frame.c

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/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#include "channel_layout.h"
#include "avassert.h"
#include "buffer.h"
#include "common.h"
#include "cpu.h"
#include "dict.h"
#include "frame.h"
#include "imgutils.h"
#include "mem.h"
#include "samplefmt.h"
#include "hwcontext.h"
 
static const AVSideDataDescriptor sd_props[] = {
    [AV_FRAME_DATA_PANSCAN]                     = { "AVPanScan" },
    [AV_FRAME_DATA_A53_CC]                      = { "ATSC A53 Part 4 Closed Captions" },
    [AV_FRAME_DATA_MATRIXENCODING]              = { "AVMatrixEncoding" },
    [AV_FRAME_DATA_DOWNMIX_INFO]                = { "Metadata relevant to a downmix procedure" },
    [AV_FRAME_DATA_AFD]                         = { "Active format description" },
    [AV_FRAME_DATA_MOTION_VECTORS]              = { "Motion vectors" },
    [AV_FRAME_DATA_SKIP_SAMPLES]                = { "Skip samples" },
    [AV_FRAME_DATA_GOP_TIMECODE]                = { "GOP timecode" },
    [AV_FRAME_DATA_S12M_TIMECODE]               = { "SMPTE 12-1 timecode" },
    [AV_FRAME_DATA_DYNAMIC_HDR_PLUS]            = { "HDR Dynamic Metadata SMPTE2094-40 (HDR10+)" },
    [AV_FRAME_DATA_DYNAMIC_HDR_VIVID]           = { "HDR Dynamic Metadata CUVA 005.1 2021 (Vivid)" },
    [AV_FRAME_DATA_REGIONS_OF_INTEREST]         = { "Regions Of Interest" },
    [AV_FRAME_DATA_VIDEO_ENC_PARAMS]            = { "Video encoding parameters" },
    [AV_FRAME_DATA_FILM_GRAIN_PARAMS]           = { "Film grain parameters" },
    [AV_FRAME_DATA_DETECTION_BBOXES]            = { "Bounding boxes for object detection and classification" },
    [AV_FRAME_DATA_DOVI_RPU_BUFFER]             = { "Dolby Vision RPU Data" },
    [AV_FRAME_DATA_DOVI_METADATA]               = { "Dolby Vision Metadata" },
    [AV_FRAME_DATA_LCEVC]                       = { "LCEVC NAL data" },
    [AV_FRAME_DATA_VIEW_ID]                     = { "View ID" },
    [AV_FRAME_DATA_STEREO3D]                    = { "Stereo 3D",                                    AV_SIDE_DATA_PROP_GLOBAL },
    [AV_FRAME_DATA_REPLAYGAIN]                  = { "AVReplayGain",                                 AV_SIDE_DATA_PROP_GLOBAL },
    [AV_FRAME_DATA_DISPLAYMATRIX]               = { "3x3 displaymatrix",                            AV_SIDE_DATA_PROP_GLOBAL },
    [AV_FRAME_DATA_AUDIO_SERVICE_TYPE]          = { "Audio service type",                           AV_SIDE_DATA_PROP_GLOBAL },
    [AV_FRAME_DATA_MASTERING_DISPLAY_METADATA]  = { "Mastering display metadata",                   AV_SIDE_DATA_PROP_GLOBAL },
    [AV_FRAME_DATA_CONTENT_LIGHT_LEVEL]         = { "Content light level metadata",                 AV_SIDE_DATA_PROP_GLOBAL },
    [AV_FRAME_DATA_AMBIENT_VIEWING_ENVIRONMENT] = { "Ambient viewing environment",                  AV_SIDE_DATA_PROP_GLOBAL },
    [AV_FRAME_DATA_SPHERICAL]                   = { "Spherical Mapping",                            AV_SIDE_DATA_PROP_GLOBAL },
    [AV_FRAME_DATA_ICC_PROFILE]                 = { "ICC profile",                                  AV_SIDE_DATA_PROP_GLOBAL },
    [AV_FRAME_DATA_SEI_UNREGISTERED]            = { "H.26[45] User Data Unregistered SEI message",  AV_SIDE_DATA_PROP_MULTI },
};
 
static void get_frame_defaults(AVFrame *frame)
{
    memset(frame, 0, sizeof(*frame));
 
    frame->pts                   =
    frame->pkt_dts               = AV_NOPTS_VALUE;
    frame->best_effort_timestamp = AV_NOPTS_VALUE;
    frame->duration            = 0;
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
    frame->pkt_pos             = -1;
    frame->pkt_size            = -1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
    frame->time_base           = (AVRational){ 0, 1 };
    frame->sample_aspect_ratio = (AVRational){ 0, 1 };
    frame->format              = -1; /* unknown */
    frame->extended_data       = frame->data;
    frame->color_primaries     = AVCOL_PRI_UNSPECIFIED;
    frame->color_trc           = AVCOL_TRC_UNSPECIFIED;
    frame->colorspace          = AVCOL_SPC_UNSPECIFIED;
    frame->color_range         = AVCOL_RANGE_UNSPECIFIED;
    frame->chroma_location     = AVCHROMA_LOC_UNSPECIFIED;
    frame->flags               = 0;
}
 
