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