ffmpeg v1.2.1 将Yuv420p 编码成AVI源码

最近要对yuv420p的数据进行编码,看了下ffmpeg的例子,恰好它有一个例子，直接上代码；

vs2008 下的源码请到这里下载：

http://download.csdn.net/detail/smilestone322/6624047

 

// TestFFMPEG.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"

//int _tmain(int argc, _TCHAR* argv[])
//{
// return 0;
//}
//

/*
* Copyright (c) 2003 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/

/**
* @file
* libavformat API example.
*
* Output a media file in any supported libavformat format.
* The default codecs are used.
* @example doc/examples/muxing.c
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>

extern "C"
{
 #include <libavutil/mathematics.h>
 #include <libavformat/avformat.h>
 #include <libswscale/swscale.h>

 #include <libavutil/opt.h>
}

/* 5 seconds stream duration */
#define STREAM_DURATION   200.0
#define STREAM_FRAME_RATE 25 /* 25 images/s */
#define STREAM_NB_FRAMES  ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
#define STREAM_PIX_FMT    AV_PIX_FMT_YUV420P /* default pix_fmt */

static int sws_flags = SWS_BICUBIC;

/**************************************************************/
/* audio output */

static float t, tincr, tincr2;
static int16_t *samples;
static int audio_input_frame_size;

/* Add an output stream. */
static AVStream *add_stream(AVFormatContext *oc, AVCodec **codec,
       enum AVCodecID codec_id)
{
 AVCodecContext *c;
 AVStream *st;

 /* find the encoder */
 *codec = avcodec_find_encoder(codec_id);
 if (!(*codec)) {
  fprintf(stderr, "Could not find encoder for '%s'\n",
   avcodec_get_name(codec_id));
  exit(1);
 }

 st = avformat_new_stream(oc, *codec);
 if (!st) {
  fprintf(stderr, "Could not allocate stream\n");
  exit(1);
 }
 st->id = oc->nb_streams-1;
 c = st->codec;

 switch ((*codec)->type) {
 case AVMEDIA_TYPE_AUDIO:
  st->id = 1;
  c->sample_fmt  = AV_SAMPLE_FMT_S16;
  c->bit_rate    = 64000;
  c->sample_rate = 44100;
  c->channels    = 2;
  break;

 case AVMEDIA_TYPE_VIDEO:
  c->codec_id = codec_id;

  c->bit_rate = 400000;
  /* Resolution must be a multiple of two. */
  c->width    = 352;
  c->height   = 288;
  /* timebase: This is the fundamental unit of time (in seconds) in terms
  * of which frame timestamps are represented. For fixed-fps content,
  * timebase should be 1/framerate and timestamp increments should be
  * identical to 1. */
  c->time_base.den = STREAM_FRAME_RATE;
  c->time_base.num = 1;
  c->gop_size      = 12; /* emit one intra frame every twelve frames at most */
  c->pix_fmt       = STREAM_PIX_FMT;
  if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
   /* just for testing, we also add B frames */
   c->max_b_frames = 2;
  }
  if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
   /* Needed to avoid using macroblocks in which some coeffs overflow.
   * This does not happen with normal video, it just happens here as
   * the motion of the chroma plane does not match the luma plane. */
   c->mb_decision = 2;
  }

 

  //防止编码延迟修改参数
  av_opt_set(c->priv_data, "preset", "superfast", 0); 
  av_opt_set(c->priv_data, "tune", "zerolatency", 0);
  break;

 default:
  break;
 }

 /* Some formats want stream headers to be separate. */
 if (oc->oformat->flags & AVFMT_GLOBALHEADER)
  c->flags |= CODEC_FLAG_GLOBAL_HEADER;

 return st;
}

/**************************************************************/
/* audio output */

//static float t, tincr, tincr2;
//static int16_t *samples;
//static int audio_input_frame_size;

static void open_audio(AVFormatContext *oc, AVCodec *codec, AVStream *st)
{
 AVCodecContext *c;
 int ret;

 c = st->codec;

 /* open it */
 ret = avcodec_open2(c, codec, NULL);
 if (ret < 0) {
  //fprintf(stderr, "Could not open audio codec: %s\n", av_err2str(ret));

  exit(1);
 }

 /* init signal generator */
 t     = 0;
 tincr = 2 * M_PI * 110.0 / c->sample_rate;
 /* increment frequency by 110 Hz per second */
 tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;

 if (c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)
  audio_input_frame_size = 10000;
 else
  audio_input_frame_size = c->frame_size;
 samples = (int16_t *)av_malloc(audio_input_frame_size *
  av_get_bytes_per_sample(c->sample_fmt) *
  c->channels);
 if (!samples) {
  fprintf(stderr, "Could not allocate audio samples buffer\n");
  exit(1);
 }
}

