FFmpeg/libavutil/frame.c

/*
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "channel_layout.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"

static void get_frame_defaults(AVFrame *frame)
{
    if (frame->extended_data != frame->data)
        av_freep(&frame->extended_data);

    memset(frame, 0, sizeof(*frame));

    frame->pts                 = AV_NOPTS_VALUE;
    frame->key_frame           = 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;
}

static void free_side_data(AVFrameSideData **ptr_sd)
{
    AVFrameSideData *sd = *ptr_sd;

    av_freep(&sd->data);
    av_dict_free(&sd->metadata);
    av_freep(ptr_sd);
}

static void wipe_side_data(AVFrame *frame)
{
    int i;

    for (i = 0; i < frame->nb_side_data; i++) {
        free_side_data(&frame->side_data[i]);
    }
    frame->nb_side_data = 0;

    av_freep(&frame->side_data);
}

AVFrame *av_frame_alloc(void)
{
    AVFrame *frame = av_mallocz(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);
}

static int get_video_buffer(AVFrame *frame, int align)
{
    int ret, i;

    if ((ret = av_image_check_size(frame->width, frame->height, 0, NULL)) < 0)
        return ret;

    if (!frame->linesize[0]) {
        ret = av_image_fill_linesizes(frame->linesize, frame->format,
                                      frame->width);
        if (ret < 0)
            return ret;

        if (align <= 0)
            align = av_cpu_max_align();

        for (i = 0; i < 4 && frame->linesize[i]; i++)
            frame->linesize[i] = FFALIGN(frame->linesize[i], align);
    }

    if ((ret = av_image_fill_pointers(frame->data, frame->format, frame->height,
                                      NULL, frame->linesize)) < 0)
        return ret;

    frame->buf[0] = av_buffer_alloc(ret);
    if (!frame->buf[0])
        goto fail;

    if (av_image_fill_pointers(frame->data, frame->format, frame->height,
                               frame->buf[0]->data, frame->linesize) < 0)
        goto fail;

    frame->extended_data = frame->data;

    return 0;
fail:
    av_frame_unref(frame);
    return AVERROR(ENOMEM);
}

static int get_audio_buffer(AVFrame *frame, int align)
{
    int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
    int planar   = av_sample_fmt_is_planar(frame->format);
    int planes   = planar ? channels : 1;
    int ret, i;

    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 (planes > AV_NUM_DATA_POINTERS) {
        frame->extended_data = av_mallocz(planes *
                                          sizeof(*frame->extended_data));
        frame->extended_buf  = av_mallocz((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;

    for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
        frame->buf[i] = av_buffer_alloc(frame->linesize[0]);
        if (!frame->buf[i]) {
            av_frame_unref(frame);
            return AVERROR(ENOMEM);
        }
        frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
    }
    for (i = 0; i < planes - AV_NUM_DATA_POINTERS; i++) {
        frame->extended_buf[i] = av_buffer_alloc(frame->linesize[0]);
        if (!frame->extended_buf[i]) {
            av_frame_unref(frame);
            return AVERROR(ENOMEM);
        }
        frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
    }
    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 && frame->channel_layout)
        return get_audio_buffer(frame, align);

    return AVERROR(EINVAL);
}

int av_frame_ref(AVFrame *dst, const AVFrame *src)
{
    int i, ret = 0;

    dst->format         = src->format;
    dst->width          = src->width;
    dst->height         = src->height;
    dst->channel_layout = src->channel_layout;
    dst->nb_samples     = src->nb_samples;

    ret = av_frame_copy_props(dst, src);
    if (ret < 0)
        return ret;

    /* duplicate the frame data if it's not refcounted */
    if (!src->buf[0]) {
        ret = av_frame_get_buffer(dst, 32);
        if (ret < 0)
            return ret;

        ret = av_frame_copy(dst, src);
        if (ret < 0)
            av_frame_unref(dst);

        return ret;
    }

    /* ref the buffers */
    for (i = 0; i < FF_ARRAY_ELEMS(src->buf) && src->buf[i]; i++) {
        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_mallocz(sizeof(*dst->extended_buf) *
                                       src->nb_extended_buf);
        if (!dst->extended_buf) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        dst->nb_extended_buf = src->nb_extended_buf;

        for (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 = av_get_channel_layout_nb_channels(src->channel_layout);

        if (!ch) {
            ret = AVERROR(EINVAL);
            goto fail;
        }

        dst->extended_data = av_malloc(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;
}

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)
{
    int i;

    wipe_side_data(frame);

    for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
        av_buffer_unref(&frame->buf[i]);
    for (i = 0; i < frame->nb_extended_buf; i++)
        av_buffer_unref(&frame->extended_buf[i]);
    av_freep(&frame->extended_buf);

    av_buffer_unref(&frame->hw_frames_ctx);

    av_buffer_unref(&frame->opaque_ref);

    get_frame_defaults(frame);
}

void av_frame_move_ref(AVFrame *dst, AVFrame *src)
{
    *dst = *src;
    if (src->extended_data == src->data)
        dst->extended_data = dst->data;
    memset(src, 0, sizeof(*src));
    get_frame_defaults(src);
}

int av_frame_is_writable(AVFrame *frame)
{
    int i, ret = 1;

    /* assume non-refcounted frames are not writable */
    if (!frame->buf[0])
        return 0;

    for (i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++)
        ret &= !!av_buffer_is_writable(frame->buf[i]);
    for (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 (!frame->buf[0])
        return AVERROR(EINVAL);

