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Copy pathVideoEncodeFF.cpp
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280 lines (234 loc) · 7.01 KB
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#include "VideoEncodeFF.h"
#include <QDebug>
#include <stdint.h>
//#include "x264.h"
int VideoEncodeFF::InitEncode(int width, int height, int fps, int bitrate, const char* profile)
{
if (width <= 0 || height <= 0)
return -1;
int ret = 0;
av_register_all();
AVCodec* codec = NULL;
//while ((codec = av_codec_next(codec))) {
// if (codec->encode2 && codec->type == AVMediaType::AVMEDIA_TYPE_VIDEO) {
// 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() << "---";
// }
//}
codec = avcodec_find_encoder_by_name("libx264");
//codec = avcodec_find_encoder(AVCodecID::AV_CODEC_ID_H264);
if (codec == NULL) {
//qDebug() << "cannot find video codec id: " << codec->id;
return -1;
}
qDebug() << "codec name: " << codec->name;
qDebug() << "codec long name: " << codec->long_name;
videoCodecCtx = avcodec_alloc_context3(codec);
if (videoCodecCtx == nullptr)
{
qDebug() << "alloc context3 afild: " << codec->long_name;
return -1;
}
pkt = av_packet_alloc();
if (!pkt)
exit(1);
// 设置编码参数
videoCodecCtx->bit_rate = bitrate;
videoCodecCtx->width = width;
videoCodecCtx->height = height;
videoCodecCtx->time_base = { 1,fps };
videoCodecCtx->framerate = { fps,1 };
videoCodecCtx->gop_size = 10;
videoCodecCtx->max_b_frames = 0;
videoCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
std::string strProfile = profile;
if (strProfile == "main")
{
videoCodecCtx->profile = FF_PROFILE_H264_MAIN;
}
else if (strProfile == "base")
{
videoCodecCtx->profile = FF_PROFILE_H264_BASELINE;
}
else
{
videoCodecCtx->profile = FF_PROFILE_H264_HIGH;
}
ret = av_opt_set(videoCodecCtx->priv_data, "preset", "ultrafast", 0);
if (ret != 0)
{
qDebug() << "set opt preset error";
}
ret = av_opt_set(videoCodecCtx->priv_data,"tune","zerolatency", 0);
if (ret != 0)
{
qDebug() << "set opt tune error";
}
//x264_param_t* x264_param = (x264_param_t*)videoCodecCtx->priv_data;
//x264_param_default_preset(x264_param, "ultrafast", "zerolatency");
//x264_param_apply_profile(x264_param, "high");
//决定了是否在每个i帧前面带sps，pps，如果全局head ，videoCodecCtx->extradata里面就会带sps，pps
videoCodecCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
// 打开编码器
ret = avcodec_open2(videoCodecCtx, codec, NULL);
if (ret < 0) {
qDebug() << "avcodec_open2 filed ";
exit(1);
}
frame = av_frame_alloc();
if (!frame) {
fprintf(stderr, "Could not allocate video frame\n");
exit(1);
}
frame->format = videoCodecCtx->pix_fmt;
frame->width = videoCodecCtx->width;
frame->height = videoCodecCtx->height;
ret = av_frame_get_buffer(frame, 0);
if (ret < 0) {
fprintf(stderr, "Could not allocate the video frame data\n");
exit(1);
}
#ifdef WRITE_CAPTURE_264
if (!h264_out_file) {
h264_out_file = fopen("ouput.264", "wb");
if (h264_out_file == nullptr)
{
qDebug() << "Open 264 file failed";
}
}
#endif // WRITE_CAPTURE_264
memset(frame->data[0], 0, videoCodecCtx->height * frame->linesize[0]); // Y
memset(frame->data[1], 0, videoCodecCtx->height / 2 * frame->linesize[1]); // U
memset(frame->data[2], 0, videoCodecCtx->height / 2 * frame->linesize[2]); // V
// 设置全局头部标志
if (videoCodecCtx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
}
else
{
//没有设置全局头，那么就编码一帧数据，获取sps，pps。
