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 "libavutil/intreadwrite.h"
  32 #include "avcodec.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 /** SchroFrame and Pts relation */
  44 typedef struct LibSchroFrameContext {
  45      SchroFrame *frame;
  46      int64_t pts;
  47 } LibSchroFrameContext;
  48
  49 /** libschroedinger decoder private data */
  50 typedef struct SchroDecoderParams {
  51     /** Schroedinger video format */
  52     SchroVideoFormat *format;
  53
  54     /** Schroedinger frame format */
  55     SchroFrameFormat frame_format;
  56
  57     /** decoder handle */
  58     SchroDecoder* decoder;
  59
  60     /** queue storing decoded frames */
  61     FFSchroQueue dec_frame_queue;
  62
  63     /** end of sequence signalled */
  64     int eos_signalled;
  65
  66     /** end of sequence pulled */
  67     int eos_pulled;
  68
  69     /** decoded picture */
  70     AVFrame dec_frame;
  71 } SchroDecoderParams;
  72
  73 typedef struct SchroParseUnitContext {
  74     const uint8_t *buf;
  75     int           buf_size;
  76 } SchroParseUnitContext;
  77
  78
  79 static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
  80                                                void *priv)
  81 {
  82     av_freep(&priv);
  83 }
  84
  85 static void parse_context_init(SchroParseUnitContext *parse_ctx,
  86                                const uint8_t *buf, int buf_size)
  87 {
  88     parse_ctx->buf           = buf;
  89     parse_ctx->buf_size      = buf_size;
  90 }
  91
  92 static SchroBuffer *find_next_parse_unit(SchroParseUnitContext *parse_ctx)
  93 {
  94     SchroBuffer *enc_buf = NULL;
  95     int next_pu_offset = 0;
  96     unsigned char *in_buf;
  97
  98     if (parse_ctx->buf_size < 13 ||
  99         parse_ctx->buf[0] != 'B' ||
 100         parse_ctx->buf[1] != 'B' ||
 101         parse_ctx->buf[2] != 'C' ||
 102         parse_ctx->buf[3] != 'D')
 103         return NULL;
 104
 105     next_pu_offset = (parse_ctx->buf[5] << 24) +
 106                      (parse_ctx->buf[6] << 16) +
 107                      (parse_ctx->buf[7] <<  8) +
 108                       parse_ctx->buf[8];
 109
 110     if (next_pu_offset == 0 &&
 111         SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4]))
 112         next_pu_offset = 13;
 113
 114     if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset)
 115         return NULL;
 116
 117     in_buf = av_malloc(next_pu_offset);
 118     if (!in_buf) {
 119         av_log(parse_ctx, AV_LOG_ERROR, "Unable to allocate input buffer\n");
 120         return NULL;
 121     }
 122
 123     memcpy(in_buf, parse_ctx->buf, next_pu_offset);
 124     enc_buf       = schro_buffer_new_with_data(in_buf, next_pu_offset);
 125     enc_buf->free = libschroedinger_decode_buffer_free;
 126     enc_buf->priv = in_buf;
 127
 128     parse_ctx->buf      += next_pu_offset;
 129     parse_ctx->buf_size -= next_pu_offset;
 130
 131     return enc_buf;
 132 }
 133
 134 /**
 135 * Returns Libav chroma format.
