2023-10-31 09:16:44 CST W44D2

avcodec.go

@@ -3472,6 +3472,11 @@ func (avctx *AVCodecContext) GetPropertiesAddr() *uint32 {
 	return (*uint32)(&avctx.properties)
 }
 
+const (
+	FF_CODEC_PROPERTY_LOSSLESS        = uint32(C.FF_CODEC_PROPERTY_LOSSLESS)
+	FF_CODEC_PROPERTY_CLOSED_CAPTIONS = uint32(C.FF_CODEC_PROPERTY_CLOSED_CAPTIONS)
+)
+
 // GetCodedSideData gets `AVCodecContext.coded_side_data` value.
 func (avctx *AVCodecContext) GetCodedSideData() *AVPacketSideData {
 	return (*AVPacketSideData)(avctx.coded_side_data)
@@ -3730,7 +3735,7 @@ func AvCodecGetLowres(avctx *AVCodecContext) int32 {
 //
 // AvCodecSetLowres
 func AvCodecSetLowres(avctx *AVCodecContext, i int32) {
-	C.av_codec_set_lowres((*C.struct_AVCodecContext)(avctx), C.int(i))
+	C.av_codec_set_lowres((*C.struct_AVCodecContext)(avctx), (C.int)(i))
 }
 
 // Deprecated: No use.
@@ -3744,7 +3749,7 @@ func AvCodecGetSeekPreroll(avctx *AVCodecContext) int32 {
 //
 // AvCodecSetSeekPreroll
 func AvCodecSetSeekPreroll(avctx *AVCodecContext, i int32) {
-	C.av_codec_set_seek_preroll((*C.struct_AVCodecContext)(avctx), C.int(i))
+	C.av_codec_set_seek_preroll((*C.struct_AVCodecContext)(avctx), (C.int)(i))
 }
 
 // Deprecated: No use.
@@ -3905,7 +3910,9 @@ const (
 	SUBTITLE_ASS    = AVSubtitleType(C.SUBTITLE_ASS)
 )
 
-const AV_SUBTITLE_FLAG_FORCED = C.AV_SUBTITLE_FLAG_FORCED
+const (
+	AV_SUBTITLE_FLAG_FORCED = C.AV_SUBTITLE_FLAG_FORCED
+)
 
 // AVSubtitleRect
 type AVSubtitleRect C.struct_AVSubtitleRect
@@ -4290,13 +4297,13 @@ func AvSubtitleFree(s *AVSubtitle) {
 // The default callback for AVCodecContext.get_buffer2().
 func AvCodecDefaultGetBuffer2(avctx *AVCodecContext, frame *AVFrame, flags int32) int32 {
 	return (int32)(C.avcodec_default_get_buffer2((*C.struct_AVCodecContext)(avctx),
-		(*C.struct_AVFrame)(frame), C.int(flags)))
+		(*C.struct_AVFrame)(frame), (C.int)(flags)))
 }
 
 // The default callback for AVCodecContext.get_encode_buffer().
 func AvCodecDefaultGetEncodeBuffer(avctx *AVCodecContext, pkt *AVPacket, flags int32) int32 {
 	return (int32)(C.avcodec_default_get_encode_buffer((*C.struct_AVCodecContext)(avctx),
-		(*C.struct_AVPacket)(pkt), C.int(flags)))
+		(*C.struct_AVPacket)(pkt), (C.int)(flags)))
 }
 
 // AvCodecAlignDimensions modifies width and height values so that they will result in a memory
@@ -4321,7 +4328,7 @@ func AvCodecEnumToChromaPos(xpos, ypos *int32, pos AVChromaLocation) int32 {
 
 // AvCodecChromaPosToEnum converts swscale x/y chroma position to AVChromaLocation.
 func AvCodecChromaPosToEnum(xpos, ypos int32) AVChromaLocation {
-	return (AVChromaLocation)(C.avcodec_chroma_pos_to_enum(C.int(xpos), C.int(ypos)))
+	return (AVChromaLocation)(C.avcodec_chroma_pos_to_enum((C.int)(xpos), (C.int)(ypos)))
 }
 
 // Deprecated: Use AVCodecSendPacket() and AVCodecReceiveFrame().
@@ -5258,7 +5265,7 @@ func AvCodecDefaultGetFormat(avctx *AVCodecContext, fmt *AVPixelFormat) AVPixelF
 		(*C.enum_AVPixelFormat)(fmt)))
 }
 
-// Deprecated: Use  AvFourccMakeString() or AvFourcc2str() instead.
+// Deprecated: Use AvFourccMakeString() or AvFourcc2str() instead.
 //
 // AvGetCodecTagString
 func AvGetCodecTagString(buf *int8, bufSize uintptr, codecTag uint32) int32 {

avcodec_codec.go

@@ -155,12 +155,12 @@ func AvCodecFindEncoderByName(name string) *AVCodec {
 	return (*AVCodec)(C.avcodec_find_encoder_by_name((*C.char)(namePtr)))
 }
 
-// AvCodecIsEncoder returns a non-zero number if codec is an encoder, zero otherwise
+// AvCodecIsEncoder returns a non-zero number if codec is an encoder, zero otherwise.
 func AvCodecIsEncoder(codec *AVCodec) int32 {
 	return (int32)(C.av_codec_is_encoder((*C.struct_AVCodec)(codec)))
 }
 
-// AvCodecIsDecoder returns a non-zero number if codec is an decoder, zero otherwise
+// AvCodecIsDecoder returns a non-zero number if codec is an decoder, zero otherwise.
 func AvCodecIsDecoder(codec *AVCodec) int32 {
 	return (int32)(C.av_codec_is_decoder((*C.struct_AVCodec)(codec)))
 }

avcodec_mediacodec.go

@@ -25,7 +25,7 @@ func AvMediacodecDefaultInit(avctx *AVCodecContext, ctx *AVMediaCodecContext, su
 		(*C.struct_AVMediaCodecContext)(ctx), VoidPointer(surface)))
 }
 
-// AvMediacodecDefaultFree frees the MediaCodec context
+// AvMediacodecDefaultFree frees the MediaCodec context.
 func AvMediacodecDefaultFree(avctx *AVCodecContext) {
 	C.av_mediacodec_default_free((*C.struct_AVCodecContext)(avctx))
 }

avcodec_packet.go

@@ -328,7 +328,7 @@ const (
 	AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS     = AVSideDataParamChangeFlags(C.AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
 )
 
-// AvPacketAlloc allocates an AVPacket and set its fields to default values.  The resulting
+// AvPacketAlloc allocates an AVPacket and set its fields to default values. The resulting
 // struct must be freed using AVPacketFree().
 func AvPacketAlloc() *AVPacket {
 	return (*AVPacket)(C.av_packet_alloc())
@@ -358,12 +358,12 @@ func AvNewPacket(pkt *AVPacket, size int32) int32 {
 	return (int32)(C.av_new_packet((*C.struct_AVPacket)(pkt), (C.int)(size)))
 }
 
-// AvShrinkPacket reduces packet size, correctly zeroing padding
+// AvShrinkPacket reduces packet size, correctly zeroing padding.
 func AvShrinkPacket(pkt *AVPacket, size int32) {
 	C.av_shrink_packet((*C.struct_AVPacket)(pkt), (C.int)(size))
 }
 
-// AvGrowPacket increases packet size, correctly zeroing padding
+// AvGrowPacket increases packet size, correctly zeroing padding.
 func AvGrowPacket(pkt *AVPacket, growBy int32) int32 {
 	return (int32)(C.av_grow_packet((*C.struct_AVPacket)(pkt), (C.int)(growBy)))
 }
@@ -383,14 +383,14 @@ func AvDupPacket(pkt *AVPacket) {
 
