utils.c File Reference

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Classes

struct InternalBuffer

struct VideoFrameSizeAbbr

struct VideoFrameRateAbbr

Functions

void * av_fast_realloc (void *ptr, unsigned int *size, unsigned int min_size)

Reallocates the given block if it is not large enough, otherwise it does nothing.

void * av_mallocz_static (unsigned int size)

Allocation of static arrays.

void * ff_realloc_static (void *ptr, unsigned int size)

Same as av_mallocz_static(), but does a realloc.

void av_free_static (void)

Frees all static arrays and resets their pointers to 0.

static void do_free (void)

Call av_free_static automatically before it's too late.

void register_avcodec (AVCodec *format)

void avcodec_set_dimensions (AVCodecContext *s, int width, int height)

void avcodec_align_dimensions (AVCodecContext *s, int *width, int *height)

int avcodec_check_dimensions (void *av_log_ctx, unsigned int w, unsigned int h)

Checks if the given dimension of a picture is valid, meaning that all bytes of the picture can be addressed with a signed int.

int avcodec_default_get_buffer (AVCodecContext *s, AVFrame *pic)

void avcodec_default_release_buffer (AVCodecContext *s, AVFrame *pic)

int avcodec_default_reget_buffer (AVCodecContext *s, AVFrame *pic)

int avcodec_default_execute (AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void **arg, int *ret, int count)

enum PixelFormat avcodec_default_get_format (struct AVCodecContext *s, const enum PixelFormat *fmt)

void avcodec_default_decode_cc_dvd (AVCodecContext *c, const uint8_t *buf, int buf_size)

static const char * context_to_name (void *ptr)

void avcodec_get_context_defaults2 (AVCodecContext *s, enum CodecType codec_type)

THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! we WILL change its arguments and name a few times!

AVCodecContext * avcodec_alloc_context2 (enum CodecType codec_type)

THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! we WILL change its arguments and name a few times!

void avcodec_get_context_defaults (AVCodecContext *s)

Sets the fields of the given AVCodecContext to default values.

AVCodecContext * avcodec_alloc_context (void)

Allocates an AVCodecContext and sets its fields to default values.

void avcodec_get_frame_defaults (AVFrame *pic)

Sets the fields of the given AVFrame to default values.

AVFrame * avcodec_alloc_frame (void)

Allocates an AVFrame and sets its fields to default values.

int attribute_align_arg avcodec_open (AVCodecContext *avctx, AVCodec *codec)

Initializes the AVCodecContext to use the given AVCodec.

int attribute_align_arg avcodec_encode_audio (AVCodecContext *avctx, uint8_t *buf, int buf_size, const short *samples)

Encodes an audio frame from samples into buf.

int attribute_align_arg avcodec_encode_video (AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVFrame *pict)

Encodes a video frame from pict into buf.

int avcodec_encode_subtitle (AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub)

int attribute_align_arg avcodec_decode_video (AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, uint8_t *buf, int buf_size)

Decodes a video frame from buf into picture.

int attribute_align_arg avcodec_decode_audio2 (AVCodecContext *avctx, int16_t *samples, int *frame_size_ptr, uint8_t *buf, int buf_size)

Decodes an audio frame from buf into samples.

int avcodec_decode_audio (AVCodecContext *avctx, int16_t *samples, int *frame_size_ptr, uint8_t *buf, int buf_size)

int avcodec_decode_subtitle (AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, const uint8_t *buf, int buf_size)

int avcodec_close (AVCodecContext *avctx)

AVCodec * avcodec_find_encoder (enum CodecID id)

Finds a registered encoder with a matching codec ID.

AVCodec * avcodec_find_encoder_by_name (const char *name)

Finds a registered encoder with the specified name.

AVCodec * avcodec_find_decoder (enum CodecID id)

Finds a registered decoder with a matching codec ID.

AVCodec * avcodec_find_decoder_by_name (const char *name)

Finds a registered decoder with the specified name.

void avcodec_string (char *buf, int buf_size, AVCodecContext *enc, int encode)

unsigned avcodec_version (void)

unsigned avcodec_build (void)

static void init_crcs (void)

void avcodec_init (void)

Initializes libavcodec.

void avcodec_flush_buffers (AVCodecContext *avctx)

Flush buffers, should be called when seeking or when switching to a different stream.

void avcodec_default_free_buffers (AVCodecContext *s)

char av_get_pict_type_char (int pict_type)

Returns a single letter to describe the given picture type pict_type.

int av_get_bits_per_sample (enum CodecID codec_id)

Returns codec bits per sample.

int av_get_bits_per_sample_format (enum SampleFormat sample_fmt)

Returns sample format bits per sample.

int avcodec_thread_init (AVCodecContext *s, int thread_count)

unsigned int av_xiphlacing (unsigned char *s, unsigned int v)

int av_tempfile (char *prefix, char **filename)

int av_parse_video_frame_size (int *width_ptr, int *height_ptr, const char *str)

Parses str and put in width_ptr and height_ptr the detected values.

int av_parse_video_frame_rate (AVRational *frame_rate, const char *arg)

Parses str and put in frame_rate the detected values.

