git.sesse.net Git - ffmpeg/blob - libavcodec/libschroedingerenc.c

   1 /*
   2  * Dirac encoder 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 encoder 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 <schroedinger/schro.h>
  31 #include <schroedinger/schrodebug.h>
  32 #include <schroedinger/schrovideoformat.h>
  33
  34 #include "libavutil/avassert.h"
  35 #include "avcodec.h"
  36 #include "internal.h"
  37 #include "libschroedinger.h"
  38 #include "bytestream.h"
  39
  40
  41 /** libschroedinger encoder private data */
  42 typedef struct SchroEncoderParams {
  43     /** Schroedinger video format */
  44     SchroVideoFormat *format;
  45
  46     /** Schroedinger frame format */
  47     SchroFrameFormat frame_format;
  48
  49     /** frame being encoded */
  50     AVFrame picture;
  51
  52     /** frame size */
  53     int frame_size;
  54
  55     /** Schroedinger encoder handle*/
  56     SchroEncoder* encoder;
  57
  58     /** buffer to store encoder output before writing it to the frame queue*/
  59     unsigned char *enc_buf;
  60
  61     /** Size of encoder buffer*/
  62     int enc_buf_size;
  63
  64     /** queue storing encoded frames */
  65     FFSchroQueue enc_frame_queue;
  66
  67     /** end of sequence signalled */
  68     int eos_signalled;
  69
  70     /** end of sequence pulled */
  71     int eos_pulled;
  72
  73     /* counter for frames submitted to encoder, used as dts */
  74     int64_t dts;
  75 } SchroEncoderParams;
  76
  77 /**
  78 * Works out Schro-compatible chroma format.
  79 */
  80 static int set_chroma_format(AVCodecContext *avccontext)
  81 {
  82     int num_formats = sizeof(schro_pixel_format_map) /
  83                       sizeof(schro_pixel_format_map[0]);
  84     int idx;
  85
  86     SchroEncoderParams *p_schro_params = avccontext->priv_data;
  87
  88     for (idx = 0; idx < num_formats; ++idx) {
  89         if (schro_pixel_format_map[idx].ff_pix_fmt ==
  90             avccontext->pix_fmt) {
  91             p_schro_params->format->chroma_format =
  92                             schro_pixel_format_map[idx].schro_pix_fmt;
  93             return 0;
  94         }
  95     }
  96
  97     av_log(avccontext, AV_LOG_ERROR,
  98            "This codec currently only supports planar YUV 4:2:0, 4:2:2"
  99            " and 4:4:4 formats.\n");
 100
 101     return -1;
 102 }
 103
 104 static int libschroedinger_encode_init(AVCodecContext *avccontext)
 105 {
 106     SchroEncoderParams *p_schro_params = avccontext->priv_data;
 107     SchroVideoFormatEnum preset;
 108
 109     /* Initialize the libraries that libschroedinger depends on. */
 110     schro_init();
 111
 112     /* Create an encoder object. */
 113     p_schro_params->encoder = schro_encoder_new();
 114
 115     if (!p_schro_params->encoder) {
 116         av_log(avccontext, AV_LOG_ERROR,
 117                "Unrecoverable Error: schro_encoder_new failed. ");
 118         return -1;
 119     }
 120
 121     /* Initialize the format. */
 122     preset = ff_get_schro_video_format_preset(avccontext);
 123     p_schro_params->format =
 124                     schro_encoder_get_video_format(p_schro_params->encoder);
 125     schro_video_format_set_std_video_format(p_schro_params->format, preset);
 126     p_schro_params->format->width  = avccontext->width;
 127     p_schro_params->format->height = avccontext->height;
 128
 129     if (set_chroma_format(avccontext) == -1)
 130         return -1;
 131
 132     if (avccontext->color_primaries == AVCOL_PRI_BT709) {
 133         p_schro_params->format->colour_primaries = SCHRO_COLOUR_PRIMARY_HDTV;
 134     } else if (avccontext->color_primaries == AVCOL_PRI_BT470BG) {
 135         p_schro_params->format->colour_primaries = SCHRO_COLOUR_PRIMARY_SDTV_625;
 136     } else if (avccontext->color_primaries == AVCOL_PRI_SMPTE170M) {
 137         p_schro_params->format->colour_primaries = SCHRO_COLOUR_PRIMARY_SDTV_525;
 138     }
 139
 140     if (avccontext->colorspace == AVCOL_SPC_BT709) {
 141         p_schro_params->format->colour_matrix = SCHRO_COLOUR_MATRIX_HDTV;
 142     } else if (avccontext->colorspace == AVCOL_SPC_BT470BG) {
 143         p_schro_params->format->colour_matrix = SCHRO_COLOUR_MATRIX_SDTV;
 144     }
 145
