ffmpeg/libavutil/frame.c

   1 /*
   2  *
   3  * This file is part of FFmpeg.
   4  *
   5  * FFmpeg is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * FFmpeg is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with FFmpeg; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include "channel_layout.h"
  21 #include "avassert.h"
  22 #include "buffer.h"
  23 #include "common.h"
  24 #include "dict.h"
  25 #include "frame.h"
  26 #include "imgutils.h"
  27 #include "mem.h"
  28 #include "samplefmt.h"
  29
  30 MAKE_ACCESSORS(AVFrame, frame, int64_t, best_effort_timestamp)
  31 MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_duration)
  32 MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_pos)
  33 MAKE_ACCESSORS(AVFrame, frame, int64_t, channel_layout)
  34 MAKE_ACCESSORS(AVFrame, frame, int,     channels)
  35 MAKE_ACCESSORS(AVFrame, frame, int,     sample_rate)
  36 MAKE_ACCESSORS(AVFrame, frame, AVDictionary *, metadata)
  37 MAKE_ACCESSORS(AVFrame, frame, int,     decode_error_flags)
  38 MAKE_ACCESSORS(AVFrame, frame, int,     pkt_size)
  39 MAKE_ACCESSORS(AVFrame, frame, enum AVColorSpace, colorspace)
  40 MAKE_ACCESSORS(AVFrame, frame, enum AVColorRange, color_range)
  41
  42 #define CHECK_CHANNELS_CONSISTENCY(frame) \
  43     av_assert2(!(frame)->channel_layout || \
  44                (frame)->channels == \
  45                av_get_channel_layout_nb_channels((frame)->channel_layout))
  46
  47 AVDictionary **avpriv_frame_get_metadatap(AVFrame *frame) {return &frame->metadata;};
  48
  49 int av_frame_set_qp_table(AVFrame *f, AVBufferRef *buf, int stride, int qp_type)
  50 {
  51     av_buffer_unref(&f->qp_table_buf);
  52
  53     f->qp_table_buf = buf;
  54
  55     f->qscale_table = buf->data;
  56     f->qstride      = stride;
  57     f->qscale_type  = qp_type;
  58
  59     return 0;
  60 }
  61
  62 int8_t *av_frame_get_qp_table(AVFrame *f, int *stride, int *type)
  63 {
  64     *stride = f->qstride;
  65     *type   = f->qscale_type;
  66
  67     if (!f->qp_table_buf)
  68         return NULL;
  69
  70     return f->qp_table_buf->data;
  71 }
  72
  73 const char *av_get_colorspace_name(enum AVColorSpace val)
  74 {
  75     static const char * const name[] = {
  76         [AVCOL_SPC_RGB]       = "GBR",
  77         [AVCOL_SPC_BT709]     = "bt709",
  78         [AVCOL_SPC_FCC]       = "fcc",
  79         [AVCOL_SPC_BT470BG]   = "bt470bg",
  80         [AVCOL_SPC_SMPTE170M] = "smpte170m",
  81         [AVCOL_SPC_SMPTE240M] = "smpte240m",
  82         [AVCOL_SPC_YCOCG]     = "YCgCo",
  83     };
  84     if ((unsigned)val >= FF_ARRAY_ELEMS(name))
  85         return NULL;
  86     return name[val];
  87 }
  88
  89 static void get_frame_defaults(AVFrame *frame)
  90 {
  91     if (frame->extended_data != frame->data)
  92         av_freep(&frame->extended_data);
  93
  94     memset(frame, 0, sizeof(*frame));
  95
  96     frame->pts                   =
  97     frame->pkt_dts               =
  98     frame->pkt_pts               = AV_NOPTS_VALUE;
  99     av_frame_set_best_effort_timestamp(frame, AV_NOPTS_VALUE);
 100     av_frame_set_pkt_duration         (frame, 0);
 101     av_frame_set_pkt_pos              (frame, -1);
 102     av_frame_set_pkt_size             (frame, -1);
 103     frame->key_frame           = 1;
 104     frame->sample_aspect_ratio = (AVRational){ 0, 1 };
 105     frame->format              = -1; /* unknown */
 106     frame->extended_data       = frame->data;
 107     frame->color_primaries     = AVCOL_PRI_UNSPECIFIED;
 108     frame->color_trc           = AVCOL_TRC_UNSPECIFIED;
 109     frame->colorspace          = AVCOL_SPC_UNSPECIFIED;
 110     frame->color_range         = AVCOL_RANGE_UNSPECIFIED;
 111     frame->chroma_location     = AVCHROMA_LOC_UNSPECIFIED;
 112 }
 113
 114 static void free_side_data(AVFrameSideData **ptr_sd)