Variables

const uint8_t ff_reverse [256]

static int volatile entangled_thread_counter = 0

static unsigned int last_static = 0

static unsigned int allocated_static = 0

static void ** array_static = NULL

AVCodec * first_avcodec = NULL

static const AVOption options []

static AVClass av_codec_context_class = { "AVCodecContext", context_to_name, options }

static VideoFrameSizeAbbr video_frame_size_abbrs []

static VideoFrameRateAbbr video_frame_rate_abbrs []

Function Documentation

void* av_fast_realloc	(	void *	ptr,
		unsigned int *	size,
		unsigned int	min_size
	)

Reallocates the given block if it is not large enough, otherwise it does nothing.

See also:: av_realloc

Definition at line 62 of file libavcodec/utils.c.

Referenced by allocate_buffers(), av_add_index_entry(), av_mallocz_static(), avcodec_default_get_buffer(), decode_frame(), decode_i_frame(), decode_nal(), decode_p_frame(), ff_combine_frame(), ff_h263_decode_frame(), flac_decode_frame(), read_frame(), and shorten_decode_frame().

void* av_mallocz_static ( unsigned int size )

Allocation of static arrays.

Warning:: Do not use for normal allocation.

Parameters:

[in] size The amount of memory you need in bytes.

Returns:: block of memory of the requested size

Deprecated:: . Code which uses av_mallocz_static is broken/misdesigned and should correctly use static arrays

Definition at line 76 of file libavcodec/utils.c.

Referenced by ff_realloc_static(), init_2d_vlc_rl(), init_crcs(), and init_vlc_rl().

void* ff_realloc_static	(	void *	ptr,
		unsigned int	size
	)

Same as av_mallocz_static(), but does a realloc.

Parameters:

`[in]`	ptr	The block of memory to reallocate.
`[in]`	size	The requested size.

Returns:: Block of memory of requested size.

Deprecated:: . Code which uses ff_realloc_static is broken/misdesigned and should correctly use static arrays

Definition at line 90 of file libavcodec/utils.c.

Referenced by alloc_table().

void av_free_static ( void )

Frees all static arrays and resets their pointers to 0.

Call this function to release all statically allocated tables.

Deprecated:: . Code which uses av_free_static is broken/misdesigned and should correctly use static arrays

Definition at line 106 of file libavcodec/utils.c.

Referenced by do_free().

static void do_free ( void ) [static]

Call av_free_static automatically before it's too late.

Definition at line 118 of file libavcodec/utils.c.

void register_avcodec ( AVCodec * format )

Definition at line 129 of file libavcodec/utils.c.

void avcodec_set_dimensions	(	AVCodecContext *	s,
		int	width,
		int	height
	)

void avcodec_align_dimensions	(	AVCodecContext *	s,
		int *	width,
		int *	height
	)

Definition at line 158 of file libavcodec/utils.c.

Referenced by avcodec_default_get_buffer().

int avcodec_check_dimensions	(	void *	av_log_ctx,
		unsigned int	w,
		unsigned int	h
	)

Checks if the given dimension of a picture is valid, meaning that all bytes of the picture can be addressed with a signed int.

Parameters:

`[in]`	w	Width of the picture.
`[in]`	h	Height of the picture.

Returns:: Zero if valid, a negative value if invalid.

Definition at line 215 of file libavcodec/utils.c.

Referenced by avcodec_decode_video(), avcodec_default_get_buffer(), avcodec_encode_video(), avcodec_open(), avpicture_fill(), codec_reinit(), decode_frame(), decode_init(), decode_seq_parameter_set(), dnxhd_decode_frame(), encode_init(), ff_mjpeg_decode_sof(), ff_pnm_decode_header(), flashsv_encode_init(), flv_h263_decode_picture_header(), gif_decode_frame(), iv_decode_frame(), mm_decode_init(), MPV_common_init(), ptx_decode_frame(), qtrle_encode_init(), roq_encode_init(), rv20_decode_picture_header(), theora_decode_header(), tiff_decode_tag(), txd_decode_frame(), vqa_decode_init(), and xan_decode_init().

int avcodec_default_get_buffer	(	AVCodecContext *	s,
		AVFrame *	pic
	)

Definition at line 223 of file libavcodec/utils.c.

