请求添加venc多通道的支持，但由于libmaixcam_lib是闭源的，所以无法由社区贡献完整的实现 #96
Description
由于sg2002支持多通道venc，但是我们在代码中写死了只使用通道1，所以h264编码和rtsp无法同时运行，即使在代码中修改为不同的通道，也会出现初始化错误或运行时错误，例如无效的通道号、h264和h265无法在同一时间使用（但实际上用的确实都是h264）
我尝试修改MaixCDK的源码，在构造函数中添加选择通道号，并将所有的Encoder相关的MMF_VENC_CHN改为了_venc_channel
- Encoder::Encoder(std::string path, int width, int height, image::Format format, VideoType type, int framerate, int gop, int bitrate, int time_base, bool capture, bool block) {
+ Encoder::Encoder(std::string path, int width, int height, image::Format format, VideoType type, int framerate, int gop, int bitrate, int time_base, bool capture, bool block, int venc_channel) {
_path = path;
_width = width;
_height = height;
@@ -239,6 +239,34 @@ namespace maix::video
_start_encode_ms = 0;
_encode_started = false;
_block = block;
+ _venc_channel = venc_channel;
+
+
+
+ printf("************************************\n");
+ printf("********* VENC CHANNEL = %d *********\n", _venc_channel);
+
+ printf("Encoder Private Members:\n");
+ printf("_path: %s\n", _path.c_str());
+ printf("_width: %d\n", _width);
+ printf("_height: %d\n", _height);
+ printf("_format: %d\n", static_cast<int>(_format));
+ printf("_type: %d\n", static_cast<int>(_type));
+ printf("_framerate: %d\n", _framerate);
+ printf("_gop: %d\n", _gop);
+ printf("_bitrate: %d\n", _bitrate);
+ printf("_time_base: %d\n", _time_base);
+ printf("_need_capture: %s\n", _need_capture ? "true" : "false");
+ printf("_capture_image: %p\n", _capture_image);
+ printf("_camera: %p\n", _camera);
+ printf("_bind_camera: %p\n", _bind_camera);
+ printf("_start_encode_ms: %ld\n", _start_encode_ms);
+ printf("_encode_started: %s\n", _encode_started ? "true" : "false");
+ printf("_block: %s\n", _block ? "true" : "false");
+ printf("_venc_channel: %d\n", _venc_channel);
+
+ printf("************************************\n");
+
err::check_bool_raise(format == image::Format::FMT_YVU420SP, "Encoder only support FMT_YVU420SP format!");
video::VideoType video_type = _get_video_type(path.c_str(), type);
@@ -264,7 +292,7 @@ namespace maix::video
err::check_raise(err::ERR_RUNTIME, "init mmf failed!");
}
- if (0 != mmf_add_venc_channel_v2(MMF_VENC_CHN, &cfg)) {
+ if (0 != mmf_add_venc_channel_v2(_venc_channel, &cfg)) {但是即便如此，编译运行后仍然无法实现两个编码器同时工作
************************************
********* VENC CHANNEL = 2 *********
Encoder Private Members:
_path:
_width: 1280
_height: 720
_format: 8
_type: 9
_framerate: 60
_gop: 50
_bitrate: 3000000
_time_base: 1000
_need_capture: false
_capture_image: 0
_camera: 0
_bind_camera: 0
_start_encode_ms: 0
_encode_started: false
_block: true
_venc_channel: 2
************************************
************************************
********* VENC CHANNEL = 1 *********
Encoder Private Members:
_path:
_width: 640
_height: 480
_format: 8
_type: 9
_framerate: 30
_gop: 50
_bitrate: 3000000
_time_base: 1000
_need_capture: false
_capture_image: 0
_camera: 0
_bind_camera: 0
_start_encode_ms: 0
_encode_started: false
_block: true
_venc_channel: 1
************************************
264 and 265 encoding can only use one at the same time!
-- [E] Exception: : Runtime error: mmf venc init failed!
maix multi-media driver released.
ISP Vipipe(0) Free pa(0x8a52c000) va(0x0x3fefe3b000)
#
通过查看私有so的信息，期望咱们能够在libmaixcam_lib.so中支持多通道，感谢！
(base) satuo@satuo-INVALID:~$ readelf -p .rodata libmaixcam_lib.so | grep "encoding can only use one at the same time"
[ 2908] 264 and 265 encoding can only use one at the same time!^M
(base) satuo@satuo-INVALID:~$