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Miscellaneous utility functions related to both encoding and decoding (or neither). More...

Modules Pixel formats Functions for working with pixel formats.
FFT functions Data Structures struct AVBitStreamFilterContext struct AVBitStreamFilter Enumerations enum AVLockOp { AV_LOCK_CREATE , AV_LOCK_OBTAIN , AV_LOCK_RELEASE , AV_LOCK_DESTROY Lock operation used by lockmgr. More...
Functions void avcodec_set_dimensions ( AVCodecContext * s , int width , int height ) size_t av_get_codec_tag_string (char * buf , size_t buf_size, unsigned int codec_tag) Put a string representing the codec tag codec_tag in buf.
void avcodec_string (char * buf , int buf_size, AVCodecContext *enc, int encode) const char * av_get_profile_name (const AVCodec *codec, int profile) Return a name for the specified profile, if available.
int avcodec_default_execute ( AVCodecContext * c , int(* func )( AVCodecContext * c2 , void *arg2), void * arg , int * ret , int count , int size ) int avcodec_default_execute2 ( AVCodecContext * c , int(* func )( AVCodecContext * c2 , void *arg2, int, int), void * arg , int * ret , int count ) int avcodec_fill_audio_frame ( AVFrame * frame , int nb_channels , enum AVSampleFormat sample_fmt, const uint8_t * buf , int buf_size, int align ) Fill AVFrame audio data and linesize pointers.
void avcodec_flush_buffers ( AVCodecContext *avctx) Reset the internal decoder state / flush internal buffers.
int av_get_bits_per_sample (enum AVCodecID codec_id ) Return codec bits per sample.
enum AVCodecID av_get_pcm_codec (enum AVSampleFormat fmt , int be) Return the PCM codec associated with a sample format.
int av_get_exact_bits_per_sample (enum AVCodecID codec_id ) Return codec bits per sample.
int av_get_audio_frame_duration ( AVCodecContext *avctx, int frame_bytes) Return audio frame duration.
void av_register_bitstream_filter ( AVBitStreamFilter *bsf) Register a bitstream filter.
AVBitStreamFilterContext * av_bitstream_filter_init (const char * name ) Create and initialize a bitstream filter context given a bitstream filter name.
int av_bitstream_filter_filter ( AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char * args , uint8_t **poutbuf, int *poutbuf_size, const uint8_t * buf , int buf_size, int keyframe) Filter bitstream.
void av_bitstream_filter_close ( AVBitStreamFilterContext *bsf) Release bitstream filter context.
AVBitStreamFilter * av_bitstream_filter_next ( AVBitStreamFilter *f) If f is NULL, return the first registered bitstream filter, if f is non-NULL, return the next registered bitstream filter after f, or NULL if f is the last one.
void * av_fast_realloc ( void *ptr, unsigned int * size , size_t min_size) Reallocate the given block if it is not large enough, otherwise do nothing.
void av_fast_malloc ( void *ptr, unsigned int * size , size_t min_size) Allocate a buffer, reusing the given one if large enough.
void av_fast_padded_malloc ( void *ptr, unsigned int * size , size_t min_size) Same behaviour av_fast_malloc but the buffer has additional FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
void av_fast_padded_mallocz ( void *ptr, unsigned int * size , size_t min_size) Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call.
unsigned int av_xiphlacing (unsigned char * s , unsigned int v ) Encode extradata length to a buffer.
void av_register_hwaccel ( AVHWAccel *hwaccel) Register the hardware accelerator hwaccel.
AVHWAccel * av_hwaccel_next ( AVHWAccel *hwaccel) If hwaccel is NULL, returns the first registered hardware accelerator, if hwaccel is non-NULL, returns the next registered hardware accelerator after hwaccel, or NULL if hwaccel is the last one.
int av_lockmgr_register (int(* cb )( void ** mutex , enum AVLockOp op )) Register a user provided lock manager supporting the operations specified by AVLockOp.
enum AVMediaType avcodec_get_type (enum AVCodecID codec_id ) Get the type of the given codec.
const char * avcodec_get_name (enum AVCodecID id ) Get the name of a codec.
int avcodec_is_open ( AVCodecContext * s ) int av_codec_is_encoder (const AVCodec *codec) int av_codec_is_decoder (const AVCodec *codec) const AVCodecDescriptor * avcodec_descriptor_get (enum AVCodecID id ) const AVCodecDescriptor * avcodec_descriptor_next (const AVCodecDescriptor *prev) Iterate over all codec descriptors known to libavcodec.
const AVCodecDescriptor * avcodec_descriptor_get_by_name (const char * name )

Detailed Description

Miscellaneous utility functions related to both encoding and decoding (or neither).

Enumeration Type Documentation

Definition at line 234 of file utils.c .

Referenced by apply_param_change() , av_mpeg4_decode_header() , avcodec_open2() , avpriv_dirac_parse_sequence_header() , avs_decode_init() , brpix_decode_frame() , cdxl_decode_frame() , cmv_process_header() , decode_frame() , decode_frame_headers() , decode_init() , dnxhd_decode_frame() , dvdsub_parse_extradata() , dvvideo_decode_frame() , execute_code() , ff_h263_decode_frame() , ff_ivi_decode_frame() , ff_mjpeg_decode_sof() , ff_rv34_decode_frame() , ff_vc1_decode_entry_point() , ff_vc1_decode_sequence_header() , flashsv_decode_frame() , g2m_decode_frame() , gif_decode_frame() , h261_decode_frame() , init_image() , libopenjpeg_decode_frame() , mpeg_decode_postinit() , mpegvideo_extract_headers() , mvc_decode_init() , parse_presentation_segment() , pcx_decode_frame() , process_frame_obj() , ptx_decode_frame() , rv20_decode_picture_header() , smvjpeg_decode_frame() , sunrast_decode_frame() , svq1_decode_frame() , tgq_decode_frame() , tgv_decode_frame() , theora_header() , tqi_decode_frame() , truemotion1_decode_header() , txd_decode_frame() , update_dimensions() , vp56_size_changed() , vp5_parse_header() , vp6_parse_header() , vp8_decode() , and vp8_lossless_decode_frame() .

Returns: the length of the string that would have been generated if enough space had been available, excluding the trailing null

Definition at line 2659 of file utils.c .

Referenced by avcodec_string() , init_muxer() , main() , mov_write_hdlr_tag() , print_pix_fmt_fourccs() , rsd_read_header() , and show_stream() .

Returns: A name for the profile if found, NULL otherwise.

Definition at line 2815 of file utils.c .

Referenced by avcodec_string() , and show_stream() .

Fill AVFrame audio data and linesize pointers.

The buffer buf must be a preallocated buffer with a size big enough to contain the specified samples amount. The filled AVFrame data pointers will point to this buffer.

AVFrame extended_data channel pointers are allocated if necessary for planar audio.

Parameters

framethe AVFrame frame->nb_samples must be set prior to calling the function. This function fills in frame->data, frame->extended_data, frame->linesize[0]. nb_channelschannel count sample_fmtsample format bufbuffer to use for frame data buf_sizesize of buffer alignplane size sample alignment (0 = default)

Returns: >=0 on success, negative error code on failure

Todo:: return the size in bytes required to store the samples in case of success, at the next libavutil bump

Examples:: doc/examples/decoding_encoding.c , and doc/examples/muxing.c .