static void free_side_data(AVFrameSideData **ptr_sd)
{
    AVFrameSideData *sd = *ptr_sd;
 
    av_buffer_unref(&sd->buf);
    av_dict_free(&sd->metadata);
    av_freep(ptr_sd);
}
 
static void wipe_side_data(AVFrameSideData ***sd, int *nb_side_data)
{
    for (int i = 0; i < *nb_side_data; i++) {
        free_side_data(&((*sd)[i]));
    }
    *nb_side_data = 0;
 
    av_freep(sd);
}
 
static void frame_side_data_wipe(AVFrame *frame)
{
    wipe_side_data(&frame->side_data, &frame->nb_side_data);
}
 
void av_frame_side_data_free(AVFrameSideData ***sd, int *nb_sd)
{
    wipe_side_data(sd, nb_sd);
}
 
static void remove_side_data(AVFrameSideData ***sd, int *nb_side_data,
                             const enum AVFrameSideDataType type)
{
    for (int i = *nb_side_data - 1; i >= 0; i--) {
        AVFrameSideData *entry = ((*sd)[i]);
        if (entry->type != type)
            continue;
 
        free_side_data(&entry);
 
        ((*sd)[i]) = ((*sd)[*nb_side_data - 1]);
        (*nb_side_data)--;
    }
}
 
static void remove_side_data_by_entry(AVFrameSideData ***sd, int *nb_sd,
                                      const AVFrameSideData *target)
{
    for (int i = *nb_sd - 1; i >= 0; i--) {
        AVFrameSideData *entry = ((*sd)[i]);
        if (entry != target)
            continue;
 
        free_side_data(&entry);
 
        ((*sd)[i]) = ((*sd)[*nb_sd - 1]);
        (*nb_sd)--;
 
        return;
    }
}
 
AVFrame *av_frame_alloc(void)
{
    AVFrame *frame = av_malloc(sizeof(*frame));
 
    if (!frame)
        return NULL;
 
    get_frame_defaults(frame);
 
    return frame;
}
 
void av_frame_free(AVFrame **frame)
{
    if (!frame || !*frame)
        return;
 
    av_frame_unref(*frame);
    av_freep(frame);
}
 
#define ALIGN (HAVE_SIMD_ALIGN_64 ? 64 : 32)
 
static int get_video_buffer(AVFrame *frame, int align)
{
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
    int ret, padded_height;
    int plane_padding;
    ptrdiff_t linesizes[4];
    size_t total_size, sizes[4];
 
    if (!desc)
        return AVERROR(EINVAL);
 
    if ((ret = av_image_check_size(frame->width, frame->height, 0, NULL)) < 0)
        return ret;
 
    if (align <= 0)
        align = ALIGN;
    plane_padding = FFMAX(ALIGN, align);
 
    if (!frame->linesize[0]) {
        for (int i = 1; i <= align; i += i) {
            ret = av_image_fill_linesizes(frame->linesize, frame->format,
                                          FFALIGN(frame->width, i));
            if (ret < 0)
                return ret;
            if (!(frame->linesize[0] & (align-1)))
                break;
        }
 
        for (int i = 0; i < 4 && frame->linesize[i]; i++)
            frame->linesize[i] = FFALIGN(frame->linesize[i], align);
    }
 
    for (int i = 0; i < 4; i++)
        linesizes[i] = frame->linesize[i];
 
    padded_height = FFALIGN(frame->height, 32);
    if ((ret = av_image_fill_plane_sizes(sizes, frame->format,
                                         padded_height, linesizes)) < 0)
        return ret;
 
    total_size = 4 * plane_padding + 4 * align;
    for (int i = 0; i < 4; i++) {
        if (sizes[i] > SIZE_MAX - total_size)
            return AVERROR(EINVAL);
        total_size += sizes[i];
    }
 
    frame->buf[0] = av_buffer_alloc(total_size);
    if (!frame->buf[0]) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }
 
    if ((ret = av_image_fill_pointers(frame->data, frame->format, padded_height,
                                      frame->buf[0]->data, frame->linesize)) < 0)
        goto fail;
 
    for (int i = 1; i < 4; i++) {
        if (frame->data[i])
            frame->data[i] += i * plane_padding;
        frame->data[i] = (uint8_t *)FFALIGN((uintptr_t)frame->data[i], align);
    }
 
    frame->extended_data = frame->data;
 
    return 0;
fail:
    av_frame_unref(frame);
    return ret;
}
 
static int get_audio_buffer(AVFrame *frame, int align)
{
    int planar   = av_sample_fmt_is_planar(frame->format);
    int channels, planes;
    size_t size;
    int ret;
 
