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
  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 <string.h>
  31
  32 #include "libavutil/imgutils.h"
  33 #include "libavutil/internal.h"
  34 #include "libavutil/intreadwrite.h"
  35 #include "libavutil/mem.h"
  36 #include "avcodec.h"
  37 #include "internal.h"
  38 #include "libschroedinger.h"
  39
  40 #include <schroedinger/schro.h>
  41 #include <schroedinger/schrodebug.h>
  42 #include <schroedinger/schrovideoformat.h>
  43
  44 /** SchroFrame and Pts relation */
  45 typedef struct LibSchroFrameContext {
  46      SchroFrame *frame;
  47      int64_t pts;
  48 } LibSchroFrameContext;
  49
  50 /** libschroedinger decoder private data */
  51 typedef struct SchroDecoderParams {
  52     /** Schroedinger video format */
  53     SchroVideoFormat *format;
  54
  55     /** Schroedinger frame format */
  56     SchroFrameFormat frame_format;
  57
  58     /** decoder handle */
  59     SchroDecoder* decoder;
  60
  61     /** queue storing decoded frames */
  62     FFSchroQueue dec_frame_queue;
  63
  64     /** end of sequence signalled */
  65     int eos_signalled;
  66
  67     /** end of sequence pulled */
  68     int eos_pulled;
  69
  70     /** decoded picture */
  71     AVFrame dec_frame;
  72 } SchroDecoderParams;
  73
  74 typedef struct SchroParseUnitContext {
  75     const uint8_t *buf;
  76     int           buf_size;
  77 } SchroParseUnitContext;
  78
  79
  80 static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
  81                                                void *priv)
  82 {
  83     av_freep(&priv);
  84 }
  85
  86 static void parse_context_init(SchroParseUnitContext *parse_ctx,
  87                                const uint8_t *buf, int buf_size)
  88 {
  89     parse_ctx->buf           = buf;
  90     parse_ctx->buf_size      = buf_size;
  91 }
  92
  93 static SchroBuffer *find_next_parse_unit(SchroParseUnitContext *parse_ctx)
  94 {
  95     SchroBuffer *enc_buf = NULL;
  96     int next_pu_offset = 0;
  97     unsigned char *in_buf;
  98
  99     if (parse_ctx->buf_size < 13 ||
 100         parse_ctx->buf[0] != 'B' ||
 101         parse_ctx->buf[1] != 'B' ||
 102         parse_ctx->buf[2] != 'C' ||
 103         parse_ctx->buf[3] != 'D')
 104         return NULL;
 105
 106     next_pu_offset = (parse_ctx->buf[5] << 24) +
 107                      (parse_ctx->buf[6] << 16) +
 108                      (parse_ctx->buf[7] <<  8) +
 109                       parse_ctx->buf[8];
 110
 111     if (next_pu_offset == 0 &&
 112         SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4]))
 113         next_pu_offset = 13;
 114
 115     if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset)
 116         return NULL;
 117
 118     in_buf = av_malloc(next_pu_offset);
 119     if (!in_buf) {
 120         av_log(parse_ctx, AV_LOG_ERROR, "Unable to allocate input buffer\n");
 121         return NULL;
 122     }
 123
 124     memcpy(in_buf, parse_ctx->buf, next_pu_offset);
 125     enc_buf       = schro_buffer_new_with_data(in_buf, next_pu_offset);
 126     enc_buf->free = libschroedinger_decode_buffer_free;
 127     enc_buf->priv = in_buf;
 128
 129     parse_ctx->buf      += next_pu_offset;
 130     parse_ctx->buf_size -= next_pu_offset;
 131
 132     return enc_buf;
 133 }
 134
 135 /**
 136 * Returns FFmpeg chroma format.
