frame.c 21.9 KB
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/*
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * 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.
 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * 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
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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#include "channel_layout.h"
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#include "avassert.h"
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#include "buffer.h"
#include "common.h"
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#include "dict.h"
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#include "frame.h"
#include "imgutils.h"
#include "mem.h"
#include "samplefmt.h"

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MAKE_ACCESSORS(AVFrame, frame, int64_t, best_effort_timestamp)
MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_duration)
MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_pos)
MAKE_ACCESSORS(AVFrame, frame, int64_t, channel_layout)
MAKE_ACCESSORS(AVFrame, frame, int,     channels)
MAKE_ACCESSORS(AVFrame, frame, int,     sample_rate)
MAKE_ACCESSORS(AVFrame, frame, AVDictionary *, metadata)
MAKE_ACCESSORS(AVFrame, frame, int,     decode_error_flags)
MAKE_ACCESSORS(AVFrame, frame, int,     pkt_size)
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MAKE_ACCESSORS(AVFrame, frame, enum AVColorSpace, colorspace)
MAKE_ACCESSORS(AVFrame, frame, enum AVColorRange, color_range)
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#define CHECK_CHANNELS_CONSISTENCY(frame) \
    av_assert2(!(frame)->channel_layout || \
               (frame)->channels == \
               av_get_channel_layout_nb_channels((frame)->channel_layout))

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AVDictionary **avpriv_frame_get_metadatap(AVFrame *frame) {return &frame->metadata;};

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#if FF_API_FRAME_QP
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int av_frame_set_qp_table(AVFrame *f, AVBufferRef *buf, int stride, int qp_type)
{
    av_buffer_unref(&f->qp_table_buf);

    f->qp_table_buf = buf;

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FF_DISABLE_DEPRECATION_WARNINGS
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    f->qscale_table = buf->data;
    f->qstride      = stride;
    f->qscale_type  = qp_type;
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FF_ENABLE_DEPRECATION_WARNINGS
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    return 0;
}

int8_t *av_frame_get_qp_table(AVFrame *f, int *stride, int *type)
{
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FF_DISABLE_DEPRECATION_WARNINGS
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    *stride = f->qstride;
    *type   = f->qscale_type;
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FF_ENABLE_DEPRECATION_WARNINGS
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    if (!f->qp_table_buf)
        return NULL;

    return f->qp_table_buf->data;
}
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#endif
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const char *av_get_colorspace_name(enum AVColorSpace val)
{
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    static const char * const name[] = {
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        [AVCOL_SPC_RGB]       = "GBR",
        [AVCOL_SPC_BT709]     = "bt709",
        [AVCOL_SPC_FCC]       = "fcc",
        [AVCOL_SPC_BT470BG]   = "bt470bg",
        [AVCOL_SPC_SMPTE170M] = "smpte170m",
        [AVCOL_SPC_SMPTE240M] = "smpte240m",
        [AVCOL_SPC_YCOCG]     = "YCgCo",
    };
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    if ((unsigned)val >= FF_ARRAY_ELEMS(name))
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        return NULL;
    return name[val];
}

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

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

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    frame->pts                   =
    frame->pkt_dts               =
    frame->pkt_pts               = AV_NOPTS_VALUE;
    av_frame_set_best_effort_timestamp(frame, AV_NOPTS_VALUE);
    av_frame_set_pkt_duration         (frame, 0);
    av_frame_set_pkt_pos              (frame, -1);
    av_frame_set_pkt_size             (frame, -1);
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    frame->key_frame           = 1;
    frame->sample_aspect_ratio = (AVRational){ 0, 1 };
    frame->format              = -1; /* unknown */
    frame->extended_data       = frame->data;
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    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;
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}

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

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

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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);
}

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

    if (!frame)
        return NULL;

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    frame->extended_data = NULL;
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    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)
{
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
    int ret, i;

    if (!desc)
        return AVERROR(EINVAL);