 // Deprecated: Use AVPacketRef instead.
 //
-// AvCopyPacket copies packet, including contents
+// AvCopyPacket copies packet, including contents.
 func AvCopyPacket(dst, src *AVPacket) int32 {
 	return (int32)(C.av_copy_packet((*C.struct_AVPacket)(dst), (*C.struct_AVPacket)(src)))
 }
 
 // Deprecated: Use AVPacketCopyProps instead.
 //
-// AvCopyPacketSideData copies packet side data
+// AvCopyPacketSideData copies packet side data.
 func AvCopyPacketSideData(dst, src *AVPacket) int32 {
 	return (int32)(C.av_copy_packet_side_data((*C.struct_AVPacket)(dst), (*C.struct_AVPacket)(src)))
 }
@@ -457,7 +457,7 @@ func AvPacketFreeSideData(pkt *AVPacket) {
 	C.av_packet_free_side_data((*C.struct_AVPacket)(pkt))
 }
 
-// AvPacketRef setups a new reference to the data described by a given packet
+// AvPacketRef setups a new reference to the data described by a given packet.
 func AvPacketRef(dst, src *AVPacket) int32 {
 	return (int32)(C.av_packet_ref((*C.struct_AVPacket)(dst), (*C.struct_AVPacket)(src)))
 }
@@ -483,7 +483,7 @@ func AvPacketMakeRefcounted(pkt *AVPacket) {
 	C.av_packet_make_refcounted((*C.struct_AVPacket)(pkt))
 }
 
-// AvPacketMakeWritable  creates a writable reference for the data described by a given packet,
+// AvPacketMakeWritable creates a writable reference for the data described by a given packet,
 // avoiding data copy if possible.
 func AvPacketMakeWritable(pkt *AVPacket) {
 	C.av_packet_make_writable((*C.struct_AVPacket)(pkt))

avcodec_videotoolbox.go

@@ -11,6 +11,7 @@ package ffmpeg
 */
 import "C"
 
+// AVVideotoolboxContext
 type AVVideotoolboxContext C.struct_AVVideotoolboxContext
 
 // AvVideotoolboxAllocContext allocates and initializes a Videotoolbox context.

avfilter.go

@@ -180,7 +180,7 @@ func (fltc *AVFilterContext) GetName() string {
 
 // SetName sets `AVFilterContext.name` value.
 func (fltc *AVFilterContext) SetName(v string) {
-	C.free(unsafe.Pointer(fltc.name))
+	FreePointer(fltc.name)
 	fltc.name, _ = StringCasting(v)
 }
 
@@ -735,7 +735,7 @@ const (
 	AVFILTER_CMD_FLAG_FAST = C.AVFILTER_CMD_FLAG_FAST
 )
 
-// AvFilterProcessCommand  makes the filter instance process a command.
+// AvFilterProcessCommand makes the filter instance process a command.
 // It is recommended to use AVFilterGraphSendCommand().
 func AvFilterProcessCommand(filter *AVFilterContext, cmd, arg string, resLen, flags int32) (res string, ret int32) {
 	cmdPtr, cmdFunc := StringCasting(cmd)
@@ -1032,7 +1032,7 @@ func (fltio *AVFilterInOut) GetName() string {
 
 // SetName sets `AVFilterInOut.name` value.
 func (fltio *AVFilterInOut) SetName(v string) {
-	C.free(unsafe.Pointer(fltio.name))
+	FreePointer(fltio.name)
 	fltio.name, _ = StringCasting(v)
 }
 

avformat.go

@@ -982,8 +982,13 @@ func (cpt *AVChapter) GetMetadataAddr() **AVDictionary {
 	return (**AVDictionary)(unsafe.Pointer(&cpt.metadata))
 }
 
+// typedef int (*av_format_control_message)(struct AVFormatContext *s, int type,
+// void *data, size_t data_size);
 type AVFormatControlMessageFunc C.av_format_control_message
 
+// typedef int (*AVOpenCallback)(struct AVFormatContext *s,
+// AVIOContext **pb, const char *url, int flags,
+// const AVIOInterruptCB *int_cb, AVDictionary **options);
 type AVOpenCallbackFunc C.AVOpenCallback
 
 // AVDurationEstimationMethod
@@ -1140,7 +1145,7 @@ func (s *AVFormatContext) GetUrl() string {
 func (s *AVFormatContext) SetUrl(v string) {
 	vPtr, _ := StringCasting(v)
 	if s.url != nil {
-		C.free(unsafe.Pointer(s.url))
+		FreePointer(s.url)
 	}
 	s.url = (*C.char)(vPtr)
 }
@@ -2396,7 +2401,7 @@ func AvProbeInputBuffer2(pb *AVIOContext, fmt **AVInputFormat,
 		(*C.char)(urlPtr), VoidPointer(logctx), (C.uint)(offset), (C.uint)(maxProbeSize)))
 }
 
-// AvProbeInputBuffer likes AvProbeInputBuffer2() but returns 0 on success
+// AvProbeInputBuffer likes AvProbeInputBuffer2() but returns 0 on success.
 func AvProbeInputBuffer(pb *AVIOContext, fmt **AVInputFormat,
 	url string, logctx CVoidPointer, offset, maxProbeSize uint32) int32 {
 	urlPtr, urlFunc := StringCasting(url)

avutil.go

@@ -34,7 +34,7 @@ func AvutilLicense() string {
 	return C.GoString(C.avutil_license())
 }
 
-// Media Type
+// Media Type.
 type AVMediaType = C.enum_AVMediaType
 
 const (
@@ -99,6 +99,7 @@ func AvXIfNull[T any](p, x *T) *T {
 	return x
 }
 
+// AvStringIfNull
 func AvStringIfNull(p, x string) string {
 	if len(p) != 0 {
 		return p

avutil_adler32.go

@@ -9,6 +9,7 @@ package ffmpeg
 */
 import "C"
 
+// AVAdler
 type AVAdler = C.AVAdler
 
 // AvAdler32Update calculates the Adler32 checksum of a buffer.

avutil_audio_fifo.go

@@ -9,6 +9,7 @@ package ffmpeg
 */
 import "C"
 
+// AVAudioFifo
 type AVAudioFifo C.struct_AVAudioFifo
 
 // AvAudioFifoFree frees an AVAudioFifo.

avutil_avstring.go

@@ -57,6 +57,7 @@ import "C"
 
 // NONEED: av_append_path_component
 
+// AVEscapeMode
 type AVEscapeMode = C.enum_AVEscapeMode
 
 const (

avutil_blowfish.go

@@ -14,6 +14,7 @@ const (
 	AV_BF_ROUNDS = C.AV_BF_ROUNDS
 )
 
+// AVBlowfish
 type AVBlowfish C.struct_AVBlowfish
 
 // GetP gets `AVBlowfish.p` value.

avutil_bprint.go

@@ -17,6 +17,7 @@ import (
 	"unsafe"
 )
 
+// AVBPrint
 type AVBPrint C.struct_AVBPrint
 
 const (

avutil_buffer.go

@@ -47,9 +47,11 @@ func AvBufferAllocz(size int32) *AVBufferRef {
 	return (*AVBufferRef)(C.av_buffer_allocz((C.int)(size)))
 }
 
-const AV_BUFFER_FLAG_READONLY = C.AV_BUFFER_FLAG_READONLY
+const (
+	AV_BUFFER_FLAG_READONLY = C.AV_BUFFER_FLAG_READONLY
+)
 
-// typedef void (*av_buffer_free_func)(void *opaque, uint8_t *data)
+// typedef void (*av_buffer_free_func)(void *opaque, uint8_t *data);
 type AVBufferFreeFunc = C.av_buffer_free_func
 
