git.sesse.net Git - ffmpeg/blob - 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 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 /**
  68 * Returns FFmpeg chroma format.
  69 */
  70 static enum PixelFormat GetFfmpegChromaFormat(SchroChromaFormat schro_pix_fmt)
  71 {
  72     int num_formats = sizeof(ffmpeg_schro_pixel_format_map) /
  73                       sizeof(ffmpeg_schro_pixel_format_map[0]);
  74     int idx;
  75
  76     for (idx = 0; idx < num_formats; ++idx) {
  77         if (ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt) {
  78             return ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt;
  79         }
  80     }
  81     return PIX_FMT_NONE;
  82 }
  83
  84 /*-------------------------DECODER------------------------------------------*/
  85
  86 static int libschroedinger_decode_init(AVCodecContext *avccontext)
  87 {
  88
  89     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data ;
  90     /* First of all, initialize our supporting libraries. */
  91     schro_init();
  92
  93     schro_debug_set_level(avccontext->debug);
  94     p_schro_params->decoder =  schro_decoder_new();
  95     schro_decoder_set_skip_ratio(p_schro_params->decoder, 1);
  96
  97     if (!p_schro_params->decoder)
  98         return -1;
  99
 100     /* Initialize the decoded frame queue. */
 101     ff_dirac_schro_queue_init (&p_schro_params->dec_frame_queue);
 102     return 0 ;
 103 }
 104
 105 static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf,
 106                                                 void *priv)
 107 {
 108     av_freep(&priv);
 109 }
 110
 111 static void libschroedinger_decode_frame_free (void *frame)
 112 {
 113     schro_frame_unref(frame);
 114 }
 115
 116 static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext)
 117 {
 118     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
 119     SchroDecoder *decoder = p_schro_params->decoder;
 120
 121     p_schro_params->format = schro_decoder_get_video_format (decoder);
 122
 123     /* Tell FFmpeg about sequence details. */
 124     if(avcodec_check_dimensions(avccontext, p_schro_params->format->width,
 125                                 p_schro_params->format->height) < 0) {
 126         av_log(avccontext, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n",
 127                p_schro_params->format->width, p_schro_params->format->height);
 128         avccontext->height = avccontext->width = 0;
 129         return -1;
 130     }
 131     avccontext->height  = p_schro_params->format->height;
 132     avccontext->width   = p_schro_params->format->width;
 133     avccontext->pix_fmt =
 134                    GetFfmpegChromaFormat(p_schro_params->format->chroma_format);
 135
 136     if (ff_get_schro_frame_format( p_schro_params->format->chroma_format,
 137                                    &p_schro_params->frame_format) == -1) {
 138         av_log (avccontext, AV_LOG_ERROR,
 139                 "This codec currently only supports planar YUV 4:2:0, 4:2:2 "
 140                 "and 4:4:4 formats.\n");
 141         return -1;
 142     }
 143
 144     avccontext->time_base.den = p_schro_params->format->frame_rate_numerator;
 145     avccontext->time_base.num = p_schro_params->format->frame_rate_denominator;
 146
 147     if (p_schro_params->dec_pic.data[0] == NULL)
 148     {
 149         avpicture_alloc(&p_schro_params->dec_pic,
 150                         avccontext->pix_fmt,
 151                         avccontext->width,
 152                         avccontext->height);
 153     }
 154 }
 155
 156 static int libschroedinger_decode_frame(AVCodecContext *avccontext,
 157                                         void *data, int *data_size,
 158                                         const uint8_t *buf, int buf_size)
 159 {
 160
 161     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
 162     SchroDecoder *decoder = p_schro_params->decoder;
 163     SchroVideoFormat *format;
 164     AVPicture *picture = data;
 165     SchroBuffer *enc_buf;
 166     SchroFrame* frame;
 167     int state;
 168     int go = 1;
 169
 170     *data_size = 0;
 171
 172     if (buf_size>0) {
 173         unsigned char *in_buf = av_malloc(buf_size);
 174         memcpy (in_buf, buf, buf_size);
 175         enc_buf = schro_buffer_new_with_data (in_buf, buf_size);
 176         enc_buf->free = libschroedinger_decode_buffer_free;
 177         enc_buf->priv = in_buf;
 178         /* Push buffer into decoder. */
 179         state = schro_decoder_push (decoder, enc_buf);
 180         if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
 181             libschroedinger_handle_first_access_unit(avccontext);
 182     } else {