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

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

    for (i = 0; i < 4 && frame->linesize[i]; i++) {
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        int h = FFALIGN(frame->height, 32);
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        if (i == 1 || i == 2)
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            h = AV_CEIL_RSHIFT(h, desc->log2_chroma_h);
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        frame->buf[i] = av_buffer_alloc(frame->linesize[i] * h + 16 + 16/*STRIDE_ALIGN*/ - 1);
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        if (!frame->buf[i])
            goto fail;

        frame->data[i] = frame->buf[i]->data;
    }
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    if (desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
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        av_buffer_unref(&frame->buf[1]);
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        frame->buf[1] = av_buffer_alloc(AVPALETTE_SIZE);
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        if (!frame->buf[1])
            goto fail;
        frame->data[1] = frame->buf[1]->data;
    }

    frame->extended_data = frame->data;

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

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

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    if (!frame->channels)
        frame->channels = av_get_channel_layout_nb_channels(frame->channel_layout);

    channels = frame->channels;
    planes = planar ? channels : 1;

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    CHECK_CHANNELS_CONSISTENCY(frame);
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    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) {
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        frame->extended_data = av_mallocz_array(planes,
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                                          sizeof(*frame->extended_data));
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        frame->extended_buf  = av_mallocz_array((planes - AV_NUM_DATA_POINTERS),
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                                          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);
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    else if (frame->nb_samples > 0 && (frame->channel_layout || frame->channels > 0))
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        return get_audio_buffer(frame, align);

    return AVERROR(EINVAL);
}

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static int frame_copy_props(AVFrame *dst, const AVFrame *src, int force_copy)
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{
    int i;

    dst->key_frame              = src->key_frame;
    dst->pict_type              = src->pict_type;
    dst->sample_aspect_ratio    = src->sample_aspect_ratio;
    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;
    dst->pkt_pts                = src->pkt_pts;
    dst->pkt_dts                = src->pkt_dts;
    dst->pkt_pos                = src->pkt_pos;
    dst->pkt_size               = src->pkt_size;
    dst->pkt_duration           = src->pkt_duration;
    dst->reordered_opaque       = src->reordered_opaque;
    dst->quality                = src->quality;
    dst->best_effort_timestamp  = src->best_effort_timestamp;
    dst->coded_picture_number   = src->coded_picture_number;
    dst->display_picture_number = src->display_picture_number;
    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);

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#if FF_API_ERROR_FRAME
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    memcpy(dst->error, src->error, sizeof(dst->error));
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FF_ENABLE_DEPRECATION_WARNINGS
#endif
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    for (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;
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        if (force_copy) {
            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);
        } else {
            sd_dst = av_frame_new_side_data(dst, sd_src->type, 0);
            if (!sd_dst) {
                wipe_side_data(dst);
                return AVERROR(ENOMEM);
            }
            sd_dst->buf = av_buffer_ref(sd_src->buf);
            if (!sd_dst->buf) {
                wipe_side_data(dst);
                return AVERROR(ENOMEM);
            }
            sd_dst->data = sd_dst->buf->data;
            sd_dst->size = sd_dst->buf->size;
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        }
        av_dict_copy(&sd_dst->metadata, sd_src->metadata, 0);
    }

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#if FF_API_FRAME_QP
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    dst->qscale_table = NULL;
    dst->qstride      = 0;
    dst->qscale_type  = 0;
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    av_buffer_unref(&dst->qp_table_buf);
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    if (src->qp_table_buf) {
        dst->qp_table_buf = av_buffer_ref(src->qp_table_buf);
        if (dst->qp_table_buf) {
            dst->qscale_table = dst->qp_table_buf->data;
            dst->qstride      = src->qstride;
            dst->qscale_type  = src->qscale_type;
        }
    }
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FF_ENABLE_DEPRECATION_WARNINGS
#endif
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    return 0;
}

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

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    av_assert1(dst->width == 0 && dst->height == 0);
    av_assert1(dst->channels == 0);

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

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    ret = frame_copy_props(dst, src, 0);
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    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;

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

        return ret;
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    }

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

    if (src->extended_buf) {
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        dst->extended_buf = av_mallocz_array(sizeof(*dst->extended_buf),
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                                       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;
            }
        }
    }