    channels = frame->ch_layout.nb_channels;
    planes   = planar ? channels : 1;
    if (!frame->linesize[0]) {
        ret = av_samples_get_buffer_size(&frame->linesize[0], channels,
                                         frame->nb_samples, frame->format,
                                         align);
        if (ret < 0)
            return ret;
    }
 
    if (align <= 0)
        align = ALIGN;
 
    if (planes > AV_NUM_DATA_POINTERS) {
        frame->extended_data = av_calloc(planes,
                                          sizeof(*frame->extended_data));
        frame->extended_buf  = av_calloc(planes - AV_NUM_DATA_POINTERS,
                                          sizeof(*frame->extended_buf));
        if (!frame->extended_data || !frame->extended_buf) {
            av_freep(&frame->extended_data);
            av_freep(&frame->extended_buf);
            return AVERROR(ENOMEM);
        }
        frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
    } else
        frame->extended_data = frame->data;
 
    if (frame->linesize[0] > SIZE_MAX - align)
        return AVERROR(EINVAL);
    size = frame->linesize[0] + (size_t)align;
 
    for (int i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
        frame->buf[i] = av_buffer_alloc(size);
        if (!frame->buf[i]) {
            av_frame_unref(frame);
            return AVERROR(ENOMEM);
        }
        frame->extended_data[i] = frame->data[i] =
            (uint8_t *)FFALIGN((uintptr_t)frame->buf[i]->data, align);
    }
    for (int i = 0; i < planes - AV_NUM_DATA_POINTERS; i++) {
        frame->extended_buf[i] = av_buffer_alloc(size);
        if (!frame->extended_buf[i]) {
            av_frame_unref(frame);
            return AVERROR(ENOMEM);
        }
        frame->extended_data[i + AV_NUM_DATA_POINTERS] =
            (uint8_t *)FFALIGN((uintptr_t)frame->extended_buf[i]->data, align);
    }
    return 0;
 
}
 
int av_frame_get_buffer(AVFrame *frame, int align)
{
    if (frame->format < 0)
        return AVERROR(EINVAL);
 
    if (frame->width > 0 && frame->height > 0)
        return get_video_buffer(frame, align);
    else if (frame->nb_samples > 0 &&
             (av_channel_layout_check(&frame->ch_layout)))
        return get_audio_buffer(frame, align);
 
    return AVERROR(EINVAL);
}
 
static int frame_copy_props(AVFrame *dst, const AVFrame *src, int force_copy)
{
    int ret;
 
#if FF_API_FRAME_KEY
FF_DISABLE_DEPRECATION_WARNINGS
    dst->key_frame              = src->key_frame;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
    dst->pict_type              = src->pict_type;
    dst->sample_aspect_ratio    = src->sample_aspect_ratio;
    dst->crop_top               = src->crop_top;
    dst->crop_bottom            = src->crop_bottom;
    dst->crop_left              = src->crop_left;
    dst->crop_right             = src->crop_right;
    dst->pts                    = src->pts;
    dst->duration               = src->duration;
    dst->repeat_pict            = src->repeat_pict;
#if FF_API_INTERLACED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
    dst->interlaced_frame       = src->interlaced_frame;
    dst->top_field_first        = src->top_field_first;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
#if FF_API_PALETTE_HAS_CHANGED
FF_DISABLE_DEPRECATION_WARNINGS
    dst->palette_has_changed    = src->palette_has_changed;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
    dst->sample_rate            = src->sample_rate;
    dst->opaque                 = src->opaque;
    dst->pkt_dts                = src->pkt_dts;
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
    dst->pkt_pos                = src->pkt_pos;
    dst->pkt_size               = src->pkt_size;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
    dst->time_base              = src->time_base;
    dst->quality                = src->quality;
    dst->best_effort_timestamp  = src->best_effort_timestamp;
    dst->flags                  = src->flags;
    dst->decode_error_flags     = src->decode_error_flags;
    dst->color_primaries        = src->color_primaries;
    dst->color_trc              = src->color_trc;
    dst->colorspace             = src->colorspace;
    dst->color_range            = src->color_range;
    dst->chroma_location        = src->chroma_location;
 
    av_dict_copy(&dst->metadata, src->metadata, 0);
 
    for (int i = 0; i < src->nb_side_data; i++) {
        const AVFrameSideData *sd_src = src->side_data[i];
        AVFrameSideData *sd_dst;
        if (   sd_src->type == AV_FRAME_DATA_PANSCAN
            && (src->width != dst->width || src->height != dst->height))
            continue;
        if (force_copy) {
            sd_dst = av_frame_new_side_data(dst, sd_src->type,
                                            sd_src->size);
            if (!sd_dst) {
                frame_side_data_wipe(dst);
                return AVERROR(ENOMEM);
            }
            memcpy(sd_dst->data, sd_src->data, sd_src->size);
        } else {
            AVBufferRef *ref = av_buffer_ref(sd_src->buf);
            sd_dst = av_frame_new_side_data_from_buf(dst, sd_src->type, ref);
            if (!sd_dst) {
                av_buffer_unref(&ref);
                frame_side_data_wipe(dst);
                return AVERROR(ENOMEM);
            }
        }
        av_dict_copy(&sd_dst->metadata, sd_src->metadata, 0);
    }
 
