2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #include "channel_layout.h"
27 #include "samplefmt.h"
28 #include "hwcontext.h"
30 #if FF_API_FRAME_GET_SET
31 MAKE_ACCESSORS(AVFrame, frame, int64_t, best_effort_timestamp)
32 MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_duration)
33 MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_pos)
34 MAKE_ACCESSORS(AVFrame, frame, int64_t, channel_layout)
35 MAKE_ACCESSORS(AVFrame, frame, int, channels)
36 MAKE_ACCESSORS(AVFrame, frame, int, sample_rate)
37 MAKE_ACCESSORS(AVFrame, frame, AVDictionary *, metadata)
38 MAKE_ACCESSORS(AVFrame, frame, int, decode_error_flags)
39 MAKE_ACCESSORS(AVFrame, frame, int, pkt_size)
40 MAKE_ACCESSORS(AVFrame, frame, enum AVColorSpace, colorspace)
41 MAKE_ACCESSORS(AVFrame, frame, enum AVColorRange, color_range)
44 #define CHECK_CHANNELS_CONSISTENCY(frame) \
45 av_assert2(!(frame)->channel_layout || \
46 (frame)->channels == \
47 av_get_channel_layout_nb_channels((frame)->channel_layout))
49 #if FF_API_COLORSPACE_NAME
50 const char *av_get_colorspace_name(enum AVColorSpace val)
52 static const char * const name[] = {
53 [AVCOL_SPC_RGB] = "GBR",
54 [AVCOL_SPC_BT709] = "bt709",
55 [AVCOL_SPC_FCC] = "fcc",
56 [AVCOL_SPC_BT470BG] = "bt470bg",
57 [AVCOL_SPC_SMPTE170M] = "smpte170m",
58 [AVCOL_SPC_SMPTE240M] = "smpte240m",
59 [AVCOL_SPC_YCOCG] = "YCgCo",
61 if ((unsigned)val >= FF_ARRAY_ELEMS(name))
66 static void get_frame_defaults(AVFrame *frame)
68 if (frame->extended_data != frame->data)
69 av_freep(&frame->extended_data);
71 memset(frame, 0, sizeof(*frame));
74 frame->pkt_dts = AV_NOPTS_VALUE;
75 frame->best_effort_timestamp = AV_NOPTS_VALUE;
76 frame->pkt_duration = 0;
80 frame->sample_aspect_ratio = (AVRational){ 0, 1 };
81 frame->format = -1; /* unknown */
82 frame->extended_data = frame->data;
83 frame->color_primaries = AVCOL_PRI_UNSPECIFIED;
84 frame->color_trc = AVCOL_TRC_UNSPECIFIED;
85 frame->colorspace = AVCOL_SPC_UNSPECIFIED;
86 frame->color_range = AVCOL_RANGE_UNSPECIFIED;
87 frame->chroma_location = AVCHROMA_LOC_UNSPECIFIED;
91 static void free_side_data(AVFrameSideData **ptr_sd)
93 AVFrameSideData *sd = *ptr_sd;
95 av_buffer_unref(&sd->buf);
96 av_dict_free(&sd->metadata);
100 static void wipe_side_data(AVFrame *frame)
104 for (i = 0; i < frame->nb_side_data; i++) {
105 free_side_data(&frame->side_data[i]);
107 frame->nb_side_data = 0;
109 av_freep(&frame->side_data);
112 AVFrame *av_frame_alloc(void)
114 AVFrame *frame = av_mallocz(sizeof(*frame));
119 frame->extended_data = NULL;
120 get_frame_defaults(frame);
125 void av_frame_free(AVFrame **frame)
127 if (!frame || !*frame)
130 av_frame_unref(*frame);
134 static int get_video_buffer(AVFrame *frame, int align)
136 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
137 int ret, i, padded_height, total_size;
138 int plane_padding = FFMAX(16 + 16/*STRIDE_ALIGN*/, align);
139 ptrdiff_t linesizes[4];
143 return AVERROR(EINVAL);
145 if ((ret = av_image_check_size(frame->width, frame->height, 0, NULL)) < 0)
148 if (!frame->linesize[0]) {
150 align = 32; /* STRIDE_ALIGN. Should be av_cpu_max_align() */
152 for(i=1; i<=align; i+=i) {
153 ret = av_image_fill_linesizes(frame->linesize, frame->format,
154 FFALIGN(frame->width, i));
157 if (!(frame->linesize[0] & (align-1)))
161 for (i = 0; i < 4 && frame->linesize[i]; i++)
