1/* 2 * Dirac decoder 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 libavcodec/libschroedingerdec.c 24* Dirac decoder 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 "avcodec.h" 31#include "libdirac_libschro.h" 32#include "libschroedinger.h" 33 34#undef NDEBUG 35#include <assert.h> 36 37 38#include <schroedinger/schro.h> 39#include <schroedinger/schrodebug.h> 40#include <schroedinger/schrovideoformat.h> 41 42/** libschroedinger decoder private data */ 43typedef struct FfmpegSchroDecoderParams 44{ 45 /** Schroedinger video format */ 46 SchroVideoFormat *format; 47 48 /** Schroedinger frame format */ 49 SchroFrameFormat frame_format; 50 51 /** decoder handle */ 52 SchroDecoder* decoder; 53 54 /** queue storing decoded frames */ 55 FfmpegDiracSchroQueue dec_frame_queue; 56 57 /** end of sequence signalled */ 58 int eos_signalled; 59 60 /** end of sequence pulled */ 61 int eos_pulled; 62 63 /** decoded picture */ 64 AVPicture dec_pic; 65} FfmpegSchroDecoderParams; 66 67typedef struct FfmpegSchroParseUnitContext 68{ 69 const uint8_t *buf; 70 int buf_size; 71} FfmpegSchroParseUnitContext; 72 73 74static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf, 75 void *priv); 76 77static void FfmpegSchroParseContextInit (FfmpegSchroParseUnitContext *parse_ctx, 78 const uint8_t *buf, int buf_size) 79{ 80 parse_ctx->buf = buf; 81 parse_ctx->buf_size = buf_size; 82} 83 84static SchroBuffer* FfmpegFindNextSchroParseUnit (FfmpegSchroParseUnitContext *parse_ctx) 85{ 86 SchroBuffer *enc_buf = NULL; 87 int next_pu_offset = 0; 88 unsigned char *in_buf; 89 90 if (parse_ctx->buf_size < 13 || 91 parse_ctx->buf[0] != 'B' || 92 parse_ctx->buf[1] != 'B' || 93 parse_ctx->buf[2] != 'C' || 94 parse_ctx->buf[3] != 'D') 95 return NULL; 96 97 next_pu_offset = (parse_ctx->buf[5] << 24) + 98 (parse_ctx->buf[6] << 16) + 99 (parse_ctx->buf[7] << 8) + 100 parse_ctx->buf[8]; 101 102 if (next_pu_offset == 0 && 103 SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4])) 104 next_pu_offset = 13; 105 106 if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset) 107 return NULL; 108 109 in_buf = av_malloc(next_pu_offset); 110 memcpy (in_buf, parse_ctx->buf, next_pu_offset); 111 enc_buf = schro_buffer_new_with_data (in_buf, next_pu_offset); 112 enc_buf->free = libschroedinger_decode_buffer_free; 113 enc_buf->priv = in_buf; 114 115 parse_ctx->buf += next_pu_offset; 116 parse_ctx->buf_size -= next_pu_offset; 117 118 return enc_buf; 119} 120 121/** 122* Returns FFmpeg chroma format. 123*/ 124static enum PixelFormat GetFfmpegChromaFormat(SchroChromaFormat schro_pix_fmt) 125{ 126 int num_formats = sizeof(ffmpeg_schro_pixel_format_map) / 127 sizeof(ffmpeg_schro_pixel_format_map[0]); 128 int idx; 129 130 for (idx = 0; idx < num_formats; ++idx) { 131 if (ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt) { 132 return ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt; 133 } 134 } 135 return PIX_FMT_NONE; 136} 137 138static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext) 139{ 140 141 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data ; 142 /* First of all, initialize our supporting libraries. */ 143 schro_init(); 144 145 schro_debug_set_level(avccontext->debug); 146 p_schro_params->decoder = schro_decoder_new(); 147 schro_decoder_set_skip_ratio(p_schro_params->decoder, 1); 148 149 if (!p_schro_params->decoder) 150 return -1; 151 152 /* Initialize the decoded frame queue. */ 153 ff_dirac_schro_queue_init (&p_schro_params->dec_frame_queue); 154 return 0 ; 155} 156 157static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf, 158 void *priv) 159{ 160 av_freep(&priv); 161} 162 163static void libschroedinger_decode_frame_free (void *frame) 164{ 165 schro_frame_unref(frame); 166} 167 168static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext) 169{ 170 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; 171 SchroDecoder *decoder = p_schro_params->decoder; 172 173 p_schro_params->format = schro_decoder_get_video_format (decoder); 174 175 /* Tell FFmpeg about sequence details. */ 176 if(avcodec_check_dimensions(avccontext, p_schro_params->format->width, 177 p_schro_params->format->height) < 0) { 178 av_log(avccontext, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n", 179 p_schro_params->format->width, p_schro_params->format->height); 180 avccontext->height = avccontext->width = 0; 181 return; 182 } 183 avccontext->height = p_schro_params->format->height; 184 avccontext->width = p_schro_params->format->width; 185 avccontext->pix_fmt = 186 GetFfmpegChromaFormat(p_schro_params->format->chroma_format); 187 188 if (ff_get_schro_frame_format( p_schro_params->format->chroma_format, 189 &p_schro_params->frame_format) == -1) { 190 av_log (avccontext, AV_LOG_ERROR, 191 "This codec currently only supports planar YUV 4:2:0, 4:2:2 " 192 "and 4:4:4 formats.