    ret = av_buffer_replace(&dst->opaque_ref, src->opaque_ref);
    ret |= av_buffer_replace(&dst->private_ref, src->private_ref);
    return ret;
}
 
int av_frame_ref(AVFrame *dst, const AVFrame *src)
{
    int ret = 0;
 
    av_assert1(dst->width == 0 && dst->height == 0);
    av_assert1(dst->ch_layout.nb_channels == 0 &&
               dst->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC);
 
    dst->format         = src->format;
    dst->width          = src->width;
    dst->height         = src->height;
    dst->nb_samples     = src->nb_samples;
 
    ret = frame_copy_props(dst, src, 0);
    if (ret < 0)
        goto fail;
 
    ret = av_channel_layout_copy(&dst->ch_layout, &src->ch_layout);
    if (ret < 0)
        goto fail;
 
    /* duplicate the frame data if it's not refcounted */
    if (!src->buf[0]) {
        ret = av_frame_get_buffer(dst, 0);
        if (ret < 0)
            goto fail;
 
        ret = av_frame_copy(dst, src);
        if (ret < 0)
            goto fail;
 
        return 0;
    }
 
    /* ref the buffers */
    for (int i = 0; i < FF_ARRAY_ELEMS(src->buf); i++) {
        if (!src->buf[i])
            continue;
        dst->buf[i] = av_buffer_ref(src->buf[i]);
        if (!dst->buf[i]) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
    }
 
    if (src->extended_buf) {
        dst->extended_buf = av_calloc(src->nb_extended_buf,
                                      sizeof(*dst->extended_buf));
        if (!dst->extended_buf) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        dst->nb_extended_buf = src->nb_extended_buf;
 
        for (int i = 0; i < src->nb_extended_buf; i++) {
            dst->extended_buf[i] = av_buffer_ref(src->extended_buf[i]);
            if (!dst->extended_buf[i]) {
                ret = AVERROR(ENOMEM);
                goto fail;
            }
        }
    }
 
    if (src->hw_frames_ctx) {
        dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
        if (!dst->hw_frames_ctx) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
    }
 
    /* duplicate extended data */
    if (src->extended_data != src->data) {
        int ch = dst->ch_layout.nb_channels;
 
        if (!ch) {
            ret = AVERROR(EINVAL);
            goto fail;
        }
 
        dst->extended_data = av_malloc_array(sizeof(*dst->extended_data), ch);
        if (!dst->extended_data) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        memcpy(dst->extended_data, src->extended_data, sizeof(*src->extended_data) * ch);
    } else
        dst->extended_data = dst->data;
 
    memcpy(dst->data,     src->data,     sizeof(src->data));
    memcpy(dst->linesize, src->linesize, sizeof(src->linesize));
 
    return 0;
 
fail:
    av_frame_unref(dst);
    return ret;
}
 
int av_frame_replace(AVFrame *dst, const AVFrame *src)
{
    int ret = 0;
 
    if (dst == src)
        return AVERROR(EINVAL);
 
    if (!src->buf[0]) {
        av_frame_unref(dst);
 
        /* duplicate the frame data if it's not refcounted */
        if (   src->data[0] || src->data[1]
            || src->data[2] || src->data[3])
            return av_frame_ref(dst, src);
 
        ret = frame_copy_props(dst, src, 0);
        if (ret < 0)
            goto fail;
    }
 
    dst->format         = src->format;
    dst->width          = src->width;
    dst->height         = src->height;
    dst->nb_samples     = src->nb_samples;
 
    ret = av_channel_layout_copy(&dst->ch_layout, &src->ch_layout);
    if (ret < 0)
        goto fail;
 
    frame_side_data_wipe(dst);
    av_dict_free(&dst->metadata);
    ret = frame_copy_props(dst, src, 0);
    if (ret < 0)
        goto fail;
 
