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| #define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <cstring>
#include <cstdio>
extern "C" {
#define __STDC_CONSTANT_MACROS
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libswscale/swscale.h>
}
class ffmpeg_decoder {
typedef bool (*draw_callback_t)( uint8_t *, int, int, int );
draw_callback_t m_draw_cb;
bool m_b_is_valid;
AVFormatContext * m_p_fmt_ctx;
AVCodecContext * m_p_dec_ctx;
int m_i_video_stream;
AVFrame * m_p_frame_yuv;
AVFrame * m_p_frame_rgb;
int m_p_frame_rgb_size;
uint8_t * m_p_frame_rgb_data;
SwsContext * m_p_sws_ctx;
public:
ffmpeg_decoder( const char * url_filename, draw_callback_t draw_cb )
: m_draw_cb( draw_cb ), m_b_is_valid( false ), m_p_fmt_ctx( nullptr ), m_p_sws_ctx( nullptr ) {
av_register_all();
if ( avformat_open_input( &m_p_fmt_ctx, url_filename, NULL, NULL ) < 0 ) {
av_log( NULL, AV_LOG_ERROR, "avformat_open_input()\n" );
} else {
if ( avformat_find_stream_info( m_p_fmt_ctx, NULL ) < 0 ) {
av_log( NULL, AV_LOG_ERROR, "avformat_find_stream_info()\n" );
} else {
AVCodec * p_codec;
m_i_video_stream = av_find_best_stream( m_p_fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &p_codec, 0 );
if ( m_i_video_stream < 0 ) {
av_log( NULL, AV_LOG_ERROR, "av_find_best_stream()\n" );
} else {
m_p_dec_ctx = m_p_fmt_ctx->streams[m_i_video_stream]->codec;
if ( avcodec_open2( m_p_dec_ctx, p_codec, NULL ) < 0 ) {
av_log( NULL, AV_LOG_ERROR, "avcodec_open2()\n" );
} else {
m_p_frame_yuv = av_frame_alloc();
m_p_frame_rgb = av_frame_alloc();
m_p_frame_rgb_size = avpicture_get_size( PIX_FMT_RGB32, m_p_dec_ctx->width, m_p_dec_ctx->height );
m_p_frame_rgb_data = new uint8_t [m_p_frame_rgb_size];
avpicture_fill( (AVPicture *)m_p_frame_rgb, m_p_frame_rgb_data, PIX_FMT_RGB32, m_p_dec_ctx->width, m_p_dec_ctx->height );
m_b_is_valid = true;
return;
}
avcodec_close( m_p_dec_ctx );
}
}
avformat_close_input( &m_p_fmt_ctx );
}
}
virtual ~ffmpeg_decoder() {
if ( is_valid() ) {
delete [] m_p_frame_rgb_data;
av_frame_free( &m_p_frame_rgb );
av_frame_free( &m_p_frame_yuv );
avcodec_close( m_p_dec_ctx );
avformat_close_input( &m_p_fmt_ctx );
}
}
bool is_valid() const {
return m_b_is_valid;
}
// returns -1 if object is not valid
int get_width() const {
return is_valid() ? m_p_dec_ctx->width : -1;
}
// returns -1 if object is not valid
int get_height() const {
return is_valid() ? m_p_dec_ctx->height : -1;
}
/// returns: 1 if video frame decoded, -1 if not video frame decoded, 0 if no more frames to decode
int decode_frame() {
int status = 1;
AVPacket packet;
if ( av_read_frame( m_p_fmt_ctx, &packet ) < 0 ) {
status = 0;
} else {
// is video frame?