/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
* 'nb_channels' channels. */
static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
{
 int j, i, v;
 int16_t *q;

 q = samples;
 for (j = 0; j < frame_size; j++) {
  v = (int)(sin(t) * 10000);
  for (i = 0; i < nb_channels; i++)
   *q++ = v;
  t     += tincr;
  tincr += tincr2;
 }
}

static void write_audio_frame(AVFormatContext *oc, AVStream *st)
{
 AVCodecContext *c;
 AVPacket pkt = { 0 }; // data and size must be 0;
 AVFrame *frame = avcodec_alloc_frame();
 int got_packet, ret;

 av_init_packet(&pkt);
 c = st->codec;

 get_audio_frame(samples, audio_input_frame_size, c->channels);
 frame->nb_samples = audio_input_frame_size;
 avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt,
  (uint8_t *)samples,
  audio_input_frame_size *
  av_get_bytes_per_sample(c->sample_fmt) *
  c->channels, 1);

 ret = avcodec_encode_audio2(c, &pkt, frame, &got_packet);
 if (ret < 0) {
  //fprintf(stderr, "Error encoding audio frame: %s\n", av_err2str(ret));
  exit(1);
 }

 if (!got_packet)
  return;

 pkt.stream_index = st->index;

 /* Write the compressed frame to the media file. */
 ret = av_interleaved_write_frame(oc, &pkt);
 if (ret != 0) {
  //fprintf(stderr, "Error while writing audio frame: %s\n",av_err2str(ret));
  exit(1);
 }
 avcodec_free_frame(&frame);
}

static void close_audio(AVFormatContext *oc, AVStream *st)
{
 avcodec_close(st->codec);

 av_free(samples);
}

/**************************************************************/
/* video output */

static AVFrame *frame;
static AVPicture src_picture, dst_picture;
static int frame_count;

static void open_video(AVFormatContext *oc, AVCodec *codec, AVStream *st)
{
 int ret;
 AVCodecContext *c = st->codec;

 /* open the codec */
 ret = avcodec_open2(c, codec, NULL);
 if (ret < 0) {
  //fprintf(stderr, "Could not open video codec: %s\n", av_err2str(ret));
  exit(1);
 }

 /* allocate and init a re-usable frame */
 frame = avcodec_alloc_frame();
 if (!frame) {
  fprintf(stderr, "Could not allocate video frame\n");
  exit(1);
 }

 /* Allocate the encoded raw picture. */
 ret = avpicture_alloc(&dst_picture, c->pix_fmt, c->width, c->height);
 if (ret < 0) {
  //fprintf(stderr, "Could not allocate picture: %s\n", av_err2str(ret));
  exit(1);
 }

 /* If the output format is not YUV420P, then a temporary YUV420P
 * picture is needed too. It is then converted to the required
 * output format. */
 if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
  ret = avpicture_alloc(&src_picture, AV_PIX_FMT_YUV420P, c->width, c->height);
  if (ret < 0) {
   //fprintf(stderr, "Could not allocate temporary picture: %s\n",av_err2str(ret));
   exit(1);
  }
 }

 /* copy data and linesize picture pointers to frame */
 *((AVPicture *)frame) = dst_picture;
}

/* Prepare a dummy image. */
static void fill_yuv_image(AVPicture *pict, int frame_index,
         int width, int height)
{
 int x, y, i;

 i = frame_index;

 /* Y */
 for (y = 0; y < height; y++)
  for (x = 0; x < width; x++)
   pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;

 /* Cb and Cr */
 for (y = 0; y < height / 2; y++) {
  for (x = 0; x < width / 2; x++) {
   pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
   pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
  }
 }
}

static void write_video_frame(AVFormatContext *oc, AVStream *st)
{
 int ret;
 static struct SwsContext *sws_ctx;
 AVCodecContext *c = st->codec;

 if (frame_count >= STREAM_NB_FRAMES) {
  /* No more frames to compress. The codec has a latency of a few
  * frames if using B-frames, so we get the last frames by
  * passing the same picture again. */
 } else {
  if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
   /* as we only generate a YUV420P picture, we must convert it
   * to the codec pixel format if needed */
   if (!sws_ctx) {
    sws_ctx = sws_getContext(c->width, c->height, AV_PIX_FMT_YUV420P,
     c->width, c->height, c->pix_fmt,
     sws_flags, NULL, NULL, NULL);
    if (!sws_ctx) {
     fprintf(stderr,
      "Could not initialize the conversion context\n");
     exit(1);
    }
   }
   fill_yuv_image(&src_picture, frame_count, c->width, c->height);
   sws_scale(sws_ctx,
    (const uint8_t * const *)src_picture.data, src_picture.linesize,
    0, c->height, dst_picture.data, dst_picture.linesize);
  } else {
   fill_yuv_image(&dst_picture, frame_count, c->width, c->height);
  }
 }

 if (oc->oformat->flags & AVFMT_RAWPICTURE) {
  /* Raw video case - directly store the picture in the packet */
  AVPacket pkt;
  av_init_packet(&pkt);

  pkt.flags        |= AV_PKT_FLAG_KEY;
  pkt.stream_index  = st->index;
  pkt.data          = dst_picture.data[0];
  pkt.size          = sizeof(AVPicture);

  ret = av_interleaved_write_frame(oc, &pkt);
 } else {
  AVPacket pkt = { 0 };
  int got_packet;
  av_init_packet(&pkt);