    /* replace the buffers */
    for (int i = 0; i < FF_ARRAY_ELEMS(src->buf); i++) {
        ret = av_buffer_replace(&dst->buf[i], src->buf[i]);
        if (ret < 0)
            goto fail;
    }
 
    if (src->extended_buf) {
        if (dst->nb_extended_buf != src->nb_extended_buf) {
            int nb_extended_buf = FFMIN(dst->nb_extended_buf, src->nb_extended_buf);
            void *tmp;
 
            for (int i = nb_extended_buf; i < dst->nb_extended_buf; i++)
                av_buffer_unref(&dst->extended_buf[i]);
 
            tmp = av_realloc_array(dst->extended_buf, sizeof(*dst->extended_buf),
                                   src->nb_extended_buf);
            if (!tmp) {
                ret = AVERROR(ENOMEM);
                goto fail;
            }
            dst->extended_buf = tmp;
            dst->nb_extended_buf = src->nb_extended_buf;
 
            memset(&dst->extended_buf[nb_extended_buf], 0,
                   (src->nb_extended_buf - nb_extended_buf) * sizeof(*dst->extended_buf));
        }
 
        for (int i = 0; i < src->nb_extended_buf; i++) {
            ret = av_buffer_replace(&dst->extended_buf[i], src->extended_buf[i]);
            if (ret < 0)
                goto fail;
        }
    } else if (dst->extended_buf) {
        for (int i = 0; i < dst->nb_extended_buf; i++)
            av_buffer_unref(&dst->extended_buf[i]);
        av_freep(&dst->extended_buf);
    }
 
    ret = av_buffer_replace(&dst->hw_frames_ctx, src->hw_frames_ctx);
    if (ret < 0)
        goto fail;
 
    if (dst->extended_data != dst->data)
        av_freep(&dst->extended_data);
 
    if (src->extended_data != src->data) {
        int ch = dst->ch_layout.nb_channels;
 
        if (!ch) {
            ret = AVERROR(EINVAL);
            goto fail;
        }
 
        if (ch > SIZE_MAX / sizeof(*dst->extended_data))
            goto fail;
 
        dst->extended_data = av_memdup(src->extended_data, sizeof(*dst->extended_data) * ch);
        if (!dst->extended_data) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
    } else
        dst->extended_data = dst->data;
 
    memcpy(dst->data,     src->data,     sizeof(src->data));
    memcpy(dst->linesize, src->linesize, sizeof(src->linesize));
 
    return 0;
 
fail:
    av_frame_unref(dst);
    return ret;
}
 
AVFrame *av_frame_clone(const AVFrame *src)
{
    AVFrame *ret = av_frame_alloc();
 
    if (!ret)
        return NULL;
 
    if (av_frame_ref(ret, src) < 0)
        av_frame_free(&ret);
 
    return ret;
}
 
void av_frame_unref(AVFrame *frame)
{
    if (!frame)
        return;
 
    frame_side_data_wipe(frame);
 
    for (int i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
        av_buffer_unref(&frame->buf[i]);
    for (int i = 0; i < frame->nb_extended_buf; i++)
        av_buffer_unref(&frame->extended_buf[i]);
    av_freep(&frame->extended_buf);
    av_dict_free(&frame->metadata);
 
    av_buffer_unref(&frame->hw_frames_ctx);
 
    av_buffer_unref(&frame->opaque_ref);
    av_buffer_unref(&frame->private_ref);
 
    if (frame->extended_data != frame->data)
        av_freep(&frame->extended_data);
 
    av_channel_layout_uninit(&frame->ch_layout);
 
    get_frame_defaults(frame);
}
 
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
{
    av_assert1(dst->width == 0 && dst->height == 0);
    av_assert1(dst->ch_layout.nb_channels == 0 &&
               dst->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC);
 
    *dst = *src;
    if (src->extended_data == src->data)
        dst->extended_data = dst->data;
    get_frame_defaults(src);
}
 
int av_frame_is_writable(AVFrame *frame)
{
    int ret = 1;
 
    /* assume non-refcounted frames are not writable */
    if (!frame->buf[0])
        return 0;
 
    for (int i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
        if (frame->buf[i])
            ret &= !!av_buffer_is_writable(frame->buf[i]);
    for (int i = 0; i < frame->nb_extended_buf; i++)
        ret &= !!av_buffer_is_writable(frame->extended_buf[i]);
 
    return ret;
}
 
int av_frame_make_writable(AVFrame *frame)
{
    AVFrame tmp;
    int ret;
 
    if (av_frame_is_writable(frame))
        return 0;
 
    memset(&tmp, 0, sizeof(tmp));
    tmp.format         = frame->format;
    tmp.width          = frame->width;
    tmp.height         = frame->height;
    tmp.nb_samples     = frame->nb_samples;
    ret = av_channel_layout_copy(&tmp.ch_layout, &frame->ch_layout);
    if (ret < 0) {
        av_frame_unref(&tmp);
        return ret;
    }
 
    if (frame->hw_frames_ctx)
        ret = av_hwframe_get_buffer(frame->hw_frames_ctx, &tmp, 0);
    else
        ret = av_frame_get_buffer(&tmp, 0);
    if (ret < 0)
        return ret;
 
    ret = av_frame_copy(&tmp, frame);
    if (ret < 0) {
        av_frame_unref(&tmp);
        return ret;
    }
 
    ret = av_frame_copy_props(&tmp, frame);
    if (ret < 0) {
        av_frame_unref(&tmp);
        return ret;
    }
 
    av_frame_unref(frame);
 
