vc调用ffmpeg进行x264视频编码

/* * copyright (c) 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file apiexample.c * avcodec API use example. * * Note that this library only handles codecs (mpeg, mpeg4, etc...), * not file formats (avi, vob, etc...). See library 'libavformat' for the * format handling */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <math.h> #ifdef HAVE_AV_CONFIG_H #undef HAVE_AV_CONFIG_H #endif #include "avcodec.h" #define INBUF_SIZE 4096 /* * Audio encoding example */ // void audio_encode_example(const char *filename) // { // AVCodec *codec; // AVCodecContext *c= NULL; // int frame_size, i, j, out_size, outbuf_size; // FILE *f; // short *samples; // float t, tincr; // uint8_t *outbuf; // // printf("Audio encoding\n"); // // /* find the MP2 encoder */ // codec = avcodec_find_encoder(CODEC_ID_MP2); // if (!codec) { // fprintf(stderr, "codec not found\n"); // exit(1); // } // // c= avcodec_alloc_context(); // // /* put sample parameters */ // c->bit_rate = 64000; // c->sample_rate = 44100; // c->channels = 2; // // /* open it */ // if (avcodec_open(c, codec) < 0) { // fprintf(stderr, "could not open codec\n"); // exit(1); // } // // /* the codec gives us the frame size, in samples */ // frame_size = c->frame_size; // samples = malloc(frame_size * 2 * c->channels); // outbuf_size = 10000; // outbuf = malloc(outbuf_size); // // f = fopen(filename, "wb"); // if (!f) { // fprintf(stderr, "could not open %s\n", filename); // exit(1); // } // // /* encode a single tone sound */ // t = 0; // tincr = 2 * M_PI * 440.0 / c->sample_rate; // for(i=0;i<200;i++) { // for(j=0;j<frame_size;j++) { // samples[2*j] = (int)(sin(t) * 10000); // samples[2*j+1] = samples[2*j]; // t += tincr; // } // /* encode the samples */ // out_size = avcodec_encode_audio(c, outbuf, outbuf_size, samples); // fwrite(outbuf, 1, out_size, f); // } // fclose(f); // free(outbuf); // free(samples); // // avcodec_close(c); // av_free(c); // } /* * Audio decoding. */ void audio_decode_example(const char *outfilename, const char *filename) { AVCodec *codec; AVCodecContext *c= NULL; int out_size, size, len; FILE *f, *outfile; uint8_t *outbuf; uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE], *inbuf_ptr; printf("Audio decoding\n"); /* set end of buffer to 0 (this ensures that no overreading happens for damaged mpeg streams) */ memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE); /* find the mpeg audio decoder */ codec = avcodec_find_decoder(CODEC_ID_MP2); if (!codec) { fprintf(stderr, "codec not found\n"); exit(1); } c= avcodec_alloc_context(); /* open it */ if (avcodec_open(c, codec) < 0) { fprintf(stderr, "could not open codec\n"); exit(1); } outbuf = malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE); f = fopen(filename, "rb"); if (!f) { fprintf(stderr, "could not open %s\n", filename); exit(1); } outfile = fopen(outfilename, "wb"); if (!outfile) { av_free(c); exit(1); } /* decode until eof */ inbuf_ptr = inbuf; for(;;) { size = fread(inbuf, 1, INBUF_SIZE, f); if (size == 0) break; inbuf_ptr = inbuf; while (size > 0) { len = avcodec_decode_audio(c, (short *)outbuf, &out_size, inbuf_ptr, size); if (len < 0) { fprintf(stderr, "Error while decoding\n"); exit(1); } if (out_size > 0) { /* if a frame has been decoded, output it */ fwrite(outbuf, 1, out_size, outfile); } size -= len; inbuf_ptr += len; } } fclose(outfile); fclose(f); free(outbuf); avcodec_close(c); av_free(c); } static void read_yuv_fromfile(AVFrame *picture, int width, int height, FILE *f) { int luma_size; int chroma_size; luma_size = width*height; chroma_size= luma_size>>2; fread(picture->data[0], 1, luma_size, f); fread(picture->data[1], 1, chroma_size, f); fread(picture->data[2], 1, chroma_size, f); } /* * Video encoding example */ void video_encode_example(const char *filename, const char *YUVfile) { AVCodec *codec; AVCodecContext *c= NULL; int i, out_size, size, x, y, outbuf_size; FILE *f; FILE *fpYUV; AVFrame *picture; uint8_t *outbuf, *picture_buf; printf("Video encoding\n"); /* find the mpeg1 video encoder */ codec = avcodec_find_encoder(CODEC_ID_H264); if (!codec) { fprintf(stderr, "codec not found\n"); exit(1); } c= avcodec_alloc_context(); picture= avcodec_alloc_frame(); /* put sample parameters */ c->bit_rate = 400000; /* resolution must be a multiple of two */ c->width = 352; c->height = 288; /* frames per second */ c->time_base.num = 1; c->time_base.den = 25; c->gop_size = 10; /* emit one intra frame every ten frames */ c->max_b_frames=1; c->pix_fmt = PIX_FMT_YUV420P; /* open it */ if (avcodec_open(c, codec) < 0) { fprintf(stderr, "could not open codec\n"); exit(1); } /* the codec gives us the frame size, in samples */ f = fopen(filename, "wb"); if (!f) { fprintf(stderr, "could not open %s\n", filename); exit(1); } /* alloc image and output buffer */ outbuf_size = 100000; outbuf = malloc(outbuf_size); size = c->width * c->height; picture_buf = malloc((size * 3) / 2); /* size for YUV 420 */ picture->data[0] = picture_buf; picture->data[1] = picture->data[0] + size; picture->data[2] = picture->data[1] + size / 4; picture->linesize[0] = c->width; picture->linesize[1] = c->width / 2; picture->linesize[2] = c->width / 2; fpYUV = fopen(YUVfile, "rb"); if (!fpYUV) { fprintf(stderr, "could not open %s\n", filename); exit(1); } /* encode 1 second of video */ for(i=0;i<300;i++) { fflush(stdout); // /* prepare a dummy image */ // /* Y */ // for(y=0;y<c->height;y++) { // for(x=0;x<c->width;x++) { // picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3; // } // } // // /* Cb and Cr */ // for(y=0;y<c->height/2;y++) { // for(x=0;x<c->width/2;x++) { // picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2; // picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5; // } // } read_yuv_fromfile(picture