 136 */
 137 static enum PixelFormat get_chroma_format(SchroChromaFormat schro_pix_fmt)
 138 {
 139     int num_formats = sizeof(schro_pixel_format_map) /
 140                       sizeof(schro_pixel_format_map[0]);
 141     int idx;
 142
 143     for (idx = 0; idx < num_formats; ++idx)
 144         if (schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt)
 145             return schro_pixel_format_map[idx].ff_pix_fmt;
 146     return PIX_FMT_NONE;
 147 }
 148
 149 static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext)
 150 {
 151
 152     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 153     /* First of all, initialize our supporting libraries. */
 154     schro_init();
 155
 156     schro_debug_set_level(avccontext->debug);
 157     p_schro_params->decoder = schro_decoder_new();
 158     schro_decoder_set_skip_ratio(p_schro_params->decoder, 1);
 159
 160     if (!p_schro_params->decoder)
 161         return -1;
 162
 163     /* Initialize the decoded frame queue. */
 164     ff_schro_queue_init(&p_schro_params->dec_frame_queue);
 165     return 0;
 166 }
 167
 168 static void libschroedinger_decode_frame_free(void *frame)
 169 {
 170     schro_frame_unref(frame);
 171 }
 172
 173 static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext)
 174 {
 175     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 176     SchroDecoder *decoder = p_schro_params->decoder;
 177
 178     p_schro_params->format = schro_decoder_get_video_format(decoder);
 179
 180     /* Tell Libav about sequence details. */
 181     if (av_image_check_size(p_schro_params->format->width,
 182                             p_schro_params->format->height, 0, avccontext) < 0) {
 183         av_log(avccontext, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n",
 184                p_schro_params->format->width, p_schro_params->format->height);
 185         avccontext->height = avccontext->width = 0;
 186         return;
 187     }
 188     avccontext->height  = p_schro_params->format->height;
 189     avccontext->width   = p_schro_params->format->width;
 190     avccontext->pix_fmt = get_chroma_format(p_schro_params->format->chroma_format);
 191
 192     if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
 193                                   &p_schro_params->frame_format) == -1) {
 194         av_log(avccontext, AV_LOG_ERROR,
 195                "This codec currently only supports planar YUV 4:2:0, 4:2:2 "
 196                "and 4:4:4 formats.\n");
 197         return;
 198     }
 199
 200     avccontext->time_base.den = p_schro_params->format->frame_rate_numerator;
 201     avccontext->time_base.num = p_schro_params->format->frame_rate_denominator;
 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     int64_t pts  = avpkt->pts;
 211     SchroTag *tag;
 212
 213     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 214     SchroDecoder *decoder = p_schro_params->decoder;
 215     SchroBuffer *enc_buf;
 216     SchroFrame* frame;
 217     int state;
 218     int go = 1;
 219     int outer = 1;
 220     SchroParseUnitContext parse_ctx;
 221     LibSchroFrameContext *framewithpts = NULL;
 222
 223     *data_size = 0;
 224
 225     parse_context_init(&parse_ctx, buf, buf_size);
 226     if (!buf_size) {
 227         if (!p_schro_params->eos_signalled) {
 228             state = schro_decoder_push_end_of_stream(decoder);
 229             p_schro_params->eos_signalled = 1;
 230         }
 231     }
 232
 233     /* Loop through all the individual parse units in the input buffer */
 234     do {
 235         if ((enc_buf = find_next_parse_unit(&parse_ctx))) {
 236             /* Set Schrotag with the pts to be recovered after decoding*/
 237             enc_buf->tag = schro_tag_new(av_malloc(sizeof(int64_t)), av_free);
 238             if (!enc_buf->tag->value) {
 239                 av_log(avccontext, AV_LOG_ERROR, "Unable to allocate SchroTag\n");
 240                 return AVERROR(ENOMEM);
 241             }
 242             AV_WN(64, enc_buf->tag->value, pts);
 243             /* Push buffer into decoder. */
 244             if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) &&
 245                 SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0)
 246                 avccontext->has_b_frames = 1;
 247             state = schro_decoder_push(decoder, enc_buf);
 248             if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
 249                 libschroedinger_handle_first_access_unit(avccontext);
 250             go = 1;
 251         } else
 252             outer = 0;
 253
 254         while (go) {
 255             /* Parse data and process result. */
 256             state = schro_decoder_wait(decoder);
 257             switch (state) {
 258             case SCHRO_DECODER_FIRST_ACCESS_UNIT:
 259                 libschroedinger_handle_first_access_unit(avccontext);
 260                 break;
 261
 262             case SCHRO_DECODER_NEED_BITS:
 263                 /* Need more input data - stop iterating over what we have. */
 264                 go = 0;
 265                 break;
 266
 267             case SCHRO_DECODER_NEED_FRAME:
 268                 /* Decoder needs a frame - create one and push it in. */
 269                 frame = ff_create_schro_frame(avccontext,
 270                                               p_schro_params->frame_format);
 271                 schro_decoder_add_output_picture(decoder, frame);