162 frame->linesize[i] = FFALIGN(frame->linesize[i], align);
165 for (i = 0; i < 4; i++)
166 linesizes[i] = frame->linesize[i];
168 padded_height = FFALIGN(frame->height, 32);
169 if ((ret = av_image_fill_plane_sizes(sizes, frame->format,
170 padded_height, linesizes)) < 0)
173 total_size = 4*plane_padding;
174 for (i = 0; i < 4; i++) {
175 if (sizes[i] > INT_MAX - total_size)
176 return AVERROR(EINVAL);
177 total_size += sizes[i];
180 frame->buf[0] = av_buffer_alloc(total_size);
181 if (!frame->buf[0]) {
182 ret = AVERROR(ENOMEM);
186 if ((ret = av_image_fill_pointers(frame->data, frame->format, padded_height,
187 frame->buf[0]->data, frame->linesize)) < 0)
190 for (i = 1; i < 4; i++) {
192 frame->data[i] += i * plane_padding;
195 frame->extended_data = frame->data;
199 av_frame_unref(frame);
203 static int get_audio_buffer(AVFrame *frame, int align)
206 int planar = av_sample_fmt_is_planar(frame->format);
210 if (!frame->channels)
211 frame->channels = av_get_channel_layout_nb_channels(frame->channel_layout);
213 channels = frame->channels;
214 planes = planar ? channels : 1;
216 CHECK_CHANNELS_CONSISTENCY(frame);
217 if (!frame->linesize[0]) {
218 ret = av_samples_get_buffer_size(&frame->linesize[0], channels,
219 frame->nb_samples, frame->format,
225 if (planes > AV_NUM_DATA_POINTERS) {
226 frame->extended_data = av_mallocz_array(planes,
227 sizeof(*frame->extended_data));
228 frame->extended_buf = av_mallocz_array((planes - AV_NUM_DATA_POINTERS),
229 sizeof(*frame->extended_buf));
230 if (!frame->extended_data || !frame->extended_buf) {
231 av_freep(&frame->extended_data);
232 av_freep(&frame->extended_buf);
233 return AVERROR(ENOMEM);
235 frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
237 frame->extended_data = frame->data;
239 for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
240 frame->buf[i] = av_buffer_alloc(frame->linesize[0]);
241 if (!frame->buf[i]) {
242 av_frame_unref(frame);
243 return AVERROR(ENOMEM);
245 frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
247 for (i = 0; i < planes - AV_NUM_DATA_POINTERS; i++) {
248 frame->extended_buf[i] = av_buffer_alloc(frame->linesize[0]);
249 if (!frame->extended_buf[i]) {
250 av_frame_unref(frame);
251 return AVERROR(ENOMEM);
253 frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
259 int av_frame_get_buffer(AVFrame *frame, int align)
261 if (frame->format < 0)
262 return AVERROR(EINVAL);
264 if (frame->width > 0 && frame->height > 0)
265 return get_video_buffer(frame, align);
266 else if (frame->nb_samples > 0 && (frame->channel_layout || frame->channels > 0))
267 return get_audio_buffer(frame, align);
269 return AVERROR(EINVAL);
272 static int frame_copy_props(AVFrame *dst, const AVFrame *src, int force_copy)
276 dst->key_frame = src->key_frame;
277 dst->pict_type = src->pict_type;
278 dst->sample_aspect_ratio = src->sample_aspect_ratio;
279 dst->crop_top = src->crop_top;
280 dst->crop_bottom = src->crop_bottom;
281 dst->crop_left = src->crop_left;
282 dst->crop_right = src->crop_right;
284 dst->repeat_pict = src->repeat_pict;
285 dst->interlaced_frame = src->interlaced_frame;
286 dst->top_field_first = src->top_field_first;
287 dst->palette_has_changed = src->palette_has_changed;
288 dst->sample_rate = src->sample_rate;
289 dst->opaque = src->opaque;
290 dst->pkt_dts = src->pkt_dts;