 // AvBufferCreate Create an AVBuffer from an existing array.
@@ -108,15 +110,16 @@ func AvBufferReplace(dst **AVBufferRef, src *AVBufferRef) int32 {
 		(*C.struct_AVBufferRef)(src)))
 }
 
+// AVBufferPool
 type AVBufferPool C.struct_AVBufferPool
 
-// typedef AVBufferRef* (*av_buffer_pool_alloc_func)(int size)
+// typedef AVBufferRef* (*av_buffer_pool_alloc_func)(int size);
 type AVBufferPoolAllocFunc = C.av_buffer_pool_alloc_func
 
-// typedef AVBufferRef* (*av_buffer_pool_alloc2_func)(void* opaque, int size)
+// typedef AVBufferRef* (*av_buffer_pool_alloc2_func)(void* opaque, int size);
 type AVBufferPoolAlloc2Func = C.av_buffer_pool_alloc2_func
 
-// typedef void (*av_buffer_pool_free_func)(void* opaque)
+// typedef void (*av_buffer_pool_free_func)(void* opaque);
 type AVBufferPoolFreeFunc = C.av_buffer_pool_free_func
 
 // AvBufferPoolInit allocates and initializes a buffer pool.

avutil_camellia.go

@@ -9,6 +9,7 @@ package ffmpeg
 */
 import "C"
 
+// AVCAMELLIA
 type AVCAMELLIA C.struct_AVCAMELLIA
 
 // AvCamelliaAlloc allocates an AVCAMELLIA context.

avutil_cast5.go

@@ -9,6 +9,7 @@ package ffmpeg
 */
 import "C"
 
+// AVCAST5
 type AVCAST5 C.struct_AVCAST5
 
 // AvCast5Alloc allocates an AVCAST5 context.

avutil_channel_layout.go

@@ -77,6 +77,7 @@ const (
 	AV_CH_LAYOUT_22POINT2          = uint64(C.AV_CH_LAYOUT_22POINT2)
 )
 
+// AVMatrixEncoding
 type AVMatrixEncoding = C.enum_AVMatrixEncoding
 
 const (
@@ -105,7 +106,9 @@ func AvGetExtendedChannelLayout(name string, channelLayout *uint64, nbChannels *
 		(*C.uint64_t)(channelLayout), (*C.int32_t)(nbChannels)))
 }
 
-const AV_CH_LAYOUT_MAX_STRING_SIZE = 256
+const (
+	AV_CH_LAYOUT_MAX_STRING_SIZE = 256
+)
 
 // AvGetChannelLayoutString returns a description of a channel layout.
 func AvGetChannelLayoutString(nbChannels int32, channelLayout uint64) string {

avutil_common.go

@@ -56,6 +56,7 @@ func FFUMOD[T Integer](a, b T) T {
 	return a - b*FFUDIV(a, b)
 }
 
+// FFABS
 func FFABS[T SingedInteger](a T) T {
 	if a >= 0 {
 		return a
@@ -63,6 +64,7 @@ func FFABS[T SingedInteger](a T) T {
 	return -a
 }
 
+// FFSIGNT
 func FFSIGNT[T SingedInteger](a T) T {
 	if a > 0 {
 		return 1
@@ -105,6 +107,7 @@ func FFDIFFSIGN[T Integer](x, y T) int {
 	}
 }
 
+// FFMAX
 func FFMAX[T Integer](a, b T) T {
 	if a > b {
 		return a
@@ -112,10 +115,12 @@ func FFMAX[T Integer](a, b T) T {
 	return b
 }
 
+// FFMAX3
 func FFMAX3[T Integer](a, b, c T) T {
 	return FFMAX(FFMAX(a, b), c)
 }
 
+// FFMIN
 func FFMIN[T Integer](a, b T) T {
 	if a > b {
 		return b
@@ -123,6 +128,7 @@ func FFMIN[T Integer](a, b T) T {
 	return a
 }
 
+// FFMIN3
 func FFMIN3[T Integer](a, b, c T) T {
 	return FFMIN(FFMIN(a, b), c)
 }
@@ -241,12 +247,12 @@ func AvCeilLog2C(x int32) int32 {
 	return (int32)(C.av_ceil_log2_c((C.int)(x)))
 }
 
-// AvPopcountC counts number of bits set to one in x
+// AvPopcountC counts number of bits set to one in x.
 func AvPopcountC(x uint32) int32 {
 	return (int32)(C.av_popcount_c((C.uint)(x)))
 }
 
-// AvPopcount64C counts number of bits set to one in x
+// AvPopcount64C counts number of bits set to one in x.
 func AvPopcount64C(x uint64) int32 {
 	return (int32)(C.av_popcount64_c((C.uint64_t)(x)))
 }

avutil_cpu.go

@@ -68,7 +68,7 @@ func AvForceCpuFlags(flags int32) {
 	C.av_force_cpu_flags((C.int)(flags))
 }
 
-// Deprecated: Use AvForceCpuFlags() and AvGetCpuFlags() instead
+// Deprecated: Use AvForceCpuFlags() and AvGetCpuFlags() instead.
 //
 // AvSetCpuFlagsMask set a mask on flags returned by AvGetCpuFlags().
 func AvSetCpuFlagsMask(mask int32) {

avutil_dict.go

@@ -20,6 +20,7 @@ const (
 	AV_DICT_MULTIKEY        = C.AV_DICT_MULTIKEY
 )
 
+// AVDictionaryEntry
 type AVDictionaryEntry C.struct_AVDictionaryEntry
 
 // GetKey gets `AVDictionaryEntry.key` value.

avutil_display.go

@@ -20,10 +20,16 @@ func AvDisplayRotationGet(matrix []int32) float64 {
 // AvDisplayRotationSet initializes a transformation matrix describing a pure counterclockwise
 // rotation by the specified angle (in degrees).
 func AvDisplayRotationSet(matrix []int32, angle float64) {
+	if len(matrix) < 9 {
+		panic("matrix len < 9")
+	}
 	C.av_display_rotation_set((*C.int32_t)(&matrix[0]), (C.double)(angle))
 }
 
 // AvDisplayMatrixFlip flips the input matrix horizontally and/or vertically.
 func AvDisplayMatrixFlip(matrix []int32, hflip, vflip int32) {
+	if len(matrix) < 9 {
+		panic("matrix len < 9")
+	}
 	C.av_display_matrix_flip((*C.int32_t)(&matrix[0]), (C.int)(hflip), (C.int)(vflip))
 }

avutil_error.go

@@ -27,7 +27,7 @@ func AVUNERROR(e int32) int32 {
 	return e
 }
 
-// Error handling
+// Error handling.
 const (
 	AVERROR_BSF_NOT_FOUND      = int32(C.AVERROR_BSF_NOT_FOUND)
 	AVERROR_BUG                = int32(C.AVERROR_BUG)

avutil_file.go

@@ -29,7 +29,7 @@ func AvTempfile(prefix string, logOffset int32, logCtx CVoidPointer) (filename s
 	prefixPtr, prefixFunc := StringCasting(prefix)
 	defer prefixFunc()
 	var filenamePtr *C.char
-	defer C.free(unsafe.Pointer(filenamePtr))
+	defer FreePointer(filenamePtr)
 	ret = (int32)(C.av_tempfile((*C.char)(prefixPtr),
 		(**C.char)(unsafe.Pointer(&filenamePtr)),
 		(C.int)(logOffset),

avutil_frame.go

@@ -1363,7 +1363,7 @@ func AvFrameApplyCropping(frame *AVFrame, flags int32) int32 {
 	return (int32)(C.av_frame_apply_cropping((*C.struct_AVFrame)(frame), (C.int)(flags)))
 }
 
