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Add more Doxygen documentation.
Originally committed as revision 8078 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Panagiotis Issaris
parent
930344d854
commit
f9ec0aa1a9
@ -896,9 +896,9 @@ typedef struct AVCodecContext {
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/**
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* hurry up amount.
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* deprecated in favor of skip_idct and skip_frame
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* - encoding: unused
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* - decoding: set by user. 1-> skip b frames, 2-> skip idct/dequant too, 5-> skip everything except header
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* @deprecated Deprecated in favor of skip_idct and skip_frame.
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*/
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int hurry_up;
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@ -2439,7 +2439,7 @@ attribute_deprecated void img_resample_close(ImgReSampleContext *s);
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* @param pix_fmt the format of the picture.
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* @param width the width of the picture.
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* @param height the height of the picture.
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* @return 0 if successful, -1 if not.
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* @return Zero if successful, a negative value if not.
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*/
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int avpicture_alloc(AVPicture *picture, int pix_fmt, int width, int height);
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@ -2493,24 +2493,95 @@ extern AVCodec *first_avcodec;
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unsigned avcodec_version(void);
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/* returns LIBAVCODEC_BUILD constant */
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unsigned avcodec_build(void);
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/**
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* Initializes libavcodec.
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*
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* @warning This function \e must be called before any other libavcodec
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* function.
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*/
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void avcodec_init(void);
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void register_avcodec(AVCodec *format);
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/**
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* Finds an encoder with a matching codec ID.
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*
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* @param id CodecID of the requested encoder.
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* @return An encoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_encoder(enum CodecID id);
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/**
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* Finds an encoder with the specified name.
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*
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* @param name Name of the requested encoder.
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* @return An encoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_encoder_by_name(const char *name);
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/**
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* Finds a decoder with a matching codec ID.
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*
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* @param id CodecID of the requested decoder.
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* @return A decoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_decoder(enum CodecID id);
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/**
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* Finds an decoder with the specified name.
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*
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* @param name Name of the requested decoder.
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* @return A decoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_decoder_by_name(const char *name);
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void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
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/**
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* Sets the fields of the given AVCodecContext to default values.
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*
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* @param s The AVCodecContext of which the fields should be set to default values.
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*/
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void avcodec_get_context_defaults(AVCodecContext *s);
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/**
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* Allocates an AVCodecContext and sets its fields to default values. The
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* resulting struct can be deallocated by simply calling av_free().
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*
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* @return An AVCodecContext filled with default values or NULL on failure.
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* @see avcodec_get_context_defaults
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*/
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AVCodecContext *avcodec_alloc_context(void);
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/**
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* Sets the fields of the given AVFrame to default values.
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*
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* @param pic The AVFrame of which the fields should be set to default values.
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*/
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void avcodec_get_frame_defaults(AVFrame *pic);
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/**
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* Allocates an AVFrame and sets its fields to default values. The resulting
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* struct can be deallocated by simply calling av_free().
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*
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* @return An AVFrame filled with default values or NULL on failure.
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* @see avcodec_get_frame_defaults
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*/
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AVFrame *avcodec_alloc_frame(void);
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int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
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void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
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int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
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void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
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/**
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* Checks if the given dimension of a picture is valid, meaning that all
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* bytes of the picture can be addressed with a signed int.
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*
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* @param[in] w Width of the picture.
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* @param[in] h Height of the picture.
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* @return Zero if valid, a negative value if invalid.
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*/
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int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
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enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
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@ -2521,28 +2592,111 @@ int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, v
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//FIXME func typedef
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/**
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* opens / inits the AVCodecContext.
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* not thread save!
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* Initializes the AVCodecContext to use the given AVCodec. Prior to using this
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* function the context has to be allocated.
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*
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* The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
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* avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
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* retrieving a codec.
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*
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* @warning This function is not thread save!
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*
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* @code
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* codec = avcodec_find_decoder(CODEC_ID_H264);
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* if (!codec)
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* exit(1);
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*
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* context = avcodec_alloc_context();
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*
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* if (avcodec_open(context, codec) < 0)
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* exit(1);
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* @endcode
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*
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* @param avctx The context which will be setup to use the given codec.
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* @param codec The codec to use within the context.
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* @return Zero on success, a negative value on error.
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* @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
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*/
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int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
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/**
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* @deprecated Use avcodec_decode_audio2() instead.
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*/
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attribute_deprecated int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
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int *frame_size_ptr,
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uint8_t *buf, int buf_size);
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/**
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* Decode an audio frame.
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* Decodes an audio frame from \p buf into \p samples.
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* The avcodec_decode_audio2() function decodes a frame of audio from the input
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* buffer \p buf of size \p buf_size. To decode it, it makes use of the
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* audiocodec which was coupled with \p avctx using avcodec_open(). The
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* resulting decoded frame is stored in output buffer \p samples. If no frame
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* could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
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* decompressed frame size in \e bytes.