 115 {
 116     AVFrameSideData *sd = *ptr_sd;
 117
 118     av_freep(&sd->data);
 119     av_dict_free(&sd->metadata);
 120     av_freep(ptr_sd);
 121 }
 122
 123 AVFrame *av_frame_alloc(void)
 124 {
 125     AVFrame *frame = av_mallocz(sizeof(*frame));
 126
 127     if (!frame)
 128         return NULL;
 129
 130     frame->extended_data = NULL;
 131     get_frame_defaults(frame);
 132
 133     return frame;
 134 }
 135
 136 void av_frame_free(AVFrame **frame)
 137 {
 138     if (!frame || !*frame)
 139         return;
 140
 141     av_frame_unref(*frame);
 142     av_freep(frame);
 143 }
 144
 145 static int get_video_buffer(AVFrame *frame, int align)
 146 {
 147     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
 148     int ret, i;
 149
 150     if (!desc)
 151         return AVERROR(EINVAL);
 152
 153     if ((ret = av_image_check_size(frame->width, frame->height, 0, NULL)) < 0)
 154         return ret;
 155
 156     if (!frame->linesize[0]) {
 157         for(i=1; i<=align; i+=i) {
 158             ret = av_image_fill_linesizes(frame->linesize, frame->format,
 159                                           FFALIGN(frame->width, i));
 160             if (ret < 0)
 161                 return ret;
 162             if (!(frame->linesize[0] & (align-1)))
 163                 break;
 164         }
 165
 166         for (i = 0; i < 4 && frame->linesize[i]; i++)
 167             frame->linesize[i] = FFALIGN(frame->linesize[i], align);
 168     }
 169
 170     for (i = 0; i < 4 && frame->linesize[i]; i++) {
 171         int h = FFALIGN(frame->height, 32);
 172         if (i == 1 || i == 2)
 173             h = FF_CEIL_RSHIFT(h, desc->log2_chroma_h);
 174
 175         frame->buf[i] = av_buffer_alloc(frame->linesize[i] * h + 16 + 16/*STRIDE_ALIGN*/ - 1);
 176         if (!frame->buf[i])
 177             goto fail;
 178
 179         frame->data[i] = frame->buf[i]->data;
 180     }
 181     if (desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
 182         av_buffer_unref(&frame->buf[1]);
 183         frame->buf[1] = av_buffer_alloc(1024);
 184         if (!frame->buf[1])
 185             goto fail;
 186         frame->data[1] = frame->buf[1]->data;
 187     }
 188
 189     frame->extended_data = frame->data;
 190
 191     return 0;
 192 fail:
 193     av_frame_unref(frame);
 194     return AVERROR(ENOMEM);
 195 }
 196
 197 static int get_audio_buffer(AVFrame *frame, int align)
 198 {
 199     int channels;
 200     int planar   = av_sample_fmt_is_planar(frame->format);
 201     int planes;
 202     int ret, i;
 203
 204     if (!frame->channels)
 205         frame->channels = av_get_channel_layout_nb_channels(frame->channel_layout);
 206
 207     channels = frame->channels;
 208     planes = planar ? channels : 1;
 209
 210     CHECK_CHANNELS_CONSISTENCY(frame);
 211     if (!frame->linesize[0]) {
 212         ret = av_samples_get_buffer_size(&frame->linesize[0], channels,
 213                                          frame->nb_samples, frame->format,
 214                                          align);
 215         if (ret < 0)
 216             return ret;
 217     }
 218
 219     if (planes > AV_NUM_DATA_POINTERS) {
 220         frame->extended_data = av_mallocz_array(planes,
 221                                           sizeof(*frame->extended_data));
 222         frame->extended_buf  = av_mallocz_array((planes - AV_NUM_DATA_POINTERS),
 223                                           sizeof(*frame->extended_buf));
 224         if (!frame->extended_data || !frame->extended_buf) {
 225             av_freep(&frame->extended_data);
 226             av_freep(&frame->extended_buf);
 227             return AVERROR(ENOMEM);
 228         }
 229         frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
 230     } else
 231         frame->extended_data = frame->data;
 232
