mpp_decoder 参考 demo

以下 demo 为基本流程调用，具体实现可以参考代码 mpp/mpp_test/picture_decoder_test.c

//* 1.创建 mpp_decoder 对象
struct mpp_decoder* dec = mpp_decoder_create(type);

struct decode_config config;
config.bitstream_buffer_size = (file_len + 1023) & (~1023);
config.extra_frame_num = 0;
config.packet_count = 1;
config.pix_fmt = MPP_FMT_ARGB_8888;

//* 2. 初始化 mpp_decoder
mpp_decoder_init(dec, &config);

//* 3. 获取一个空的 packet
struct mpp_packet packet;
memset(&packet, 0, sizeof(struct mpp_packet));
mpp_decoder_get_packet(dec, &packet, file_len);

//* 4. 把视频码流数据拷贝到 packet
fread(packet.data, 1, file_len, fp);
packet.size = file_len;
packet.flag = PACKET_FLAG_EOS;

//* 5. 归还 packet
mpp_decoder_put_packet(dec, &packet);

//* 6. 解码该笔码流数据
mpp_decoder_decode(dec);

//* 7. 获取解码后视频帧数据
struct mpp_frame frame;
memset(&frame, 0, sizeof(struct mpp_frame));
mpp_decoder_get_frame(dec, &frame);

//* 8. 显示该视频帧
// render_frame...

//* 9. 归还该视频帧
mpp_decoder_put_frame(dec, &frame);

//* 10. 销毁 mpp_decoder
mpp_decoder_destory(dec);