291 dst->pkt_pos = src->pkt_pos;
292 dst->pkt_size = src->pkt_size;
293 dst->pkt_duration = src->pkt_duration;
294 dst->reordered_opaque = src->reordered_opaque;
295 dst->quality = src->quality;
296 dst->best_effort_timestamp = src->best_effort_timestamp;
297 dst->coded_picture_number = src->coded_picture_number;
298 dst->display_picture_number = src->display_picture_number;
299 dst->flags = src->flags;
300 dst->decode_error_flags = src->decode_error_flags;
301 dst->color_primaries = src->color_primaries;
302 dst->color_trc = src->color_trc;
303 dst->colorspace = src->colorspace;
304 dst->color_range = src->color_range;
305 dst->chroma_location = src->chroma_location;
307 av_dict_copy(&dst->metadata, src->metadata, 0);
309 for (i = 0; i < src->nb_side_data; i++) {
310 const AVFrameSideData *sd_src = src->side_data[i];
311 AVFrameSideData *sd_dst;
312 if ( sd_src->type == AV_FRAME_DATA_PANSCAN
313 && (src->width != dst->width || src->height != dst->height))
316 sd_dst = av_frame_new_side_data(dst, sd_src->type,
320 return AVERROR(ENOMEM);
322 memcpy(sd_dst->data, sd_src->data, sd_src->size);
324 AVBufferRef *ref = av_buffer_ref(sd_src->buf);
325 sd_dst = av_frame_new_side_data_from_buf(dst, sd_src->type, ref);
327 av_buffer_unref(&ref);
329 return AVERROR(ENOMEM);
332 av_dict_copy(&sd_dst->metadata, sd_src->metadata, 0);
335 ret = av_buffer_replace(&dst->opaque_ref, src->opaque_ref);
336 ret |= av_buffer_replace(&dst->private_ref, src->private_ref);
340 int av_frame_ref(AVFrame *dst, const AVFrame *src)
344 av_assert1(dst->width == 0 && dst->height == 0);
345 av_assert1(dst->channels == 0);
347 dst->format = src->format;
348 dst->width = src->width;
349 dst->height = src->height;
350 dst->channels = src->channels;
351 dst->channel_layout = src->channel_layout;
352 dst->nb_samples = src->nb_samples;
354 ret = frame_copy_props(dst, src, 0);
358 /* duplicate the frame data if it's not refcounted */
360 ret = av_frame_get_buffer(dst, 0);
364 ret = av_frame_copy(dst, src);
371 /* ref the buffers */
372 for (i = 0; i < FF_ARRAY_ELEMS(src->buf); i++) {
375 dst->buf[i] = av_buffer_ref(src->buf[i]);
377 ret = AVERROR(ENOMEM);
382 if (src->extended_buf) {
383 dst->extended_buf = av_mallocz_array(sizeof(*dst->extended_buf),
384 src->nb_extended_buf);
385 if (!dst->extended_buf) {
386 ret = AVERROR(ENOMEM);
389 dst->nb_extended_buf = src->nb_extended_buf;
391 for (i = 0; i < src->nb_extended_buf; i++) {
392 dst->extended_buf[i] = av_buffer_ref(src->extended_buf[i]);
393 if (!dst->extended_buf[i]) {
394 ret = AVERROR(ENOMEM);
400 if (src->hw_frames_ctx) {
401 dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
402 if (!dst->hw_frames_ctx) {
403 ret = AVERROR(ENOMEM);
408 /* duplicate extended data */
409 if (src->extended_data != src->data) {
410 int ch = src->channels;
413 ret = AVERROR(EINVAL);
416 CHECK_CHANNELS_CONSISTENCY(src);
418 dst->extended_data = av_malloc_array(sizeof(*dst->extended_data), ch);
419 if (!dst->extended_data) {
420 ret = AVERROR(ENOMEM);
423 memcpy(dst->extended_data, src->extended_data, sizeof(*src->extended_data) * ch);
425 dst->extended_data = dst->data;
427 memcpy(dst->data, src->data, sizeof(src->data));
428 memcpy(dst->linesize, src->linesize, sizeof(src->linesize));
437 AVFrame *av_frame_clone(const AVFrame *src)