-// AvFrameSideDataName returns a string identifying the side data type
+// AvFrameSideDataName returns a string identifying the side data type.
 func AvFrameSideDataName(_type AVFrameSideDataType) string {
 	return C.GoString(C.av_frame_side_data_name((C.enum_AVFrameSideDataType)(_type)))
 }

avutil_hwcontext.go

@@ -31,10 +31,13 @@ const (
 	AV_HWDEVICE_TYPE_VULKAN       = AVHWDeviceType(C.AV_HWDEVICE_TYPE_VULKAN)
 )
 
+// AVHWDeviceInternal
 type AVHWDeviceInternal C.struct_AVHWDeviceInternal
 
+// AVHWDeviceContext
 type AVHWDeviceContext C.struct_AVHWDeviceContext
 
+// typedef void (*av_hw_device_context_free_func)(struct AVHWDeviceContext *ctx);
 type AVHWDeviceContextFreeFunc = C.av_hw_device_context_free_func
 
 // GetAvClass gets `AVHWDeviceContext.av_class` value.
@@ -117,10 +120,13 @@ func (dc *AVHWDeviceContext) GetUserOpaqueAddr() *unsafe.Pointer {
 	return &dc.user_opaque
 }
 
+// AVHWFramesInternal
 type AVHWFramesInternal C.struct_AVHWFramesInternal
 
+// AVHWFramesContext
 type AVHWFramesContext C.struct_AVHWFramesContext
 
+// typedef void (*av_hw_frames_context_free_func)(struct AVHWFramesContext *ctx);
 type AVHWFramesContextFreeFunc = C.av_hw_frames_context_free_func
 
 // GetAvClass gets `AVHWFramesContext.av_class` value.
@@ -393,6 +399,7 @@ func AvHWFrameTransferData(dst, src *AVFrame, flags int32) int32 {
 		(C.int)(flags)))
 }
 
+// AVHWFrameTransferDirection
 type AVHWFrameTransferDirection = C.enum_AVHWFrameTransferDirection
 
 const (
@@ -410,6 +417,7 @@ func AvHWFrameTransferGetFormats(hwframeCtx *AVBufferRef, dir AVHWFrameTransferD
 		(C.int)(flags)))
 }
 
+// AVHWFramesConstraints
 type AVHWFramesConstraints C.struct_AVHWFramesConstraints
 
 // GetValidHwFormats gets `AVHWFramesConstraints.valid_hw_formats` value.

avutil_hwcontext_qsv.go

@@ -16,3 +16,18 @@ type AVQSVDeviceContext C.struct_AVQSVDeviceContext
 
 // AVQSVFramesContext
 type AVQSVFramesContext C.struct_AVQSVFramesContext
+
+// GetFrameType gets `AVQSVFramesContext.frame_type` value.
+func (ctx *AVQSVFramesContext) GetFrameType() int32 {
+	return (int32)(ctx.frame_type)
+}
+
+// SetFrameType sets `AVQSVFramesContext.frame_type` value.
+func (ctx *AVQSVFramesContext) SetFrameType(v int32) {
+	ctx.frame_type = (C.int)(v)
+}
+
+// GetFrameTypeAddr gets `AVQSVFramesContext.frame_type` address.
+func (ctx *AVQSVFramesContext) GetFrameTypeAddr() *int32 {
+	return (*int32)(&ctx.frame_type)
+}

avutil_log.go

@@ -199,27 +199,27 @@ func AvLogOnce(avcl CVoidPointer, initialLevel, subsequentLevel int32, state *in
 
 // NONEED: av_vlog
 
-// AvLogGetLevel gets the current log level
+// AvLogGetLevel gets the current log level.
 func AvLogGetLevel() int32 {
 	return (int32)(C.av_log_get_level())
 }
 
-// AvLogSetLevel sets the log level
+// AvLogSetLevel sets the log level.
 func AvLogSetLevel(level int32) {
-	C.av_log_set_level(C.int(level))
+	C.av_log_set_level((C.int)(level))
 }
 
 // typedef void (*av_log_callback_func)(void*, int, const char*, va_list);
 type AVLogCallbackFunc = C.av_log_callback_func
 
-// AvLogSetCallback sets the logging callback
+// AvLogSetCallback sets the logging callback.
 func AvLogSetCallback(f AVLogCallbackFunc) {
 	C.av_log_set_callback(f)
 }
 
 // NONEED: av_log_default_callback
 
-// AvDefaultItemName returns the context name
+// AvDefaultItemName returns the context name.
 func AvDefaultItemName(ctx CVoidPointer) string {
 	return C.GoString(C.av_default_item_name(VoidPointer(ctx)))
 }

avutil_macros.go

@@ -9,6 +9,7 @@ package ffmpeg
 */
 import "C"
 
+// FFALIGN
 func FFALIGN[T Integer](x, a T) T {
 	return ((x) + (a) - 1) & ^((a) - 1)
 }

avutil_mathematics.go

@@ -9,6 +9,7 @@ package ffmpeg
 */
 import "C"
 
+// AVRounding
 type AVRounding = C.enum_AVRounding
 
 const (

avutil_motion_vector.go

@@ -9,6 +9,7 @@ package ffmpeg
 */
 import "C"
 
+// AVMotionVector
 type AVMotionVector C.struct_AVMotionVector
 
 // GetSource gets `AVMotionVector.source` value.

avutil_murmur3.go

@@ -9,6 +9,7 @@ package ffmpeg
 */
 import "C"
 
+// AVMurMur3
 type AVMurMur3 C.struct_AVMurMur3
 
 // AvMurmur3Alloc allocates an AVMurMur3 hash context.

avutil_pixdesc.go

@@ -10,6 +10,7 @@ package ffmpeg
 import "C"
 import "unsafe"
 
+// AVComponentDescriptor
 type AVComponentDescriptor C.struct_AVComponentDescriptor
 
 // GetPlane gets `AVComponentDescriptor.plane` value.

avutil_pixelutils.go

@@ -10,6 +10,7 @@ package ffmpeg
 */
 import "C"
 
+// AVPixelutilsSadFn
 type AVPixelutilsSadFn C.av_pixelutils_sad_fn
 
 // AvPixelutilsGetSadFn gets a potentially optimized pointer to a Sum-of-absolute-differences

avutil_rational.go

@@ -87,7 +87,7 @@ func AvD2Q(d float64, max int32) AVRational {
 // return One of the following values:
 // 1 if `q1` is nearer to `q` than `q2`
 // -1 if `q2` is nearer to `q` than `q1`
-// 0 if they have the same distance
+// 0 if they have the same distance.
 func AvNearerQ(q, q1, q2 AVRational) int32 {
 	return (int32)(C.av_nearer_q((C.struct_AVRational)(q),
 		(C.struct_AVRational)(q1), (C.struct_AVRational)(q2)))

avutil_samplefmt.go

@@ -49,7 +49,7 @@ func AvGetSampleFmt(name string) AVSampleFormat {
 // requested planar/packed format, the format returned is the same as the
 // input.
 func AvGetAltSampleFmt(sampleFmt AVSampleFormat, planar int32) AVSampleFormat {
-	return (AVSampleFormat)(C.av_get_alt_sample_fmt((C.enum_AVSampleFormat)(sampleFmt), C.int(planar)))
+	return (AVSampleFormat)(C.av_get_alt_sample_fmt((C.enum_AVSampleFormat)(sampleFmt), (C.int)(planar)))
 }
 
 // AvGetPackedSampleFmt gets the packed alternative form of the given sample format.

avutil_spherical.go

@@ -10,6 +10,7 @@ package ffmpeg
 import "C"
 import "unsafe"
 
+// AVSphericalProjection
 type AVSphericalProjection = C.enum_AVSphericalProjection
 
 const (
@@ -18,6 +19,7 @@ const (
 	AV_SPHERICAL_EQUIRECTANGULAR_TILE = AVSphericalProjection(C.AV_SPHERICAL_EQUIRECTANGULAR_TILE)
 )
 
