package main
import ( "fmt" "os" "unsafe"
"github.com/moonfdd/ffmpeg-go/ffcommon" "github.com/moonfdd/ffmpeg-go/libavcodec" "github.com/moonfdd/ffmpeg-go/libavformat" "github.com/moonfdd/ffmpeg-go/libavutil")
func main0() (ret ffcommon.FInt) { var input_ctx *libavformat.AVFormatContext var video_stream ffcommon.FInt var video *libavformat.AVStream var decoder_ctx *libavcodec.AVCodecContext var decoder *libavcodec.AVCodec var packet libavformat.AVPacket var type0 libavutil.AVHWDeviceType var i ffcommon.FInt
if len(os.Args) < 4 { fmt.Printf("Usage: %s <device type> <input file> <output file>\n", os.Args[0]) return -1 }
type0 = libavutil.AvHwdeviceFindTypeByName(os.Args[1]) if type0 == libavutil.AV_HWDEVICE_TYPE_NONE { fmt.Printf("Device type %s is not supported.\n", os.Args[1]) fmt.Printf("Available device types:") type0 = libavutil.AvHwdeviceIterateTypes(type0) for type0 != libavutil.AV_HWDEVICE_TYPE_NONE { fmt.Printf(" %s", libavutil.AvHwdeviceGetTypeName(type0)) type0 = libavutil.AvHwdeviceIterateTypes(type0) } fmt.Printf("\n") return -1 }
/* open the input file */ if libavformat.AvformatOpenInput(&input_ctx, os.Args[2], nil, nil) != 0 { fmt.Printf("Cannot open input file '%s'\n", os.Args[2]) return -1 }
if input_ctx.AvformatFindStreamInfo(nil) < 0 { fmt.Printf("Cannot find input stream information.\n") return -1 }
/* find the video stream information */ ret = input_ctx.AvFindBestStream(libavutil.AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0) if ret < 0 { fmt.Printf("Cannot find a video stream in the input file\n") return -1 } video_stream = ret
for i = 0; ; i++ { config := decoder.AvcodecGetHwConfig(i) if config == nil { fmt.Printf("Decoder %s does not support device type %s.\n", ffcommon.StringFromPtr(decoder.Name), libavutil.AvHwdeviceGetTypeName(type0)) return -1 } if config.Methods&libavcodec.AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX != 0 && config.DeviceType == type0 { hw_pix_fmt = config.PixFmt break } }
decoder_ctx = decoder.AvcodecAllocContext3() if decoder_ctx == nil { return -libavutil.ENOMEM }
video = input_ctx.GetStream(uint32(video_stream)) if decoder_ctx.AvcodecParametersToContext(video.Codecpar) < 0 { return -1 }
decoder_ctx.GetFormat = ffcommon.NewCallback(get_hw_format)
if hw_decoder_init(decoder_ctx, type0) < 0 { return -1 }
ret = decoder_ctx.AvcodecOpen2(decoder, nil) if ret < 0 { fmt.Printf("Failed to open codec for stream #%d\n", video_stream) return -1 }
/* open the file to dump raw data */ output_file, _ = os.Create(os.Args[3])
/* actual decoding and dump the raw data */ for ret >= 0 { ret = input_ctx.AvReadFrame(&packet) if ret < 0 { break }
if uint32(video_stream) == packet.StreamIndex { ret = decode_write(decoder_ctx, &packet) }
packet.AvPacketUnref() }
/* flush the decoder */ packet.Data = nil packet.Size = 0 ret = decode_write(decoder_ctx, &packet) packet.AvPacketUnref()
if output_file != nil { output_file.Close() } libavcodec.AvcodecFreeContext(&decoder_ctx) libavformat.AvformatCloseInput(&input_ctx) libavutil.AvBufferUnref(&hw_device_ctx)
return 0}
var hw_device_ctx *libavutil.AVBufferRefvar hw_pix_fmt libavutil.AVPixelFormatvar output_file *os.File
func hw_decoder_init(ctx *libavcodec.AVCodecContext, type0 libavutil.AVHWDeviceType) ffcommon.FInt { var err ffcommon.FInt = 0
