#define AVCODEC_AVCODEC_H
/**
- * @file libavcodec/avcodec.h
+ * @file
* external API header
*/
#include "libavutil/avutil.h"
#define LIBAVCODEC_VERSION_MAJOR 52
-#define LIBAVCODEC_VERSION_MINOR 64
-#define LIBAVCODEC_VERSION_MICRO 0
+#define LIBAVCODEC_VERSION_MINOR 78
+#define LIBAVCODEC_VERSION_MICRO 1
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \
#define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
/**
- * Identifies the syntax and semantics of the bitstream.
+ * Identify the syntax and semantics of the bitstream.
* The principle is roughly:
* Two decoders with the same ID can decode the same streams.
* Two encoders with the same ID can encode compatible streams.
CODEC_ID_IFF_BYTERUN1,
CODEC_ID_KGV1,
CODEC_ID_YOP,
+ CODEC_ID_VP8,
+ CODEC_ID_PICTOR,
/* various PCM "codecs" */
CODEC_ID_PCM_S16LE= 0x10000,
#define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
#define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
#define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
+#define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
/* Unsupported options :
* Syntax Arithmetic coding (SAC)
* as a last resort.
*/
#define CODEC_CAP_SUBFRAMES 0x0100
+/**
+ * Codec is experimental and is thus avoided in favor of non experimental
+ * encoders
+ */
+#define CODEC_CAP_EXPERIMENTAL 0x0200
//The following defines may change, don't expect compatibility if you use them.
#define MB_TYPE_INTRA4x4 0x0001
/**
* Pixel format, see PIX_FMT_xxx.
+ * May be set by the demuxer if known from headers.
+ * May be overriden by the decoder if it knows better.
* - encoding: Set by user.
- * - decoding: Set by libavcodec.
+ * - decoding: Set by user if known, overridden by libavcodec if known
*/
enum PixelFormat pix_fmt;
* - encoding: Set by user.
* - decoding: Set by user.
* Setting this to STRICT or higher means the encoder and decoder will
- * generally do stupid things. While setting it to inofficial or lower
- * will mean the encoder might use things that are not supported by all
- * spec compliant decoders. Decoders make no difference between normal,
- * inofficial and experimental, that is they always try to decode things
- * when they can unless they are explicitly asked to behave stupid
+ * generally do stupid things, whereas setting it to inofficial or lower
+ * will mean the encoder might produce output that is not supported by all
+ * spec-compliant decoders. Decoders don't differentiate between normal,
+ * inofficial and experimental (that is, they always try to decode things
+ * when they can) unless they are explicitly asked to behave stupidly
* (=strictly conform to the specs)
*/
int strict_std_compliance;
-#define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
+#define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
#define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
#define FF_COMPLIANCE_NORMAL 0
#define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
* - decoding: unused
*/
int rc_lookahead;
+
+ /**
+ * Constant rate factor maximum
+ * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
+ * than crf_max, even if doing so would violate VBV restrictions.
+ * - encoding: Set by user.
+ * - decoding: unused
+ */
+ float crf_max;
+
+ int log_level_offset;
} AVCodecContext;
/**
int output_rate, int input_rate);
#endif
/**
- * Initializes audio resampling context
+ * Initialize audio resampling context
*
* @param output_channels number of output channels
* @param input_channels number of input channels
/**
- * Initializes an audio resampler.
+ * Initialize an audio resampler.
* Note, if either rate is not an integer then simply scale both rates up so they are.
* @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
* @param log2_phase_count log2 of the number of entries in the polyphase filterbank
struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
/**
- * resamples.
+ * Resample an array of samples using a previously configured context.
* @param src an array of unconsumed samples
* @param consumed the number of samples of src which have been consumed are returned here
* @param src_size the number of unconsumed samples available
/**
- * Compensates samplerate/timestamp drift. The compensation is done by changing
+ * Compensate samplerate/timestamp drift. The compensation is done by changing
* the resampler parameters, so no audible clicks or similar distortions occur
* @param compensation_distance distance in output samples over which the compensation should be performed
* @param sample_delta number of output samples which should be output less
#if LIBAVCODEC_VERSION_MAJOR < 53
/**
- * Returns the pixel format corresponding to the name name.
+ * Return the pixel format corresponding to the name name.
*
- * If there is no pixel format with name name, then looks for a
+ * If there is no pixel format with name name, then look for a
* pixel format with the name corresponding to the native endian
* format of name.
- * For example in a little-endian system, first looks for "gray16",
+ * For example in a little-endian system, first look for "gray16",
* then for "gray16le".
*
- * Finally if no pixel format has been found, returns PIX_FMT_NONE.
