前一篇介绍过用x264编码文件,ffmpeg内部也是用x264编码,这里记录下简单的用ffmpeg的编码
直接上代码:
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onst char* SRC_FILE = "1.mp4";
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const char* OUT_FILE = "outfile.h264";
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typedef struct X264Context {
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AVClass *pclass;
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x264_param_t params;
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x264_t *enc;
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x264_picture_t pic;
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uint8_t *sei;
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int sei_size;
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char *preset;
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char *tune;
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char *profile;
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char *level;
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int fastfirstpass;
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char *wpredp;
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char *x264opts;
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float crf;
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float crf_max;
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int cqp;
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int aq_mode;
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float aq_strength;
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char *psy_rd;
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int psy;
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int rc_lookahead;
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int weightp;
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int weightb;
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int ssim;
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int intra_refresh;
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int bluray_compat;
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int b_bias;
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int b_pyramid;
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int mixed_refs;
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int dct8x8;
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int fast_pskip;
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int aud;
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int mbtree;
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char *deblock;
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float cplxblur;
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char *partitions;
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int direct_pred;
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int slice_max_size;
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char *stats;
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int nal_hrd;
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char *x264_params;
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} X264Context;
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int main()
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{
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FILE *yuv_file = fopen("yuv_file", "ab");
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if (!yuv_file)
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return 0;
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av_register_all();
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AVFormatContext* pFormat = NULL;
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if (avformat_open_input(&pFormat, SRC_FILE, NULL, NULL) < 0)
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{
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return 0;
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}
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AVCodecContext* video_dec_ctx = NULL;
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AVCodec* video_dec = NULL;
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if (avformat_find_stream_info(pFormat, NULL) < 0)
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{
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return 0;
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}
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av_dump_format(pFormat, 0, SRC_FILE, 0);
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video_dec_ctx = pFormat->streams[0]->codec;
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video_dec = avcodec_find_decoder(video_dec_ctx->codec_id);
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if (avcodec_open2(video_dec_ctx, video_dec, NULL) < 0)
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{
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return 0;
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}
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AVFormatContext* pOFormat = NULL;
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AVOutputFormat* ofmt = NULL;
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if (avformat_alloc_output_context2(&pOFormat, NULL, NULL, OUT_FILE) < 0)
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{
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return 0;
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}
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ofmt = pOFormat->oformat;
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if (avio_open(&(pOFormat->pb), OUT_FILE, AVIO_FLAG_READ_WRITE) < 0)
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{
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return 0;
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}
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AVCodecContext *video_enc_ctx = NULL;
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AVCodec *video_enc = NULL;
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video_enc = avcodec_find_encoder(AV_CODEC_ID_H264);
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AVStream *video_st = avformat_new_stream(pOFormat, video_enc);
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if (!video_st)
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return 0;
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video_enc_ctx = video_st->codec;
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video_enc_ctx->profile = FF_PROFILE_H264_HIGH;
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video_enc_ctx->width = video_dec_ctx->width;
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video_enc_ctx->height = video_dec_ctx->height;
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video_enc_ctx->pix_fmt = PIX_FMT_YUV420P;
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video_enc_ctx->time_base.num = 1;
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video_enc_ctx->time_base.den = 25;
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video_enc_ctx->bit_rate = 400000;
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video_enc_ctx->gop_size = 250;
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video_enc_ctx->max_b_frames = 10;
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video_enc_ctx->qmin = 10;
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video_enc_ctx->qmax = 51;
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((X264Context*)(video_enc_ctx->priv_data))->preset = "superfast";
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((X264Context*)(video_enc_ctx->priv_data))->tune = "zerolatency";
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if (avcodec_open2(video_enc_ctx, video_enc, NULL) < 0)
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{
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printf("编码器打开失败!\n");
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return 0;
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}
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printf("Output264video Information====================\n");
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av_dump_format(pOFormat, 0, OUT_FILE, 1);
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printf("Output264video Information====================\n");
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avformat_write_header(pOFormat, NULL);
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AVPacket *pkt = new AVPacket();
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av_init_packet(pkt);
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AVFrame *pFrame = avcodec_alloc_frame();
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int ts = 0;
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while (1)
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{
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if (av_read_frame(pFormat, pkt) < 0)
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{
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avio_close(pOFormat->pb);
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av_write_trailer(pOFormat);
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delete pkt;
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return 0;
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}
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if (pkt->stream_index == 0)
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{
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int got_picture = 0, ret = 0;
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ret = avcodec_decode_video2(video_dec_ctx, pFrame, &got_picture, pkt);
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if (ret < 0)
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{
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delete pkt;
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return 0;
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}
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pFrame->pts = ts++;
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if (got_picture)
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{
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AVPacket *tmppkt = new AVPacket;
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av_init_packet(tmppkt);
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int size = video_enc_ctx->width*video_enc_ctx->height * 3 / 2;
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char* buf = new char[size];
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memset(buf, 0, size);
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tmppkt->data = (uint8_t*)buf;
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tmppkt->size = size;
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ret = avcodec_encode_video2(video_enc_ctx, tmppkt, pFrame, &got_picture);
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if (ret < 0)
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{
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avio_close(pOFormat->pb);
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delete buf;
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return 0;
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}
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if (got_picture)
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{
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printf(".");
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ret = av_interleaved_write_frame(pOFormat, tmppkt);
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delete tmppkt;
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delete buf;
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}
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}
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}
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}
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avcodec_free_frame(&pFrame);
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return 0;
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}
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