439 AVFrame *ret = av_frame_alloc();
444 if (av_frame_ref(ret, src) < 0)
450 void av_frame_unref(AVFrame *frame)
457 wipe_side_data(frame);
459 for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
460 av_buffer_unref(&frame->buf[i]);
461 for (i = 0; i < frame->nb_extended_buf; i++)
462 av_buffer_unref(&frame->extended_buf[i]);
463 av_freep(&frame->extended_buf);
464 av_dict_free(&frame->metadata);
466 av_buffer_unref(&frame->hw_frames_ctx);
468 av_buffer_unref(&frame->opaque_ref);
469 av_buffer_unref(&frame->private_ref);
471 get_frame_defaults(frame);
474 void av_frame_move_ref(AVFrame *dst, AVFrame *src)
476 av_assert1(dst->width == 0 && dst->height == 0);
477 av_assert1(dst->channels == 0);
480 if (src->extended_data == src->data)
481 dst->extended_data = dst->data;
482 memset(src, 0, sizeof(*src));
483 get_frame_defaults(src);
486 int av_frame_is_writable(AVFrame *frame)
490 /* assume non-refcounted frames are not writable */
494 for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
496 ret &= !!av_buffer_is_writable(frame->buf[i]);
497 for (i = 0; i < frame->nb_extended_buf; i++)
498 ret &= !!av_buffer_is_writable(frame->extended_buf[i]);
503 int av_frame_make_writable(AVFrame *frame)
509 return AVERROR(EINVAL);
511 if (av_frame_is_writable(frame))
514 memset(&tmp, 0, sizeof(tmp));
515 tmp.format = frame->format;
516 tmp.width = frame->width;
517 tmp.height = frame->height;
518 tmp.channels = frame->channels;
519 tmp.channel_layout = frame->channel_layout;
520 tmp.nb_samples = frame->nb_samples;
522 if (frame->hw_frames_ctx)
523 ret = av_hwframe_get_buffer(frame->hw_frames_ctx, &tmp, 0);
525 ret = av_frame_get_buffer(&tmp, 0);
529 ret = av_frame_copy(&tmp, frame);
531 av_frame_unref(&tmp);
535 ret = av_frame_copy_props(&tmp, frame);
537 av_frame_unref(&tmp);
541 av_frame_unref(frame);
544 if (tmp.data == tmp.extended_data)
545 frame->extended_data = frame->data;
550 int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
552 return frame_copy_props(dst, src, 1);
555 AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane)
560 if (frame->nb_samples) {
561 int channels = frame->channels;
564 CHECK_CHANNELS_CONSISTENCY(frame);
565 planes = av_sample_fmt_is_planar(frame->format) ? channels : 1;
569 if (plane < 0 || plane >= planes || !frame->extended_data[plane])
571 data = frame->extended_data[plane];
573 for (i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++) {
574 AVBufferRef *buf = frame->buf[i];
575 if (data >= buf->data && data < buf->data + buf->size)
578 for (i = 0; i < frame->nb_extended_buf; i++) {
579 AVBufferRef *buf = frame->extended_buf[i];
580 if (data >= buf->data && data < buf->data + buf->size)
586 AVFrameSideData *av_frame_new_side_data_from_buf(AVFrame *frame,
587 enum AVFrameSideDataType type,
590 AVFrameSideData *ret, **tmp;
595 if (frame->nb_side_data > INT_MAX / sizeof(*frame->side_data) - 1)
598 tmp = av_realloc(frame->side_data,
599 (frame->nb_side_data + 1) * sizeof(*frame->side_data));
602 frame->side_data = tmp;
604 ret = av_mallocz(sizeof(*ret));
609 ret->data = ret->buf->data;
610 ret->size = buf->size;
613 frame->side_data[frame->nb_side_data++] = ret;
618 AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
619 enum AVFrameSideDataType type,
622 AVFrameSideData *ret;
623 AVBufferRef *buf = av_buffer_alloc(size);
