C++ (Cpp) gif_parse_next_image Beispiele

Beispiel #1

Datei: gifdec.c Projekt: Alcantor/FFmpeg

static int gif_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
{
    GifState *s = avctx->priv_data;
    int ret;

    bytestream2_init(&s->gb, avpkt->data, avpkt->size);

    s->frame->pts     = avpkt->pts;
    s->frame->pkt_pts = avpkt->pts;
    s->frame->pkt_dts = avpkt->dts;
    av_frame_set_pkt_duration(s->frame, avpkt->duration);

    if (avpkt->size >= 6) {
        s->keyframe = memcmp(avpkt->data, gif87a_sig, 6) == 0 ||
                      memcmp(avpkt->data, gif89a_sig, 6) == 0;
    } else {
        s->keyframe = 0;
    }

    if (s->keyframe) {
        s->keyframe_ok = 0;
        s->gce_prev_disposal = GCE_DISPOSAL_NONE;
        if ((ret = gif_read_header1(s)) < 0)
            return ret;

        if ((ret = ff_set_dimensions(avctx, s->screen_width, s->screen_height)) < 0)
            return ret;

        av_frame_unref(s->frame);
        if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0)
            return ret;

        av_fast_malloc(&s->idx_line, &s->idx_line_size, s->screen_width);
        if (!s->idx_line)
            return AVERROR(ENOMEM);

        s->frame->pict_type = AV_PICTURE_TYPE_I;
        s->frame->key_frame = 1;
        s->keyframe_ok = 1;
    } else {
        if (!s->keyframe_ok) {
            av_log(avctx, AV_LOG_ERROR, "cannot decode frame without keyframe\n");
            return AVERROR_INVALIDDATA;
        }

        if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
            return ret;

        s->frame->pict_type = AV_PICTURE_TYPE_P;
        s->frame->key_frame = 0;
    }

    ret = gif_parse_next_image(s, s->frame);
    if (ret < 0)
        return ret;

    if ((ret = av_frame_ref(data, s->frame)) < 0)
        return ret;
    *got_frame = 1;

    return bytestream2_tell(&s->gb);
}

Beispiel #2

Datei: gifdec.c Projekt: bwahn/FFmpeg-1

static int gif_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
{
    GifState *s = avctx->priv_data;
    AVFrame *picture = data;
    int ret;

    bytestream2_init(&s->gb, avpkt->data, avpkt->size);

    s->picture.pts          = avpkt->pts;
    s->picture.pkt_pts      = avpkt->pts;
    s->picture.pkt_dts      = avpkt->dts;
    s->picture.pkt_duration = avpkt->duration;

    if (avpkt->size >= 6) {
        s->keyframe = memcmp(avpkt->data, gif87a_sig, 6) == 0 ||
                      memcmp(avpkt->data, gif89a_sig, 6) == 0;
    } else {
        s->keyframe = 0;
    }

    if (s->keyframe) {
        s->keyframe_ok = 0;
        if ((ret = gif_read_header1(s)) < 0)
            return ret;

        if ((ret = av_image_check_size(s->screen_width, s->screen_height, 0, avctx)) < 0)
            return ret;
        avcodec_set_dimensions(avctx, s->screen_width, s->screen_height);

        if (s->picture.data[0])
            avctx->release_buffer(avctx, &s->picture);

        if ((ret = ff_get_buffer(avctx, &s->picture)) < 0) {
            av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
            return ret;
        }

        s->picture.pict_type = AV_PICTURE_TYPE_I;
        s->picture.key_frame = 1;
        s->keyframe_ok = 1;
    } else {
        if (!s->keyframe_ok) {
            av_log(avctx, AV_LOG_ERROR, "cannot decode frame without keyframe\n");
            return AVERROR_INVALIDDATA;
        }

        if ((ret = avctx->reget_buffer(avctx, &s->picture)) < 0) {
            av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
            return ret;
        }

        s->picture.pict_type = AV_PICTURE_TYPE_P;
        s->picture.key_frame = 0;
    }

    ret = gif_parse_next_image(s, got_frame);
    if (ret < 0)
        return ret;
    else if (*got_frame)
        *picture = s->picture;

    return avpkt->size;
}