 233     for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
 234         frame->buf[i] = av_buffer_alloc(frame->linesize[0]);
 235         if (!frame->buf[i]) {
 236             av_frame_unref(frame);
 237             return AVERROR(ENOMEM);
 238         }
 239         frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
 240     }
 241     for (i = 0; i < planes - AV_NUM_DATA_POINTERS; i++) {
 242         frame->extended_buf[i] = av_buffer_alloc(frame->linesize[0]);
 243         if (!frame->extended_buf[i]) {
 244             av_frame_unref(frame);
 245             return AVERROR(ENOMEM);
 246         }
 247         frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
 248     }
 249     return 0;
 250
 251 }
 252
 253 int av_frame_get_buffer(AVFrame *frame, int align)
 254 {
 255     if (frame->format < 0)
 256         return AVERROR(EINVAL);
 257
 258     if (frame->width > 0 && frame->height > 0)
 259         return get_video_buffer(frame, align);
 260     else if (frame->nb_samples > 0 && (frame->channel_layout || frame->channels > 0))
 261         return get_audio_buffer(frame, align);
 262
 263     return AVERROR(EINVAL);
 264 }
 265
 266 int av_frame_ref(AVFrame *dst, const AVFrame *src)
 267 {
 268     int i, ret = 0;
 269
 270     dst->format         = src->format;
 271     dst->width          = src->width;
 272     dst->height         = src->height;
 273     dst->channels       = src->channels;
 274     dst->channel_layout = src->channel_layout;
 275     dst->nb_samples     = src->nb_samples;
 276
 277     ret = av_frame_copy_props(dst, src);
 278     if (ret < 0)
 279         return ret;
 280
 281     /* duplicate the frame data if it's not refcounted */
 282     if (!src->buf[0]) {
 283         ret = av_frame_get_buffer(dst, 32);
 284         if (ret < 0)
 285             return ret;
 286
 287         ret = av_frame_copy(dst, src);
 288         if (ret < 0)
 289             av_frame_unref(dst);
 290
 291         return ret;
 292     }
 293
 294     /* ref the buffers */
 295     for (i = 0; i < FF_ARRAY_ELEMS(src->buf); i++) {
 296         if (!src->buf[i])
 297             continue;
 298         dst->buf[i] = av_buffer_ref(src->buf[i]);
 299         if (!dst->buf[i]) {
 300             ret = AVERROR(ENOMEM);
 301             goto fail;
 302         }
 303     }
 304
 305     if (src->extended_buf) {
 306         dst->extended_buf = av_mallocz_array(sizeof(*dst->extended_buf),
 307                                        src->nb_extended_buf);
 308         if (!dst->extended_buf) {
 309             ret = AVERROR(ENOMEM);
 310             goto fail;
 311         }
 312         dst->nb_extended_buf = src->nb_extended_buf;
 313
 314         for (i = 0; i < src->nb_extended_buf; i++) {
 315             dst->extended_buf[i] = av_buffer_ref(src->extended_buf[i]);
 316             if (!dst->extended_buf[i]) {
 317                 ret = AVERROR(ENOMEM);
 318                 goto fail;
 319             }
 320         }
 321     }
 322
 323     /* duplicate extended data */
 324     if (src->extended_data != src->data) {
 325         int ch = src->channels;
 326
 327         if (!ch) {
 328             ret = AVERROR(EINVAL);
 329             goto fail;
 330         }
 331         CHECK_CHANNELS_CONSISTENCY(src);
 332
 333         dst->extended_data = av_malloc_array(sizeof(*dst->extended_data), ch);
 334         if (!dst->extended_data) {
 335             ret = AVERROR(ENOMEM);
 336             goto fail;
 337         }
 338         memcpy(dst->extended_data, src->extended_data, sizeof(*src->extended_data) * ch);
 339     } else
 340         dst->extended_data = dst->data;
 341
 342     memcpy(dst->data,     src->data,     sizeof(src->data));
 343     memcpy(dst->linesize, src->linesize, sizeof(src->linesize));
 344
 345     return 0;
 346
 347 fail:
 348     av_frame_unref(dst);
