Android：使用OMXCodec作为MediaSource时，MPEG4Writer无法启动 [英] Android: MPEG4Writer fails to start when using OMXCodec as MediaSource
问题描述
我想从一个字节数组缓冲区编码视频，并且这样做，我使用 MPEG4Writer API从本机代码。
I'm trying to encode a video from a byte array buffer and to do so I'm using MPEG4Writer API from native code.
我创建了我的自定义 MediaSource 类来提供数据，我将它包装 OMXCodec
I have created my custom MediaSource class to provide the data and I'm wrapping it with OMXCodec to give it to MPEG4Writer:
sp<MediaSource> mVideoEncoder = OMXCodec::Create(client.interface(), omxEncMeta, true, mVideoOutSource);
mVideoEncoder->start();
mVideoOutSource 是我的自定义 MediaSource class， omxEncMeta 如下：
mVideoOutSource is my custom MediaSource class, omxEncMeta is the following:
int32_t colorFormat = OMX_COLOR_FormatYUV420SemiPlanar;
int32_t width = 480;
int32_t height = 360;
int32_t frameRate = 24;
int32_t bitRate = 500 * 1024;
int32_t iFrameInterval = 1;
sp<MetaData> omxEncMeta = new MetaData;
omxEncMeta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_AVC);
omxEncMeta->setInt32(kKeyColorFormat, colorFormat);
omxEncMeta->setInt32(kKeyWidth, width);
omxEncMeta->setInt32(kKeyHeight, height);
omxEncMeta->setInt32(kKeyStride, width);
omxEncMeta->setInt32(kKeySliceHeight, height);
omxEncMeta->setInt32(kKeyFrameRate, frameRate);
omxEncMeta->setInt32(kKeySampleRate, frameRate);
omxEncMeta->setInt32(kKeyBitRate, bitRate);
omxEncMeta->setInt32(kKeyIFramesInterval, iFrameInterval);
但是当我调用 start（）它会返回错误代码 UNKNOWN_ERROR 。
but when I call start() method it returns the error code UNKNOWN_ERROR.
相反，如果我尝试给 MPEG4Writer 直接我的自定义 MediaSource （不包装它 OMXCodec 停止录制与错误缺少编解码器特定数据（大约12帧后），我认为这是因为我的自定义 MediaSource
Instead, if I try to give to MPEG4Writer directly my custom MediaSource (without wrapping it with OMXCodec it starts successfully but eventually it will stop recording with the error Missing codec specific data (after about 12 frames), and I think this is because my custom MediaSource provides only informations about the actual frames but nothing about the codec format.
我确定我缺少一些与 OMXCodec ，但我不知道什么...有没有人可以提供一个自定义 MediaSource 编码的工作示例？或给我一些提示说明为什么这不工作？
如果您需要更多信息，请问，谢谢！
I'm sure I'm missing something with OMXCodec, but I can't figure out what... Is there anyone who could provide me with a working example of a custom MediaSource for encoding? Or give me some hints on why this is not working at all?
If you need more informations just ask, thanks!
EDIT ：我正在开发这个针对API 14，所以请不要建议我使用 MediaCodec 从API 16：）
EDIT: I'm developing this against API 14 so please don't suggest me to use MediaCodec from API 16 :)
EDIT ：这是我开始 MPEG4Writer 的方式：
EDIT: This is how I'm starting MPEG4Writer:
int32_t outputFormat = OUTPUT_FORMAT_MPEG_4;
int64_t startTimeUs = systemTime() / 1000;
int32_t totalBitRate = bitRate;
sp<MetaData> meta = new MetaData;
meta->setInt64(kKeyTime, startTimeUs);
meta->setInt32(kKeyFileType, outputFormat);
meta->setInt32(kKeyBitRate, totalBitRate);
sp<MPEG4Writer> mWriter = new MPEG4Writer("/sdcard/encode_manual.mp4");
mWriter->addSource(mVideoEncoder);
status_t error = mWriter->start(meta.get());
if (error != OK) {
LOGE("Writer NOT started! %x", error);
} else {
LOGI("Writer started!");
}
logcat（ adb logcat OMXClient：V OMXCodec：V *：W ）：
W/ResourceType( 370): Skipping entry 0x7f04002f in package table 0 because it is not complex!
