fteqw/plugins/avplug/avdecode.c

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#include "../plugin.h"
#include "../engine.h"
#include <avcodec.h>
#include <avformat.h>
#include <swscale.h>
#include <windows.h>
/*should probably try threading this*/
/*timing is based upon the start time. this means overflow issues with rtsp etc*/
struct decctx
{
unsigned int width, height;
AVFormatContext *pFormatCtx;
int videoStream;
AVCodecContext *pCodecCtx;
AVFrame *pFrame;
int64_t num, denum;
AVPicture pFrameRGB;
struct SwsContext *pScaleCtx;
unsigned int starttime;
unsigned int lastframe;
};
static qboolean AVDec_SetSize (void *vctx, int width, int height)
{
struct decctx *ctx = (struct decctx*)vctx;
AVPicture newscaled;
//colourspace conversions will be fastest if we
// if (width > ctx->pCodecCtx->width)
width = ctx->pCodecCtx->width;
// if (height > ctx->pCodecCtx->height)
height = ctx->pCodecCtx->height;
//is this a no-op?
if (width == ctx->width && height == ctx->height && ctx->pScaleCtx)
return true;
if (avpicture_alloc(&newscaled, AV_PIX_FMT_BGRA, width, height) >= 0)
{
//update the scale context as required
//clear the old stuff out
avpicture_free(&ctx->pFrameRGB);
ctx->width = width;
ctx->height = height;
ctx->pFrameRGB = newscaled;
return qtrue;
}
return qfalse; //unsupported
}
static void *AVDec_Create(char *medianame)
{
struct decctx *ctx;
unsigned int i;
AVCodec *pCodec;
/*only respond to av: media prefixes*/
if (!strncmp(medianame, "av:", 3))
medianame = medianame + 3;
else
return NULL;
ctx = malloc(sizeof(*ctx));
memset(ctx, 0, sizeof(*ctx));
//so we always decode the first frame instantly.
ctx->starttime = timeGetTime();
// Open video file
if(avformat_open_input(&ctx->pFormatCtx, medianame, NULL, NULL)==0)
{
// Retrieve stream information
if(av_find_stream_info(ctx->pFormatCtx)>=0)
{
// Find the first video stream
ctx->videoStream=-1;
for(i=0; i<ctx->pFormatCtx->nb_streams; i++)
if(ctx->pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
{
ctx->videoStream=i;
break;
}
if(ctx->videoStream!=-1)
{
// Get a pointer to the codec context for the video stream
ctx->pCodecCtx=ctx->pFormatCtx->streams[ctx->videoStream]->codec;
ctx->num = ctx->pFormatCtx->streams[ctx->videoStream]->time_base.num;
ctx->denum = ctx->pFormatCtx->streams[ctx->videoStream]->time_base.den;
// Find the decoder for the video stream
pCodec=avcodec_find_decoder(ctx->pCodecCtx->codec_id);
// Open codec
if(pCodec!=NULL && avcodec_open(ctx->pCodecCtx, pCodec) >= 0)
{
// Allocate video frame
ctx->pFrame=avcodec_alloc_frame();
if(ctx->pFrame!=NULL)
{
if (AVDec_SetSize(ctx, ctx->pCodecCtx->width, ctx->pCodecCtx->height))
{
return ctx;
}
av_free(ctx->pFrame);
}
avcodec_close(ctx->pCodecCtx);
}
}
}
av_close_input_file(ctx->pFormatCtx);
}
free(ctx);
return NULL;
}
static void *AVDec_DisplayFrame(void *vctx, qboolean nosound, enum uploadfmt_e *fmt, int *width, int *height)
{
struct decctx *ctx = (struct decctx*)vctx;
AVPacket packet;
int frameFinished;
qboolean repainted = false;
int64_t curtime, lasttime;
curtime = ((timeGetTime() - ctx->starttime) * ctx->denum);
curtime /= (ctx->num * 1000);
*fmt = TF_BGRA32;
while (1)
{
lasttime = av_frame_get_best_effort_timestamp(ctx->pFrame);
if (lasttime > curtime)
break;
// We're ahead of the previous frame. try and read the next.
if (av_read_frame(ctx->pFormatCtx, &packet) < 0)
{
*fmt = TF_INVALID;
break;
}
// Is this a packet from the video stream?
if(packet.stream_index==ctx->videoStream)
{
// Decode video frame
avcodec_decode_video2(ctx->pCodecCtx, ctx->pFrame, &frameFinished, &packet);
// Did we get a video frame?
if(frameFinished)
{
ctx->pScaleCtx = sws_getCachedContext(ctx->pScaleCtx, ctx->pCodecCtx->width, ctx->pCodecCtx->height, ctx->pCodecCtx->pix_fmt, ctx->width, ctx->height, AV_PIX_FMT_BGRA, SWS_POINT, 0, 0, 0);
// Convert the image from its native format to RGB
sws_scale(ctx->pScaleCtx, ctx->pFrame->data, ctx->pFrame->linesize, 0, ctx->pCodecCtx->height, ctx->pFrameRGB.data, ctx->pFrameRGB.linesize);
repainted = true;
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
}
*width = ctx->width;
*height = ctx->height;
if (!repainted)
return NULL;
return ctx->pFrameRGB.data[0];
}
static void AVDec_Destroy(void *vctx)
{
struct decctx *ctx = (struct decctx*)vctx;
// Free the RGB image
avpicture_free(&ctx->pFrameRGB);
// Free the YUV frame
av_free(ctx->pFrame);
// Close the codec
avcodec_close(ctx->pCodecCtx);
// Close the video file
av_close_input_file(ctx->pFormatCtx);
free(ctx);
}
static void AVDec_GetSize (void *vctx, int *width, int *height)
{
struct decctx *ctx = (struct decctx*)vctx;
*width = ctx->width;
*height = ctx->height;
}
static void AVDec_CursorMove (void *vctx, float posx, float posy)
{
//its a video, dumbass
}
static void AVDec_Key (void *vctx, int code, int unicode, int isup)
{
//its a video, dumbass
}
static void AVDec_ChangeStream(void *vctx, char *newstream)
{
}
static void AVDec_Rewind(void *ctx)
{
}
/*
//avcodec has no way to shut down properly.
static qintptr_t AVDec_Shutdown(qintptr_t *args)
{
return 0;
}
*/
static media_decoder_funcs_t decoderfuncs =
{
AVDec_Create,
AVDec_DisplayFrame,
NULL,//doneframe
AVDec_Destroy,
AVDec_Rewind,
NULL,//AVDec_CursorMove,
NULL,//AVDec_Key,
NULL,//AVDec_SetSize,
AVDec_GetSize,
NULL,//AVDec_ChangeStream
};
static qboolean AVDec_Init(void)
{
if (!Plug_ExportNative("Media_VideoDecoder", &decoderfuncs))
{
Con_Printf("avplug: Engine doesn't support media decoder plugins\n");
return false;
}
return true;
}
//get the encoder/decoders to register themselves with the engine, then make sure avformat/avcodec have registered all they have to give.
qboolean AVEnc_Init(void);
qintptr_t Plug_Init(qintptr_t *args)
{
qboolean okay = false;
okay |= AVDec_Init();
okay |= AVEnc_Init();
if (okay)
av_register_all();
return okay;
}