 122 schro_encoder_get_video_format(p_schro_params->encoder); 123 schro_video_format_set_std_video_format(p_schro_params->format, preset); 124 p_schro_params->format->width = avccontext->width; 125 p_schro_params->format->height = avccontext->height; 126 127 if (SetSchroChromaFormat(avccontext) == -1) 128 return -1; 129 130 if (ff_get_schro_frame_format(p_schro_params->format->chroma_format, 131 &p_schro_params->frame_format) == -1) { 132 av_log(avccontext, AV_LOG_ERROR, 133 "This codec currently supports only planar YUV 4:2:0, 4:2:2" 134 " and 4:4:4 formats.\n"); 135 return -1; 136 } 137 138 p_schro_params->format->frame_rate_numerator = avccontext->time_base.den; 139 p_schro_params->format->frame_rate_denominator = avccontext->time_base.num; 140 141 p_schro_params->frame_size = avpicture_get_size(avccontext->pix_fmt, 142 avccontext->width, 143 avccontext->height); 144 145 avccontext->coded_frame = &p_schro_params->picture; 146 147 if (!avccontext->gop_size) { 148 schro_encoder_setting_set_double(p_schro_params->encoder, 149 "gop_structure", 150 SCHRO_ENCODER_GOP_INTRA_ONLY); 151 152 if (avccontext->coder_type == FF_CODER_TYPE_VLC) 153 schro_encoder_setting_set_double(p_schro_params->encoder, 154 "enable_noarith", 1); 155 } else { 156 schro_encoder_setting_set_double(p_schro_params->encoder, 157 "gop_structure", 158 SCHRO_ENCODER_GOP_BIREF); 159 avccontext->has_b_frames = 1; 160 } 161 162 /* FIXME - Need to handle SCHRO_ENCODER_RATE_CONTROL_LOW_DELAY. */ 163 if (avccontext->flags & CODEC_FLAG_QSCALE) { 164 if (!avccontext->global_quality) { 165 /* lossless coding */ 166 schro_encoder_setting_set_double(p_schro_params->encoder, 167 "rate_control", 168 SCHRO_ENCODER_RATE_CONTROL_LOSSLESS); 169 } else { 170 int noise_threshold; 171 schro_encoder_setting_set_double(p_schro_params->encoder, 172 "rate_control", 173 SCHRO_ENCODER_RATE_CONTROL_CONSTANT_NOISE_THRESHOLD); 174 175 noise_threshold = avccontext->global_quality / FF_QP2LAMBDA; 176 if (noise_threshold > 100) 177 noise_threshold = 100; 178 schro_encoder_setting_set_double(p_schro_params->encoder, 179 "noise_threshold", 180 noise_threshold); 181 } 182 } else { 183 schro_encoder_setting_set_double(p_schro_params->encoder, 184 "rate_control", 185 SCHRO_ENCODER_RATE_CONTROL_CONSTANT_BITRATE); 186 187 schro_encoder_setting_set_double(p_schro_params->encoder, 188 "bitrate", 189 avccontext->bit_rate); 190 191 } 192 193 if (avccontext->flags & CODEC_FLAG_INTERLACED_ME) 194 /* All material can be coded as interlaced or progressive 195 irrespective of the type of source material. */ 196 schro_encoder_setting_set_double(p_schro_params->encoder, 197 "interlaced_coding", 1); 198 199 /* FIXME: Signal range hardcoded to 8-bit data until both libschroedinger 200 * and libdirac support other bit-depth data. */ 201 schro_video_format_set_std_signal_range(p_schro_params->format, 202 SCHRO_SIGNAL_RANGE_8BIT_VIDEO); 203 204 /* Set the encoder format. */ 205 schro_encoder_set_video_format(p_schro_params->encoder, 206 p_schro_params->format); 207 208 /* Set the debug level. */ 209 schro_debug_set_level(avccontext->debug); 210 211 schro_encoder_start(p_schro_params->encoder); 212 213 /* Initialize the encoded frame queue. */ 214 ff_dirac_schro_queue_init(&p_schro_params->enc_frame_queue); 215 return 0; 216} 217 218static SchroFrame *libschroedinger_frame_from_data(AVCodecContext *avccontext, 219 void *in_data) 220{ 221 FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; 222 SchroFrame *in_frame; 223 /* Input line size may differ from what the codec supports. Especially 224 * when transcoding from one format to another. So use avpicture_layout 225 * to copy the frame. */ 226 in_frame = ff_create_schro_frame(avccontext, p_schro_params->frame_format); 227 228 if (in_frame) 229 avpicture_layout((AVPicture *)in_data, avccontext->pix_fmt, 230 avccontext->width, avccontext->height, 231 in_frame->components[0].data, 232 p_schro_params->frame_size); 233 234 return in_frame; 235} 236 237static void SchroedingerFreeFrame(void *data) 238{ 239 FfmpegDiracSchroEncodedFrame *enc_frame = data; 240 241 av_freep(&(enc_frame->p_encbuf)); 242 av_free(enc_frame); 243} 244 245static int libschroedinger_encode_frame(AVCodecContext *avccontext, 246 unsigned char *frame, 247 int buf_size, void *data) 248{ 249 int enc_size = 0; 250 FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; 251 SchroEncoder *encoder = p_schro_params->encoder; 252 struct FfmpegDiracSchroEncodedFrame* p_frame_output = NULL; 253 int go = 1; 254 SchroBuffer *enc_buf; 255 int presentation_frame; 256 int parse_code; 257 int last_frame_in_sequence = 0; 258 259 if (!data) { 260 /* Push end of sequence if not already signalled. */ 261 if (!p_schro_params->eos_signalled) { 262 