    *frame = tmp;
    if (tmp.data == tmp.extended_data)
        frame->extended_data = frame->data;
 
    return 0;
}
 
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
{
    return frame_copy_props(dst, src, 1);
}
 
AVBufferRef *av_frame_get_plane_buffer(const AVFrame *frame, int plane)
{
    uint8_t *data;
    int planes;
 
    if (frame->nb_samples) {
        int channels = frame->ch_layout.nb_channels;
        if (!channels)
            return NULL;
        planes = av_sample_fmt_is_planar(frame->format) ? channels : 1;
    } else
        planes = 4;
 
    if (plane < 0 || plane >= planes || !frame->extended_data[plane])
        return NULL;
    data = frame->extended_data[plane];
 
    for (int i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++) {
        AVBufferRef *buf = frame->buf[i];
        if (data >= buf->data && data < buf->data + buf->size)
            return buf;
    }
    for (int i = 0; i < frame->nb_extended_buf; i++) {
        AVBufferRef *buf = frame->extended_buf[i];
        if (data >= buf->data && data < buf->data + buf->size)
            return buf;
    }
    return NULL;
}
 
static AVFrameSideData *add_side_data_from_buf_ext(AVFrameSideData ***sd,
                                                   int *nb_sd,
                                                   enum AVFrameSideDataType type,
                                                   AVBufferRef *buf, uint8_t *data,
                                                   size_t size)
{
    AVFrameSideData *ret, **tmp;
 
    // *nb_sd + 1 needs to fit into an int and a size_t.
    if ((unsigned)*nb_sd >= FFMIN(INT_MAX, SIZE_MAX))
        return NULL;
 
    tmp = av_realloc_array(*sd, sizeof(**sd), *nb_sd + 1);
    if (!tmp)
        return NULL;
    *sd = tmp;
 
    ret = av_mallocz(sizeof(*ret));
    if (!ret)
        return NULL;
 
    ret->buf = buf;
    ret->data = data;
    ret->size = size;
    ret->type = type;
 
    (*sd)[(*nb_sd)++] = ret;
 
    return ret;
}
 
static AVFrameSideData *add_side_data_from_buf(AVFrameSideData ***sd,
                                               int *nb_sd,
                                               enum AVFrameSideDataType type,
                                               AVBufferRef *buf)
{
    if (!buf)
        return NULL;
 
    return add_side_data_from_buf_ext(sd, nb_sd, type, buf, buf->data, buf->size);
}
 
AVFrameSideData *av_frame_new_side_data_from_buf(AVFrame *frame,
                                                 enum AVFrameSideDataType type,
                                                 AVBufferRef *buf)
{
    return
        add_side_data_from_buf(
            &frame->side_data, &frame->nb_side_data, type, buf);
}
 
AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
                                        enum AVFrameSideDataType type,
                                        size_t size)
{
    AVFrameSideData *ret;
    AVBufferRef *buf = av_buffer_alloc(size);
    ret = av_frame_new_side_data_from_buf(frame, type, buf);
    if (!ret)
        av_buffer_unref(&buf);
    return ret;
}
 
static AVFrameSideData *replace_side_data_from_buf(AVFrameSideData *dst,
                                                   AVBufferRef *buf, int flags)
{
    if (!(flags & AV_FRAME_SIDE_DATA_FLAG_REPLACE))
        return NULL;
 
    av_dict_free(&dst->metadata);
    av_buffer_unref(&dst->buf);
    dst->buf  = buf;
    dst->data = buf->data;
    dst->size = buf->size;
    return dst;
}
 
AVFrameSideData *av_frame_side_data_new(AVFrameSideData ***sd, int *nb_sd,
                                        enum AVFrameSideDataType type,
                                        size_t size, unsigned int flags)
{
    const AVSideDataDescriptor *desc = av_frame_side_data_desc(type);
    AVBufferRef     *buf = av_buffer_alloc(size);
    AVFrameSideData *ret = NULL;
 
    if (flags & AV_FRAME_SIDE_DATA_FLAG_UNIQUE)
        remove_side_data(sd, nb_sd, type);
    if ((!desc || !(desc->props & AV_SIDE_DATA_PROP_MULTI)) &&
        (ret = (AVFrameSideData *)av_frame_side_data_get(*sd, *nb_sd, type))) {
        ret = replace_side_data_from_buf(ret, buf, flags);
        if (!ret)
            av_buffer_unref(&buf);
        return ret;
    }
 
    ret = add_side_data_from_buf(sd, nb_sd, type, buf);
    if (!ret)
        av_buffer_unref(&buf);
 
    return ret;
}
 
AVFrameSideData *av_frame_side_data_add(AVFrameSideData ***sd, int *nb_sd,
                                        enum AVFrameSideDataType type,
                                        AVBufferRef **pbuf, unsigned int flags)
{
    const AVSideDataDescriptor *desc = av_frame_side_data_desc(type);
    AVFrameSideData *sd_dst  = NULL;
    AVBufferRef *buf = *pbuf;
 
    if (flags & AV_FRAME_SIDE_DATA_FLAG_UNIQUE)
        remove_side_data(sd, nb_sd, type);
    if ((!desc || !(desc->props & AV_SIDE_DATA_PROP_MULTI)) &&
        (sd_dst = (AVFrameSideData *)av_frame_side_data_get(*sd, *nb_sd, type))) {
        sd_dst = replace_side_data_from_buf(sd_dst, buf, flags);
        if (sd_dst)
            *pbuf = NULL;
        return sd_dst;
    }
 
    sd_dst = add_side_data_from_buf(sd, nb_sd, type, buf);
    if (!sd_dst)
        return NULL;
 