Referenced by avcodec_get_context_defaults2(), and AvFormatDecoder::InitVideoCodec().

void avcodec_default_release_buffer	(	AVCodecContext *	s,
		AVFrame *	pic
	)

Definition at line 337 of file libavcodec/utils.c.

Referenced by avcodec_get_context_defaults2(), AvFormatDecoder::InitVideoCodec(), and release_avf_buffer().

int avcodec_default_reget_buffer	(	AVCodecContext *	s,
		AVFrame *	pic
	)

Definition at line 363 of file libavcodec/utils.c.

Referenced by avcodec_get_context_defaults2().

int avcodec_default_execute	(	AVCodecContext *	c,
		int()(AVCodecContext c2, void *arg2)	func,
		void **	arg,
		int *	ret,
		int	count
	)

Definition at line 395 of file libavcodec/utils.c.

Referenced by avcodec_get_context_defaults2().

enum PixelFormat avcodec_default_get_format	(	struct AVCodecContext *	s,
		const enum PixelFormat *	fmt
	)

Definition at line 405 of file libavcodec/utils.c.

Referenced by avcodec_get_context_defaults2().

void avcodec_default_decode_cc_dvd	(	AVCodecContext *	c,
		const uint8_t *	buf,
		int	buf_size
	)

Definition at line 409 of file libavcodec/utils.c.

Referenced by avcodec_get_context_defaults2().

static const char* context_to_name ( void * ptr ) [static]

Definition at line 412 of file libavcodec/utils.c.

void avcodec_get_context_defaults2	(	AVCodecContext *	s,
		enum CodecType	codec_type
	)

THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! we WILL change its arguments and name a few times!

Definition at line 774 of file libavcodec/utils.c.

Referenced by avcodec_alloc_context2(), and avcodec_get_context_defaults().

AVCodecContext* avcodec_alloc_context2 ( enum CodecType codec_type )

THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! we WILL change its arguments and name a few times!

Definition at line 804 of file libavcodec/utils.c.

Referenced by avcodec_alloc_context().

void avcodec_get_context_defaults ( AVCodecContext * s )

Sets the fields of the given AVCodecContext to default values.

Parameters:

s

The AVCodecContext of which the fields should be set to default values.

Definition at line 814 of file libavcodec/utils.c.

AVCodecContext* avcodec_alloc_context ( void )

Allocates an AVCodecContext and sets its fields to default values.

The resulting struct can be deallocated by simply calling av_free().

Returns:: An AVCodecContext filled with default values or NULL on failure.

See also:: avcodec_get_context_defaults

Definition at line 818 of file libavcodec/utils.c.

Referenced by audio_decode_example(), audio_encode_example(), av_new_stream(), MPEG2fixup::BuildFrame(), MHIBitmap::CreateFromMPEG(), encode_mp2_audio(), estimate_best_b_count(), H263Container::H263StartDecoder(), H263Container::H263StartEncoder(), AudioOutputDigitalEncoder::Init(), NuppelDecoder::InitAVCodecAudio(), NuppelDecoder::InitAVCodecVideo(), main(), new_pes_av_stream(), new_section_av_stream(), NuppelVideoRecorder::SetupAVCodecVideo(), video_decode_example(), and video_encode_example().

void avcodec_get_frame_defaults ( AVFrame * pic )

Sets the fields of the given AVFrame to default values.

Parameters:

pic

The AVFrame of which the fields should be set to default values.

Definition at line 822 of file libavcodec/utils.c.

Referenced by avcodec_alloc_frame(), bmp_decode_init(), bmp_encode_init(), common_init(), encode_init(), estimate_best_b_count(), gif_decode_init(), H263Container::H263StartEncoder(), png_dec_init(), png_enc_init(), ptx_init(), sgi_init(), targa_init(), tiff_init(), and txd_init().

AVFrame* avcodec_alloc_frame ( void )

Allocates an AVFrame and sets its fields to default values.

The resulting struct can be deallocated by simply calling av_free().

Returns:: An AVFrame filled with default values or NULL on failure.

See also:: avcodec_get_frame_defaults

Definition at line 829 of file libavcodec/utils.c.

Referenced by AC3_encode_init(), adpcm_encode_init(), adx_encode_init(), amr_nb_encode_init(), amr_wb_encode_init(), MPEG2fixup::BuildFrame(), MHIBitmap::CreateFromMPEG(), encode_init(), Faac_encode_init(), flac_encode_init(), g726_init(), grabThumbnail(), H263Container::H263StartDecoder(), libgsm_init(), MP3lame_encode_init(), MPA_encode_init(), oggvorbis_encode_init(), pcm_encode_init(), roq_dpcm_encode_init(), sonic_encode_init(), video_decode_example(), video_encode_example(), and vorbis_encode_init().

int attribute_align_arg avcodec_open	(	AVCodecContext *	avctx,
		AVCodec *	codec
	)

Initializes the AVCodecContext to use the given AVCodec.