E/ ( 4127): Can't open file for reading
E/ ( 4127): Can't open file for reading
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): omx_video(): Inside Constructor()
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): omx_venc(): Inside component_init()
E/OMX-VENC-720p( 155): bool venc_dev::venc_validate_profile_level(OMX_U32*, OMX_U32*): Returning with eProfile = 1Level = 4
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): bool venc_dev::venc_open(OMX_U32)(): Init Profile/Level setting success
E/OMX-VENC-720p( 155): vidc.venc.debug.sliceinfo value is 0
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): Component_init return value = 0x0
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): WARNING: Requested i/p bufsize[40960],Driver's updated i/p bufsize = 262144
E/OMX-VENC-720p( 155): bool venc_dev::venc_validate_profile_level(OMX_U32*, OMX_U32*): Returning with eProfile = 1Level = 256
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): bool venc_dev::venc_set_param(void*, OMX_INDEXTYPE)(): Profile/Level setting success
E/OMX-VENC-720p( 155): bool venc_dev::venc_validate_profile_level(OMX_U32*, OMX_U32*): Returning with eProfile = 1Level = 64
E/OMX-VENC-720p( 155): Calling set level (Framerate) with 15
E/OMX-VENC-720p( 155): bool venc_dev::venc_validate_profile_level(OMX_U32*, OMX_U32*): Returning with eProfile = 1Level = 64
E/OMX-VENC-720p( 155): Calling set level (Bitrate) with 15
E/OMX-VENC-720p( 155): get_parameter: OMX_IndexParamVideoProfileLevelQuerySupported for Input port returned Profile:1, Level:2048
E/OMX-VENC-720p( 155): Profile/Level set equal to 1/64
E/OMX-VENC-720p( 155): bool venc_dev::venc_validate_profile_level(OMX_U32*, OMX_U32*): Returning with eProfile = 1Level = 64
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): venc_set_intra_period: nPFrames = 25 nBFrames = 0
E/OMX-VENC-720p( 155): bool venc_dev::venc_validate_profile_level(OMX_U32*, OMX_U32*): Returning with eProfile = 1Level = 64
E/OMX-VENC-720p( 155): Calling set level (Bitrate) with 15
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): allocate_input_buffer()::
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): allocate_input_buffer()::
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): allocate_input_buffer()::
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): allocate_output_buffer()::
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): actual cnt = 5
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): allocate_output_buffer()::
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): actual cnt = 5
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): allocate_output_buffer()::
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): actual cnt = 5
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): allocate_output_buffer()::
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): actual cnt = 5
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): allocate_output_buffer()::
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): actual cnt = 5
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): unsigned int venc_dev::venc_start()(): Check Profile/Level set in driver before start
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): unsigned int venc_dev::venc_start()(): Driver Profile[3]/Level[15] successfully SET
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): ENC_CONFIG: Codec: 2, Profile 3, level : 15
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): ENC_CONFIG: Width: 480, Height:360, Fps: 25
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): ENC_CONFIG: Bitrate: 512000, RC: 3, I-Period: 25
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): ENC_CONFIG: qpI: 0, qpP: 80, qpb: 0
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): ENC_CONFIG: VOP_Resolution: 4343391, Slice-Mode: 1, Slize_Size: 0
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): ENC_CONFIG: EntropyMode: 1, CabacModel: 0
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): ENC_CONFIG: DB-Mode: 2, alpha: 0, Beta: 0
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): ENC_CONFIG: IntraMB/Frame: 18, HEC: 843271745
E/OMX-VENC-720p( 155): Width 480, Height 360, w_round 480, h_round 368, yuv_size 294912 alignment 8192 count 2
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): Allocated virt:0x4432e000, FD: 145 of size 294912
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): Allocated virt:0x4432e000, FD: 145 of size 294912 at index: 0
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): Allocated virt:0x44895000, FD: 147 of size 294912
E/OMX-VENC-720p( 155):
E/OMX-VENC-720p( 155): Allocated virt:0x44895000, FD: 147 of size 294912 at index: 1
E/TestEnc-JNI( 4127): Writer NOT started! 80000000
推荐答案
我只是想出了 ）问题：我在上调用 start（） > 之前调用。 start（） c $ c> UNKNOWN_ERROR
I just figured out my (dumb) issue: I was calling start() on mVideoEncoder (the OMXCodec instance) before calling start() on MPEG4Writer, and this was giving the UNKNOWN_ERROR.
我通过调用 start（） MPEG4Writer 实例。
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