+// AVSphericalMapping
 type AVSphericalMapping C.struct_AVSphericalMapping
 
 // GetProjection gets `AVSphericalMapping.projection` value.

avutil_stereo3d.go

@@ -36,6 +36,7 @@ const (
 	AV_STEREO3D_FLAG_INVERT = C.AV_STEREO3D_FLAG_INVERT
 )
 
+// AVStereo3D
 type AVStereo3D C.struct_AVStereo3D
 
 // GetType gets `AVStereo3D.type` value.

avutil_threadmessage.go

@@ -12,6 +12,7 @@ typedef void (*av_thread_message_free_func)(void *msg);
 import "C"
 import "unsafe"
 
+// AVThreadMessageQueue
 type AVThreadMessageQueue C.struct_AVThreadMessageQueue
 
 // AVThreadMessageFlags

avutil_timecode.go

@@ -13,6 +13,7 @@ const (
 	AV_TIMECODE_STR_SIZE = C.AV_TIMECODE_STR_SIZE
 )
 
+// AVTimecodeFlag
 type AVTimecodeFlag = C.enum_AVTimecodeFlag
 
 const (
@@ -21,6 +22,7 @@ const (
 	AV_TIMECODE_FLAG_ALLOWNEGATIVE = AVTimecodeFlag(C.AV_TIMECODE_FLAG_ALLOWNEGATIVE)
 )
 
+// AVTimecode
 type AVTimecode C.AVTimecode
 
 // GetStart gets `AVTimecode.start` value.
@@ -151,7 +153,7 @@ func AvTimecodeInitFromString(tc *AVTimecode, rate AVRational, str string, logCt
 		(*C.char)(strPtr), VoidPointer(logCtx)))
 }
 
-// AvTimecodeCheckFrameRate checks if the timecode feature is available for the given frame rate
+// AvTimecodeCheckFrameRate checks if the timecode feature is available for the given frame rate.
 func AvTimecodeCheckFrameRate(rate AVRational) int32 {
 	return (int32)(C.av_timecode_check_frame_rate((C.struct_AVRational)(rate)))
 }

avutil_tree.go

@@ -14,6 +14,7 @@ typedef int (*av_tree_enu_func)(void *opaque, void *elem);
 import "C"
 import "unsafe"
 
+// AVTreeNode
 type AVTreeNode C.struct_AVTreeNode
 
 // typedef int (*av_tree_cmp_func)(void *opaque, void *elem);

avutil_twofish.go

@@ -23,7 +23,7 @@ func AvTwofishInit(d *AVTWOFISH, key *uint8, keyBits int32) int32 {
 		(*C.uint8_t)(key), (C.int)(keyBits)))
 }
 
-// AvTwofishCrypt encrypts or decrypts a buffer using a previously initialized context
+// AvTwofishCrypt encrypts or decrypts a buffer using a previously initialized context.
 func AvTwofishCrypt(d *AVTWOFISH, dst, src *uint8, count int32, iv *uint8, decrypt int32) {
 	C.av_twofish_crypt((*C.struct_AVTWOFISH)(d),
 		(*C.uint8_t)(dst), (*C.uint8_t)(src),

avutil_xtea.go

@@ -10,6 +10,7 @@ package ffmpeg
 import "C"
 import "unsafe"
 
+// AVXTEA
 type AVXTEA C.struct_AVXTEA
 
 // GetKey gets `AVXTEA.key` value.

examples/demuxing-decoding/main.go

@@ -302,7 +302,7 @@ func main() {
 
 	if videoStream != nil {
 		fmt.Fprintf(os.Stdout, "Play the output video file with the command:\n"+
-			"ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n",
+			"ffplay -f rawvideo -pixel_format %s -video_size %dx%d %s\n",
 			ffmpeg.AvGetPixFmtName(videoDecCtx.GetPixFmt()),
 			videoDecCtx.GetWidth(), videoDecCtx.GetHeight(), videoDstFilename)
 	}

examples/muxing/main.go

@@ -401,7 +401,7 @@ func getVideoFrame(ost *outputStream) *ffmpeg.AVFrame {
 		return nil
 	}
 
-	//  when we pass a frame to the encoder, it may keep a reference to it
+	// when we pass a frame to the encoder, it may keep a reference to it
 	// internally; make sure we do not overwrite it here
 	if ffmpeg.AvFrameMakeWritable(ost.frame) < 0 {
 		panic("Make video frame writable failed")