    *pbuf = NULL;
    return sd_dst;
}
 
int av_frame_side_data_clone(AVFrameSideData ***sd, int *nb_sd,
                             const AVFrameSideData *src, unsigned int flags)
{
    const AVSideDataDescriptor *desc;
    AVBufferRef     *buf    = NULL;
    AVFrameSideData *sd_dst = NULL;
    int              ret    = AVERROR_BUG;
 
    if (!sd || !src || !nb_sd || (*nb_sd && !*sd))
        return AVERROR(EINVAL);
 
    desc = av_frame_side_data_desc(src->type);
    if (flags & AV_FRAME_SIDE_DATA_FLAG_UNIQUE)
        remove_side_data(sd, nb_sd, src->type);
    if ((!desc || !(desc->props & AV_SIDE_DATA_PROP_MULTI)) &&
        (sd_dst = (AVFrameSideData *)av_frame_side_data_get(*sd, *nb_sd, src->type))) {
        AVDictionary *dict = NULL;
 
        if (!(flags & AV_FRAME_SIDE_DATA_FLAG_REPLACE))
            return AVERROR(EEXIST);
 
        ret = av_dict_copy(&dict, src->metadata, 0);
        if (ret < 0)
            return ret;
 
        ret = av_buffer_replace(&sd_dst->buf, src->buf);
        if (ret < 0) {
            av_dict_free(&dict);
            return ret;
        }
 
        av_dict_free(&sd_dst->metadata);
        sd_dst->metadata = dict;
        sd_dst->data     = src->data;
        sd_dst->size     = src->size;
        return 0;
    }
 
    buf = av_buffer_ref(src->buf);
    if (!buf)
        return AVERROR(ENOMEM);
 
    sd_dst = add_side_data_from_buf_ext(sd, nb_sd, src->type, buf,
                                        src->data, src->size);
    if (!sd_dst) {
        av_buffer_unref(&buf);
        return AVERROR(ENOMEM);
    }
 
    ret = av_dict_copy(&sd_dst->metadata, src->metadata, 0);
    if (ret < 0) {
        remove_side_data_by_entry(sd, nb_sd, sd_dst);
        return ret;
    }
 
    return 0;
}
 
const AVFrameSideData *av_frame_side_data_get_c(const AVFrameSideData * const *sd,
                                                const int nb_sd,
                                                enum AVFrameSideDataType type)
{
    for (int i = 0; i < nb_sd; i++) {
        if (sd[i]->type == type)
            return sd[i];
    }
    return NULL;
}
 
void av_frame_side_data_remove(AVFrameSideData ***sd, int *nb_sd,
                               enum AVFrameSideDataType type)
{
    remove_side_data(sd, nb_sd, type);
}
 
AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
                                        enum AVFrameSideDataType type)
{
    return (AVFrameSideData *)av_frame_side_data_get(
        frame->side_data, frame->nb_side_data,
        type
    );
}
 
static int frame_copy_video(AVFrame *dst, const AVFrame *src)
{
    int planes;
 
    if (dst->width  < src->width ||
        dst->height < src->height)
        return AVERROR(EINVAL);
 
    if (src->hw_frames_ctx || dst->hw_frames_ctx)
        return av_hwframe_transfer_data(dst, src, 0);
 
    planes = av_pix_fmt_count_planes(dst->format);
    for (int i = 0; i < planes; i++)
        if (!dst->data[i] || !src->data[i])
            return AVERROR(EINVAL);
 
    av_image_copy2(dst->data, dst->linesize,
                   src->data, src->linesize,
                   dst->format, src->width, src->height);
 
    return 0;
}
 
static int frame_copy_audio(AVFrame *dst, const AVFrame *src)
{
    int planar   = av_sample_fmt_is_planar(dst->format);
    int channels = dst->ch_layout.nb_channels;
    int planes   = planar ? channels : 1;
 
    if (dst->nb_samples != src->nb_samples ||
        av_channel_layout_compare(&dst->ch_layout, &src->ch_layout))
        return AVERROR(EINVAL);
 
    for (int i = 0; i < planes; i++)
        if (!dst->extended_data[i] || !src->extended_data[i])
            return AVERROR(EINVAL);
 
