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Copy pathAacEncoder.cpp
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190 lines (153 loc) · 4.73 KB
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#include "AacEncoder.h"
#include <QDebug>
AacEncoder::AacEncoder()
{
}
AacEncoder::~AacEncoder()
{
}
int AacEncoder::InitEncode(int sample_rate, int bit_rate, AVSampleFormat sample_fmt, int chanel_layout)
{
//avcodec_register_all();
av_register_all();
const AVCodec* codec = nullptr;
//while ((codec = av_codec_next(codec))) {
// if (codec->encode2 && codec->type == AVMediaType::AVMEDIA_TYPE_AUDIO) {
// qDebug() << "Codec Name :" << codec->name;
// qDebug() << "Type: " << av_get_media_type_string(codec->type);
// qDebug() << "Description: " << (codec->long_name ? codec->long_name : codec->name);
// qDebug() << "---";
// }
//}
/* find the MP2 encoder */
codec = avcodec_find_encoder_by_name("libfdk_aac");
//codec = avcodec_find_encoder(AV_CODEC_ID_AAC);
if (!codec) {
fprintf(stderr, "Codec not found\n");
exit(1);
}
qDebug() << "codec name: " << codec->name;
qDebug() << "codec long name: " << codec->long_name;
const enum AVSampleFormat* p = codec->sample_fmts;
while (*p != AV_SAMPLE_FMT_NONE) {
qDebug() << "supoort codec fmt : " << av_get_sample_fmt_name(*p);
p++;
}
audioCodecCtx = avcodec_alloc_context3(codec);
if (!audioCodecCtx) {
fprintf(stderr, "Could not allocate audio codec context\n");
exit(1);
}
//打印看到只支持 AV_SAMPLE_FMT_S16，所以这里写死
audioCodecCtx->sample_rate = sample_rate;
audioCodecCtx->channel_layout = chanel_layout;
audioCodecCtx->channels = av_get_channel_layout_nb_channels(audioCodecCtx->channel_layout);
audioCodecCtx->sample_fmt = sample_fmt;
audioCodecCtx->bit_rate = bit_rate;
audioCodecCtx->profile = FF_PROFILE_AAC_HE;
//检查是否支持fmt
if (!check_sample_fmt(codec, audioCodecCtx->sample_fmt)) {
//fprintf(stderr, "Encoder does not support sample format %s",av_get_sample_fmt_name(audioCodecCtx->sample_fmt));
qDebug() << "Encoder does not support sample format " << av_get_sample_fmt_name(audioCodecCtx->sample_fmt);
exit(1);
}
if (!check_sample_rate(codec, audioCodecCtx->sample_rate)) {
//fprintf(stderr, "Encoder does not support sample format %s",av_get_sample_fmt_name(audioCodecCtx->sample_fmt));
qDebug() << "Encoder does not support sample rate " << audioCodecCtx->sample_rate;
exit(1);
}
// Set ADTS flag,设置后，就没有单个adts头了
audioCodecCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
/* open it */
if (avcodec_open2(audioCodecCtx, codec, NULL) < 0) {
fprintf(stderr, "Could not open codec\n");
exit(1);
}
//编码输入数据的长度 1024* channel*fmt
frame_byte_size = audioCodecCtx->frame_size * audioCodecCtx->channels * 2;
pkt = av_packet_alloc();
if (!pkt) {
fprintf(stderr, "could not allocate the packet\n");
exit(1);
}
/* frame containing input raw audio */
frame = av_frame_alloc();
if (!frame) {
fprintf(stderr, "Could not allocate audio frame\n");
exit(1);
}
frame->nb_samples = audioCodecCtx->frame_size;
frame->format = audioCodecCtx->sample_fmt;
frame->channel_layout = audioCodecCtx->channel_layout;
/* allocate the data buffers */
int ret = av_frame_get_buffer(frame, 0);
if (ret < 0) {
fprintf(stderr, "Could not allocate audio data buffers\n");
exit(1);
}
#ifdef WRITE_CAPTURE_AAC
if (!aac_out_file) {
aac_out_file = fopen("ouput.aac", "wb");
if (aac_out_file == nullptr)
{
}
}
#endif // WRITE_CAPTURE_AAC
//保存编码信息
codec_config.codec_type = static_cast<int>(AVMediaType::AVMEDIA_TYPE_AUDIO);
codec_config.codec_id = static_cast<int>(AV_CODEC_ID_AAC);
codec_config.sample_rate = audioCodecCtx->sample_rate;
codec_config.channel = audioCodecCtx->channels;
codec_config.format = audioCodecCtx->sample_fmt;
return 0;
}
int AacEncoder::Encode(const char* src_buf, int src_len, unsigned char* dst_buf)
{
if (frame_byte_size != src_len)
{
//编码器输入的数据不符合一帧数据，要求的pcm数据长度
qDebug() << "src_len is not " << frame_byte_size;
}
int planar = av_sample_fmt_is_planar(audioCodecCtx->sample_fmt);
if (planar)
{
// 我编码用的非planer结构
}
else
{
memcpy(frame->data[0], src_buf, src_len);
}
int ret;
/* send the frame for encoding */
ret = avcodec_send_frame(audioCodecCtx, frame);
if (ret < 0) {
fprintf(stderr, "Error sending the frame to the encoder\n");
exit(1);
}
ret = avcodec_receive_packet(audioCodecCtx, pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
qDebug() << "Error encoding audio frame " << ret;
return 0;
}
else if (ret < 0) {
qDebug()<< "Error encoding audio frame" << ret;
exit(1);
}
int pkt_len = pkt->size;
if (dst_buf != nullptr)
{
memcpy(dst_buf, pkt->data, pkt->size);
}
#ifdef WRITE_CAPTURE_AAC
fwrite(pkt->data, 1, pkt->size, aac_out_file);
#endif
av_packet_unref(pkt);
return pkt_len;
}
int AacEncoder::StopEncode()
{
av_frame_free(&frame);
av_packet_free(&pkt);
avcodec_free_context(&audioCodecCtx);
return 0;
}