 146     if (avccontext->color_trc == AVCOL_TRC_BT709) {
 147         p_schro_params->format->transfer_function = SCHRO_TRANSFER_CHAR_TV_GAMMA;
 148     }
 149
 150     if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
 151                                   &p_schro_params->frame_format) == -1) {
 152         av_log(avccontext, AV_LOG_ERROR,
 153                "This codec currently supports only planar YUV 4:2:0, 4:2:2"
 154                " and 4:4:4 formats.\n");
 155         return -1;
 156     }
 157
 158     p_schro_params->format->frame_rate_numerator   = avccontext->time_base.den;
 159     p_schro_params->format->frame_rate_denominator = avccontext->time_base.num;
 160
 161     p_schro_params->frame_size = avpicture_get_size(avccontext->pix_fmt,
 162                                                     avccontext->width,
 163                                                     avccontext->height);
 164
 165     avccontext->coded_frame = &p_schro_params->picture;
 166
 167     if (!avccontext->gop_size) {
 168         schro_encoder_setting_set_double(p_schro_params->encoder,
 169                                          "gop_structure",
 170                                          SCHRO_ENCODER_GOP_INTRA_ONLY);
 171
 172         if (avccontext->coder_type == FF_CODER_TYPE_VLC)
 173             schro_encoder_setting_set_double(p_schro_params->encoder,
 174                                              "enable_noarith", 1);
 175     } else {
 176         schro_encoder_setting_set_double(p_schro_params->encoder,
 177                                          "au_distance", avccontext->gop_size);
 178         avccontext->has_b_frames = 1;
 179         p_schro_params->dts = -1;
 180     }
 181
 182     /* FIXME - Need to handle SCHRO_ENCODER_RATE_CONTROL_LOW_DELAY. */
 183     if (avccontext->flags & CODEC_FLAG_QSCALE) {
 184         if (!avccontext->global_quality) {
 185             /* lossless coding */
 186             schro_encoder_setting_set_double(p_schro_params->encoder,
 187                                              "rate_control",
 188                                              SCHRO_ENCODER_RATE_CONTROL_LOSSLESS);
 189         } else {
 190             int quality;
 191             schro_encoder_setting_set_double(p_schro_params->encoder,
 192                                              "rate_control",
 193                                              SCHRO_ENCODER_RATE_CONTROL_CONSTANT_QUALITY);
 194
 195             quality = avccontext->global_quality / FF_QP2LAMBDA;
 196             if (quality > 10)
 197                 quality = 10;
 198             schro_encoder_setting_set_double(p_schro_params->encoder,
 199                                              "quality", quality);
 200         }
 201     } else {
 202         schro_encoder_setting_set_double(p_schro_params->encoder,
 203                                          "rate_control",
 204                                          SCHRO_ENCODER_RATE_CONTROL_CONSTANT_BITRATE);
 205
 206         schro_encoder_setting_set_double(p_schro_params->encoder,
 207                                          "bitrate",
 208                                          avccontext->bit_rate);
 209
 210     }
 211
 212     if (avccontext->flags & CODEC_FLAG_INTERLACED_ME)
 213         /* All material can be coded as interlaced or progressive
 214            irrespective of the type of source material. */
 215         schro_encoder_setting_set_double(p_schro_params->encoder,
 216                                          "interlaced_coding", 1);
 217
 218     schro_encoder_setting_set_double(p_schro_params->encoder, "open_gop",
 219                                      !(avccontext->flags & CODEC_FLAG_CLOSED_GOP));
 220
 221     /* FIXME: Signal range hardcoded to 8-bit data until both libschroedinger
 222      * and libdirac support other bit-depth data. */
 223     schro_video_format_set_std_signal_range(p_schro_params->format,
 224                                             SCHRO_SIGNAL_RANGE_8BIT_VIDEO);
 225
 226     /* Set the encoder format. */
 227     schro_encoder_set_video_format(p_schro_params->encoder,
 228                                    p_schro_params->format);
 229
 230     /* Set the debug level. */
 231     schro_debug_set_level(avccontext->debug);