624 ret = av_frame_new_side_data_from_buf(frame, type, buf);
626 av_buffer_unref(&buf);
630 AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
631 enum AVFrameSideDataType type)
635 for (i = 0; i < frame->nb_side_data; i++) {
636 if (frame->side_data[i]->type == type)
637 return frame->side_data[i];
642 static int frame_copy_video(AVFrame *dst, const AVFrame *src)
644 const uint8_t *src_data[4];
647 if (dst->width < src->width ||
648 dst->height < src->height)
649 return AVERROR(EINVAL);
651 if (src->hw_frames_ctx || dst->hw_frames_ctx)
652 return av_hwframe_transfer_data(dst, src, 0);
654 planes = av_pix_fmt_count_planes(dst->format);
655 for (i = 0; i < planes; i++)
656 if (!dst->data[i] || !src->data[i])
657 return AVERROR(EINVAL);
659 memcpy(src_data, src->data, sizeof(src_data));
660 av_image_copy(dst->data, dst->linesize,
661 src_data, src->linesize,
662 dst->format, src->width, src->height);
667 static int frame_copy_audio(AVFrame *dst, const AVFrame *src)
669 int planar = av_sample_fmt_is_planar(dst->format);
670 int channels = dst->channels;
671 int planes = planar ? channels : 1;
674 if (dst->nb_samples != src->nb_samples ||
675 dst->channels != src->channels ||
676 dst->channel_layout != src->channel_layout)
677 return AVERROR(EINVAL);
679 CHECK_CHANNELS_CONSISTENCY(src);
681 for (i = 0; i < planes; i++)
682 if (!dst->extended_data[i] || !src->extended_data[i])
683 return AVERROR(EINVAL);
685 av_samples_copy(dst->extended_data, src->extended_data, 0, 0,
686 dst->nb_samples, channels, dst->format);
691 int av_frame_copy(AVFrame *dst, const AVFrame *src)
693 if (dst->format != src->format || dst->format < 0)
694 return AVERROR(EINVAL);
696 if (dst->width > 0 && dst->height > 0)
697 return frame_copy_video(dst, src);
698 else if (dst->nb_samples > 0 && dst->channels > 0)
699 return frame_copy_audio(dst, src);
701 return AVERROR(EINVAL);
704 void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type)
708 for (i = frame->nb_side_data - 1; i >= 0; i--) {
709 AVFrameSideData *sd = frame->side_data[i];
710 if (sd->type == type) {
711 free_side_data(&frame->side_data[i]);
712 frame->side_data[i] = frame->side_data[frame->nb_side_data - 1];
713 frame->nb_side_data--;
718 const char *av_frame_side_data_name(enum AVFrameSideDataType type)
721 case AV_FRAME_DATA_PANSCAN: return "AVPanScan";
722 case AV_FRAME_DATA_A53_CC: return "ATSC A53 Part 4 Closed Captions";
723 case AV_FRAME_DATA_STEREO3D: return "Stereo 3D";
724 case AV_FRAME_DATA_MATRIXENCODING: return "AVMatrixEncoding";
725 case AV_FRAME_DATA_DOWNMIX_INFO: return "Metadata relevant to a downmix procedure";
726 case AV_FRAME_DATA_REPLAYGAIN: return "AVReplayGain";
727 case AV_FRAME_DATA_DISPLAYMATRIX: return "3x3 displaymatrix";
728 case AV_FRAME_DATA_AFD: return "Active format description";
729 case AV_FRAME_DATA_MOTION_VECTORS: return "Motion vectors";
730 case AV_FRAME_DATA_SKIP_SAMPLES: return "Skip samples";
731 case AV_FRAME_DATA_AUDIO_SERVICE_TYPE: return "Audio service type";
732 case AV_FRAME_DATA_MASTERING_DISPLAY_METADATA: return "Mastering display metadata";
733 case AV_FRAME_DATA_CONTENT_LIGHT_LEVEL: return "Content light level metadata";
734 case AV_FRAME_DATA_GOP_TIMECODE: return "GOP timecode";
735 case AV_FRAME_DATA_S12M_TIMECODE: return "SMPTE 12-1 timecode";
736 case AV_FRAME_DATA_SPHERICAL: return "Spherical Mapping";