+ * Finally if no pixel format has been found, return PIX_FMT_NONE.
*
* @deprecated Deprecated in favor of av_get_pix_fmt().
*/
#endif
/**
- * Returns a value representing the fourCC code associated to the
+ * Return a value representing the fourCC code associated to the
* pixel format pix_fmt, or 0 if no associated fourCC code can be
* found.
*/
unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
+/**
+ * Put a string representing the codec tag codec_tag in buf.
+ *
+ * @param buf_size size in bytes of buf
+ * @return the length of the string that would have been generated if
+ * enough space had been available, excluding the trailing null
+ */
+size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
+
#define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
#define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
#define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
#define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
/**
- * Computes what kind of losses will occur when converting from one specific
+ * Compute what kind of losses will occur when converting from one specific
* pixel format to another.
* When converting from one pixel format to another, information loss may occur.
* For example, when converting from RGB24 to GRAY, the color information will
int has_alpha);
/**
- * Finds the best pixel format to convert to given a certain source pixel
+ * Find the best pixel format to convert to given a certain source pixel
* format. When converting from one pixel format to another, information loss
* may occur. For example, when converting from RGB24 to GRAY, the color
* information will be lost. Similarly, other losses occur when converting from
AVCodec *av_codec_next(AVCodec *c);
/**
- * Returns the LIBAVCODEC_VERSION_INT constant.
+ * Return the LIBAVCODEC_VERSION_INT constant.
*/
unsigned avcodec_version(void);
/**
- * Returns the libavcodec build-time configuration.
+ * Return the libavcodec build-time configuration.
*/
const char *avcodec_configuration(void);
/**
- * Returns the libavcodec license.
+ * Return the libavcodec license.
*/
const char *avcodec_license(void);
/**
- * Initializes libavcodec.
+ * Initialize libavcodec.
*
* @warning This function must be called before any other libavcodec
* function.
void avcodec_register(AVCodec *codec);
/**
- * Finds a registered encoder with a matching codec ID.
+ * Find a registered encoder with a matching codec ID.
*
* @param id CodecID of the requested encoder
* @return An encoder if one was found, NULL otherwise.
AVCodec *avcodec_find_encoder(enum CodecID id);
/**
- * Finds a registered encoder with the specified name.
+ * Find a registered encoder with the specified name.
*
* @param name name of the requested encoder
* @return An encoder if one was found, NULL otherwise.
AVCodec *avcodec_find_encoder_by_name(const char *name);
/**
- * Finds a registered decoder with a matching codec ID.
+ * Find a registered decoder with a matching codec ID.
*
* @param id CodecID of the requested decoder
* @return A decoder if one was found, NULL otherwise.
AVCodec *avcodec_find_decoder(enum CodecID id);
/**
- * Finds a registered decoder with the specified name.
+ * Find a registered decoder with the specified name.
*
* @param name name of the requested decoder
* @return A decoder if one was found, NULL otherwise.
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
/**
- * Sets the fields of the given AVCodecContext to default values.
+ * Set the fields of the given AVCodecContext to default values.
*
* @param s The AVCodecContext of which the fields should be set to default values.
*/
void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
/**
- * Allocates an AVCodecContext and sets its fields to default values. The
+ * Allocate an AVCodecContext and set its fields to default values. The
* resulting struct can be deallocated by simply calling av_free().
*
* @return An AVCodecContext filled with default values or NULL on failure.
AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
/**
- * Sets the fields of the given AVFrame to default values.
+ * Copy the settings of the source AVCodecContext into the destination
+ * AVCodecContext. The resulting destination codec context will be
+ * unopened, i.e. you are required to call avcodec_open() before you
+ * can use this AVCodecContext to decode/encode video/audio data.
+ *
+ * @param dest target codec context, should be initialized with
+ * avcodec_alloc_context(), but otherwise uninitialized
+ * @param src source codec context
+ * @return AVERROR() on error (e.g. memory allocation error), 0 on success
+ */
+int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
+
+/**
+ * Set the fields of the given AVFrame to default values.
*
* @param pic The AVFrame of which the fields should be set to default values.
*/
void avcodec_get_frame_defaults(AVFrame *pic);
/**
- * Allocates an AVFrame and sets its fields to default values. The resulting
+ * Allocate an AVFrame and set its fields to default values. The resulting
* struct can be deallocated by simply calling av_free().
*
* @return An AVFrame filled with default values or NULL on failure.
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);
+
/**
- * Modifies width and height values so that they will result in a memory
+ * Return the amount of padding in pixels which the get_buffer callback must
+ * provide around the edge of the image for codecs which do not have the
+ * CODEC_FLAG_EMU_EDGE flag.