 137 */
 138 static enum AVPixelFormat get_chroma_format(SchroChromaFormat schro_pix_fmt)
 139 {
 140     int num_formats = sizeof(schro_pixel_format_map) /
 141                       sizeof(schro_pixel_format_map[0]);
 142     int idx;
 143
 144     for (idx = 0; idx < num_formats; ++idx)
 145         if (schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt)
 146             return schro_pixel_format_map[idx].ff_pix_fmt;
 147     return AV_PIX_FMT_NONE;
 148 }
 149
 150 static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext)
 151 {
 152
 153     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 154     /* First of all, initialize our supporting libraries. */
 155     schro_init();
 156
 157     schro_debug_set_level(avccontext->debug);
 158     p_schro_params->decoder = schro_decoder_new();
 159     schro_decoder_set_skip_ratio(p_schro_params->decoder, 1);
 160
 161     if (!p_schro_params->decoder)
 162         return -1;
 163
 164     /* Initialize the decoded frame queue. */
 165     ff_schro_queue_init(&p_schro_params->dec_frame_queue);
 166     return 0;
 167 }
 168
 169 static void libschroedinger_decode_frame_free(void *frame)
 170 {
 171     schro_frame_unref(frame);
 172 }
 173
 174 static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext)
 175 {
 176     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 177     SchroDecoder *decoder = p_schro_params->decoder;
 178
 179     p_schro_params->format = schro_decoder_get_video_format(decoder);
 180
 181     /* Tell FFmpeg about sequence details. */
 182     if (av_image_check_size(p_schro_params->format->width,
 183                             p_schro_params->format->height, 0, avccontext) < 0) {
 184         av_log(avccontext, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n",
 185                p_schro_params->format->width, p_schro_params->format->height);
 186         avccontext->height = avccontext->width = 0;
 187         return;
 188     }
 189     avccontext->height  = p_schro_params->format->height;
 190     avccontext->width   = p_schro_params->format->width;
 191     avccontext->pix_fmt = get_chroma_format(p_schro_params->format->chroma_format);
 192
 193     if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
 194                                   &p_schro_params->frame_format) == -1) {
 195         av_log(avccontext, AV_LOG_ERROR,
 196                "This codec currently only supports planar YUV 4:2:0, 4:2:2 "
 197                "and 4:4:4 formats.\n");
 198         return;
 199     }
 200
 201     avccontext->time_base.den = p_schro_params->format->frame_rate_numerator;
 202     avccontext->time_base.num = p_schro_params->format->frame_rate_denominator;
 203 }
 204
 205 static int libschroedinger_decode_frame(AVCodecContext *avccontext,
 206                                         void *data, int *got_frame,
 207                                         AVPacket *avpkt)
 208 {
 209     const uint8_t *buf = avpkt->data;
 210     int buf_size = avpkt->size;
 211     int64_t pts  = avpkt->pts;
 212     SchroTag *tag;
 213
 214     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 215     SchroDecoder *decoder = p_schro_params->decoder;
 216     SchroBuffer *enc_buf;
 217     SchroFrame* frame;
 218     int state;
 219     int go = 1;
 220     int outer = 1;
 221     SchroParseUnitContext parse_ctx;
 222     LibSchroFrameContext *framewithpts = NULL;
 223
 224     *got_frame = 0;
 225
 226     parse_context_init(&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 = find_next_parse_unit(&parse_ctx))) {
 237             /* Set Schrotag with the pts to be recovered after decoding*/
 238             enc_buf->tag = schro_tag_new(av_malloc(sizeof(int64_t)), av_free);
 239             if (!enc_buf->tag->value) {
 240                 av_log(avccontext, AV_LOG_ERROR, "Unable to allocate SchroTag\n");
 241                 return AVERROR(ENOMEM);
 242             }
 243             AV_WN(64, enc_buf->tag->value, pts);
 244             /* Push buffer into decoder. */
 245             if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) &&
 246                 SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0)
 247                 avccontext->has_b_frames = 1;
 248             state = schro_decoder_push(decoder, enc_buf);
 249             if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
 250                 libschroedinger_handle_first_access_unit(avccontext);
 251             go = 1;
 252         } else
 253             outer = 0;
 254
 255         while (go) {
 256             /* Parse data and process result. */
 257             state = schro_decoder_wait(decoder);
 258             switch (state) {
 259             case SCHRO_DECODER_FIRST_ACCESS_UNIT:
 260                 libschroedinger_handle_first_access_unit(avccontext);
 261                 break;
 262
 263             case SCHRO_DECODER_NEED_BITS:
 264                 /* Need more input data - stop iterating over what we have. */
 265                 go = 0;
 266                 break;
 267
 268             case SCHRO_DECODER_NEED_FRAME:
 269                 /* Decoder needs a frame - create one and push it in. */
 270                 frame = ff_create_schro_frame(avccontext,
 271                                               p_schro_params->frame_format);
 272                 schro_decoder_add_output_picture(decoder, frame);
 273                 break;