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*
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* @param avctx the codec context.
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* @param samples output buffer, 16 byte aligned
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* @param frame_size_ptr the output buffer size in bytes (you MUST set this to the allocated size before calling avcodec_decode_audio2()), zero if no frame could be compressed
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* @param buf input buffer, 16 byte aligned
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* @param buf_size the input buffer size
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* @return 0 if successful, -1 if not.
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* @warning You \e must set \p frame_size_ptr to the allocated size of the
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* output buffer before calling avcodec_decode_audio2().
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*
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* @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
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* the actual read bytes because some optimized bitstream readers read 32 or 64
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* bits at once and could read over the end.
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*
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* @warning The end of the input buffer \p buf should be set to 0 to ensure that
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* no overreading happens for damaged MPEG streams.
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*
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* @note You might have to align the input buffer \p buf and output buffer \p
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* samples. The alignment requirements depend on the CPU: on some CPUs it isn't
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* necessary at all, on others it won't work at all if not aligned and on others
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* it will work but it will have an impact on performance. In practice, the
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* bitstream should have 4 byte alignment at minimum and all sample data should
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* be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
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* the linesize is not a multiple of 16 then there's no sense in aligning the
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* start of the buffer to 16.
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*
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* @param avctx The codec context.
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* @param[out] samples The output buffer.
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* @param[in,out] frame_size_ptr The output buffer size in bytes.
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* @param[in] buf The input buffer.
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* @param[in] buf_size The input buffer size in bytes.
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* @return On error a negative value is returned, otherwise the number of bytes
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* used or zero if no frame could be decompressed.
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*/
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int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
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int *frame_size_ptr,
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uint8_t *buf, int buf_size);
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/**
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* Decodes a video frame from \p buf into \p picture.
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* The avcodec_decode_video() function decodes a frame of video from the input
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* buffer \p buf of size \p buf_size. To decode it, it makes use of the
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* videocodec which was coupled with \p avctx using avcodec_open(). The
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* resulting decoded frame is stored in \p picture.
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*
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* @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
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* the actual read bytes because some optimized bitstream readers read 32 or 64
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* bits at once and could read over the end.
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*
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* @warning The end of the input buffer \p buf should be set to 0 to ensure that
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* no overreading happens for damaged MPEG streams.
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*
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* @note You might have to align the input buffer \p buf and output buffer \p
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* samples. The alignment requirements depend on the CPU: on some CPUs it isn't
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* necessary at all, on others it won't work at all if not aligned and on others
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* it will work but it will have an impact on performance. In practice, the
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* bitstream should have 4 byte alignment at minimum and all sample data should
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* be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
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* the linesize is not a multiple of 16 then there's no sense in aligning the
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* start of the buffer to 16.
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*
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* @param avctx The codec context.
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* @param[out] picture The AVFrame in which the decoded video frame will be stored.
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* @param[in] buf The input buffer.
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* @param[in] buf_size The size of the input buffer in bytes.
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* @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is non zero.
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* @return On error a negative value is returned, otherwise the number of bytes
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* used or zero if no frame could be decompressed.
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*/
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int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
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int *got_picture_ptr,
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uint8_t *buf, int buf_size);
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@ -2552,8 +2706,41 @@ int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
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int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
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int *data_size_ptr,
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uint8_t *buf, int buf_size);
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/**
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* Encodes an audio frame from \p samples into \p buf.
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* The avcodec_encode_audio() function encodes a frame of audio from the input
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* buffer \p samples. To encode it, it makes use of the audiocodec which was
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* coupled with \p avctx using avcodec_open(). The resulting encoded frame is
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* stored in output buffer \p buf.
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*
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* @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
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*
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* @param avctx The codec context.
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* @param[out] buf The output buffer.
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* @param[in] buf_size The output buffer size.
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* @param[in] samples The input buffer containing the samples.
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* @return On error a negative value is returned, on succes zero or the number
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* of bytes used from the input buffer.
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*/
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int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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const short *samples);
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/**
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* Encodes a video frame from \p pict into \p buf.
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* The avcodec_encode_video() function encodes a frame of video from the input
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* \p pict. To encode it, it makes use of the videocodec which was coupled with
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* \p avctx using avcodec_open(). The resulting encoded bytes representing the
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* frame are stored in the output buffer \p buf. The input picture should be
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* stored using a specific format, namely \c avctx.pix_fmt.
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*
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* @param avctx The codec context.
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* @param[out] buf The output buffer for the bitstream of encoded frame.
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* @param[in] buf_size The size of the outputbuffer in bytes.
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* @param[in] pict The input picture to encode.