schro_encoder_end_of_stream(encoder); 263 p_schro_params->eos_signalled = 1; 264 } 265 } else { 266 /* Allocate frame data to schro input buffer. */ 267 SchroFrame *in_frame = libschroedinger_frame_from_data(avccontext, 268 data); 269 /* Load next frame. */ 270 schro_encoder_push_frame(encoder, in_frame); 271 } 272 273 if (p_schro_params->eos_pulled) 274 go = 0; 275 276 /* Now check to see if we have any output from the encoder. */ 277 while (go) { 278 SchroStateEnum state; 279 state = schro_encoder_wait(encoder); 280 switch (state) { 281 case SCHRO_STATE_HAVE_BUFFER: 282 case SCHRO_STATE_END_OF_STREAM: 283 enc_buf = schro_encoder_pull(encoder, &presentation_frame); 284 assert(enc_buf->length > 0); 285 assert(enc_buf->length <= buf_size); 286 parse_code = enc_buf->data[4]; 287 288 /* All non-frame data is prepended to actual frame data to 289 * be able to set the pts correctly. So we don't write data 290 * to the frame output queue until we actually have a frame 291 */ 292 p_schro_params->enc_buf = av_realloc(p_schro_params->enc_buf, 293 p_schro_params->enc_buf_size + enc_buf->length); 294 295 memcpy(p_schro_params->enc_buf + p_schro_params->enc_buf_size, 296 enc_buf->data, enc_buf->length); 297 p_schro_params->enc_buf_size += enc_buf->length; 298 299 300 if (state == SCHRO_STATE_END_OF_STREAM) { 301 p_schro_params->eos_pulled = 1; 302 go = 0; 303 } 304 305 if (!SCHRO_PARSE_CODE_IS_PICTURE(parse_code)) { 306 schro_buffer_unref(enc_buf); 307 break; 308 } 309 310 /* Create output frame. */ 311 p_frame_output = av_mallocz(sizeof(FfmpegDiracSchroEncodedFrame)); 312 /* Set output data. */ 313 p_frame_output->size = p_schro_params->enc_buf_size; 314 p_frame_output->p_encbuf = p_schro_params->enc_buf; 315 if (SCHRO_PARSE_CODE_IS_INTRA(parse_code) && 316 SCHRO_PARSE_CODE_IS_REFERENCE(parse_code)) 317 p_frame_output->key_frame = 1; 318 319 /* Parse the coded frame number from the bitstream. Bytes 14 320 * through 17 represesent the frame number. */ 321 p_frame_output->frame_num = (enc_buf->data[13] << 24) + 322 (enc_buf->data[14] << 16) + 323 (enc_buf->data[15] << 8) + 324 enc_buf->data[16]; 325 326 ff_dirac_schro_queue_push_back(&p_schro_params->enc_frame_queue, 327 p_frame_output); 328 p_schro_params->enc_buf_size = 0; 329 p_schro_params->enc_buf = NULL; 330 331 schro_buffer_unref(enc_buf); 332 333 break; 334 335 case SCHRO_STATE_NEED_FRAME: 336 go = 0; 337 break; 338 339 case SCHRO_STATE_AGAIN: 340 break; 341 342 default: 343 av_log(avccontext, AV_LOG_ERROR, "Unknown Schro Encoder state\n"); 344 return -1; 345 } 346 } 347 348 /* Copy 'next' frame in queue. */ 349 350 if (p_schro_params->enc_frame_queue.size == 1 && 351 p_schro_params->eos_pulled) 352 last_frame_in_sequence = 1; 353 354 p_frame_output = ff_dirac_schro_queue_pop(&p_schro_params->enc_frame_queue); 355 356 if (!p_frame_output) 357 return 0; 358 359 memcpy(frame, p_frame_output->p_encbuf, p_frame_output->size); 360 avccontext->coded_frame->key_frame = p_frame_output->key_frame; 361 /* Use the frame number of the encoded frame as the pts. It is OK to 362 * do so since Dirac is a constant frame rate codec. It expects input 363 * to be of constant frame rate. */ 364 avccontext->coded_frame->pts = p_frame_output->frame_num; 365 enc_size = p_frame_output->size; 366 367 /* Append the end of sequence information to the last frame in the 368 * sequence. */ 369 if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0) { 370 memcpy(frame + enc_size, p_schro_params->enc_buf, 371 p_schro_params->enc_buf_size); 372 enc_size += p_schro_params->enc_buf_size; 373 av_freep(&p_schro_params->enc_buf); 374 p_schro_params->enc_buf_size = 0; 375 } 376 377 /* free frame */ 378 SchroedingerFreeFrame(p_frame_output); 379 380 return enc_size; 381} 382 383 384static int libschroedinger_encode_close(AVCodecContext *avccontext) 385{ 386 387 FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; 388 389 /* Close the encoder. */ 390 schro_encoder_free(p_schro_params->encoder); 391 392 /* Free data in the output frame queue. */ 393 ff_dirac_schro_queue_free(&p_schro_params->enc_frame_queue, 394 SchroedingerFreeFrame); 395 396 397 /* Free the encoder buffer. */ 398 if (p_schro_params->enc_buf_size) 399 av_freep(&p_schro_params->enc_buf); 400 401 /* Free the video format structure. */ 402 av_freep(&p_schro_params->format); 403 404 return 0; 405} 406 407 408AVCodec libschroedinger_encoder = { 409 "libschroedinger", 410 AVMEDIA_TYPE_VIDEO, 411 CODEC_ID_DIRAC, 412 sizeof(FfmpegSchroEncoderParams), 413 libschroedinger_encode_init, 414 libschroedinger_encode_frame, 415 libschroedinger_encode_close, 416 .capabilities = CODEC_CAP_DELAY, 417 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_NONE}, 418 .long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"), 419}; 420