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    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;
        }
    }

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    /* duplicate extended data */
    if (src->extended_data != src->data) {
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        int ch = src->channels;
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        if (!ch) {
            ret = AVERROR(EINVAL);
            goto fail;
        }
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        CHECK_CHANNELS_CONSISTENCY(src);
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        dst->extended_data = av_malloc_array(sizeof(*dst->extended_data), ch);
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        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;
}

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AVFrame *av_frame_clone(const AVFrame *src)
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{
    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;

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    if (!frame)
        return;

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    wipe_side_data(frame);
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    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);
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    av_dict_free(&frame->metadata);
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#if FF_API_FRAME_QP
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    av_buffer_unref(&frame->qp_table_buf);
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#endif
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    av_buffer_unref(&frame->hw_frames_ctx);

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    get_frame_defaults(frame);
}

void av_frame_move_ref(AVFrame *dst, AVFrame *src)
{
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    av_assert1(dst->width == 0 && dst->height == 0);
    av_assert1(dst->channels == 0);

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    *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;

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    for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
        if (frame->buf[i])
            ret &= !!av_buffer_is_writable(frame->buf[i]);
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    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;
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    tmp.channels       = frame->channels;
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    tmp.channel_layout = frame->channel_layout;
    tmp.nb_samples     = frame->nb_samples;
    ret = av_frame_get_buffer(&tmp, 32);
    if (ret < 0)
        return ret;

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    ret = av_frame_copy(&tmp, frame);
    if (ret < 0) {
        av_frame_unref(&tmp);
        return ret;
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    }

    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;
}

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int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
{
    return frame_copy_props(dst, src, 1);
}

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

    if (frame->nb_samples) {
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        int channels = frame->channels;
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        if (!channels)
            return NULL;
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        CHECK_CHANNELS_CONSISTENCY(frame);
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        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;
}
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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;

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    if (size > 0) {
        ret->buf = av_buffer_alloc(size);
        if (!ret->buf) {
            av_freep(&ret);
            return NULL;
        }
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        ret->data = ret->buf->data;
        ret->size = size;
    }
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    ret->type = type;

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

    return ret;
}

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

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    if (dst->width  < src->width ||
        dst->height < src->height)
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        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,
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                  dst->format, src->width, src->height);
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    return 0;
}

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

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

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    CHECK_CHANNELS_CONSISTENCY(src);

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    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);
}
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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) {
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            free_side_data(&frame->side_data[i]);
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            frame->side_data[i] = frame->side_data[frame->nb_side_data - 1];
            frame->nb_side_data--;
        }
    }
}
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const char *av_frame_side_data_name(enum AVFrameSideDataType type)
{
    switch(type) {
    case AV_FRAME_DATA_PANSCAN:         return "AVPanScan";
    case AV_FRAME_DATA_A53_CC:          return "ATSC A53 Part 4 Closed Captions";
    case AV_FRAME_DATA_STEREO3D:        return "Stereoscopic 3d metadata";
    case AV_FRAME_DATA_MATRIXENCODING:  return "AVMatrixEncoding";
    case AV_FRAME_DATA_DOWNMIX_INFO:    return "Metadata relevant to a downmix procedure";
    case AV_FRAME_DATA_REPLAYGAIN:      return "AVReplayGain";
    case AV_FRAME_DATA_DISPLAYMATRIX:   return "3x3 displaymatrix";
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    case AV_FRAME_DATA_AFD:             return "Active format description";
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    case AV_FRAME_DATA_MOTION_VECTORS:  return "Motion vectors";
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    case AV_FRAME_DATA_SKIP_SAMPLES:    return "Skip samples";
    case AV_FRAME_DATA_AUDIO_SERVICE_TYPE:          return "Audio service type";
    case AV_FRAME_DATA_MASTERING_DISPLAY_METADATA:  return "Mastering display metadata";
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    case AV_FRAME_DATA_GOP_TIMECODE:                return "GOP timecode";
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    }
    return NULL;
}