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