examples/qsvdec/main.go

@@ -1,5 +1,192 @@
+//go:build ffmpeg_hw_qsv
+
 package main
 
-func main() {
+/*
+#include <stdlib.h>
 
+struct AVCodecContext;
+
+int get_format(struct AVCodecContext *avctx, int *pix_fmts) {
+	// TODO.
+	return -1;
+}
+
+*/
+import "C"
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+	"unsafe"
+
+	ffmpeg "github.com/qrtc/ffmpeg-dev-go"
+)
+
+type decodeContext struct {
+	hwDeviceRef *ffmpeg.AVBufferRef
+}
+
+func decodePacket(decode *decodeContext, decoderCtx *ffmpeg.AVCodecContext,
+	frame *ffmpeg.AVFrame, swFrame *ffmpeg.AVFrame,
+	pkt *ffmpeg.AVPacket, outputCtx *ffmpeg.AVIOContext) (ret int32) {
+	var (
+		data [][]uint8
+	)
+	if ret = ffmpeg.AvCodecSendPacket(decoderCtx, pkt); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Error during decoding\n")
+		return ret
+	}
+
+	for ret >= 0 {
+		ret = ffmpeg.AvCodecReceiveFrame(decoderCtx, frame)
+		if ret == ffmpeg.AVERROR(syscall.EAGAIN) || ret == ffmpeg.AVERROR_EOF {
+			break
+		} else if ret < 0 {
+			fmt.Fprintf(os.Stderr, "Error while decoding.\n")
+			return ret
+		}
+
+		// A real program would do something useful with the decoded frame here.
+		// We just retrieve the raw data and write it to a file, which is rather
+		// useless but pedagogic.
+		if ret = ffmpeg.AvHWFrameTransferData(swFrame, frame, 0); ret < 0 {
+			fmt.Fprintf(os.Stderr, "Error transferring the data to system memory\n")
+			goto fail
+		}
+
+		data = ffmpeg.SliceSlice(&swFrame.GetData()[0], len(swFrame.GetData()),
+			swFrame.GetWidth()*swFrame.GetHeight())
+		for i := 0; i < len(swFrame.GetData()) && data[i] != nil; i++ {
+			for j := 0; j < int(swFrame.GetHeight()>>ffmpeg.CondExpr(i > 0, 1, 0)); j++ {
+				ffmpeg.AvIOWrite(outputCtx, &data[i][j*int(swFrame.GetLinesize()[i])], swFrame.GetWidth())
+			}
+		}
+	fail:
+		ffmpeg.AvFrameUnref(swFrame)
+		ffmpeg.AvFrameUnref(frame)
+
+		if ret < 0 {
+			return ret
+		}
+	}
+
+	return 0
+}
+
+func main() {
+	var (
+		intputCtx      *ffmpeg.AVFormatContext
+		videoSt        *ffmpeg.AVStream
+		decoderCtx     *ffmpeg.AVCodecContext
+		decoder        *ffmpeg.AVCodec
+		pkt            ffmpeg.AVPacket
+		frame, swFrame *ffmpeg.AVFrame
+		decode         = &decodeContext{}
+		outputCtx      *ffmpeg.AVIOContext
+		ret            int32
+	)
+
+	if len(os.Args) < 3 {
+		fmt.Fprintf(os.Stderr, "Usage: %s <input file> <output file>\n", os.Args[0])
+		os.Exit(1)
+	}
+
+	// open the input file
+	if ret = ffmpeg.AvFormatOpenInput(&intputCtx, os.Args[1], nil, nil); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Cannot open input file '%s': ", os.Args[1])
+		goto finish
+	}
+
+	// find the first H.264 video stream
+	for i := 0; i < int(intputCtx.GetNbStreams()); i++ {
+		st := intputCtx.GetStreams()[i]
+		if st.GetCodecpar().GetCodecId() == ffmpeg.AV_CODEC_ID_H264 && videoSt == nil {
+			videoSt = st
+		} else {
+			st.SetDiscard(ffmpeg.AVDISCARD_ALL)
+		}
+	}
+	if videoSt == nil {
+		fmt.Fprintf(os.Stderr, "No H.264 video stream in the input file\n")
+		goto finish
+	}
+
+	// open the hardware device
+	if ret = ffmpeg.AvHWDeviceCtxCreate(&decode.hwDeviceRef, ffmpeg.AV_HWDEVICE_TYPE_QSV,
+		"auto", nil, 0); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Cannot open the hardware device\n")
+		goto finish
+	}
+
+	// initialize the decoder
+	if decoder = ffmpeg.AvCodecFindDecoderByName("h264_qsv"); decoder == nil {
+		fmt.Fprintf(os.Stderr, "The QSV decoder is not present in libavcodec\n")
+		goto finish
+	}
+
+	decoderCtx.SetCodecId(ffmpeg.AV_CODEC_ID_H264)
+	if videoSt.GetCodecpar().GetExtradataSize() != 0 {
+		decoderCtx.SetExtradata((*uint8)(ffmpeg.AvMallocz(videoSt.GetCodecpar().GetExtradataSize() +
+			ffmpeg.AV_INPUT_BUFFER_PADDING_SIZE)))
+		if decoderCtx.GetExtradata() == nil {
+			ret = ffmpeg.AVERROR(syscall.ENOMEM)
+			goto finish
+		}
+		copy(unsafe.Slice(decoderCtx.GetExtradata(), videoSt.GetCodecpar().GetExtradataSize()),
+			unsafe.Slice(videoSt.GetCodecpar().GetExtradata(), videoSt.GetCodecpar().GetExtradataSize()))
+	}
+
+	decoderCtx.SetOpaque(decode.hwDeviceRef)
+	decoderCtx.SetGetFormat((ffmpeg.AVCodecContextGetFormatFunc)(C.get_format))
+
+	if ret = ffmpeg.AvCodecOpen2(decoderCtx, nil, nil); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Error opening the decoder: ")
+		goto finish
+	}
+
+	// open the output stream
+	if ret = ffmpeg.AvIOOpen(&outputCtx, os.Args[2], ffmpeg.AVIO_FLAG_WRITE); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Error opening the output context: ")
+		goto finish
+	}
+
+	frame = ffmpeg.AvFrameAlloc()
+	swFrame = ffmpeg.AvFrameAlloc()
+	if frame == nil || swFrame == nil {
+		ret = ffmpeg.AVERROR(syscall.ENOMEM)
+		goto finish
+	}
+
+	// actual decoding
+	for ret >= 0 {
+		if ret = ffmpeg.AvReadFrame(intputCtx, &pkt); ret < 0 {
+			break
+		}
+
+		if pkt.GetStreamIndex() == videoSt.GetIndex() {
+			ret = decodePacket(decode, decoderCtx, frame, swFrame, &pkt, outputCtx)
+		}
+
+		ffmpeg.AvPacketUnref(&pkt)
+	}
+
+finish:
+	if ret < 0 {
+		fmt.Fprintf(os.Stderr, "%s\n", ffmpeg.AvErr2str(ret))
+	}
+
+	ffmpeg.AvFormatCloseInput(&intputCtx)
+
+	ffmpeg.AvFrameFree(&frame)
+	ffmpeg.AvFrameFree(&swFrame)
+
+	ffmpeg.AvCodecFreeContext(&decoderCtx)
+
+	ffmpeg.AvBufferUnref(&decode.hwDeviceRef)
+
+	ffmpeg.AvIOClose(outputCtx)
+
+	os.Exit(int(ret))
 }

examples/scaling-video/main.go

@@ -101,7 +101,7 @@ func main() {
 	}
 
 	fmt.Fprintf(os.Stderr, "Scaling succeeded. Play the output file with the command:\n"+
-		"ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n",
+		"ffplay -f rawvideo -pixel_format %s -video_size %dx%d %s\n",
 		ffmpeg.AvGetPixFmtName(dstPixFmt), dstW, dstH, dstFilename)
 
 end:

examples/transcode-aac/main.go

@@ -349,7 +349,7 @@ func convertSamples(inputData, convertedData **uint8,
 
 // Add converted input audio samples to the FIFO buffer for later processing.
 func addSamplesToFifo(fifo *ffmpeg.AVAudioFifo, convertedInputSamples **uint8, frameSize int32) int32 {
-	//  Make the FIFO as large as it needs to be to hold both,
+	// Make the FIFO as large as it needs to be to hold both,
 	// the old and the new samples.
 	if ret := ffmpeg.AvAudioFifoRealloc(fifo, ffmpeg.AvAudioFifoSize(fifo)+frameSize); ret < 0 {
 		fmt.Fprintf(os.Stderr, "Could not reallocate FIFO\n")

examples/transcoding/main.go

@@ -395,7 +395,7 @@ func filterEncodeWriteFrame(ofmtCtx *ffmpeg.AVFormatContext, streamCtx []streamC
 	)
 
 	ffmpeg.AvLog(nil, ffmpeg.AV_LOG_INFO, "Pushing decoded frame to filters\n")
-	//  push the decoded frame into the filtergraph
+	// push the decoded frame into the filtergraph
 	if ret = ffmpeg.AvBuffersrcAddFrameFlags(filter.buffersrcCtx, frame, 0); ret < 0 {
 		ffmpeg.AvLog(nil, ffmpeg.AV_LOG_ERROR, "Error while feeding the filtergraph\n")
 		return ret