Prior to using this function the context has to be allocated.

The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(), avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for retrieving a codec.

Warning:: This function is not thread safe!

 avcodec_register_all();
 codec = avcodec_find_decoder(CODEC_ID_H264);
 if (!codec)
     exit(1);

 context = avcodec_alloc_context();

 if (avcodec_open(context, codec) < 0)
     exit(1);

Parameters:

	avctx	The context which will be set up to use the given codec.
	codec	The codec to use within the context.

Returns:: zero on success, a negative value on error

See also:: avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder

Definition at line 839 of file libavcodec/utils.c.

Referenced by audio_decode_example(), audio_encode_example(), MPEG2fixup::BuildFrame(), MHIBitmap::CreateFromMPEG(), encode_mp2_audio(), estimate_best_b_count(), grabThumbnail(), H263Container::H263ForceIFrame(), H263Container::H263StartDecoder(), H263Container::H263StartEncoder(), AudioOutputDigitalEncoder::Init(), NuppelDecoder::InitAVCodecAudio(), NuppelDecoder::InitAVCodecVideo(), avfDecoder::initialize(), AvFormatDecoder::ScanStreams(), NuppelVideoRecorder::SetupAVCodecVideo(), try_decode_frame(), video_decode_example(), and video_encode_example().

int attribute_align_arg avcodec_encode_audio	(	AVCodecContext *	avctx,
		uint8_t *	buf,
		int	buf_size,
		const short *	samples
	)

Encodes an audio frame from samples into buf.

The avcodec_encode_audio() function encodes an audio frame from the input buffer samples. To encode it, it makes use of the audio codec which was coupled with avctx using avcodec_open(). The resulting encoded frame is stored in output buffer buf.

Note:: The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.

Parameters:

	avctx	the codec context
`[out]`	buf	the output buffer
`[in]`	buf_size	the output buffer size
`[in]`	samples	the input buffer containing the samples

Returns:: On error a negative value is returned, on succes zero or the number of bytes used from the input buffer.

Definition at line 890 of file libavcodec/utils.c.

Referenced by audio_encode_example(), AudioOutputDigitalEncoder::Encode(), and encode_mp2_audio().

int attribute_align_arg avcodec_encode_video	(	AVCodecContext *	avctx,
		uint8_t *	buf,
		int	buf_size,
		const AVFrame *	pict
	)

Encodes a video frame from pict into buf.

The avcodec_encode_video() function encodes a video frame from the input pict. To encode it, it makes use of the video codec which was coupled with avctx using avcodec_open(). The resulting encoded bytes representing the frame are stored in the output buffer buf. The input picture should be stored using a specific format, namely avctx.pix_fmt.

Parameters:

	avctx	the codec context
`[out]`	buf	the output buffer for the bitstream of encoded frame
`[in]`	buf_size	the size of the output buffer in bytes
`[in]`	pict	the input picture to encode

Returns:: On error a negative value is returned, on success zero or the number of bytes used from the input buffer.

Definition at line 905 of file libavcodec/utils.c.

Referenced by MPEG2fixup::BuildFrame(), estimate_best_b_count(), H263Container::H263EncodeFrame(), H263Container::H263ForceIFrame(), H263Container::H263StopEncoder(), video_encode_example(), and NuppelVideoRecorder::WriteVideo().

int avcodec_encode_subtitle	(	AVCodecContext *	avctx,
		uint8_t *	buf,
		int	buf_size,
		const AVSubtitle *	sub
	)

Definition at line 924 of file libavcodec/utils.c.

int attribute_align_arg avcodec_decode_video	(	AVCodecContext *	avctx,
		AVFrame *	picture,
		int *	got_picture_ptr,
		uint8_t *	buf,
		int	buf_size
	)

Decodes a video frame from buf into picture.

The avcodec_decode_video() function decodes a video frame from the input buffer buf of size buf_size. To decode it, it makes use of the video codec which was coupled with avctx using avcodec_open(). The resulting decoded frame is stored in picture.

Warning:: The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than the actual read bytes because some optimized bitstream readers read 32 or 64 bits at once and could read over the end.
The end of the input buffer buf should be set to 0 to ensure that no overreading happens for damaged MPEG streams.

