ffmpeg保存avframe中pcm数据到文件

ffmpeg保存avframe中pcm数据到文件。
代码如下：

			data_size = av_get_bytes_per_sample(dec_ctx->sample_fmt);
            if (data_size < 0) {
                LOGI("get size error");
                return -1;
            }


            LOGI("audio frame size:%d---%d---%d", data_size, frame->nb_samples, frame->sample_rate);
            frameBufferSize = frame->nb_samples*data_size*dec_ctx->channels;
            if (frameBuf==NULL)
            {
                frameBuf= static_cast<unsigned char *>(malloc(
                        static_cast<size_t>(frameBufferSize)));
            }

            sum=0;
            for (i = 0; i < frame->nb_samples; i++)
            {
                for (ch = 0; ch < dec_ctx->channels; ch++)
                {
                    memcpy(frameBuf+sum, frame->data[ch] + data_size*i,
                           static_cast<size_t>(data_size));
                    sum+=data_size;
                }
            }
			

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