737 case AV_FRAME_DATA_ICC_PROFILE: return "ICC profile";
738 case AV_FRAME_DATA_DYNAMIC_HDR_PLUS: return "HDR Dynamic Metadata SMPTE2094-40 (HDR10+)";
739 case AV_FRAME_DATA_REGIONS_OF_INTEREST: return "Regions Of Interest";
740 case AV_FRAME_DATA_VIDEO_ENC_PARAMS: return "Video encoding parameters";
741 case AV_FRAME_DATA_SEI_UNREGISTERED: return "H.26[45] User Data Unregistered SEI message";
742 case AV_FRAME_DATA_FILM_GRAIN_PARAMS: return "Film grain parameters";
743 case AV_FRAME_DATA_DETECTION_BBOXES: return "Bounding boxes for object detection and classification";
748 static int calc_cropping_offsets(size_t offsets[4], const AVFrame *frame,
749 const AVPixFmtDescriptor *desc)
753 for (i = 0; frame->data[i]; i++) {
754 const AVComponentDescriptor *comp = NULL;
755 int shift_x = (i == 1 || i == 2) ? desc->log2_chroma_w : 0;
756 int shift_y = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
758 if (desc->flags & (AV_PIX_FMT_FLAG_PAL | FF_PSEUDOPAL) && i == 1) {
763 /* find any component descriptor for this plane */
764 for (j = 0; j < desc->nb_components; j++) {
765 if (desc->comp[j].plane == i) {
766 comp = &desc->comp[j];
773 offsets[i] = (frame->crop_top >> shift_y) * frame->linesize[i] +
774 (frame->crop_left >> shift_x) * comp->step;
780 int av_frame_apply_cropping(AVFrame *frame, int flags)
782 const AVPixFmtDescriptor *desc;
786 if (!(frame->width > 0 && frame->height > 0))
787 return AVERROR(EINVAL);
789 if (frame->crop_left >= INT_MAX - frame->crop_right ||
790 frame->crop_top >= INT_MAX - frame->crop_bottom ||
791 (frame->crop_left + frame->crop_right) >= frame->width ||
792 (frame->crop_top + frame->crop_bottom) >= frame->height)
793 return AVERROR(ERANGE);
795 desc = av_pix_fmt_desc_get(frame->format);
799 /* Apply just the right/bottom cropping for hwaccel formats. Bitstream
800 * formats cannot be easily handled here either (and corresponding decoders
801 * should not export any cropping anyway), so do the same for those as well.
803 if (desc->flags & (AV_PIX_FMT_FLAG_BITSTREAM | AV_PIX_FMT_FLAG_HWACCEL)) {
804 frame->width -= frame->crop_right;
805 frame->height -= frame->crop_bottom;
806 frame->crop_right = 0;
807 frame->crop_bottom = 0;
811 /* calculate the offsets for each plane */
812 calc_cropping_offsets(offsets, frame, desc);
814 /* adjust the offsets to avoid breaking alignment */
815 if (!(flags & AV_FRAME_CROP_UNALIGNED)) {
816 int log2_crop_align = frame->crop_left ? ff_ctz(frame->crop_left) : INT_MAX;
817 int min_log2_align = INT_MAX;
819 for (i = 0; frame->data[i]; i++) {
820 int log2_align = offsets[i] ? ff_ctz(offsets[i]) : INT_MAX;
821 min_log2_align = FFMIN(log2_align, min_log2_align);
824 /* we assume, and it should always be true, that the data alignment is
825 * related to the cropping alignment by a constant power-of-2 factor */
826 if (log2_crop_align < min_log2_align)
829 if (min_log2_align < 5) {
830 frame->crop_left &= ~((1 << (5 + log2_crop_align - min_log2_align)) - 1);
831 calc_cropping_offsets(offsets, frame, desc);
835 for (i = 0; frame->data[i]; i++)
836 frame->data[i] += offsets[i];
838 frame->width -= (frame->crop_left + frame->crop_right);
839 frame->height -= (frame->crop_top + frame->crop_bottom);
840 frame->crop_left = 0;
841 frame->crop_right = 0;
843 frame->crop_bottom = 0;