Function imm5_decode_frame

libavcodec/imm5.c:85–161

}

static int imm5_decode_frame(AVCodecContext *avctx, AVFrame *frame,
                             int *got_frame, AVPacket *avpkt)
{
    IMM5Context *ctx = avctx->priv_data;
    AVCodecContext *codec_avctx = ctx->h264_avctx;
    int ret;

    if (avpkt->size > 24 && avpkt->data[8] <= 1 && AV_RL32(avpkt->data + 4) + 24ULL <= avpkt->size) {
        int codec_type = avpkt->data[1];
        int index = avpkt->data[10];
        int new_size = AV_RL32(avpkt->data + 4);
        int offset, off;

        if (codec_type == 0xA) {
            codec_avctx = ctx->hevc_avctx;
        } else if (index == 17) {
            index = 4;
        } else if (index == 18) {
            index = 5;
        }

        if (index >= 1 && index <= 12) {
            ret = av_packet_make_writable(avpkt);
            if (ret < 0)
                return ret;

            index -= 1;
            off = offset = IMM5_units[index].len;
            if (codec_type == 2) {
                offset += IMM5_units[12].len;
            } else {
                offset += IMM5_units[13].len;
            }

            avpkt->data += 24 - offset;
            avpkt->size = new_size + offset;

            memcpy(avpkt->data, IMM5_units[index].bits, IMM5_units[index].len);
            if (codec_type == 2) {
                memcpy(avpkt->data + off, IMM5_units[12].bits, IMM5_units[12].len);
            } else {
                memcpy(avpkt->data + off, IMM5_units[13].bits, IMM5_units[13].len);
            }
        } else {
            avpkt->data += 24;
            avpkt->size -= 24;
        }
    }

    ret = avcodec_send_packet(codec_avctx, avpkt);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
        return ret;
    }

    ret = avcodec_receive_frame(codec_avctx, frame);
    if (ret == AVERROR(EAGAIN))
        return avpkt->size;