 232
 233     schro_encoder_start(p_schro_params->encoder);
 234
 235     /* Initialize the encoded frame queue. */
 236     ff_schro_queue_init(&p_schro_params->enc_frame_queue);
 237     return 0;
 238 }
 239
 240 static SchroFrame *libschroedinger_frame_from_data(AVCodecContext *avccontext,
 241                                                    const AVFrame *frame)
 242 {
 243     SchroEncoderParams *p_schro_params = avccontext->priv_data;
 244     SchroFrame *in_frame;
 245     /* Input line size may differ from what the codec supports. Especially
 246      * when transcoding from one format to another. So use avpicture_layout
 247      * to copy the frame. */
 248     in_frame = ff_create_schro_frame(avccontext, p_schro_params->frame_format);
 249
 250     if (in_frame)
 251         avpicture_layout((const AVPicture *)frame, avccontext->pix_fmt,
 252                           avccontext->width, avccontext->height,
 253                           in_frame->components[0].data,
 254                           p_schro_params->frame_size);
 255
 256     return in_frame;
 257 }
 258
 259 static void libschroedinger_free_frame(void *data)
 260 {
 261     FFSchroEncodedFrame *enc_frame = data;
 262
 263     av_freep(&enc_frame->p_encbuf);
 264     av_free(enc_frame);
 265 }
 266
 267 static int libschroedinger_encode_frame(AVCodecContext *avccontext, AVPacket *pkt,
 268                                         const AVFrame *frame, int *got_packet)
 269 {
 270     int enc_size = 0;
 271     SchroEncoderParams *p_schro_params = avccontext->priv_data;
 272     SchroEncoder *encoder = p_schro_params->encoder;
 273     struct FFSchroEncodedFrame *p_frame_output = NULL;
 274     int go = 1;
 275     SchroBuffer *enc_buf;
 276     int presentation_frame;
 277     int parse_code;
 278     int last_frame_in_sequence = 0;
 279     int pkt_size, ret;
 280
 281     if (!frame) {
 282         /* Push end of sequence if not already signalled. */
 283         if (!p_schro_params->eos_signalled) {
 284             schro_encoder_end_of_stream(encoder);
 285             p_schro_params->eos_signalled = 1;
 286         }
 287     } else {
 288         /* Allocate frame data to schro input buffer. */
 289         SchroFrame *in_frame = libschroedinger_frame_from_data(avccontext,
 290                                                                frame);
 291         /* Load next frame. */
 292         schro_encoder_push_frame(encoder, in_frame);
 293     }
 294
 295     if (p_schro_params->eos_pulled)
 296         go = 0;
 297
 298     /* Now check to see if we have any output from the encoder. */
 299     while (go) {
 300         SchroStateEnum state;
 301         state = schro_encoder_wait(encoder);
 302         switch (state) {
 303         case SCHRO_STATE_HAVE_BUFFER:
 304         case SCHRO_STATE_END_OF_STREAM:
 305             enc_buf = schro_encoder_pull(encoder, &presentation_frame);
 306             av_assert0(enc_buf->length > 0);
 307             parse_code = enc_buf->data[4];
 308
 309             /* All non-frame data is prepended to actual frame data to
 310              * be able to set the pts correctly. So we don't write data
 311              * to the frame output queue until we actually have a frame
 312              */
 313             p_schro_params->enc_buf = av_realloc(p_schro_params->enc_buf,
 314                                                  p_schro_params->enc_buf_size + enc_buf->length);
 315
 316             memcpy(p_schro_params->enc_buf + p_schro_params->enc_buf_size,
 317                    enc_buf->data, enc_buf->length);
 318             p_schro_params->enc_buf_size += enc_buf->length;
 319
 320
 321             if (state == SCHRO_STATE_END_OF_STREAM) {
 322                 p_schro_params->eos_pulled = 1;
 323                 go = 0;
 324             }
 325
 326             if (!SCHRO_PARSE_CODE_IS_PICTURE(parse_code)) {
 327                 schro_buffer_unref(enc_buf);
 328                 break;
 329             }
 330
 331             /* Create output frame. */
 332             p_frame_output = av_mallocz(sizeof(FFSchroEncodedFrame));
 333             /* Set output data. */
 334             p_frame_output->size     = p_schro_params->enc_buf_size;
 335             p_frame_output->p_encbuf = p_schro_params->enc_buf;