    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.channel_layout = frame->channel_layout;
    tmp.nb_samples     = frame->nb_samples;
    ret = av_frame_get_buffer(&tmp, 32);
    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)
{
    int i;

    dst->key_frame              = src->key_frame;
    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->repeat_pict            = src->repeat_pict;
    dst->interlaced_frame       = src->interlaced_frame;
    dst->top_field_first        = src->top_field_first;
    dst->palette_has_changed    = src->palette_has_changed;
    dst->sample_rate            = src->sample_rate;
    dst->opaque                 = src->opaque;
#if FF_API_PKT_PTS
FF_DISABLE_DEPRECATION_WARNINGS
    dst->pkt_pts                = src->pkt_pts;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
    dst->pkt_dts                = src->pkt_dts;
    dst->reordered_opaque       = src->reordered_opaque;
    dst->quality                = src->quality;
    dst->coded_picture_number   = src->coded_picture_number;
    dst->display_picture_number = src->display_picture_number;
    dst->flags                  = src->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;

#if FF_API_ERROR_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
    memcpy(dst->error, src->error, sizeof(dst->error));
FF_ENABLE_DEPRECATION_WARNINGS
#endif

    for (i = 0; i < src->nb_side_data; i++) {
        const AVFrameSideData *sd_src = src->side_data[i];
        AVFrameSideData *sd_dst = av_frame_new_side_data(dst, sd_src->type,
                                                         sd_src->size);
        if (!sd_dst) {
            wipe_side_data(dst);
            return AVERROR(ENOMEM);
        }
        memcpy(sd_dst->data, sd_src->data, sd_src->size);
        av_dict_copy(&sd_dst->metadata, sd_src->metadata, 0);
    }

    av_buffer_unref(&dst->opaque_ref);
    if (src->opaque_ref) {
        dst->opaque_ref = av_buffer_ref(src->opaque_ref);
        if (!dst->opaque_ref)
            return AVERROR(ENOMEM);
    }

    return 0;
}

AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane)
{
    uint8_t *data;
    int planes, i;

    if (frame->nb_samples) {
        int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
        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 (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 (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;
}

AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
                                        enum AVFrameSideDataType type,
                                        int size)
{
    AVFrameSideData *ret, **tmp;

    if (frame->nb_side_data > INT_MAX / sizeof(*frame->side_data) - 1)
        return NULL;

    tmp = av_realloc(frame->side_data,
                     (frame->nb_side_data + 1) * sizeof(*frame->side_data));
    if (!tmp)
        return NULL;
    frame->side_data = tmp;

    ret = av_mallocz(sizeof(*ret));
    if (!ret)
        return NULL;

    ret->data = av_malloc(size);
    if (!ret->data) {
        av_freep(&ret);
        return NULL;
    }

    ret->size = size;
    ret->type = type;

    frame->side_data[frame->nb_side_data++] = ret;

    return ret;
}

AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
                                        enum AVFrameSideDataType type)
{
    int i;

    for (i = 0; i < frame->nb_side_data; i++) {
        if (frame->side_data[i]->type == type)
            return frame->side_data[i];
    }
    return NULL;
}

static int frame_copy_video(AVFrame *dst, const AVFrame *src)
{
    const uint8_t *src_data[4];
    int i, planes;

    if (dst->width  != src->width ||
        dst->height != src->height)
        return AVERROR(EINVAL);

    planes = av_pix_fmt_count_planes(dst->format);
    for (i = 0; i < planes; i++)
        if (!dst->data[i] || !src->data[i])
            return AVERROR(EINVAL);

    memcpy(src_data, src->data, sizeof(src_data));
    av_image_copy(dst->data, dst->linesize,
                  src_data, src->linesize,
                  dst->format, dst->width, dst->height);

    return 0;
}

static int frame_copy_audio(AVFrame *dst, const AVFrame *src)
{
    int planar   = av_sample_fmt_is_planar(dst->format);
    int channels = av_get_channel_layout_nb_channels(dst->channel_layout);
    int planes   = planar ? channels : 1;
    int i;

    if (dst->nb_samples     != src->nb_samples ||
        dst->channel_layout != src->channel_layout)
        return AVERROR(EINVAL);

    for (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 && dst->channel_layout)
        return frame_copy_audio(dst, src);

    return AVERROR(EINVAL);
}

void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type)
{
    int i;

    for (i = 0; i < frame->nb_side_data; i++) {
        AVFrameSideData *sd = frame->side_data[i];
        if (sd->type == type) {
            free_side_data(&frame->side_data[i]);
            frame->side_data[i] = frame->side_data[frame->nb_side_data - 1];
            frame->nb_side_data--;
        }
    }
}

static int calc_cropping_offsets(size_t offsets[4], const AVFrame *frame,
                                 const AVPixFmtDescriptor *desc)
{
    int i, j;

    for (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 | AV_PIX_FMT_FLAG_PSEUDOPAL) && i == 1) {
            offsets[i] = 0;
            break;
        }

        /* find any component descriptor for this plane */
        for (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];
    int i;

    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 ? av_ctz(frame->crop_left) : INT_MAX;
        int min_log2_align = INT_MAX;

        for (i = 0; frame->data[i]; i++) {
            int log2_align = offsets[i] ? av_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) {
            frame->crop_left &= ~((1 << (5 + log2_crop_align - min_log2_align)) - 1);
            calc_cropping_offsets(offsets, frame, desc);
        }
    }

    for (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;
}