Function ipvideo_decode_frame

libavcodec/interplayvideo.c:1190–1342

}

static int ipvideo_decode_frame(AVCodecContext *avctx, AVFrame *frame,
                                int *got_frame, AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    IpvideoContext *s = avctx->priv_data;
    int ret;
    int send_buffer;
    int frame_format;
    int video_data_size;

    if (av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, NULL)) {
        av_frame_unref(s->last_frame);
        av_frame_unref(s->second_last_frame);
        av_frame_unref(s->cur_decode_frame);
        av_frame_unref(s->prev_decode_frame);
    }

    if (!s->cur_decode_frame->data[0]) {
        ret = ff_get_buffer(avctx, s->cur_decode_frame, 0);
        if (ret < 0)
            return ret;

        ret = ff_get_buffer(avctx, s->prev_decode_frame, 0);
        if (ret < 0) {
            av_frame_unref(s->cur_decode_frame);
            return ret;
        }
    }

    if (buf_size < 8)
        return AVERROR_INVALIDDATA;

    frame_format         = AV_RL8(buf);
    send_buffer          = AV_RL8(buf + 1);
    video_data_size      = AV_RL16(buf + 2);
    s->decoding_map_size = AV_RL16(buf + 4);
    s->skip_map_size     = AV_RL16(buf + 6);

    switch (frame_format) {
    case 0x06:
        if (s->decoding_map_size) {
            av_log(avctx, AV_LOG_ERROR, "Decoding map for format 0x06\n");
            return AVERROR_INVALIDDATA;
        }

        if (s->skip_map_size) {
            av_log(avctx, AV_LOG_ERROR, "Skip map for format 0x06\n");
            return AVERROR_INVALIDDATA;
        }

        if (s->is_16bpp) {
            av_log(avctx, AV_LOG_ERROR, "Video format 0x06 does not support 16bpp movies\n");
            return AVERROR_INVALIDDATA;
        }

        /* Decoding map for 0x06 frame format is at the top of pixeldata */
        s->decoding_map_size = ((s->avctx->width / 8) * (s->avctx->height / 8)) * 2;