    av_samples_copy(dst->extended_data, src->extended_data, 0, 0,
                    dst->nb_samples, channels, dst->format);
 
    return 0;
}
 
int av_frame_copy(AVFrame *dst, const AVFrame *src)
{
    if (dst->format != src->format || dst->format < 0)
        return AVERROR(EINVAL);
 
    if (dst->width > 0 && dst->height > 0)
        return frame_copy_video(dst, src);
    else if (dst->nb_samples > 0 &&
             (av_channel_layout_check(&dst->ch_layout)))
        return frame_copy_audio(dst, src);
 
    return AVERROR(EINVAL);
}
 
void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type)
{
    remove_side_data(&frame->side_data, &frame->nb_side_data, type);
}
 
const AVSideDataDescriptor *av_frame_side_data_desc(enum AVFrameSideDataType type)
{
    unsigned t = type;
    if (t < FF_ARRAY_ELEMS(sd_props) && sd_props[t].name)
        return &sd_props[t];
    return NULL;
}
 
const char *av_frame_side_data_name(enum AVFrameSideDataType type)
{
    const AVSideDataDescriptor *desc = av_frame_side_data_desc(type);
    return desc ? desc->name : NULL;
}
 
static int calc_cropping_offsets(size_t offsets[4], const AVFrame *frame,
                                 const AVPixFmtDescriptor *desc)
{
    for (int i = 0; frame->data[i]; i++) {
        const AVComponentDescriptor *comp = NULL;
        int shift_x = (i == 1 || i == 2) ? desc->log2_chroma_w : 0;
        int shift_y = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
 
        if (desc->flags & AV_PIX_FMT_FLAG_PAL && i == 1) {
            offsets[i] = 0;
            break;
        }
 
        /* find any component descriptor for this plane */
        for (int j = 0; j < desc->nb_components; j++) {
            if (desc->comp[j].plane == i) {
                comp = &desc->comp[j];
                break;
            }
        }
        if (!comp)
            return AVERROR_BUG;
 
        offsets[i] = (frame->crop_top  >> shift_y) * frame->linesize[i] +
                     (frame->crop_left >> shift_x) * comp->step;
    }
 
    return 0;
}
 
int av_frame_apply_cropping(AVFrame *frame, int flags)
{
    const AVPixFmtDescriptor *desc;
    size_t offsets[4];
 
    if (!(frame->width > 0 && frame->height > 0))
        return AVERROR(EINVAL);
 
    if (frame->crop_left >= INT_MAX - frame->crop_right        ||
        frame->crop_top  >= INT_MAX - frame->crop_bottom       ||
        (frame->crop_left + frame->crop_right) >= frame->width ||
        (frame->crop_top + frame->crop_bottom) >= frame->height)
        return AVERROR(ERANGE);
 
    desc = av_pix_fmt_desc_get(frame->format);
    if (!desc)
        return AVERROR_BUG;
 
    /* Apply just the right/bottom cropping for hwaccel formats. Bitstream
     * formats cannot be easily handled here either (and corresponding decoders
     * should not export any cropping anyway), so do the same for those as well.
     * */
    if (desc->flags & (AV_PIX_FMT_FLAG_BITSTREAM | AV_PIX_FMT_FLAG_HWACCEL)) {
        frame->width      -= frame->crop_right;
        frame->height     -= frame->crop_bottom;
        frame->crop_right  = 0;
        frame->crop_bottom = 0;
        return 0;
    }
 
    /* calculate the offsets for each plane */
    calc_cropping_offsets(offsets, frame, desc);
 
    /* adjust the offsets to avoid breaking alignment */
    if (!(flags & AV_FRAME_CROP_UNALIGNED)) {
        int log2_crop_align = frame->crop_left ? ff_ctz(frame->crop_left) : INT_MAX;
        int min_log2_align = INT_MAX;
 
        for (int i = 0; frame->data[i]; i++) {
            int log2_align = offsets[i] ? ff_ctz(offsets[i]) : INT_MAX;
            min_log2_align = FFMIN(log2_align, min_log2_align);
        }
 
        /* we assume, and it should always be true, that the data alignment is
         * related to the cropping alignment by a constant power-of-2 factor */
        if (log2_crop_align < min_log2_align)
            return AVERROR_BUG;
 
        if (min_log2_align < 5 && log2_crop_align != INT_MAX) {
            frame->crop_left &= ~((1 << (5 + log2_crop_align - min_log2_align)) - 1);
            calc_cropping_offsets(offsets, frame, desc);
        }
    }
 
    for (int i = 0; frame->data[i]; i++)
        frame->data[i] += offsets[i];
 
    frame->width      -= (frame->crop_left + frame->crop_right);
    frame->height     -= (frame->crop_top  + frame->crop_bottom);
    frame->crop_left   = 0;
    frame->crop_right  = 0;
    frame->crop_top    = 0;
    frame->crop_bottom = 0;
 
    return 0;
}