fteqw/plugins/avplug/avdecode.c

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#include "../plugin.h"
#include "../engine.h"
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
//between av 52.31 and 54.35, lots of constants etc got renamed to gain an extra AV_ prefix.
/*
#define AV_PIX_FMT_BGRA PIX_FMT_BGRA
#define AVMEDIA_TYPE_AUDIO CODEC_TYPE_AUDIO
#define AVMEDIA_TYPE_VIDEO CODEC_TYPE_VIDEO
#define AV_PIX_FMT_BGRA PIX_FMT_BGRA
#define AV_SAMPLE_FMT_U8 SAMPLE_FMT_U8
#define AV_SAMPLE_FMT_S16 SAMPLE_FMT_S16
#define AV_SAMPLE_FMT_FLT SAMPLE_FMT_FLT
#define AVIOContext ByteIOContext
#define avio_alloc_context av_alloc_put_byte
*/
#define PASSFLOAT(f) *(int*)&(f)
#define ARGNAMES ,sourceid, data, speed, samples, channels, width, PASSFLOAT(volume)
BUILTIN(void, S_RawAudio, (int sourceid, void *data, int speed, int samples, int channels, int width, float volume));
#undef ARGNAMES
/*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;
qhandle_t file;
int64_t fileofs;
int64_t filelen;
AVFormatContext *pFormatCtx;
int audioStream;
AVCodecContext *pACodecCtx;
AVFrame *pAFrame;
int videoStream;
AVCodecContext *pVCodecCtx;
AVFrame *pVFrame;
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->pVCodecCtx->width;
// if (height > ctx->pCodecCtx->height)
height = ctx->pVCodecCtx->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 int AVIO_Read(void *opaque, uint8_t *buf, int buf_size)
{
struct decctx *ctx = opaque;
int ammount;
ammount = pFS_Read(ctx->file, buf, buf_size);
if (ammount > 0)
ctx->fileofs += ammount;
return ammount;
}
static int64_t AVIO_Seek(void *opaque, int64_t offset, int whence)
{
struct decctx *ctx = opaque;
int64_t ret = ctx->fileofs;
switch(whence)
{
case SEEK_SET:
default:
ctx->fileofs = offset;
break;
case SEEK_CUR:
ctx->fileofs += offset;
break;
case SEEK_END:
ctx->fileofs = ctx->filelen + offset;
break;
case AVSEEK_SIZE:
return ctx->filelen;
}
pFS_Seek(ctx->file, ctx->fileofs & 0xffffffff, ctx->fileofs>>32);
return ret;
}
static void AVDec_Destroy(void *vctx)
{
struct decctx *ctx = (struct decctx*)vctx;
// Free the video stuff
avpicture_free(&ctx->pFrameRGB);
av_free(ctx->pVFrame);
avcodec_close(ctx->pVCodecCtx);
// Free the audio decoder
av_free(ctx->pAFrame);
avcodec_close(ctx->pACodecCtx);
// Close the video file
avformat_close_input(&ctx->pFormatCtx);
if (ctx->file >= 0)
pFS_Close(ctx->file);
free(ctx);
}
static void *AVDec_Create(char *medianame)
{
struct decctx *ctx;
unsigned int i;
AVCodec *pCodec;
qboolean useioctx = false;
/*only respond to av: media prefixes*/
if (!strncmp(medianame, "av:", 3))
{
medianame = medianame + 3;
useioctx = true;
}
else if (!strncmp(medianame, "avs:", 4))
{
medianame = medianame + 4;
//let avformat do its own avio context stuff
}
else
return NULL;
ctx = malloc(sizeof(*ctx));
memset(ctx, 0, sizeof(*ctx));
//so we always decode the first frame instantly.