 349     return ret;
 350 }
 351
 352 AVFrame *av_frame_clone(const AVFrame *src)
 353 {
 354     AVFrame *ret = av_frame_alloc();
 355
 356     if (!ret)
 357         return NULL;
 358
 359     if (av_frame_ref(ret, src) < 0)
 360         av_frame_free(&ret);
 361
 362     return ret;
 363 }
 364
 365 void av_frame_unref(AVFrame *frame)
 366 {
 367     int i;
 368
 369     for (i = 0; i < frame->nb_side_data; i++) {
 370         free_side_data(&frame->side_data[i]);
 371     }
 372     av_freep(&frame->side_data);
 373
 374     for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
 375         av_buffer_unref(&frame->buf[i]);
 376     for (i = 0; i < frame->nb_extended_buf; i++)
 377         av_buffer_unref(&frame->extended_buf[i]);
 378     av_freep(&frame->extended_buf);
 379     av_dict_free(&frame->metadata);
 380     av_buffer_unref(&frame->qp_table_buf);
 381
 382     get_frame_defaults(frame);
 383 }
 384
 385 void av_frame_move_ref(AVFrame *dst, AVFrame *src)
 386 {
 387     *dst = *src;
 388     if (src->extended_data == src->data)
 389         dst->extended_data = dst->data;
 390     memset(src, 0, sizeof(*src));
 391     get_frame_defaults(src);
 392 }
 393
 394 int av_frame_is_writable(AVFrame *frame)
 395 {
 396     int i, ret = 1;
 397
 398     /* assume non-refcounted frames are not writable */
 399     if (!frame->buf[0])
 400         return 0;
 401
 402     for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
 403         if (frame->buf[i])
 404             ret &= !!av_buffer_is_writable(frame->buf[i]);
 405     for (i = 0; i < frame->nb_extended_buf; i++)
 406         ret &= !!av_buffer_is_writable(frame->extended_buf[i]);
 407
 408     return ret;
 409 }
 410
 411 int av_frame_make_writable(AVFrame *frame)
 412 {
 413     AVFrame tmp;
 414     int ret;
 415
 416     if (!frame->buf[0])
 417         return AVERROR(EINVAL);
 418
 419     if (av_frame_is_writable(frame))
 420         return 0;
 421
 422     memset(&tmp, 0, sizeof(tmp));
 423     tmp.format         = frame->format;
 424     tmp.width          = frame->width;
 425     tmp.height         = frame->height;
 426     tmp.channels       = frame->channels;
 427     tmp.channel_layout = frame->channel_layout;
 428     tmp.nb_samples     = frame->nb_samples;
 429     ret = av_frame_get_buffer(&tmp, 32);
 430     if (ret < 0)
 431         return ret;
 432
 433     ret = av_frame_copy(&tmp, frame);
 434     if (ret < 0) {
 435         av_frame_unref(&tmp);
 436         return ret;
 437     }
 438
 439     ret = av_frame_copy_props(&tmp, frame);
 440     if (ret < 0) {
 441         av_frame_unref(&tmp);
 442         return ret;
 443     }
 444
 445     av_frame_unref(frame);
 446
 447     *frame = tmp;
 448     if (tmp.data == tmp.extended_data)
 449         frame->extended_data = frame->data;
 450
 451     return 0;
 452 }
 453
 454 int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
 455 {
 456     int i;
 457
 458     dst->key_frame              = src->key_frame;
 459     dst->pict_type              = src->pict_type;
 460     dst->sample_aspect_ratio    = src->sample_aspect_ratio;
 461     dst->pts                    = src->pts;
 462     dst->repeat_pict            = src->repeat_pict;
 463     dst->interlaced_frame       = src->interlaced_frame;
 464     dst->top_field_first        = src->top_field_first;
 465     dst->palette_has_changed    = src->palette_has_changed;
 466     dst->sample_rate            = src->sample_rate;
 467     dst->opaque                 = src->opaque;
 468 #if FF_API_AVFRAME_LAVC
 469     dst->type                   = src->type;
 470 #endif
 471     dst->pkt_pts                = src->pkt_pts;
 472     dst->pkt_dts                = src->pkt_dts;
 473     dst->pkt_pos                = src->pkt_pos;
 474     dst->pkt_size               = src->pkt_size;
 475     dst->pkt_duration           = src->pkt_duration;