Note:: You might have to align the input buffer buf and output buffer samples. The alignment requirements depend on the CPU: on some CPUs it isn't necessary at all, on others it won't work at all if not aligned and on others it will work but it will have an impact on performance. In practice, the bitstream should have 4 byte alignment at minimum and all sample data should be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If the linesize is not a multiple of 16 then there's no sense in aligning the start of the buffer to 16.

Parameters:

	avctx	the codec context
`[out]`	picture	The AVFrame in which the decoded video frame will be stored.
`[in]`	buf	the input buffer
`[in]`	buf_size	the size of the input buffer in bytes
`[in,out]`	got_picture_ptr	Zero if no frame could be decompressed, otherwise, it is nonzero.

Returns:: On error a negative value is returned, otherwise the number of bytes used or zero if no frame could be decompressed.

Definition at line 933 of file libavcodec/utils.c.

Referenced by MHIBitmap::CreateFromMPEG(), NuppelDecoder::DecodeFrame(), AvFormatDecoderPrivate::DecodeMPEG2Video(), AvFormatDecoder::GetFrame(), ThumbFinder::getFrameImage(), grabThumbnail(), H263Container::H263DecodeFrame(), H263Container::H263StopDecoder(), try_decode_frame(), and video_decode_example().

int attribute_align_arg avcodec_decode_audio2	(	AVCodecContext *	avctx,
		int16_t *	samples,
		int *	frame_size_ptr,
		uint8_t *	buf,
		int	buf_size
	)

Decodes an audio frame from buf into samples.

The avcodec_decode_audio2() function decodes an audio frame from the input buffer buf of size buf_size. To decode it, it makes use of the audio codec which was coupled with avctx using avcodec_open(). The resulting decoded frame is stored in output buffer samples. If no frame could be decompressed, frame_size_ptr is zero. Otherwise, it is the decompressed frame size in bytes.

Warning:

You must set frame_size_ptr to the allocated size of the output buffer before calling avcodec_decode_audio2().

The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than the actual read bytes because some optimized bitstream readers read 32 or 64 bits at once and could read over the end.

The end of the input buffer buf should be set to 0 to ensure that no overreading happens for damaged MPEG streams.

Note:: You might have to align the input buffer buf and output buffer samples. The alignment requirements depend on the CPU: On some CPUs it isn't necessary at all, on others it won't work at all if not aligned and on others it will work but it will have an impact on performance. In practice, the bitstream should have 4 byte alignment at minimum and all sample data should be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If the linesize is not a multiple of 16 then there's no sense in aligning the start of the buffer to 16.

Parameters:

	avctx	the codec context
`[out]`	samples	the output buffer
`[in,out]`	frame_size_ptr	the output buffer size in bytes
`[in]`	buf	the input buffer
`[in]`	buf_size	the input buffer size in bytes

Returns:: On error a negative value is returned, otherwise the number of bytes used or zero if no frame could be decompressed.

Definition at line 956 of file libavcodec/utils.c.

Referenced by avcodec_decode_audio(), and try_decode_frame().

int avcodec_decode_audio	(	AVCodecContext *	avctx,
		int16_t *	samples,
		int *	frame_size_ptr,
		uint8_t *	buf,
		int	buf_size
	)

Deprecated:: Use avcodec_decode_audio2() instead.

Definition at line 985 of file libavcodec/utils.c.

Referenced by audio_decode_example(), NuppelDecoder::GetFrame(), AvFormatDecoder::GetFrame(), and avfDecoder::run().

int avcodec_decode_subtitle	(	AVCodecContext *	avctx,
		AVSubtitle *	sub,
		int *	got_sub_ptr,
		const uint8_t *	buf,
		int	buf_size
	)

Definition at line 993 of file libavcodec/utils.c.

Referenced by AvFormatDecoder::GetFrame().

int avcodec_close ( AVCodecContext * avctx )

AVCodec* avcodec_find_encoder ( enum CodecID id )

Finds a registered encoder with a matching codec ID.

Parameters:

id

CodecID of the requested encoder

Returns:: An encoder if one was found, NULL otherwise.

Definition at line 1027 of file libavcodec/utils.c.

Referenced by asf_write_header1(), audio_encode_example(), avcodec_string(), MPEG2fixup::BuildFrame(), encode_mp2_audio(), estimate_best_b_count(), H263Container::H263StartEncoder(), AudioOutputDigitalEncoder::Init(), and video_encode_example().

AVCodec* avcodec_find_encoder_by_name ( const char * name )

Finds a registered encoder with the specified name.

Parameters:

name

name of the requested encoder

Returns:: An encoder if one was found, NULL otherwise.

Definition at line 1039 of file libavcodec/utils.c.