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* @return On error a negative value is returned, on success zero or the number
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* of bytes used from the input buffer.
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*/
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int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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const AVFrame *pict);
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int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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@ -741,11 +741,6 @@ static const AVOption options[]={
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static AVClass av_codec_context_class = { "AVCodecContext", context_to_name, options };
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/**
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* Sets the fields of the given AVCodecContext to default values.
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*
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* @param s The AVCodecContext of which the fields should be set to default values.
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*/
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void avcodec_get_context_defaults(AVCodecContext *s){
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memset(s, 0, sizeof(AVCodecContext));
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@ -767,13 +762,6 @@ void avcodec_get_context_defaults(AVCodecContext *s){
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s->reget_buffer= avcodec_default_reget_buffer;
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}
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/**
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* Allocates an AVCodecContext and sets its fields to default values. The
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* resulting struct can be deallocated by simply calling av_free().
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*
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* @return An AVCodecContext filled with default values or NULL on failure.
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* @see avcodec_get_context_defaults
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*/
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AVCodecContext *avcodec_alloc_context(void){
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AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
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@ -784,11 +772,6 @@ AVCodecContext *avcodec_alloc_context(void){
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return avctx;
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}
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/**
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* Sets its fields of the given AVFrame to default values.
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*
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* @param pic The AVFrame of which the fields should be set to default values.
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*/
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void avcodec_get_frame_defaults(AVFrame *pic){
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memset(pic, 0, sizeof(AVFrame));
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@ -796,13 +779,6 @@ void avcodec_get_frame_defaults(AVFrame *pic){
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pic->key_frame= 1;
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}
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/**
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* Allocates an AVFrame and sets its fields to default values. The resulting
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* struct can be deallocated by simply calling av_free().
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*
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* @return An AVFrame filled with default values or NULL on failure.
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* @see avcodec_get_frame_defaults
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*/
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AVFrame *avcodec_alloc_frame(void){
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AVFrame *pic= av_malloc(sizeof(AVFrame));
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@ -874,13 +850,6 @@ int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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return 0;
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}
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/**
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* encode a frame.
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* @param buf buffer for the bitstream of encoded frame
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* @param buf_size the size of the buffer in bytes
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* @param pict the input picture to encode, in avctx.pix_fmt
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* @return -1 if error
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*/
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int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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const AVFrame *pict)
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{
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@ -909,15 +878,6 @@ int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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return ret;
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}
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/**
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* decode a frame.
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* @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
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* because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
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* @param buf_size the size of the buffer in bytes
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* @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
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* @return -1 if error, otherwise return the number of
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* bytes used.
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*/
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int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
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int *got_picture_ptr,
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uint8_t *buf, int buf_size)
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@ -941,10 +901,6 @@ int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
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return ret;
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}
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/* decode an audio frame. return -1 if error, otherwise return the
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*number of bytes used. If no frame could be decompressed,
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*frame_size_ptr is zero. Otherwise, it is the decompressed frame
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*size in BYTES. */
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int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
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int *frame_size_ptr,
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uint8_t *buf, int buf_size)
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@ -1018,12 +974,6 @@ int avcodec_close(AVCodecContext *avctx)
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return 0;
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}
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/**
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* Find an encoder with a matching codec ID.
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*
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* @param id CodecID of the requested encoder.
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* @return An encoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_encoder(enum CodecID id)
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{
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AVCodec *p;
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@ -1036,12 +986,6 @@ AVCodec *avcodec_find_encoder(enum CodecID id)
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return NULL;
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}
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/**
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* Find an encoder with the specified name.
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*
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* @param name Name of the requested encoder.
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* @return An encoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_encoder_by_name(const char *name)
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{
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AVCodec *p;
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@ -1054,12 +998,6 @@ AVCodec *avcodec_find_encoder_by_name(const char *name)
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return NULL;
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}
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/**
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* Find a decoder with a matching codec ID.
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*
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* @param id CodecID of the requested decoder.
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* @return An decoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_decoder(enum CodecID id)
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{
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AVCodec *p;
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@ -1072,12 +1010,6 @@ AVCodec *avcodec_find_decoder(enum CodecID id)
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return NULL;
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}
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/**
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* Find an decoder with the specified name.
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*
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* @param name Name of the requested decoder.
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* @return An decoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_decoder_by_name(const char *name)
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{
|
||||
AVCodec *p;
|
||||
@ -1262,7 +1194,6 @@ static void init_crcs(void){
|
||||
av_crc_init(av_crc07 , 0, 8, 0x07 , sizeof(AVCRC)*257);
|
||||
}
|
||||
|
||||
/* must be called before any other functions */
|
||||
void avcodec_init(void)
|
||||
{
|
||||
static int inited = 0;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user