 476     dst->reordered_opaque       = src->reordered_opaque;
 477     dst->quality                = src->quality;
 478     dst->best_effort_timestamp  = src->best_effort_timestamp;
 479     dst->coded_picture_number   = src->coded_picture_number;
 480     dst->display_picture_number = src->display_picture_number;
 481     dst->flags                  = src->flags;
 482     dst->decode_error_flags     = src->decode_error_flags;
 483     dst->color_primaries        = src->color_primaries;
 484     dst->color_trc              = src->color_trc;
 485     dst->colorspace             = src->colorspace;
 486     dst->color_range            = src->color_range;
 487     dst->chroma_location        = src->chroma_location;
 488
 489     av_dict_copy(&dst->metadata, src->metadata, 0);
 490
 491     memcpy(dst->error, src->error, sizeof(dst->error));
 492
 493     for (i = 0; i < src->nb_side_data; i++) {
 494         const AVFrameSideData *sd_src = src->side_data[i];
 495         AVFrameSideData *sd_dst;
 496         if (   sd_src->type == AV_FRAME_DATA_PANSCAN
 497             && (src->width != dst->width || src->height != dst->height))
 498             continue;
 499         sd_dst = av_frame_new_side_data(dst, sd_src->type,
 500                                                          sd_src->size);
 501         if (!sd_dst) {
 502             for (i = 0; i < dst->nb_side_data; i++) {
 503                 free_side_data(&dst->side_data[i]);
 504             }
 505             av_freep(&dst->side_data);
 506             return AVERROR(ENOMEM);
 507         }
 508         memcpy(sd_dst->data, sd_src->data, sd_src->size);
 509         av_dict_copy(&sd_dst->metadata, sd_src->metadata, 0);
 510     }
 511
 512     dst->qscale_table = NULL;
 513     dst->qstride      = 0;
 514     dst->qscale_type  = 0;
 515     if (src->qp_table_buf) {
 516         dst->qp_table_buf = av_buffer_ref(src->qp_table_buf);
 517         if (dst->qp_table_buf) {
 518             dst->qscale_table = dst->qp_table_buf->data;
 519             dst->qstride      = src->qstride;
 520             dst->qscale_type  = src->qscale_type;
 521         }
 522     }
 523
 524     return 0;
 525 }
 526
 527 AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane)
 528 {
 529     uint8_t *data;
 530     int planes, i;
 531
 532     if (frame->nb_samples) {
 533         int channels = frame->channels;
 534         if (!channels)
 535             return NULL;
 536         CHECK_CHANNELS_CONSISTENCY(frame);
 537         planes = av_sample_fmt_is_planar(frame->format) ? channels : 1;
 538     } else
 539         planes = 4;
 540
 541     if (plane < 0 || plane >= planes || !frame->extended_data[plane])
 542         return NULL;
 543     data = frame->extended_data[plane];
 544
 545     for (i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++) {
 546         AVBufferRef *buf = frame->buf[i];
 547         if (data >= buf->data && data < buf->data + buf->size)
 548             return buf;
 549     }
 550     for (i = 0; i < frame->nb_extended_buf; i++) {
 551         AVBufferRef *buf = frame->extended_buf[i];
 552         if (data >= buf->data && data < buf->data + buf->size)
 553             return buf;
 554     }
 555     return NULL;
 556 }
 557
 558 AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
 559                                         enum AVFrameSideDataType type,
 560                                         int size)
 561 {
 562     AVFrameSideData *ret, **tmp;
 563
 564     if (frame->nb_side_data > INT_MAX / sizeof(*frame->side_data) - 1)
 565         return NULL;
 566
 567     tmp = av_realloc(frame->side_data,
 568                      (frame->nb_side_data + 1) * sizeof(*frame->side_data));
 569     if (!tmp)
 570         return NULL;
 571     frame->side_data = tmp;
 572
 573     ret = av_mallocz(sizeof(*ret));