 336             if (SCHRO_PARSE_CODE_IS_INTRA(parse_code) &&
 337                 SCHRO_PARSE_CODE_IS_REFERENCE(parse_code))
 338                 p_frame_output->key_frame = 1;
 339
 340             /* Parse the coded frame number from the bitstream. Bytes 14
 341              * through 17 represesent the frame number. */
 342             p_frame_output->frame_num = AV_RB32(enc_buf->data + 13);
 343
 344             ff_schro_queue_push_back(&p_schro_params->enc_frame_queue,
 345                                      p_frame_output);
 346             p_schro_params->enc_buf_size = 0;
 347             p_schro_params->enc_buf      = NULL;
 348
 349             schro_buffer_unref(enc_buf);
 350
 351             break;
 352
 353         case SCHRO_STATE_NEED_FRAME:
 354             go = 0;
 355             break;
 356
 357         case SCHRO_STATE_AGAIN:
 358             break;
 359
 360         default:
 361             av_log(avccontext, AV_LOG_ERROR, "Unknown Schro Encoder state\n");
 362             return -1;
 363         }
 364     }
 365
 366     /* Copy 'next' frame in queue. */
 367
 368     if (p_schro_params->enc_frame_queue.size == 1 &&
 369         p_schro_params->eos_pulled)
 370         last_frame_in_sequence = 1;
 371
 372     p_frame_output = ff_schro_queue_pop(&p_schro_params->enc_frame_queue);
 373
 374     if (!p_frame_output)
 375         return 0;
 376
 377     pkt_size = p_frame_output->size;
 378     if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0)
 379         pkt_size += p_schro_params->enc_buf_size;
 380     if ((ret = ff_alloc_packet2(avccontext, pkt, pkt_size)) < 0)
 381         goto error;
 382
 383     memcpy(pkt->data, p_frame_output->p_encbuf, p_frame_output->size);
 384     avccontext->coded_frame->key_frame = p_frame_output->key_frame;
 385     /* Use the frame number of the encoded frame as the pts. It is OK to
 386      * do so since Dirac is a constant frame rate codec. It expects input
 387      * to be of constant frame rate. */
 388     pkt->pts =
 389     avccontext->coded_frame->pts = p_frame_output->frame_num;
 390     pkt->dts = p_schro_params->dts++;
 391     enc_size = p_frame_output->size;
 392
 393     /* Append the end of sequence information to the last frame in the
 394      * sequence. */
 395     if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0) {
 396         memcpy(pkt->data + enc_size, p_schro_params->enc_buf,
 397                p_schro_params->enc_buf_size);
 398         enc_size += p_schro_params->enc_buf_size;
 399         av_freep(&p_schro_params->enc_buf);
 400         p_schro_params->enc_buf_size = 0;
 401     }
 402
 403     if (p_frame_output->key_frame)
 404         pkt->flags |= AV_PKT_FLAG_KEY;
 405     *got_packet = 1;
 406
 407 error:
 408     /* free frame */
 409     libschroedinger_free_frame(p_frame_output);
 410     return ret;
 411 }
 412
 413
 414 static int libschroedinger_encode_close(AVCodecContext *avccontext)
 415 {
 416     SchroEncoderParams *p_schro_params = avccontext->priv_data;
 417
 418     /* Close the encoder. */
 419     schro_encoder_free(p_schro_params->encoder);
 420
 421     /* Free data in the output frame queue. */
 422     ff_schro_queue_free(&p_schro_params->enc_frame_queue,
 423                         libschroedinger_free_frame);
 424
 425
 426     /* Free the encoder buffer. */
 427     if (p_schro_params->enc_buf_size)
 428         av_freep(&p_schro_params->enc_buf);
 429
 430     /* Free the video format structure. */
 431     av_freep(&p_schro_params->format);
 432
 433     return 0;
 434 }
 435
 436
 437 AVCodec ff_libschroedinger_encoder = {
 438     .name           = "libschroedinger",
 439     .type           = AVMEDIA_TYPE_VIDEO,
 440     .id             = AV_CODEC_ID_DIRAC,
 441     .priv_data_size = sizeof(SchroEncoderParams),
 442     .init           = libschroedinger_encode_init,
 443     .encode2        = libschroedinger_encode_frame,
 444     .close          = libschroedinger_encode_close,
 445     .capabilities   = CODEC_CAP_DELAY,
 446     .pix_fmts       = (const enum PixelFormat[]){
 447         PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_NONE
 448     },
 449     .long_name      = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
 450 };