Referenced by NuppelVideoRecorder::SetupAVCodecVideo().

AVCodec* avcodec_find_decoder ( enum CodecID id )

Finds a registered decoder with a matching codec ID.

Parameters:

id

CodecID of the requested decoder

Returns:: A decoder if one was found, NULL otherwise.

Definition at line 1051 of file libavcodec/utils.c.

Referenced by audio_decode_example(), avcodec_string(), MHIBitmap::CreateFromMPEG(), grabThumbnail(), H263Container::H263StartDecoder(), NuppelDecoder::InitAVCodecAudio(), NuppelDecoder::InitAVCodecVideo(), avfDecoder::initialize(), AvFormatDecoder::InitVideoCodec(), AvFormatDecoder::ScanStreams(), sdp_parse_rtpmap(), try_decode_frame(), and video_decode_example().

AVCodec* avcodec_find_decoder_by_name ( const char * name )

Finds a registered decoder with the specified name.

Parameters:

name

name of the requested decoder

Returns:: A decoder if one was found, NULL otherwise.

Definition at line 1063 of file libavcodec/utils.c.

void avcodec_string	(	char *	buf,
		int	buf_size,
		AVCodecContext *	enc,
		int	encode
	)

Definition at line 1075 of file libavcodec/utils.c.

Referenced by av_find_stream_info(), dump_stream_format(), and getFileInfo().

unsigned avcodec_version ( void )

Definition at line 1237 of file libavcodec/utils.c.

unsigned avcodec_build ( void )

Definition at line 1242 of file libavcodec/utils.c.

static void init_crcs ( void ) [static]

Definition at line 1247 of file libavcodec/utils.c.

Referenced by avcodec_init().

void avcodec_init ( void )

Initializes libavcodec.

Warning:: This function must be called before any other libavcodec function.

Definition at line 1258 of file libavcodec/utils.c.

Referenced by av_register_all(), H263Container::H263Container(), SignalMonitor::Init(), main(), NuppelDecoder::NuppelDecoder(), and RecorderBase::RecorderBase().

void avcodec_flush_buffers ( AVCodecContext * avctx )

Flush buffers, should be called when seeking or when switching to a different stream.

Definition at line 1270 of file libavcodec/utils.c.

Referenced by grabThumbnail(), NuppelDecoder::SeekReset(), AvFormatDecoder::SeekReset(), and ThumbFinder::seekToFrame().

void avcodec_default_free_buffers ( AVCodecContext * s )

Definition at line 1276 of file libavcodec/utils.c.

Referenced by avcodec_close(), and MPV_common_end().

char av_get_pict_type_char ( int pict_type )

Returns a single letter to describe the given picture type pict_type.

Parameters:

[in] pict_type the picture type

Returns:: A single character representing the picture type.

Definition at line 1293 of file libavcodec/utils.c.

Referenced by decode_mb_cavlc(), decode_slice_header(), ff_rate_estimate_qscale(), flv_h263_decode_picture_header(), show_pict_info(), and svq3_decode_frame().

int av_get_bits_per_sample ( enum CodecID codec_id )

Returns codec bits per sample.

Parameters:

[in] codec_id the codec

Returns:: Number of bits per sample or zero if unknown for the given codec.

Definition at line 1305 of file libavcodec/utils.c.

Referenced by aiff_write_header(), av_find_stream_info(), get_aiff_header(), get_audio_frame_size(), mkv_write_tracks(), mov_read_stsd(), mov_write_header(), pcm_decode_frame(), pcm_read_seek(), and voc_get_packet().

int av_get_bits_per_sample_format ( enum SampleFormat sample_fmt )

Returns sample format bits per sample.

Parameters:

[in] sample_fmt the sample format

Returns:: Number of bits per sample or zero if unknown for the given sample format.

Definition at line 1340 of file libavcodec/utils.c.

Referenced by mkv_write_tracks().

int avcodec_thread_init	(	AVCodecContext *	s,
		int	thread_count
	)

Definition at line 1357 of file libavcodec/utils.c.

unsigned int av_xiphlacing	(	unsigned char *	s,
		unsigned int	v
	)

Definition at line 1362 of file libavcodec/utils.c.

Referenced by fixup_vorbis_headers(), oggvorbis_encode_init(), and put_main_header().

int av_tempfile	(	char *	prefix,
		char **	filename
	)

Definition at line 1381 of file libavcodec/utils.c.

Referenced by ff_xvid_encode_init(), and ff_xvid_rate_control_init().

int av_parse_video_frame_size	(	int *	width_ptr,
		int *	height_ptr,
		const char *	str
	)

Parses str and put in width_ptr and height_ptr the detected values.