\n"); 193 return; 194 } 195 196 avccontext->time_base.den = p_schro_params->format->frame_rate_numerator; 197 avccontext->time_base.num = p_schro_params->format->frame_rate_denominator; 198 199 if (p_schro_params->dec_pic.data[0] == NULL) 200 { 201 avpicture_alloc(&p_schro_params->dec_pic, 202 avccontext->pix_fmt, 203 avccontext->width, 204 avccontext->height); 205 } 206} 207 208static int libschroedinger_decode_frame(AVCodecContext *avccontext, 209 void *data, int *data_size, 210 const uint8_t *buf, int buf_size) 211{ 212 213 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; 214 SchroDecoder *decoder = p_schro_params->decoder; 215 SchroVideoFormat *format; 216 AVPicture *picture = data; 217 SchroBuffer *enc_buf; 218 SchroFrame* frame; 219 int state; 220 int go = 1; 221 int outer = 1; 222 FfmpegSchroParseUnitContext parse_ctx; 223 224 *data_size = 0; 225 226 FfmpegSchroParseContextInit (&parse_ctx, buf, buf_size); 227 if (buf_size == 0) { 228 if (!p_schro_params->eos_signalled) { 229 state = schro_decoder_push_end_of_stream(decoder); 230 p_schro_params->eos_signalled = 1; 231 } 232 } 233 234 /* Loop through all the individual parse units in the input buffer */ 235 do { 236 if ((enc_buf = FfmpegFindNextSchroParseUnit(&parse_ctx))) { 237 /* Push buffer into decoder. */ 238 if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) && 239 SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0) 240 avccontext->has_b_frames = 1; 241 state = schro_decoder_push (decoder, enc_buf); 242 if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT) 243 libschroedinger_handle_first_access_unit(avccontext); 244 go = 1; 245 } 246 else 247 outer = 0; 248 format = p_schro_params->format; 249 250 while (go) { 251 /* Parse data and process result. */ 252 state = schro_decoder_wait (decoder); 253 switch (state) 254 { 255 case SCHRO_DECODER_FIRST_ACCESS_UNIT: 256 libschroedinger_handle_first_access_unit (avccontext); 257 break; 258 259 case SCHRO_DECODER_NEED_BITS: 260 /* Need more input data - stop iterating over what we have. */ 261 go = 0; 262 break; 263 264 case SCHRO_DECODER_NEED_FRAME: 265 /* Decoder needs a frame - create one and push it in. */ 266 267 frame = schro_frame_new_and_alloc(NULL, 268 p_schro_params->frame_format, 269 format->width, 270 format->height); 271 schro_decoder_add_output_picture (decoder, frame); 272 break; 273 274 case SCHRO_DECODER_OK: 275 /* Pull a frame out of the decoder. */ 276 frame = schro_decoder_pull (decoder); 277 278 if (frame) { 279 ff_dirac_schro_queue_push_back( 280 &p_schro_params->dec_frame_queue, 281 frame); 282 } 283 break; 284 case SCHRO_DECODER_EOS: 285 go = 0; 286 p_schro_params->eos_pulled = 1; 287 schro_decoder_reset (decoder); 288 outer = 0; 289 break; 290 291 case SCHRO_DECODER_ERROR: 292 return -1; 293 break; 294 } 295 } 296 } while(outer); 297 298 /* Grab next frame to be returned from the top of the queue. */ 299 frame = ff_dirac_schro_queue_pop(&p_schro_params->dec_frame_queue); 300 301 if (frame != NULL) { 302 memcpy (p_schro_params->dec_pic.data[0], 303 frame->components[0].data, 304 frame->components[0].length); 305 306 memcpy (p_schro_params->dec_pic.data[1], 307 frame->components[1].data, 308 frame->components[1].length); 309 310 memcpy (p_schro_params->dec_pic.data[2], 311 frame->components[2].data, 312 frame->components[2].length); 313 314 /* Fill picture with current buffer data from Schroedinger. */ 315 avpicture_fill(picture, p_schro_params->dec_pic.data[0], 316 avccontext->pix_fmt, 317 avccontext->width, avccontext->height); 318 319 *data_size = sizeof(AVPicture); 320 321 /* Now free the frame resources. */ 322 libschroedinger_decode_frame_free (frame); 323 } 324 return buf_size; 325} 326 327 328static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext) 329{ 330 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; 331 /* Free the decoder. */ 332 schro_decoder_free (p_schro_params->decoder); 333 av_freep(&p_schro_params->format); 334 335 avpicture_free (&p_schro_params->dec_pic); 336 337 /* Free data in the output frame queue. */ 338 ff_dirac_schro_queue_free (&p_schro_params->dec_frame_queue, 339 libschroedinger_decode_frame_free); 340 341 return 0 ; 342} 343 344static void libschroedinger_flush (AVCodecContext *avccontext) 345{ 346 /* Got a seek request. Free the decoded frames queue and then reset 347 * the decoder */ 348 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; 349 350 /* Free data in the output frame queue. */ 351 ff_dirac_schro_queue_free (&p_schro_params->dec_frame_queue, 352 libschroedinger_decode_frame_free); 353 354 ff_dirac_schro_queue_init (&p_schro_params->dec_frame_queue); 355 schro_decoder_reset(p_schro_params->decoder); 356 p_schro_params->eos_pulled = 0; 357 p_schro_params->eos_signalled = 0; 358} 359 360AVCodec libschroedinger_decoder = { 361 "libschroedinger", 362 CODEC_TYPE_VIDEO, 363 CODEC_ID_DIRAC, 364 sizeof(FfmpegSchroDecoderParams), 365 libschroedinger_decode_init, 366 NULL, 367 libschroedinger_decode_close, 368 libschroedinger_decode_frame, 369 CODEC_CAP_DELAY, 370 .flush = libschroedinger_flush, 371 .long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"), 372}; 373