Android使用sdl1.3播放视频的问题。
无论我怎么调视频的画面都只出现在屏幕的右边。是SDL_Surface的问题还是SDL_Overlay的问题亦或是其他的呢？求指导。jni代码：
int SDL_Play(JNIEnv *env, jclass cls)Android sdl
{
LOGI("ready to play using sdl");
AVFormatContext *pFormatCtx;
#define SDL_AUDIO_BUFFER_SIZE 1024
static int sws_flags = SWS_BICUBIC;
int i;
int videoStream = -1;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame;
AVPacket packet;
int frameFinished;
float aspect_ratio;
AVCodecContext *aCodecCtx;
SDL_Overlay *bmp;
SDL_Surface *m_screen;
SDL_Rect rect;
SDL_Event event;
av_register_all();
if(av_open_input_file(&pFormatCtx, "/mnt/sdcard/test.avi", NULL, 0, NULL)!=0)
return -1; // Couldn't open file
LOGI("open successful");
if(av_find_stream_info(pFormatCtx)<0)
return -1; // Couldn't find stream information
// Dump information about file onto standard error
dump_format(pFormatCtx, 0, "/mnt/sdcard/test.avi", 0);
// Find the first video stream
for(i=0; i<pFormatCtx->nb_streams; i++)
{
if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO && videoStream<0)
{
videoStream=i;
}
}
if(videoStream==-1)
return -1; // Didn't find a video stream
// Get a pointer to the codec context for the video stream
pCodecCtx=pFormatCtx->streams[videoStream]->codec;
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
LOGI("find decoder successful");
if(pCodec==NULL)
{
fprintf(stderr, "Unsupported codec!/n");
LOGI("Unsupported codec!/n");
return -1; // Codec not found
}
// Open codec
if(avcodec_open(pCodecCtx, pCodec)<0)
return -1; // Could not open codec
LOGI("open decoder successful");
// Allocate video frame
pFrame=avcodec_alloc_frame();
uint8_t *buffer;
int numBytes;
// Determine required buffer size and allocate buffer
numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
pCodecCtx->height);
buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
//一定要有，否则会fatal signal。 m_screen无法分配地址
SDL_Android_Init(env, cls);
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER))
{
fprintf(stderr, "Could not initialize SDL - %s/n", SDL_GetError());
LOGI("Could not initialize SDL - %s/n");
exit(1);
}
LOGI("SDL init successful");
LOGI("pCodecCtx addr:0x%x",pCodecCtx);
m_screen = SDL_SetVideoMode(/*pCodecCtx->width*/320, /*pCodecCtx->height*/480, 24, SDL_HWSURFACE | SDL_DOUBLEBUF);
LOGI("m_screen addr:0x%x",m_screen);
if(!m_screen)
{
fprintf(stderr, "SDL: could not set video mode - exiting/n");
LOGI("SDL: could not set video mode - exiting/n");
exit(1);
}
LOGI("set video mode successful");
bmp = SDL_CreateYUVOverlay(/*pCodecCtx->width*/320, /*pCodecCtx->height*/480,
SDL_YV12_OVERLAY, m_screen);
//第二个
//SDL_Overlay * overlay2 = SDL_CreateYUVOverlay(/*pCodecCtx->width*/320, /*pCodecCtx->height*/480,
// SDL_YV12_OVERLAY, m_screen);
LOGI("Create YUV Overlay successful");
static struct SwsContext *img_convert_ctx;
if (img_convert_ctx == NULL)
{
img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height,
pCodecCtx->pix_fmt,
/*pCodecCtx->width*/320, /*pCodecCtx->height*/480,
PIX_FMT_YUV420P,
sws_flags, NULL, NULL, NULL);
if (img_convert_ctx == NULL)
{
fprintf(stderr, "Cannot initialize the conversion context/n");
LOGI("Cannot initialize the conversion context/n");
exit(1);
}
}
i=0;
while(av_read_frame(pFormatCtx, &packet)>=0)
{
// Is this a packet from the video stream?
if(packet.stream_index==videoStream)
{
// Decode video frame
avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
// Did we get a video frame?
if(frameFinished)
{
// Convert the image from its native format to RGB
/*sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize,
0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);*/
// Save the frame to disk
/*if(++i<=5)
SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, i);*/
SDL_LockYUVOverlay(bmp);
//SDL_LockYUVOverlay(overlay2);
AVPicture pict;
//AVPicture pic2;
pict.data[0] = bmp->pixels[0];
pict.data[1] = bmp->pixels[2];
pict.data[2] = bmp->pixels[1];
pict.linesize[0] = bmp->pitches[0];
pict.linesize[1] = bmp->pitches[2];
pict.linesize[2] = bmp->pitches[1];
///
//pic2.data[0] = overlay2->pixels[0];
//pic2.data[1] = overlay2->pixels[2];
//pic2.data[2] = overlay2->pixels[1];
//pic2.linesize[0] = overlay2->pitches[0];
//pic2.linesize[1] = overlay2->pitches[2];
//pic2.linesize[2] = overlay2->pitches[1];
// Convert the image into YUV format that SDL uses
/*img_convert(&pict, PIX_FMT_YUV420P,
(AVPicture *)pFrame, pCodecCtx->pix_fmt,
pCodecCtx->width, pCodecCtx->height);*/
sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize,
0, pCodecCtx->height, pict.data, pict.linesize);
//第二个
// sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize,
// 0, pCodecCtx->height, pic2.data, pic2.linesize);
//SDL_UnlockYUVOverlay(overlay2);
SDL_UnlockYUVOverlay(bmp);
//第一个
rect.x = 0;
rect.y = 100;
rect.w = 320;
rect.h = 320;
//rect.w = 100;
//rect.h = 100;
//第二个
//SDL_Rect R;
//R.x = 120;
//R.y = 120;
//rect.w = pCodecCtx->width;
//rect.h = pCodecCtx->height;
//R.w = 100;
//R.h = 100;
SDL_DisplayYUVOverlay(bmp, &rect);
//SDL_DisplayYUVOverlay(overlay2, &R);
//Sleep(60);
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
SDL_PollEvent(&event);
switch(event.type)
{
case SDL_QUIT:
SDL_Quit();
exit(0);
break;
default: break;
}
};
// Free the RGB image
av_free(buffer);
//av_free(pFrameRGB);
// Free the YUV frame
av_free(pFrame);
// Close the codec
avcodec_close(pCodecCtx);
// Close the video file
av_close_input_file(pFormatCtx);
return 0;
}