Returns:: 0 in case of a successful parsing, a negative value otherwise

Parameters:

`[in]`	str	the string to parse: it has to be a string in the format <width>x<height> or a valid video frame size abbreviation.
`[in,out]`	width_ptr	pointer to the variable which will contain the detected frame width value
`[in,out]`	height_ptr	pointer to the variable which will contain the detected frame height value

Definition at line 1472 of file libavcodec/utils.c.

Referenced by parse_image_size().

int av_parse_video_frame_rate	(	AVRational *	frame_rate,
		const char *	str
	)

Parses str and put in frame_rate the detected values.

Returns:: 0 in case of a successful parsing, a negative value otherwise

Parameters:

`[in]`	str	the string to parse: it has to be a string in the format <frame_rate_nom>/<frame_rate_den>, a float number or a valid video rate abbreviation
`[in,out]`	frame_rate	pointer to the AVRational which will contain the detected frame rate

Definition at line 1500 of file libavcodec/utils.c.

Referenced by parse_frame_rate().

Variable Documentation

const uint8_t ff_reverse[256]

Initial value:

{
0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0,
0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8,
0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4,
0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC,
0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2,
0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA,
0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6,
0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE,
0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1,
0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9,
0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5,
0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD,
0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3,
0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB,
0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7,
0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF,
}

Definition at line 41 of file libavcodec/utils.c.

Referenced by asv2_get_bits(), asv2_put_bits(), decode_frame(), encode_frame(), ir2_decode_frame(), pcm_decode_frame(), pcm_encode_frame(), and wnv1_get_code().

int volatile entangled_thread_counter = 0 [static]

Definition at line 60 of file libavcodec/utils.c.

Referenced by avcodec_close(), and avcodec_open().

unsigned int last_static = 0 [static]

Definition at line 72 of file libavcodec/utils.c.

Referenced by av_free_static(), av_mallocz_static(), and ff_realloc_static().

unsigned int allocated_static = 0 [static]

Definition at line 73 of file libavcodec/utils.c.

Referenced by av_mallocz_static().

void** array_static = NULL [static]

Definition at line 74 of file libavcodec/utils.c.

Referenced by av_free_static(), av_mallocz_static(), and ff_realloc_static().

AVCodec* first_avcodec = NULL

Definition at line 127 of file libavcodec/utils.c.

Referenced by AvFormatDecoder::ScanStreams().

AVClass av_codec_context_class = { "AVCodecContext", context_to_name, options } [static]

Definition at line 772 of file libavcodec/utils.c.

VideoFrameSizeAbbr video_frame_size_abbrs[] [static]

Definition at line 1422 of file libavcodec/utils.c.

VideoFrameRateAbbr video_frame_rate_abbrs[] [static]

Initial value:

 {
    { "ntsc",      30000, 1001 },
    { "pal",          25,    1 },
    { "qntsc",     30000, 1001 }, 
    { "qpal",         25,    1 }, 
    { "sntsc",     30000, 1001 }, 
    { "spal",         25,    1 }, 
    { "film",         24,    1 },
    { "ntsc-film", 24000, 1001 },
}

Definition at line 1461 of file libavcodec/utils.c.


