Function gif_encode_frame

libavcodec/gif.c:475–522

}

static int gif_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                            const AVFrame *pict, int *got_packet)
{
    GIFContext *s = avctx->priv_data;
    uint8_t *outbuf_ptr, *end;
    const uint32_t *palette = NULL;
    int ret;

    if ((ret = ff_alloc_packet(avctx, pkt, avctx->width*avctx->height*7/5 + FF_INPUT_BUFFER_MIN_SIZE)) < 0)
        return ret;
    outbuf_ptr = pkt->data;
    end        = pkt->data + pkt->size;

    if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
        palette = (uint32_t*)pict->data[1];

        if (!s->palette_loaded) {
            memcpy(s->palette, palette, AVPALETTE_SIZE);
            s->transparent_index = get_palette_transparency_index(palette);
            s->palette_loaded = 1;
            if (s->use_global_palette)
                palette = NULL;
        } else if (!memcmp(s->palette, palette, AVPALETTE_SIZE)) {
            palette = NULL;
        }
    }

    gif_image_write_image(avctx, &outbuf_ptr, end, palette,
                          pict->data[0], pict->linesize[0], pkt);
    if (!s->last_frame && !s->image) {
        s->last_frame = av_frame_alloc();
        if (!s->last_frame)
            return AVERROR(ENOMEM);
    }

    if (!s->image) {
        ret = av_frame_replace(s->last_frame, pict);
        if (ret < 0)
            return ret;
    }

    pkt->size   = outbuf_ptr - pkt->data;
    if (s->image || !avctx->frame_num)
        pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    return 0;
}

static av_cold int gif_encode_close(AVCodecContext *avctx)
{