Audio Vivid解封装

获取到Audio Vivid封装的mp4文件后，先调用解封装相关接口，选中音频轨，读取每一帧Audio Vivid，送入解码器中（可参考Audio Vivid解码）。详细的API请参考AVDemuxer模块。

在CMake脚本中链接到动态库

target_link_libraries(sample PUBLIC
libnative_media_codecbase.so libnative_media_core.so
libnative_media_acodec.so libnative_media_avdemuxer.so libnative_media_avsource.so
)

添加头文件

//解封装头文件
#include "multimedia/player_framework/native_avdemuxer.h"
#include <string.h>

// 解封装解码传递信息结构体
struct AudioSampleInfo {
std::string audioCodecMime = "";
int32_t audioSampleFormat = 0;
int32_t audioSampleRate = 0;
int32_t audioChannelCount = 0;
int64_t audioChannelLayout = 0;
uint8_t audioCodecConfig[100] = {0};
size_t audioCodecSize = 0;
};

AudioSampleInfo  info;

开发步骤

创建解封装实例。

// ts code获取fd和size
let inputFile = fs.openSync(filepath,fs.OpenMode.READ_ONLY);
if (inputFile) {
    let inputFileState = fs.statSync(inputFile.fd);
    let inputFileSize = inputFileState.size;
}

//C++ code
OH_AVSource *source = OH_AVSource_CreateWithFD(inputFd,0,inputFileSize);
OH_AVDemuxer *demuxer = OH_AVDemuxer_CreateWithSource(source);
auto sourceFormat = std::shared_ptr<OH_AVFormat>(OH_AVSource_GetSourceFormat(source_), OH_AVFormat_Destroy);
int32_t trackCount = 0;
OH_AVFormat_GetIntValue(sourceFormat.get(), OH_MD_KEY_TRACK_COUNT, &trackCount);

选中音频轨。

int32_t trackCount = 0;
OH_AVFormat_GetIntValue(sourceFormat.get(), OH_MD_KEY_TRACK_COUNT, &trackCount);
for (int32_t index = 0; index < trackCount; index++) {
int trackType = -1;
auto trackFormat =
    std::shared_ptr<OH_AVFormat>(OH_AVSource_GetTrackFormat(source_, index), OH_AVFormat_Destroy);
// 获取轨道类型
OH_AVFormat_GetIntValue(trackFormat.get(), OH_MD_KEY_TRACK_TYPE, &trackType);
// 判断当前轨道为音频轨
if (trackType == MEDIA_TYPE_AUD) {
    // 选中音频轨
    OH_AVDemuxer_SelectTrackByID(demuxer, index);
    // 获取位深
    OH_AVFormat_GetIntValue(trackFormat.get(), OH_MD_KEY_AUDIO_SAMPLE_FORMAT, &info.audioSampleFormat);
    // 获取声道数
    OH_AVFormat_GetIntValue(trackFormat.get(), OH_MD_KEY_AUD_CHANNEL_COUNT, &info.audioChannelCount);
    // 获取声道布局
    OH_AVFormat_GetLongValue(trackFormat.get(), OH_MD_KEY_CHANNEL_LAYOUT, &info.audioChannelLayout);
    // 获取采样率
    OH_AVFormat_GetIntValue(trackFormat.get(), OH_MD_KEY_AUD_SAMPLE_RATE, &info.audioSampleRate);
    // 获取额外配置信息
    uint8_t *addr = nullptr;
    OH_AVFormat_GetBuffer(trackFormat.get(), OH_MD_KEY_CODEC_CONFIG, &addr, &info.audioCodecSize);
    memcpy((void *)info.audioCodecConfig, (void *)addr, info.audioCodecSize);
    // 获取解码器类型
    char *audioCodecMime;
    OH_AVFormat_GetStringValue(trackFormat.get(), OH_MD_KEY_CODEC_MIME, const_cast<char const **>(&audioCodecMime));
    info.audioCodecMime = audioCodecMime;
    int32_t trackId = index;
    break;
    }
}

读取每一帧数据。

OH_AVBuffer *buffer;
int32_t ret = OH_AVDemuxer_ReadSampleBuffer(demuxer, trackId, buffer);

释放解封装实例。

int32_t Release()
{
    if (demuxer != nullptr) {
        OH_AVDemuxer_Destroy(demuxer);
        demuxer = nullptr;
    }
    if (source != nullptr) {
        OH_AVSource_Destroy(source);
        source = nullptr;
    }
    return AVCODEC_SAMPLE_ERR_OK;
}

在CMake脚本中链接到动态库​

添加头文件​

开发步骤​

在CMake脚本中链接到动态库

添加头文件

开发步骤