Classes
struct	InternalBuffer
struct	VideoFrameSizeAbbr
struct	VideoFrameRateAbbr
Functions
void *	av_fast_realloc (void ptr, unsigned int size, unsigned int min_size)
	Reallocates the given block if it is not large enough, otherwise it does nothing.
void *	av_mallocz_static (unsigned int size)
	Allocation of static arrays.
void *	ff_realloc_static (void *ptr, unsigned int size)
	Same as av_mallocz_static(), but does a realloc.
void	av_free_static (void)
	Frees all static arrays and resets their pointers to 0.
static void	do_free (void)
	Call av_free_static automatically before it's too late.
void	register_avcodec (AVCodec *format)
void	avcodec_set_dimensions (AVCodecContext *s, int width, int height)
void	avcodec_align_dimensions (AVCodecContext s, int width, int *height)
int	avcodec_check_dimensions (void *av_log_ctx, unsigned int w, unsigned int h)
	Checks if the given dimension of a picture is valid, meaning that all bytes of the picture can be addressed with a signed int.
int	avcodec_default_get_buffer (AVCodecContext s, AVFrame pic)
void	avcodec_default_release_buffer (AVCodecContext s, AVFrame pic)
int	avcodec_default_reget_buffer (AVCodecContext s, AVFrame pic)
int	avcodec_default_execute (AVCodecContext c, int(func)(AVCodecContext c2, void arg2), void *arg, int ret, int count)
enum PixelFormat	avcodec_default_get_format (struct AVCodecContext s, const enum PixelFormat fmt)
void	avcodec_default_decode_cc_dvd (AVCodecContext c, const uint8_t buf, int buf_size)
static const char *	context_to_name (void *ptr)
void	avcodec_get_context_defaults2 (AVCodecContext *s, enum CodecType codec_type)
	THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! we WILL change its arguments and name a few times!
AVCodecContext *	avcodec_alloc_context2 (enum CodecType codec_type)
	THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! we WILL change its arguments and name a few times!
void	avcodec_get_context_defaults (AVCodecContext *s)
	Sets the fields of the given AVCodecContext to default values.
AVCodecContext *	avcodec_alloc_context (void)
	Allocates an AVCodecContext and sets its fields to default values.
void	avcodec_get_frame_defaults (AVFrame *pic)
	Sets the fields of the given AVFrame to default values.
AVFrame *	avcodec_alloc_frame (void)
	Allocates an AVFrame and sets its fields to default values.
int attribute_align_arg	avcodec_open (AVCodecContext avctx, AVCodec codec)
	Initializes the AVCodecContext to use the given AVCodec.
int attribute_align_arg	avcodec_encode_audio (AVCodecContext avctx, uint8_t buf, int buf_size, const short *samples)
	Encodes an audio frame from `samples` into `buf`.
int attribute_align_arg	avcodec_encode_video (AVCodecContext avctx, uint8_t buf, int buf_size, const AVFrame *pict)
	Encodes a video frame from `pict` into `buf`.
int	avcodec_encode_subtitle (AVCodecContext avctx, uint8_t buf, int buf_size, const AVSubtitle *sub)
int attribute_align_arg	avcodec_decode_video (AVCodecContext avctx, AVFrame picture, int got_picture_ptr, uint8_t buf, int buf_size)
	Decodes a video frame from `buf` into `picture`.
int attribute_align_arg	avcodec_decode_audio2 (AVCodecContext avctx, int16_t samples, int frame_size_ptr, uint8_t buf, int buf_size)
	Decodes an audio frame from `buf` into `samples`.
int	avcodec_decode_audio (AVCodecContext avctx, int16_t samples, int frame_size_ptr, uint8_t buf, int buf_size)
int	avcodec_decode_subtitle (AVCodecContext avctx, AVSubtitle sub, int got_sub_ptr, const uint8_t buf, int buf_size)
int	avcodec_close (AVCodecContext *avctx)
AVCodec *	avcodec_find_encoder (enum CodecID id)
	Finds a registered encoder with a matching codec ID.
AVCodec *	avcodec_find_encoder_by_name (const char *name)
	Finds a registered encoder with the specified name.
AVCodec *	avcodec_find_decoder (enum CodecID id)
	Finds a registered decoder with a matching codec ID.
AVCodec *	avcodec_find_decoder_by_name (const char *name)
	Finds a registered decoder with the specified name.
void	avcodec_string (char buf, int buf_size, AVCodecContext enc, int encode)
unsigned	avcodec_version (void)
unsigned	avcodec_build (void)
static void	init_crcs (void)
void	avcodec_init (void)
	Initializes libavcodec.
void	avcodec_flush_buffers (AVCodecContext *avctx)
	Flush buffers, should be called when seeking or when switching to a different stream.
void	avcodec_default_free_buffers (AVCodecContext *s)
char	av_get_pict_type_char (int pict_type)
	Returns a single letter to describe the given picture type `pict_type`.
int	av_get_bits_per_sample (enum CodecID codec_id)
	Returns codec bits per sample.
int	av_get_bits_per_sample_format (enum SampleFormat sample_fmt)
	Returns sample format bits per sample.
int	avcodec_thread_init (AVCodecContext *s, int thread_count)
unsigned int	av_xiphlacing (unsigned char *s, unsigned int v)
int	av_tempfile (char prefix, char *filename)
int	av_parse_video_frame_size (int width_ptr, int height_ptr, const char *str)
	Parses `str` and put in `width_ptr` and `height_ptr` the detected values.
int	av_parse_video_frame_rate (AVRational frame_rate, const char arg)
	Parses `str` and put in `frame_rate` the detected values.
Variables
const uint8_t	ff_reverse [256]
static int volatile	entangled_thread_counter = 0
static unsigned int	last_static = 0
static unsigned int	allocated_static = 0
static void **	array_static = NULL
AVCodec *	first_avcodec = NULL
static const AVOption	options []
static AVClass	av_codec_context_class = { "AVCodecContext", context_to_name, options }
static VideoFrameSizeAbbr	video_frame_size_abbrs []
static VideoFrameRateAbbr	video_frame_rate_abbrs []