  /* encode the image */
  ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
  if (ret < 0) {
   //fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
   exit(1);
  }
  /* If size is zero, it means the image was buffered. */

  if (!ret && got_packet && pkt.size) {
   pkt.stream_index = st->index;

   /* Write the compressed frame to the media file. */
   ret = av_interleaved_write_frame(oc, &pkt);
  } else {
   ret = 0;
  }
 }
 if (ret != 0) {
  //fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));
  exit(1);
 }
 frame_count++;
}

static void close_video(AVFormatContext *oc, AVStream *st)
{
 avcodec_close(st->codec);
 av_free(src_picture.data[0]);
 av_free(dst_picture.data[0]);
 av_free(frame);
}

/**************************************************************/
/* media file output */

int main(int argc, char **argv)
{
 const char *filename;
 AVOutputFormat *fmt;
 AVFormatContext *oc;
 AVStream *audio_st, *video_st;
 AVCodec *audio_codec, *video_codec;
 double audio_pts, video_pts;
 int ret;

 //bool b;
 //
 //int bsize=sizeof(b);

 /* Initialize libavcodec, and register all codecs and formats. */
 av_register_all();

#if 0
 if (argc != 2) {
  printf("usage: %s output_file\n"
   "API example program to output a media file with libavformat.\n"
   "This program generates a synthetic audio and video stream, encodes and\n"
   "muxes them into a file named output_file.\n"
   "The output format is automatically guessed according to the file extension.\n"
   "Raw images can also be output by using '%%d' in the filename.\n"
   "\n", argv[0]);
  return 1;
 }
#endif

 filename = "Test.avi";

 //filename = argv[1];

 /* allocate the output media context */
 avformat_alloc_output_context2(&oc, NULL, NULL, filename);

 if (!oc) {
  printf("Could not deduce output format from file extension: using MPEG.\n");
  avformat_alloc_output_context2(&oc, NULL, "mpeg", filename);
 }
 if (!oc) {
  return 1;
 }

 oc->oformat->video_codec=AV_CODEC_ID_H264;

 fmt = oc->oformat;

 /* Add the audio and video streams using the default format codecs
 * and initialize the codecs. */
 video_st = NULL;
 audio_st = NULL;

 if (fmt->video_codec != AV_CODEC_ID_NONE) {
  video_st = add_stream(oc, &video_codec, fmt->video_codec);
 }

 if (fmt->audio_codec != AV_CODEC_ID_NONE) {
  audio_st = add_stream(oc, &audio_codec, fmt->audio_codec);
 }

 /* Now that all the parameters are set, we can open the audio and
 * video codecs and allocate the necessary encode buffers. */
 if (video_st)
 {
  open_video(oc, video_codec, video_st);
 }

 if (audio_st)
 {
  open_audio(oc, audio_codec, audio_st);
 }

 av_dump_format(oc, 0, filename, 1);

 /* open the output file, if needed */
 if (!(fmt->flags & AVFMT_NOFILE)) {
  ret = avio_open(&oc->pb, filename, AVIO_FLAG_WRITE);
  if (ret < 0) {
   //fprintf(stderr, "Could not open '%s': %s\n", filename,av_err2str(ret));
   return 1;
  }
 }

 /* Write the stream header, if any. */
 ret = avformat_write_header(oc, NULL);
 if (ret < 0) {
  //fprintf(stderr, "Error occurred when opening output file: %s\n",av_err2str(ret));
  return 1;
 }

 if (frame)
  frame->pts = 0;
 for (;;) {
  /* Compute current audio and video time. */
  if (audio_st)
  {
   audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
  }
  else
  {
   audio_pts = 0.0;
  }

  if (video_st)
  {
   video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
  }
  else
  {
   video_pts = 0.0;
  }

  if ((!audio_st || audio_pts >= STREAM_DURATION) &&
   (!video_st || video_pts >= STREAM_DURATION))
   break;

  /* write interleaved audio and video frames */
  if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
   write_audio_frame(oc, audio_st);
  } else {
   write_video_frame(oc, video_st);
   frame->pts += av_rescale_q(1, video_st->codec->time_base, video_st->time_base);
  }
 }

 /* Write the trailer, if any. The trailer must be written before you
 * close the CodecContexts open when you wrote the header; otherwise
 * av_write_trailer() may try to use memory that was freed on
 * av_codec_close(). */
 av_write_trailer(oc);

 /* Close each codec. */
 if (video_st)
 {
  close_video(oc, video_st);
 }
 if (audio_st)
 {
  close_audio(oc, audio_st);
 }

 if (!(fmt->flags & AVFMT_NOFILE))
 {
  /* Close the output file. */
  avio_close(oc->pb);
 }

 /* free the stream */
 avformat_free_context(oc);

 return 0;
}