 183         if (!p_schro_params->eos_signalled) {
 184             state = schro_decoder_push_end_of_stream(decoder);
 185             p_schro_params->eos_signalled = 1;
 186         }
 187     }
 188
 189     format = p_schro_params->format;
 190
 191     while (go) {
 192         /* Parse data and process result. */
 193         state = schro_decoder_wait (decoder);
 194         switch (state)
 195         {
 196         case SCHRO_DECODER_FIRST_ACCESS_UNIT:
 197             libschroedinger_handle_first_access_unit (avccontext);
 198             break;
 199
 200         case SCHRO_DECODER_NEED_BITS:
 201             /* Need more input data - stop iterating over what we have. */
 202             go = 0;
 203             break;
 204
 205         case SCHRO_DECODER_NEED_FRAME:
 206             /* Decoder needs a frame - create one and push it in. */
 207
 208             frame = schro_frame_new_and_alloc(NULL,
 209                                               p_schro_params->frame_format,
 210                                               format->width,
 211                                               format->height);
 212             schro_decoder_add_output_picture (decoder, frame);
 213             break;
 214
 215         case SCHRO_DECODER_OK:
 216             /* Pull a frame out of the decoder. */
 217             frame = schro_decoder_pull (decoder);
 218
 219             if (frame) {
 220                 ff_dirac_schro_queue_push_back(
 221                                              &p_schro_params->dec_frame_queue,
 222                                              frame);
 223             }
 224             break;
 225         case SCHRO_DECODER_EOS:
 226             go = 0;
 227             p_schro_params->eos_pulled = 1;
 228             schro_decoder_reset (decoder);
 229             break;
 230
 231         case SCHRO_DECODER_ERROR:
 232             return -1;
 233             break;
 234         }
 235     }
 236
 237     /* Grab next frame to be returned from the top of the queue. */
 238     frame = ff_dirac_schro_queue_pop(&p_schro_params->dec_frame_queue);
 239
 240     if (frame != NULL) {
 241         memcpy (p_schro_params->dec_pic.data[0],
 242                 frame->components[0].data,
 243                 frame->components[0].length);
 244
 245         memcpy (p_schro_params->dec_pic.data[1],
 246                 frame->components[1].data,
 247                 frame->components[1].length);
 248
 249         memcpy (p_schro_params->dec_pic.data[2],
 250                 frame->components[2].data,
 251                 frame->components[2].length);
 252
 253         /* Fill picture with current buffer data from Schroedinger. */
 254         avpicture_fill(picture, p_schro_params->dec_pic.data[0],
 255                        avccontext->pix_fmt,
 256                        avccontext->width, avccontext->height);
 257
 258         *data_size = sizeof(AVPicture);
 259
 260         /* Now free the frame resources. */
 261         libschroedinger_decode_frame_free (frame);
 262     }
 263     return buf_size;
 264 }
 265
 266
 267 static int libschroedinger_decode_close(AVCodecContext *avccontext)
 268 {
 269     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
 270     /* Free the decoder. */
 271     schro_decoder_free (p_schro_params->decoder);
 272     av_freep(&p_schro_params->format);
 273
 274     avpicture_free (&p_schro_params->dec_pic);
 275
 276     /* Free data in the output frame queue. */
 277     ff_dirac_schro_queue_free (&p_schro_params->dec_frame_queue,
 278                                libschroedinger_decode_frame_free);
 279
 280     return 0 ;
 281 }
 282
 283 static void libschroedinger_flush (AVCodecContext *avccontext)
 284 {
 285     /* Got a seek request. Free the decoded frames queue and then reset
 286      * the decoder */
 287     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
 288
 289     /* Free data in the output frame queue. */
 290     ff_dirac_schro_queue_free (&p_schro_params->dec_frame_queue,
 291                                libschroedinger_decode_frame_free);
 292
 293     ff_dirac_schro_queue_init (&p_schro_params->dec_frame_queue);
 294     schro_decoder_reset(p_schro_params->decoder);
 295     p_schro_params->eos_pulled = 0;
 296     p_schro_params->eos_signalled = 0;
 297 }
 298
 299 AVCodec libschroedinger_decoder = {
 300      "libschroedinger",
 301     CODEC_TYPE_VIDEO,
 302     CODEC_ID_DIRAC,
 303     sizeof(FfmpegSchroDecoderParams),
 304     libschroedinger_decode_init,
 305     NULL,
 306     libschroedinger_decode_close,
 307     libschroedinger_decode_frame,
 308     CODEC_CAP_DELAY,
 309     .flush = libschroedinger_flush
 310 };