if ( packet.stream_index == m_i_video_stream ) {
av_frame_unref( m_p_frame_yuv );
int got_picture = 0;
if ( avcodec_decode_video2( m_p_dec_ctx, m_p_frame_yuv, &got_picture, &packet ) < 0 ) {
status = -1;
} else {
if ( got_picture ) {
m_p_sws_ctx = sws_getCachedContext( m_p_sws_ctx,
m_p_dec_ctx->width, m_p_dec_ctx->height, m_p_dec_ctx->pix_fmt,
m_p_dec_ctx->width, m_p_dec_ctx->height, PIX_FMT_RGB32, SWS_FAST_BILINEAR, NULL, NULL, NULL );
sws_scale( m_p_sws_ctx,
m_p_frame_yuv->data, m_p_frame_yuv->linesize, 0, m_p_dec_ctx->height,
m_p_frame_rgb->data, m_p_frame_rgb->linesize );
m_draw_cb( m_p_frame_rgb->data[0], m_p_frame_rgb->linesize[0], m_p_dec_ctx->width, m_p_dec_ctx->height );
}
}
} else {
status = -1;
}
av_free_packet( &packet );
}
return status;
}
};
static HWND g_hWnd;
static BITMAPINFO g_bi;
static int g_width;
static int g_height;
static uint8_t * g_p_dib;
static int g_i_delay = 18; // ms
static bool g_pause = false;
static bool my_draw_cb( uint8_t * p_src, int /*pitch*/, int width, int height ) {
g_width = width;
g_height = height;
g_p_dib = p_src;
InvalidateRect( g_hWnd, NULL, FALSE );
return true;
}
static LRESULT CALLBACK wnd_proc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
switch ( uMsg ) {
case WM_PAINT: {
PAINTSTRUCT ps;
BeginPaint( hWnd, &ps );
SetDIBitsToDevice( ps.hdc, 0, 0, g_width, g_height, 0, 0, 0, g_height, g_p_dib, &g_bi, DIB_RGB_COLORS );
EndPaint( hWnd, &ps );
} break;
case WM_NCHITTEST:
return HTCAPTION;
case WM_KEYDOWN: {
switch ( wParam ) {
case VK_UP : --g_i_delay; if ( g_i_delay < 0 ) g_i_delay = 0; break;
case VK_DOWN : ++g_i_delay; if ( g_i_delay > 100 ) g_i_delay = 100; break;
case VK_SPACE : g_pause = !g_pause; break;
case VK_ESCAPE: PostQuitMessage( 0 ); break;
}
} break;
case WM_DESTROY: PostQuitMessage( 0 ); break;
default: return DefWindowProc( hWnd, uMsg, wParam, lParam );
}
return 0;
}
int main( int narg, char *args[] )
{
if ( narg != 2 ) return 1;
ffmpeg_decoder dec( args[1], my_draw_cb );
ZeroMemory( &g_bi, sizeof( BITMAPINFO ) );
g_bi.bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
g_bi.bmiHeader.biWidth = dec.get_width();
g_bi.bmiHeader.biHeight = -dec.get_height();
g_bi.bmiHeader.biPlanes = 1;
g_bi.bmiHeader.biBitCount = 32;
g_bi.bmiHeader.biCompression = BI_RGB;
const char * class_name = "ffmpeg_test_cls32";
HINSTANCE hInst = GetModuleHandle( NULL );
WNDCLASS wc;
ZeroMemory( &wc, sizeof( WNDCLASS ) );
wc.lpfnWndProc = wnd_proc;
wc.hInstance = hInst;
wc.lpszClassName = class_name;
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = (HBRUSH)GetStockObject( BLACK_BRUSH );
RegisterClass( &wc );
g_hWnd = CreateWindow( class_name, NULL, WS_POPUP | WS_VISIBLE,
(GetSystemMetrics( SM_CXSCREEN ) / 2) - (dec.get_width() / 2),
(GetSystemMetrics( SM_CYSCREEN ) / 2) - (dec.get_height() / 2),
dec.get_width(), dec.get_height(), NULL, NULL, hInst, NULL );
MSG msg;
for ( ; ; ) {
if ( PeekMessage( &msg, 0, 0, 0, PM_REMOVE ) ) {
TranslateMessage( &msg );
if ( msg.message == WM_QUIT ) break;
DispatchMessage( &msg );
} else {
if ( !g_pause ) {
int r = dec.decode_frame();
if ( r == 1 && g_i_delay ) Sleep( g_i_delay );
} else {
Sleep( 100 );
}
}
}
} |