 574     if (!ret)
 575         return NULL;
 576
 577     ret->data = av_malloc(size);
 578     if (!ret->data) {
 579         av_freep(&ret);
 580         return NULL;
 581     }
 582
 583     ret->size = size;
 584     ret->type = type;
 585
 586     frame->side_data[frame->nb_side_data++] = ret;
 587
 588     return ret;
 589 }
 590
 591 AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
 592                                         enum AVFrameSideDataType type)
 593 {
 594     int i;
 595
 596     for (i = 0; i < frame->nb_side_data; i++) {
 597         if (frame->side_data[i]->type == type)
 598             return frame->side_data[i];
 599     }
 600     return NULL;
 601 }
 602
 603 static int frame_copy_video(AVFrame *dst, const AVFrame *src)
 604 {
 605     const uint8_t *src_data[4];
 606     int i, planes;
 607
 608     if (dst->width  < src->width ||
 609         dst->height < src->height)
 610         return AVERROR(EINVAL);
 611
 612     planes = av_pix_fmt_count_planes(dst->format);
 613     for (i = 0; i < planes; i++)
 614         if (!dst->data[i] || !src->data[i])
 615             return AVERROR(EINVAL);
 616
 617     memcpy(src_data, src->data, sizeof(src_data));
 618     av_image_copy(dst->data, dst->linesize,
 619                   src_data, src->linesize,
 620                   dst->format, src->width, src->height);
 621
 622     return 0;
 623 }
 624
 625 static int frame_copy_audio(AVFrame *dst, const AVFrame *src)
 626 {
 627     int planar   = av_sample_fmt_is_planar(dst->format);
 628     int channels = dst->channels;
 629     int planes   = planar ? channels : 1;
 630     int i;
 631
 632     if (dst->nb_samples     != src->nb_samples ||
 633         dst->channels       != src->channels ||
 634         dst->channel_layout != src->channel_layout)
 635         return AVERROR(EINVAL);
 636
 637     CHECK_CHANNELS_CONSISTENCY(src);
 638
 639     for (i = 0; i < planes; i++)
 640         if (!dst->extended_data[i] || !src->extended_data[i])
 641             return AVERROR(EINVAL);
 642
 643     av_samples_copy(dst->extended_data, src->extended_data, 0, 0,
 644                     dst->nb_samples, channels, dst->format);
 645
 646     return 0;
 647 }
 648
 649 int av_frame_copy(AVFrame *dst, const AVFrame *src)
 650 {
 651     if (dst->format != src->format || dst->format < 0)
 652         return AVERROR(EINVAL);
 653
 654     if (dst->width > 0 && dst->height > 0)
 655         return frame_copy_video(dst, src);
 656     else if (dst->nb_samples > 0 && dst->channel_layout)
 657         return frame_copy_audio(dst, src);
 658
 659     return AVERROR(EINVAL);
 660 }
 661
 662 void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type)
 663 {
 664     int i;
 665
 666     for (i = 0; i < frame->nb_side_data; i++) {
 667         AVFrameSideData *sd = frame->side_data[i];
 668         if (sd->type == type) {
 669             free_side_data(&frame->side_data[i]);
 670             frame->side_data[i] = frame->side_data[frame->nb_side_data - 1];
 671             frame->nb_side_data--;
 672         }
 673     }
 674 }
 675
 676 const char *av_frame_side_data_name(enum AVFrameSideDataType type)
 677 {
 678     switch(type) {
 679     case AV_FRAME_DATA_PANSCAN:         return "AVPanScan";
 680     case AV_FRAME_DATA_A53_CC:          return "ATSC A53 Part 4 Closed Captions";
 681     case AV_FRAME_DATA_STEREO3D:        return "Stereoscopic 3d metadata";
 682     case AV_FRAME_DATA_MATRIXENCODING:  return "AVMatrixEncoding";
 683     case AV_FRAME_DATA_DOWNMIX_INFO:    return "Metadata relevant to a downmix procedure";
 684     case AV_FRAME_DATA_REPLAYGAIN:      return "AVReplayGain";
 685     case AV_FRAME_DATA_DISPLAYMATRIX:   return "3x3 displaymatrix";
 686     case AV_FRAME_DATA_MOTION_VECTORS:  return "Motion vectors";
 687     }
 688     return NULL;
 689 }