 272                 break;
 273
 274             case SCHRO_DECODER_OK:
 275                 /* Pull a frame out of the decoder. */
 276                 tag   = schro_decoder_get_picture_tag(decoder);
 277                 frame = schro_decoder_pull(decoder);
 278
 279                 if (frame) {
 280                     /* Add relation between schroframe and pts. */
 281                     framewithpts = av_malloc(sizeof(LibSchroFrameContext));
 282                     if (!framewithpts) {
 283                         av_log(avccontext, AV_LOG_ERROR, "Unable to allocate FrameWithPts\n");
 284                         return AVERROR(ENOMEM);
 285                     }
 286                     framewithpts->frame = frame;
 287                     framewithpts->pts   = AV_RN64(tag->value);
 288                     ff_schro_queue_push_back(&p_schro_params->dec_frame_queue,
 289                                              framewithpts);
 290                 }
 291                 break;
 292             case SCHRO_DECODER_EOS:
 293                 go = 0;
 294                 p_schro_params->eos_pulled = 1;
 295                 schro_decoder_reset(decoder);
 296                 outer = 0;
 297                 break;
 298
 299             case SCHRO_DECODER_ERROR:
 300                 return -1;
 301                 break;
 302             }
 303         }
 304     } while (outer);
 305
 306     /* Grab next frame to be returned from the top of the queue. */
 307     framewithpts = ff_schro_queue_pop(&p_schro_params->dec_frame_queue);
 308
 309     if (framewithpts && framewithpts->frame) {
 310         if (p_schro_params->dec_frame.data[0])
 311             avccontext->release_buffer(avccontext, &p_schro_params->dec_frame);
 312         if (avccontext->get_buffer(avccontext, &p_schro_params->dec_frame) < 0) {
 313             av_log(avccontext, AV_LOG_ERROR, "Unable to allocate buffer\n");
 314             return AVERROR(ENOMEM);
 315         }
 316
 317         memcpy(p_schro_params->dec_frame.data[0],
 318                framewithpts->frame->components[0].data,
 319                framewithpts->frame->components[0].length);
 320
 321         memcpy(p_schro_params->dec_frame.data[1],
 322                framewithpts->frame->components[1].data,
 323                framewithpts->frame->components[1].length);
 324
 325         memcpy(p_schro_params->dec_frame.data[2],
 326                framewithpts->frame->components[2].data,
 327                framewithpts->frame->components[2].length);
 328
 329         /* Fill frame with current buffer data from Schroedinger. */
 330         p_schro_params->dec_frame.format  = -1; /* Unknown -1 */
 331         p_schro_params->dec_frame.width   = framewithpts->frame->width;
 332         p_schro_params->dec_frame.height  = framewithpts->frame->height;
 333         p_schro_params->dec_frame.pkt_pts = framewithpts->pts;
 334         p_schro_params->dec_frame.linesize[0] = framewithpts->frame->components[0].stride;
 335         p_schro_params->dec_frame.linesize[1] = framewithpts->frame->components[1].stride;
 336         p_schro_params->dec_frame.linesize[2] = framewithpts->frame->components[2].stride;
 337
 338         *(AVFrame*)data = p_schro_params->dec_frame;
 339         *data_size      = sizeof(AVFrame);
 340
 341         /* Now free the frame resources. */
 342         libschroedinger_decode_frame_free(framewithpts->frame);
 343         av_free(framewithpts);
 344     } else {
 345         data       = NULL;
 346         *data_size = 0;
 347     }
 348     return buf_size;
 349 }
 350
 351
 352 static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext)
 353 {
 354     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 355     /* Free the decoder. */
 356     schro_decoder_free(p_schro_params->decoder);
 357     av_freep(&p_schro_params->format);
 358
 359     if (p_schro_params->dec_frame.data[0])
 360         avccontext->release_buffer(avccontext, &p_schro_params->dec_frame);
 361
 362     /* Free data in the output frame queue. */
 363     ff_schro_queue_free(&p_schro_params->dec_frame_queue,
 364                         libschroedinger_decode_frame_free);
 365
 366     return 0;
 367 }
 368
 369 static void libschroedinger_flush(AVCodecContext *avccontext)
 370 {
 371     /* Got a seek request. Free the decoded frames queue and then reset
 372      * the decoder */
 373     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 374
 375     /* Free data in the output frame queue. */
 376     ff_schro_queue_free(&p_schro_params->dec_frame_queue,
 377                         libschroedinger_decode_frame_free);
 378
 379     ff_schro_queue_init(&p_schro_params->dec_frame_queue);
 380     schro_decoder_reset(p_schro_params->decoder);
 381     p_schro_params->eos_pulled = 0;
 382     p_schro_params->eos_signalled = 0;
 383 }
 384
 385 AVCodec ff_libschroedinger_decoder = {
 386     .name           = "libschroedinger",
 387     .type           = AVMEDIA_TYPE_VIDEO,
 388     .id             = AV_CODEC_ID_DIRAC,
 389     .priv_data_size = sizeof(SchroDecoderParams),
 390     .init           = libschroedinger_decode_init,
 391     .close          = libschroedinger_decode_close,
 392     .decode         = libschroedinger_decode_frame,
 393     .capabilities   = CODEC_CAP_DELAY,
 394     .flush          = libschroedinger_flush,
 395     .long_name      = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
 396 };