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