// 发送空帧到编码器以触发 SPS 和 PPS 的生成
if (avcodec_send_frame(videoCodecCtx, frame) < 0) {
qDebug() << "Failed to send frame";
av_frame_free(&frame);
avcodec_free_context(&videoCodecCtx);
return -1;
}
ret = avcodec_receive_packet(videoCodecCtx, 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);
}
#ifdef WRITE_CAPTURE_264
fwrite(pkt->data, 1, pkt->size, h264_out_file);
#endif // WRITE_CAPTURE_264
int frame_type = pkt->data[4] & 0x1f;
if (frame_type == 7 && receive_first_frame)
{
//sps,pps,
CopySpsPps(pkt->data, pkt->size);
receive_first_frame = false;
}
}
// 保存编码信息，用于外部获取
codec_config.codec_type = static_cast<int>(AVMEDIA_TYPE_VIDEO);
codec_config.codec_id = static_cast<int>(AV_CODEC_ID_H264);
codec_config.width = videoCodecCtx->width;
codec_config.height = videoCodecCtx->height;
codec_config.format = videoCodecCtx->pix_fmt;
codec_config.fps = fps;
return 0;
}
unsigned int VideoEncodeFF::Encode(unsigned char* src_buf, unsigned char* dst_buf)
{
int ylen = frame->linesize[0] * videoCodecCtx->coded_height;
int ulen = frame->linesize[1] * videoCodecCtx->coded_height /2 ;
int vlen = frame->linesize[2] * videoCodecCtx->coded_height / 2;
memcpy(frame->data[0], src_buf, ylen);
memcpy(frame->data[1], src_buf + ylen, ulen);
memcpy(frame->data[2], src_buf + ylen+ulen, vlen);
frame->pts = pts;
pts++;
int ret = avcodec_send_frame(videoCodecCtx, frame);
if (ret < 0) {
fprintf(stderr, "Error sending a frame for encoding\n");
exit(1);
}
ret = avcodec_receive_packet(videoCodecCtx, pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
return 1;
else if (ret < 0) {
fprintf(stderr, "Error during encoding\n");
exit(1);
}
#ifdef WRITE_CAPTURE_264
fwrite(pkt->data, 1, pkt->size, h264_out_file);
#endif // WRITE_CAPTURE_264
if (dst_buf != nullptr)
{
memcpy(dst_buf, pkt->data, pkt->size);
}
ret = pkt->size;
av_packet_unref(pkt);
return ret;
}
void VideoEncodeFF::CopySpsPps(uint8_t* src, int size)
{
int sps_pps_size = size;
for (int i = 0;i < size -4;i++)
{
if (src[i] == 0 && src[i+1] == 0 && src[i + 2] == 0 && src[i + 3] == 1 && (src[i + 4]&0x1f) == 5)
{
sps_pps_size = i + 1;
break;
}
if (src[i] == 0 && src[i + 1] == 0 && src[i + 2] == 1 && (src[i + 3] & 0x1f) == 5)
{
sps_pps_size = i + 1;
break;
}
}
videoCodecCtx->extradata = (uint8_t*)av_mallocz(sps_pps_size);
videoCodecCtx->extradata_size = sps_pps_size;
memcpy(videoCodecCtx->extradata,src, sps_pps_size);
return;
uint8_t* sps_data = nullptr;
uint8_t* pps_data = nullptr;
int sps_size = 0;
int pps_size = 0;
if (videoCodecCtx->extradata && videoCodecCtx->extradata_size > 0) {
// 解析 extradata 中的 SPS 和 PPS 数据
int index = 0;
if (videoCodecCtx->extradata[index++] == 0x00 && videoCodecCtx->extradata[index++] == 0x00
&& videoCodecCtx->extradata[index++] == 0x00 && videoCodecCtx->extradata[index++] == 0x01) {
// 找到了起始码
int nal_type = videoCodecCtx->extradata[index] & 0x1F;
if (nal_type == 7) { // SPS
sps_data = videoCodecCtx->extradata + index;
sps_size = videoCodecCtx->extradata_size - index;
}
else if (nal_type == 8) { // PPS
pps_data = videoCodecCtx->extradata + index;
pps_size = videoCodecCtx->extradata_size - index;
}
}
}
}
int VideoEncodeFF::StopEncode()
{
avcodec_free_context(&videoCodecCtx);
av_frame_free(&frame);
av_packet_free(&pkt);
#ifdef WRITE_CAPTURE_264
if (h264_out_file) {
fclose(h264_out_file);
h264_out_file = nullptr;
}
#endif
return 0;
}