ctx->starttime = pSys_Milliseconds();
ctx->file = -1;
if (useioctx)
{
// Create internal Buffer for FFmpeg:
const int iBufSize = 32 * 1024;
char *pBuffer = malloc(iBufSize);
AVIOContext *ioctx;
ctx->filelen = pFS_Open(medianame, &ctx->file, 1);
if (ctx->filelen < 0)
{
Con_Printf("Unable to open %s\n", medianame);
free(ctx);
free(pBuffer);
return NULL;
}
ioctx = avio_alloc_context(pBuffer, iBufSize, 0, ctx, AVIO_Read, 0, AVIO_Seek);
ctx->pFormatCtx = avformat_alloc_context();
ctx->pFormatCtx->pb = ioctx;
}
// Open video file
if(avformat_open_input(&ctx->pFormatCtx, medianame, NULL, NULL)==0)
{
// Retrieve stream information
if(avformat_find_stream_info(ctx->pFormatCtx, NULL)>=0)
{
ctx->audioStream=-1;
for(i=0; i<ctx->pFormatCtx->nb_streams; i++)
if(ctx->pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO)
{
ctx->audioStream=i;
break;
}
if(ctx->audioStream!=-1)
{
ctx->pACodecCtx=ctx->pFormatCtx->streams[ctx->audioStream]->codec;
pCodec=avcodec_find_decoder(ctx->pACodecCtx->codec_id);
ctx->pAFrame=avcodec_alloc_frame();
if(pCodec!=NULL && ctx->pAFrame && avcodec_open2(ctx->pACodecCtx, pCodec, NULL) >= 0)
{
}
else
ctx->audioStream = -1;
}
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->pVCodecCtx=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->pVCodecCtx->codec_id);
// Open codec
if(pCodec!=NULL && avcodec_open2(ctx->pVCodecCtx, pCodec, NULL) >= 0)
{
// Allocate video frame
ctx->pVFrame=avcodec_alloc_frame();
if(ctx->pVFrame!=NULL)
{
if (AVDec_SetSize(ctx, ctx->pVCodecCtx->width, ctx->pVCodecCtx->height))
{
return ctx;
}
}
}
}
}
}
AVDec_Destroy(ctx);
return NULL;
}
static void *AVDec_DisplayFrame(void *vctx, qboolean nosound, uploadfmt_t *fmt, int *width, int *height)
{
struct decctx *ctx = (struct decctx*)vctx;
AVPacket packet;
int frameFinished;
qboolean repainted = false;
int64_t curtime, lasttime;
curtime = ((pSys_Milliseconds() - ctx->starttime) * ctx->denum);
curtime /= (ctx->num * 1000);
*fmt = TF_BGRA32;
while (1)
{
lasttime = av_frame_get_best_effort_timestamp(ctx->pVFrame);
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->pVCodecCtx, ctx->pVFrame, &frameFinished, &packet);
// Did we get a video frame?
if(frameFinished)
{
ctx->pScaleCtx = sws_getCachedContext(ctx->pScaleCtx, ctx->pVCodecCtx->width, ctx->pVCodecCtx->height, ctx->pVCodecCtx->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, (void*)ctx->pVFrame->data, ctx->pVFrame->linesize, 0, ctx->pVCodecCtx->height, ctx->pFrameRGB.data, ctx->pFrameRGB.linesize);
repainted = true;
}
}
else if(packet.stream_index==ctx->audioStream && !nosound)
{
int okay;
int len;
void *odata = packet.data;
while (packet.size > 0)
{
okay = false;
len = avcodec_decode_audio4(ctx->pACodecCtx, ctx->pAFrame, &okay, &packet);
if (len < 0)
break;
packet.size -= len;
packet.data += len;
if (okay)
{
int width = 2;
unsigned int auddatasize = av_samples_get_buffer_size(NULL, ctx->pACodecCtx->channels, ctx->pAFrame->nb_samples, ctx->pACodecCtx->sample_fmt, 1);
void *auddata = ctx->pAFrame->data[0];
switch(ctx->pACodecCtx->sample_fmt)
{
default:
auddatasize = 0;
break;
case AV_SAMPLE_FMT_U8:
width = 1;
break;
case AV_SAMPLE_FMT_S16:
width = 2;
break;
case AV_SAMPLE_FMT_FLT:
{
float *in = (void*)auddata;
signed short *out = (void*)auddata;
unsigned int i;
for (i = 0; i < auddatasize/sizeof(*in); i++)
{
out[i] = (short)(in[i]*32767);
}
auddatasize/=2;
width = 2;
}
break;
}
pS_RawAudio(-1, auddata, ctx->pACodecCtx->sample_rate, auddatasize/(ctx->pACodecCtx->channels*width), ctx->pACodecCtx->channels, width, 1);
}
}
packet.data = odata;
}
// 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_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 *vctx)
{
struct decctx *ctx = (struct decctx*)vctx;
if (ctx->videoStream >= 0)
av_seek_frame(ctx->pFormatCtx, ctx->videoStream, 0, AVSEEK_FLAG_BACKWARD);
if (ctx->audioStream >= 0)
av_seek_frame(ctx->pFormatCtx, ctx->audioStream, 0, AVSEEK_FLAG_BACKWARD);
ctx->starttime = pSys_Milliseconds();
}
/*
//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 (!pPlug_ExportNative("Media_VideoDecoder", &decoderfuncs))
{
Con_Printf("avplug: Engine doesn't support media decoder plugins\n");
return false;
}
CHECKBUILTIN(S_RawAudio);
CHECKBUILTIN(FS_Seek);
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;
}