err = libavutil.AvHwdeviceCtxCreate(&hw_device_ctx, type0, "", nil, 0) if err < 0 { fmt.Printf("Failed to create specified HW device.\n") return err } ctx.HwDeviceCtx = hw_device_ctx.AvBufferRef()
return err}
func get_hw_format(ctx *libavcodec.AVCodecContext, pix_fmts *libavutil.AVPixelFormat) uintptr { var p *libavutil.AVPixelFormat
for p = pix_fmts; *p != -1; p = (*libavutil.AVPixelFormat)(unsafe.Pointer(uintptr(unsafe.Pointer(p)) + uintptr(4))) { if *p == hw_pix_fmt { return uintptr(*p) } }
fmt.Printf("Failed to get HW surface format.\n") r := libavutil.AVPixelFormat(libavutil.AV_PIX_FMT_NONE) return uintptr(r)}
func decode_write(avctx *libavcodec.AVCodecContext, packet *libavcodec.AVPacket) ffcommon.FInt { var frame, sw_frame *libavutil.AVFrame var tmp_frame *libavutil.AVFrame var buffer *ffcommon.FUint8T var size ffcommon.FInt var ret ffcommon.FInt = 0 var e error
ret = avctx.AvcodecSendPacket(packet) if ret < 0 { fmt.Printf("Error during decoding\n") return ret }
for { frame = libavutil.AvFrameAlloc() sw_frame = libavutil.AvFrameAlloc() if frame == nil || sw_frame == nil { fmt.Printf("Can not alloc frame\n") ret = -libavutil.ENOMEM goto fail }
ret = avctx.AvcodecReceiveFrame(frame) if ret == -libavutil.EAGAIN || ret == libavutil.AVERROR_EOF { libavutil.AvFrameFree(&frame) libavutil.AvFrameFree(&sw_frame) return 0 } else if ret < 0 { fmt.Printf("Error while decoding\n") goto fail }
if frame.Format == hw_pix_fmt { /* retrieve data from GPU to CPU */ ret = libavutil.AvHwframeTransferData(sw_frame, frame, 0) if ret < 0 { fmt.Printf("Error transferring the data to system memory\n") goto fail } tmp_frame = sw_frame } else { tmp_frame = frame }
size = libavutil.AvImageGetBufferSize(tmp_frame.Format, tmp_frame.Width, tmp_frame.Height, 1) buffer = (*byte)(unsafe.Pointer(libavutil.AvMalloc(uint64(size)))) if buffer == nil { fmt.Printf("Can not alloc buffer\n") ret = -libavutil.ENOMEM goto fail } ret = libavutil.AvImageCopyToBuffer(buffer, size, (*[4]*byte)(unsafe.Pointer(&tmp_frame.Data)), (*[4]int32)(unsafe.Pointer(&tmp_frame.Linesize)), tmp_frame.Format, tmp_frame.Width, tmp_frame.Height, 1) if ret < 0 { fmt.Printf("Can not copy image to buffer\n") goto fail }
_, e = output_file.Write(ffcommon.ByteSliceFromByteP(buffer, int(size)))
if e != nil { fmt.Printf("Failed to dump raw data.\n") goto fail }
fail: libavutil.AvFrameFree(&frame) libavutil.AvFrameFree(&sw_frame) libavutil.AvFreep(uintptr(unsafe.Pointer(&buffer))) if ret < 0 { return ret } }}
func main() { // go run ./examples/internalexamples/hw_decode/main.go cuda ./resources/big_buck_bunny.mp4 ./out/hw.yuv // ./lib/ffplay -pixel_format yuv420p -video_size 640x360 ./out/hw.yuv
os.Setenv("Path", os.Getenv("Path")+";./lib") ffcommon.SetAvutilPath("./lib/avutil-56.dll") ffcommon.SetAvcodecPath("./lib/avcodec-58.dll") ffcommon.SetAvdevicePath("./lib/avdevice-58.dll") ffcommon.SetAvfilterPath("./lib/avfilter-56.dll") ffcommon.SetAvformatPath("./lib/avformat-58.dll") ffcommon.SetAvpostprocPath("./lib/postproc-55.dll") ffcommon.SetAvswresamplePath("./lib/swresample-3.dll") ffcommon.SetAvswscalePath("./lib/swscale-5.dll")
genDir := "./out" _, err := os.Stat(genDir) if err != nil { if os.IsNotExist(err) { os.Mkdir(genDir, 0777) // Everyone can read write and execute } }
main0()}
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