examples/vaapi-transcode/main.go

@@ -1,5 +1,302 @@
 package main
 
-func main() {
+/*
+#include <stdlib.h>
+#include <stdio.h>
 
+struct AVCodecContext;
+
+static int av_pix_fmt_none;
+static int av_pix_fmt_vaapi;
+
+static inline void initial_pix_fmt(int x, int y)
+{
+	av_pix_fmt_none = x;
+	av_pix_fmt_vaapi = y;
+}
+
+int get_vaapi_format(struct AVCodecContext *ctx, int *pix_fmts)
+{
+    const int *p;
+
+    for (p = pix_fmts; *p != av_pix_fmt_none; p++) {
+        if (*p == av_pix_fmt_vaapi)
+            return *p;
+    }
+
+    fprintf(stderr, "Unable to decode this file using VA-API.\n");
+    return av_pix_fmt_none;
+}
+
+*/
+import "C"
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+
+	ffmpeg "github.com/qrtc/ffmpeg-dev-go"
+)
+
+type streamContext struct {
+	ifmtCtx *ffmpeg.AVFormatContext
+	ofmtCtx *ffmpeg.AVFormatContext
+
+	hwDeviceCtx *ffmpeg.AVBufferRef
+
+	decoderCtx *ffmpeg.AVCodecContext
+	encoderCtx *ffmpeg.AVCodecContext
+
+	videoStream int32
+	ost         *ffmpeg.AVStream
+	initialized bool
+}
+
+func openInputFile(filename string, sc *streamContext) (ret int32) {
+	var (
+		decoder *ffmpeg.AVCodec
+		video   *ffmpeg.AVStream
+	)
+
+	if ret = ffmpeg.AvFormatOpenInput(&sc.ifmtCtx, filename, nil, nil); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Cannot open input file '%s', Error code: %s\n",
+			filename, ffmpeg.AvErr2str(ret))
+		return ret
+	}
+
+	if ret = ffmpeg.AvFormatFindStreamInfo(sc.ifmtCtx, nil); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Cannot find input stream information. Error code: %s\n",
+			ffmpeg.AvErr2str(ret))
+		return ret
+	}
+
+	if ret = ffmpeg.AvFindBestStream(sc.ifmtCtx, ffmpeg.AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Cannot find a video stream in the input file."+
+			" Error code: %s\n", ffmpeg.AvErr2str(ret))
+		return ret
+	}
+	sc.videoStream = ret
+
+	if sc.decoderCtx = ffmpeg.AvCodecAllocContext3(decoder); sc.decoderCtx == nil {
+		return ffmpeg.AVERROR(syscall.ENOMEM)
+	}
+
+	video = sc.ifmtCtx.GetStreams()[sc.videoStream]
+	if ret = ffmpeg.AvCodecParametersToContext(sc.decoderCtx, video.GetCodecpar()); ret < 0 {
+		fmt.Fprintf(os.Stderr, "avcodec_parameters_to_context error. Error code: %s\n",
+			ffmpeg.AvErr2str(ret))
+		return ret
+	}
+
+	sc.decoderCtx.SetHwDeviceCtx(ffmpeg.AvBufferRef(sc.hwDeviceCtx))
+	if sc.decoderCtx.GetHwDeviceCtx() == nil {
+		fmt.Fprintf(os.Stderr, "A hardware device reference create failed.\n")
+		return ffmpeg.AVERROR(syscall.ENOMEM)
+	}
+	C.initial_pix_fmt((C.int)(ffmpeg.AV_PIX_FMT_NONE), (C.int)(ffmpeg.AV_PIX_FMT_VAAPI))
+	sc.decoderCtx.SetGetFormat((ffmpeg.AVCodecContextGetFormatFunc)(C.get_vaapi_format))
+
+	if ret = ffmpeg.AvCodecOpen2(sc.decoderCtx, decoder, nil); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Failed to open codec for decoding. Error code: %s\n",
+			ffmpeg.AvErr2str(ret))
+	}
+
+	return 0
+}
+
+func encodeWrite(encPkt *ffmpeg.AVPacket, frame *ffmpeg.AVFrame, sc *streamContext) (ret int32) {
+
+	ffmpeg.AvPacketUnref(encPkt)
+
+	if ret = ffmpeg.AvCodecSendFrame(sc.encoderCtx, frame); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Error during encoding. Error code: %s\n", ffmpeg.AvErr2str(ret))
+		goto end
+	}
+	for {
+		if ret = ffmpeg.AvCodecReceivePacket(sc.encoderCtx, encPkt); ret != 0 {
+			break
+		}
+
+		encPkt.SetStreamIndex(0)
+		ffmpeg.AvPacketRescaleTs(encPkt, sc.ifmtCtx.GetStreams()[sc.videoStream].GetTimeBase(),
+			sc.ofmtCtx.GetStreams()[0].GetTimeBase())
+		if ret = ffmpeg.AvInterleavedWriteFrame(sc.ofmtCtx, encPkt); ret < 0 {
+			fmt.Fprintf(os.Stderr, "Error during writing data to output file. "+
+				"Error code: %s\n", ffmpeg.AvErr2str(ret))
+			return -1
+		}
+	}
+end:
+	if ret == ffmpeg.AVERROR_EOF {
+		return 0
+	}
+	return ffmpeg.CondExpr(ret == ffmpeg.AVERROR(syscall.EAGAIN), 0, int32(-1))
+}
+
+func initialEncCodecCtx(encCodec *ffmpeg.AVCodec, sc *streamContext) (ret int32) {
+
+	// we need to ref hw_frames_ctx of decoder to initialize encoder's codec.
+	// Only after we get a decoded frame, can we obtain its hw_frames_ctx
+	sc.encoderCtx.SetHwFramesCtx(ffmpeg.AvBufferRef(sc.decoderCtx.GetHwFramesCtx()))
+	if sc.encoderCtx.GetHwFramesCtx() == nil {
+		return ffmpeg.AVERROR(syscall.ENOMEM)
+	}
+	// set AVCodecContext Parameters for encoder, here we keep them stay
+	// the same as decoder.
+	// xxx: now the sample can't handle resolution change case.
+	sc.encoderCtx.SetTimeBase(ffmpeg.AvInvQ(sc.decoderCtx.GetFramerate()))
+	sc.encoderCtx.SetPixFmt(ffmpeg.AV_PIX_FMT_VAAPI)
+	sc.encoderCtx.SetWidth(sc.decoderCtx.GetWidth())
+	sc.encoderCtx.SetHeight(sc.decoderCtx.GetHeight())
+
+	if ret = ffmpeg.AvCodecOpen2(sc.encoderCtx, encCodec, nil); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Failed to open encode codec. Error code: %s\n",
+			ffmpeg.AvErr2str(ret))
+		return ret
+	}
+	sc.ost.SetTimeBase(sc.encoderCtx.GetTimeBase())
+	if ret = ffmpeg.AvCodecParametersFromContext(sc.ost.GetCodecpar(), sc.encoderCtx); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Failed to copy the stream parameters. "+
+			"Error code: %s\n", ffmpeg.AvErr2str(ret))
+		return ret
+	}
+
+	// write the stream header
+	if ret = ffmpeg.AvFormatWriteHeader(sc.ofmtCtx, nil); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Error while writing stream header. "+
+			"Error code: %s\n", ffmpeg.AvErr2str(ret))
+		return ret
+	}
+
+	return 0
+}
+
+func decEnc(pkt *ffmpeg.AVPacket, encCodec *ffmpeg.AVCodec, sc *streamContext) (ret int32) {
+	var (
+		frame *ffmpeg.AVFrame
+	)
+
+	if ret = ffmpeg.AvCodecSendPacket(sc.decoderCtx, pkt); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Error during decoding. Error code: %s\n", ffmpeg.AvErr2str(ret))
+		return ret
+	}
+
+	for ret >= 0 {
+		if frame = ffmpeg.AvFrameAlloc(); frame == nil {
+			return ffmpeg.AVERROR(syscall.ENOMEM)
+		}
+
+		ret = ffmpeg.AvCodecReceiveFrame(sc.decoderCtx, frame)
+		if ret == ffmpeg.AVERROR(syscall.EAGAIN) || ret == ffmpeg.AVERROR_EOF {
+			ffmpeg.AvFrameFree(&frame)
+		} else if ret < 0 {
+			fmt.Fprintf(os.Stderr, "Error while decoding. Error code: %s\n", ffmpeg.AvErr2str(ret))
+			goto fail
+		}
+
+		if !sc.initialized {
+			if ret = initialEncCodecCtx(encCodec, sc); ret != 0 {
+				fmt.Fprintf(os.Stderr, "Initial EncodeCtx failed.\n")
+				goto fail
+			}
+			sc.initialized = true
+		}
+
+		if ret = encodeWrite(pkt, frame, sc); ret < 0 {
+			fmt.Fprintf(os.Stderr, "Error during encoding and writing.\n")
+		}
+	fail:
+		ffmpeg.AvFrameFree(&frame)
+		if ret < 0 {
+			return ret
+		}
+	}
+	return 0
+}
+
+func main() {
+	var (
+		ret      int32
+		decPkt   *ffmpeg.AVPacket
+		encCodec *ffmpeg.AVCodec
+		sc       = &streamContext{}
+	)
+
+	if len(os.Args) != 4 {
+		fmt.Fprintf(os.Stderr, "Usage: %s <input file> <encode codec> <output file>\n"+
+			"The output format is guessed according to the file extension.\n"+
+			"\n", os.Args[0])
+		os.Exit(1)
+	}
+
+	if ret = ffmpeg.AvHWDeviceCtxCreate(&sc.hwDeviceCtx, ffmpeg.AV_HWDEVICE_TYPE_VAAPI,
+		ffmpeg.NIL, nil, 0); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Failed to create a VAAPI device. Error code: %s\n", ffmpeg.AvErr2str(ret))
+		os.Exit(1)
+	}
+
+	if decPkt = ffmpeg.AvPacketAlloc(); decPkt == nil {
+		fmt.Fprintf(os.Stderr, "Failed to allocate decode packet\n")
+		goto end
+	}
+
+	if ret = openInputFile(os.Args[1], sc); ret < 0 {
+		goto end
+	}
+
+	if encCodec = ffmpeg.AvCodecFindEncoderByName(os.Args[2]); encCodec == nil {
+		fmt.Fprintf(os.Stderr, "Could not find encoder '%s'\n", os.Args[2])
+		ret = -1
+		goto end
+	}
+
+	if ret = ffmpeg.AvFormatAllocOutputContext2(&sc.ofmtCtx, nil, ffmpeg.NIL, os.Args[3]); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Failed to deduce output format from file extension. Error code: "+
+			"%s\n", ffmpeg.AvErr2str(ret))
+		goto end
+	}
+
+	if sc.encoderCtx = ffmpeg.AvCodecAllocContext3(encCodec); sc.encoderCtx == nil {
+		ret = ffmpeg.AVERROR(syscall.ENOMEM)
+		goto end
+	}
+
+	if ret = ffmpeg.AvIOOpen(sc.ofmtCtx.GetPbAddr(), os.Args[3], ffmpeg.AVIO_FLAG_WRITE); ret < 0 {
+		fmt.Fprintf(os.Stderr, "Cannot open output file. "+
+			"Error code: %s\n", ffmpeg.AvErr2str(ret))
+		goto end
+	}
+
+	// read all packets and only transcoding video
+	for ret >= 0 {
+		if ret = ffmpeg.AvReadFrame(sc.ifmtCtx, decPkt); ret < 0 {
+			break
+		}
+
+		if sc.videoStream == decPkt.GetStreamIndex() {
+			ret = decEnc(decPkt, encCodec, sc)
+		}
+
+		ffmpeg.AvPacketUnref(decPkt)
+	}
+
+	// flush decoder
+	ffmpeg.AvPacketUnref(decPkt)
+	decEnc(decPkt, encCodec, sc)
+
+	// flush encoder
+	encodeWrite(decPkt, nil, sc)
+
+	// write the trailer for output stream
+	ffmpeg.AvWriteTrailer(sc.ofmtCtx)
+
+end:
+	ffmpeg.AvFormatCloseInput(&sc.ifmtCtx)
+	ffmpeg.AvFormatCloseInput(&sc.ofmtCtx)
+	ffmpeg.AvCodecFreeContext(&sc.decoderCtx)
+	ffmpeg.AvCodecFreeContext(&sc.encoderCtx)
+	ffmpeg.AvBufferUnref(&sc.hwDeviceCtx)
+	ffmpeg.AvPacketFree(&decPkt)
+	os.Exit(int(ret))
 }