 274
 275             case SCHRO_DECODER_OK:
 276                 /* Pull a frame out of the decoder. */
 277                 tag   = schro_decoder_get_picture_tag(decoder);
 278                 frame = schro_decoder_pull(decoder);
 279
 280                 if (frame) {
 281                     /* Add relation between schroframe and pts. */
 282                     framewithpts = av_malloc(sizeof(LibSchroFrameContext));
 283                     if (!framewithpts) {
 284                         av_log(avccontext, AV_LOG_ERROR, "Unable to allocate FrameWithPts\n");
 285                         return AVERROR(ENOMEM);
 286                     }
 287                     framewithpts->frame = frame;
 288                     framewithpts->pts   = AV_RN64(tag->value);
 289                     ff_schro_queue_push_back(&p_schro_params->dec_frame_queue,
 290                                              framewithpts);
 291                 }
 292                 break;
 293             case SCHRO_DECODER_EOS:
 294                 go = 0;
 295                 p_schro_params->eos_pulled = 1;
 296                 schro_decoder_reset(decoder);
 297                 outer = 0;
 298                 break;
 299
 300             case SCHRO_DECODER_ERROR:
 301                 return -1;
 302                 break;
 303             }
 304         }
 305     } while (outer);
 306
 307     /* Grab next frame to be returned from the top of the queue. */
 308     framewithpts = ff_schro_queue_pop(&p_schro_params->dec_frame_queue);
 309
 310     if (framewithpts && framewithpts->frame) {
 311         if (p_schro_params->dec_frame.data[0])
 312             avccontext->release_buffer(avccontext, &p_schro_params->dec_frame);
 313         if (ff_get_buffer(avccontext, &p_schro_params->dec_frame) < 0) {
 314             av_log(avccontext, AV_LOG_ERROR, "Unable to allocate buffer\n");
 315             return AVERROR(ENOMEM);
 316         }
 317
 318         memcpy(p_schro_params->dec_frame.data[0],
 319                framewithpts->frame->components[0].data,
 320                framewithpts->frame->components[0].length);
 321
 322         memcpy(p_schro_params->dec_frame.data[1],
 323                framewithpts->frame->components[1].data,
 324                framewithpts->frame->components[1].length);
 325
 326         memcpy(p_schro_params->dec_frame.data[2],
 327                framewithpts->frame->components[2].data,
 328                framewithpts->frame->components[2].length);
 329
 330         /* Fill frame with current buffer data from Schroedinger. */
 331         p_schro_params->dec_frame.format  = -1; /* Unknown -1 */
 332         p_schro_params->dec_frame.width   = framewithpts->frame->width;
 333         p_schro_params->dec_frame.height  = framewithpts->frame->height;
 334         p_schro_params->dec_frame.pkt_pts = framewithpts->pts;
 335         p_schro_params->dec_frame.linesize[0] = framewithpts->frame->components[0].stride;
 336         p_schro_params->dec_frame.linesize[1] = framewithpts->frame->components[1].stride;
 337         p_schro_params->dec_frame.linesize[2] = framewithpts->frame->components[2].stride;
 338
 339         *(AVFrame*)data = p_schro_params->dec_frame;
 340         *got_frame      = 1;
 341
 342         /* Now free the frame resources. */
 343         libschroedinger_decode_frame_free(framewithpts->frame);
 344         av_free(framewithpts);
 345     } else {
 346         data       = NULL;
 347         *got_frame = 0;
 348     }
 349     return buf_size;
 350 }
 351
 352
 353 static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext)
 354 {
 355     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 356     /* Free the decoder. */
 357     schro_decoder_free(p_schro_params->decoder);
 358     av_freep(&p_schro_params->format);
 359
 360     if (p_schro_params->dec_frame.data[0])
 361         avccontext->release_buffer(avccontext, &p_schro_params->dec_frame);
 362
 363     /* Free data in the output frame queue. */
 364     ff_schro_queue_free(&p_schro_params->dec_frame_queue,
 365                         libschroedinger_decode_frame_free);
 366
 367     return 0;
 368 }
 369
 370 static void libschroedinger_flush(AVCodecContext *avccontext)
 371 {
 372     /* Got a seek request. Free the decoded frames queue and then reset
 373      * the decoder */
 374     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 375
 376     /* Free data in the output frame queue. */
 377     ff_schro_queue_free(&p_schro_params->dec_frame_queue,
 378                         libschroedinger_decode_frame_free);
 379
 380     ff_schro_queue_init(&p_schro_params->dec_frame_queue);
 381     schro_decoder_reset(p_schro_params->decoder);
 382     p_schro_params->eos_pulled = 0;
 383     p_schro_params->eos_signalled = 0;
 384 }
 385
 386 AVCodec ff_libschroedinger_decoder = {
 387     .name           = "libschroedinger",
 388     .type           = AVMEDIA_TYPE_VIDEO,
 389     .id             = AV_CODEC_ID_DIRAC,
 390     .priv_data_size = sizeof(SchroDecoderParams),
 391     .init           = libschroedinger_decode_init,
 392     .close          = libschroedinger_decode_close,
 393     .decode         = libschroedinger_decode_frame,
 394     .capabilities   = CODEC_CAP_DELAY,
 395     .flush          = libschroedinger_flush,
 396     .long_name      = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
 397 };