libavcodec/libschroedingerdec.c

   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 */
  43 typedef 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
  67 typedef struct FfmpegSchroParseUnitContext
  68 {
  69     const uint8_t *buf;
  70     int           buf_size;
  71 } FfmpegSchroParseUnitContext;
  72
  73
  74 static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf,
  75                                                 void *priv);
  76
  77 static 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
  84 static 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 */
 124 static 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
 138 static 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
 157 static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf,
 158                                                 void *priv)
 159 {
 160     av_freep(&priv);
 161 }
 162
 163 static void libschroedinger_decode_frame_free (void *frame)
 164 {
 165     schro_frame_unref(frame);
 166 }
 167
 168 static 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
 208 static int libschroedinger_decode_frame(AVCodecContext *avccontext,
 209                                         void *data, int *data_size,
 210                                         AVPacket *avpkt)
 211 {
 212     const uint8_t *buf = avpkt->data;
 213     int buf_size = avpkt->size;
 214
 215     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
 216     SchroDecoder *decoder = p_schro_params->decoder;
 217     SchroVideoFormat *format;
 218     AVPicture *picture = data;
 219     SchroBuffer *enc_buf;
 220     SchroFrame* frame;
 221     int state;
 222     int go = 1;
 223     int outer = 1;
 224     FfmpegSchroParseUnitContext parse_ctx;
 225
 226     *data_size = 0;
 227
 228     FfmpegSchroParseContextInit (&parse_ctx, buf, buf_size);
 229     if (buf_size == 0) {
 230         if (!p_schro_params->eos_signalled) {
 231             state = schro_decoder_push_end_of_stream(decoder);
 232             p_schro_params->eos_signalled = 1;
 233         }
 234     }
 235
 236     /* Loop through all the individual parse units in the input buffer */
 237     do {
 238         if ((enc_buf = FfmpegFindNextSchroParseUnit(&parse_ctx))) {
 239             /* Push buffer into decoder. */
 240             if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) &&
 241                 SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0)
 242                 avccontext->has_b_frames = 1;
 243             state = schro_decoder_push (decoder, enc_buf);
 244             if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
 245                   libschroedinger_handle_first_access_unit(avccontext);
 246             go = 1;
 247         }
 248         else
 249             outer = 0;
 250     format = p_schro_params->format;
 251
 252     while (go) {
 253         /* Parse data and process result. */
 254         state = schro_decoder_wait (decoder);
 255         switch (state)
 256         {
 257         case SCHRO_DECODER_FIRST_ACCESS_UNIT:
 258             libschroedinger_handle_first_access_unit (avccontext);
 259             break;
 260
 261         case SCHRO_DECODER_NEED_BITS:
 262             /* Need more input data - stop iterating over what we have. */
 263             go = 0;
 264             break;
 265
 266         case SCHRO_DECODER_NEED_FRAME:
 267             /* Decoder needs a frame - create one and push it in. */
 268
 269             frame = schro_frame_new_and_alloc(NULL,
 270                                               p_schro_params->frame_format,
 271                                               format->width,
 272                                               format->height);
 273             schro_decoder_add_output_picture (decoder, frame);
 274             break;
 275
 276         case SCHRO_DECODER_OK:
 277             /* Pull a frame out of the decoder. */
 278             frame = schro_decoder_pull (decoder);
 279
 280             if (frame) {
 281                 ff_dirac_schro_queue_push_back(
 282                                              &p_schro_params->dec_frame_queue,
 283                                              frame);
 284             }
 285             break;
 286         case SCHRO_DECODER_EOS:
 287             go = 0;
 288             p_schro_params->eos_pulled = 1;
 289             schro_decoder_reset (decoder);
 290             outer = 0;
 291             break;
 292
 293         case SCHRO_DECODER_ERROR:
 294             return -1;
 295             break;
 296         }
 297     }
 298     } while(outer);
 299
 300     /* Grab next frame to be returned from the top of the queue. */
 301     frame = ff_dirac_schro_queue_pop(&p_schro_params->dec_frame_queue);
 302
 303     if (frame != NULL) {
 304         memcpy (p_schro_params->dec_pic.data[0],
 305                 frame->components[0].data,
 306                 frame->components[0].length);
 307
 308         memcpy (p_schro_params->dec_pic.data[1],
 309                 frame->components[1].data,
 310                 frame->components[1].length);
 311
 312         memcpy (p_schro_params->dec_pic.data[2],
 313                 frame->components[2].data,
 314                 frame->components[2].length);
 315
 316         /* Fill picture with current buffer data from Schroedinger. */
 317         avpicture_fill(picture, p_schro_params->dec_pic.data[0],
 318                        avccontext->pix_fmt,
 319                        avccontext->width, avccontext->height);
 320
 321         *data_size = sizeof(AVPicture);
 322
 323         /* Now free the frame resources. */
 324         libschroedinger_decode_frame_free (frame);
 325     }
 326     return buf_size;
 327 }
 328
 329
 330 static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext)
 331 {
 332     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
 333     /* Free the decoder. */
 334     schro_decoder_free (p_schro_params->decoder);
 335     av_freep(&p_schro_params->format);
 336
 337     avpicture_free (&p_schro_params->dec_pic);
 338
 339     /* Free data in the output frame queue. */
 340     ff_dirac_schro_queue_free (&p_schro_params->dec_frame_queue,
 341                                libschroedinger_decode_frame_free);
 342
 343     return 0 ;
 344 }
 345
 346 static void libschroedinger_flush (AVCodecContext *avccontext)
 347 {
 348     /* Got a seek request. Free the decoded frames queue and then reset
 349      * the decoder */
 350     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
 351
 352     /* Free data in the output frame queue. */
 353     ff_dirac_schro_queue_free (&p_schro_params->dec_frame_queue,
 354                                libschroedinger_decode_frame_free);
 355
 356     ff_dirac_schro_queue_init (&p_schro_params->dec_frame_queue);
 357     schro_decoder_reset(p_schro_params->decoder);
 358     p_schro_params->eos_pulled = 0;
 359     p_schro_params->eos_signalled = 0;
 360 }
 361
 362 AVCodec libschroedinger_decoder = {
 363      "libschroedinger",
 364     CODEC_TYPE_VIDEO,
 365     CODEC_ID_DIRAC,
 366     sizeof(FfmpegSchroDecoderParams),
 367     libschroedinger_decode_init,
 368     NULL,
 369     libschroedinger_decode_close,
 370     libschroedinger_decode_frame,
 371     CODEC_CAP_DELAY,
 372     .flush = libschroedinger_flush,
 373     .long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
 374 };