ffmpeg_helper.go

@@ -25,6 +25,33 @@ type UnsingedInteger interface {
 	~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr
 }
 
+// CVoidPointer represents a (void*) type pointer in the C world.
+type CVoidPointer any
+
+// VoidPointer returns a unsafe.Pointer from CVoidPointer.
+func VoidPointer(a CVoidPointer) unsafe.Pointer {
+	if a == nil {
+		return nil
+	}
+	return unsafe.Pointer(reflect.ValueOf(a).Pointer())
+}
+
+// CVoidPointer represents a (void**) type pointer in the C world.
+type CVoidPointerPointer any
+
+// VoidPointerPointer returns a *unsafe.Pointer from CVoidPointerPointer.
+func VoidPointerPointer(a CVoidPointerPointer) *unsafe.Pointer {
+	if a == nil {
+		return nil
+	}
+	return (*unsafe.Pointer)(unsafe.Pointer(reflect.ValueOf(a).Pointer()))
+}
+
+// FreePointer frees memory allocated in the C world.
+func FreePointer(ptr CVoidPointer) {
+	C.free(VoidPointer(ptr))
+}
+
 const NIL = "\\'<nil>'\\"
 
 // StringCasting casts go string to c world char* with free function.
@@ -34,7 +61,7 @@ func StringCasting(s string) (allocPtr *C.char, freeFunc func()) {
 		return nil, func() {}
 	}
 	allocPtr = C.CString(s)
-	freeFunc = func() { C.free(unsafe.Pointer(allocPtr)) }
+	freeFunc = func() { FreePointer(allocPtr) }
 	return allocPtr, freeFunc
 }
 
@@ -96,28 +123,6 @@ func PointerOffset[U any, V Integer](ptr *U, offset V) *U {
 		uintptr(unsafe.Sizeof(*ptr))*(uintptr(offset))))
 }
 
-// CVoidPointer represents a (void*) type pointer in the C world.
-type CVoidPointer any
-
-// VoidPointer returns a unsafe.Pointer from CVoidPointer.
-func VoidPointer(a CVoidPointer) unsafe.Pointer {
-	if a == nil {
-		return nil
-	}
-	return unsafe.Pointer(reflect.ValueOf(a).Pointer())
-}
-
-// CVoidPointer represents a (void**) type pointer in the C world.
-type CVoidPointerPointer any
-
-// VoidPointerPointer returns a *unsafe.Pointer from CVoidPointerPointer.
-func VoidPointerPointer(a CVoidPointerPointer) *unsafe.Pointer {
-	if a == nil {
-		return nil
-	}
-	return (*unsafe.Pointer)(unsafe.Pointer(reflect.ValueOf(a).Pointer()))
-}
-
 // CondExpr is Conditional Operator like Ternary Operator in the C world.
 func CondExpr[T any](cond bool, x, y T) T {
 	if cond {
@@ -126,6 +131,7 @@ func CondExpr[T any](cond bool, x, y T) T {
 	return y
 }
 
+// PlusPlus is ++ like operator.
 func PlusPlus[T Integer](x *T) T {
 	defer func() { *x++ }()
 	return *x

swresample.go

@@ -14,7 +14,7 @@ const (
 	SWR_FLAG_RESAMPLE = C.SWR_FLAG_RESAMPLE
 )
 
-// Dithering algorithms
+// Dithering algorithms.
 type SwrDitherType = C.enum_SwrDitherType
 
 const (
@@ -33,7 +33,7 @@ const (
 	SWR_DITHER_NB                     = SwrDitherType(C.SWR_DITHER_NB)
 )
 
-// Resampling Engines
+// Resampling Engines.
 type SwrEngine = C.enum_SwrEngine
 
 const (
@@ -42,7 +42,7 @@ const (
 	SWR_ENGINE_NB   = SwrEngine(C.SWR_ENGINE_NB)
 )
 
-// Resampling Filter Types
+// Resampling Filter Types.
 type SwrFilterType = C.enum_SwrFilterType
 
 const (
@@ -109,7 +109,7 @@ func SwrNextPts(s *SwrContext, pts int64) int64 {
 	return (int64)(C.swr_next_pts((*C.struct_SwrContext)(s), (C.int64_t)(pts)))
 }
 
-// SwrSetCompensation  activates resampling compensation ("soft" compensation).
+// SwrSetCompensation activates resampling compensation ("soft" compensation).
 // This function is internally called when needed in SwrNextPts().
 func SwrSetCompensation(s *SwrContext, sampleDelta, compensationDistance int32) int32 {
 	return (int32)(C.swr_set_compensation((*C.struct_SwrContext)(s),