ffmpeg 音视频编码器需要查看支持才能用否则打不开编码器。
下面代码将展示查看ffmpeg中音频支持声道，采样率，样本情况；视频支持输入yuv格式情况，具体看下面代码。
< name="code" class="cpp">int audio_support(AVCodec * pCodec,int *channel,int * playout,int *samplePerSec,AVSampleFormat_t * sample_fmt){ //支持的声道 if(NULL != pCodec->channel_layouts) { uint64_t layout = av_get_default_channel_layout(*channel); if(0 == layout) { return 0; } int i = 0; int j = 0; while(0 != pCodec->channel_layouts[j]) { printf("pCodec->channel_layouts[j] : %d\n",pCodec->channel_layouts[j]); ++j; } while(0 != pCodec->channel_layouts[i]) { if(layout == pCodec->channel_layouts[i]) { break; } ++i; } //未找到 if(0 == pCodec->channel_layouts[i]) { *playout = pCodec->channel_layouts[i-1]; *channel = av_get_channel_layout_nb_channels(*playout); } } //支持的采样率 if(NULL != pCodec->supported_samplerates) { int i = 0; int j = 0; while(0 != pCodec->supported_samplerates[j]) { printf("pCodec->supported_samplerates[j] : %d\n",pCodec->supported_samplerates[j]); ++j; } while(0 != pCodec->supported_samplerates[i]) { if(*samplePerSec == pCodec->supported_samplerates[i]) { break; } ++i; } //未找到 if(0 == pCodec->supported_samplerates[i]) { *samplePerSec = pCodec->supported_samplerates[i-1]; } } //支持的样本 if(NULL != pCodec->sample_fmts) { int i = 0; int j = 0; while(-1 != pCodec->sample_fmts[j]) { printf("pCodec->sample_fmts[j] : %d\n",pCodec->sample_fmts[j]); ++j; } while(-1 != pCodec->sample_fmts[i]) { if(*sample_fmt == pCodec->sample_fmts[i]) { break; } ++i; } //未找到 if(-1 == pCodec->sample_fmts[i]) { *sample_fmt = (AVSampleFormat_t)pCodec->sample_fmts[i-1]; } } return 1;}int video_support(AVCodec * pCodec,AVPixelFormat * video_pixelfromat){ //支持的yuv格式 if(NULL != pCodec->pix_fmts) { int i = 0; int j = 0; while(0 != pCodec->pix_fmts[j]) { printf("pCodec->pix_fmts[j] : %d\n",pCodec->pix_fmts[j]); ++j; } while(0 != pCodec->pix_fmts[i]) { if(*video_pixelfromat == pCodec->pix_fmts[i]) { break; } ++i; } //未找到 if(-1 == pCodec->pix_fmts[i]) { *video_pixelfromat = pCodec->pix_fmts[i-1]; } } return 1;}输入支持情况如图：
上面是音频编码器支持的采样率，样本，以及视频支持的输入yuv格式。
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