+ *
+ * @return Required padding in pixels.
+ */
+unsigned avcodec_get_edge_width(void);
+/**
+ * Modify width and height values so that they will result in a memory
* buffer that is acceptable for the codec if you do not use any horizontal
* padding.
+ *
+ * May only be used if a codec with CODEC_CAP_DR1 has been opened.
+ * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
+ * according to avcodec_get_edge_width() before.
*/
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
/**
- * Modifies width and height values so that they will result in a memory
+ * Modify width and height values so that they will result in a memory
* buffer that is acceptable for the codec if you also ensure that all
* line sizes are a multiple of the respective linesize_align[i].
+ *
+ * May only be used if a codec with CODEC_CAP_DR1 has been opened.
+ * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
+ * according to avcodec_get_edge_width() before.
*/
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
int linesize_align[4]);
/**
- * Checks if the given dimension of a picture is valid, meaning that all
+ * Check if the given dimension of a picture is valid, meaning that all
* bytes of the picture can be addressed with a signed int.
*
* @param[in] w Width of the picture.
//FIXME func typedef
/**
- * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
+ * Initialize 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(),
#if LIBAVCODEC_VERSION_MAJOR < 53
/**
- * Decodes an audio frame from buf into samples.
+ * Decode an audio frame from buf into samples.
* Wrapper function which calls avcodec_decode_audio3.
*
* @deprecated Use avcodec_decode_audio3 instead.
#endif
/**
- * Decodes the audio frame of size avpkt->size from avpkt->data into samples.
+ * Decode the audio frame of size avpkt->size from avpkt->data into samples.
* Some decoders may support multiple frames in a single AVPacket, such
* decoders would then just decode the first frame. In this case,
* avcodec_decode_audio3 has to be called again with an AVPacket that contains
#if LIBAVCODEC_VERSION_MAJOR < 53
/**
- * Decodes a video frame from buf into picture.
+ * Decode a video frame from buf into picture.
* Wrapper function which calls avcodec_decode_video2.
*
* @deprecated Use avcodec_decode_video2 instead.
#endif
/**
- * Decodes the video frame of size avpkt->size from avpkt->data into picture.
+ * Decode the video frame of size avpkt->size from avpkt->data into picture.
* Some decoders may support multiple frames in a single AVPacket, such
* decoders would then just decode the first frame.
*
*
* @param avctx the codec context
* @param[out] picture The AVFrame in which the decoded video frame will be stored.
+ * Use avcodec_alloc_frame to get an AVFrame, the codec will
+ * allocate memory for the actual bitmap.
+ * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
+ * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
+ * decodes and the decoder tells the user once it does not need the data anymore,
+ * the user app can at this point free/reuse/keep the memory as it sees fit.
+ *
* @param[in] avpkt The input AVpacket containing the input buffer.
* You can create such packet with av_init_packet() and by then setting
* data and size, some decoders might in addition need other fields like
- * flags&PKT_FLAG_KEY. All decoders are designed to use the least
+ * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
* fields possible.
* @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
* @return On error a negative value is returned, otherwise the number of bytes
#endif
/**
- * Decodes a subtitle message.
- * Returns a negative value on error, otherwise returns the number of bytes used.
+ * Decode a subtitle message.
+ * Return a negative value on error, otherwise return the number of bytes used.
* If no subtitle could be decompressed, got_sub_ptr is zero.
* Otherwise, the subtitle is stored in *sub.
*
uint8_t *buf, int buf_size);
/**
- * Encodes an audio frame from samples into buf.
+ * Encode an audio frame from samples into buf.
*
* @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
* However, for PCM audio the user will know how much space is needed
const short *samples);
/**
- * Encodes a video frame from pict into buf.
+ * Encode a video frame from pict into buf.
* The input picture should be
* stored using a specific format, namely avctx.pix_fmt.
*
/* misc useful functions */
/**
- * Returns a single letter to describe the given picture type pict_type.
+ * Return a single letter to describe the given picture type pict_type.
*
* @param[in] pict_type the picture type
* @return A single character representing the picture type.
char av_get_pict_type_char(int pict_type);
/**
- * Returns codec bits per sample.
+ * Return codec bits per sample.
*
* @param[in] codec_id the codec
* @return Number of bits per sample or zero if unknown for the given codec.
int av_get_bits_per_sample(enum CodecID codec_id);
/**
- * Returns sample format bits per sample.
+ * Return sample format bits per sample.
*
* @param[in] sample_fmt the sample format
* @return Number of bits per sample or zero if unknown for the given sample format.
int flags;
#define PARSER_FLAG_COMPLETE_FRAMES 0x0001
+#define PARSER_FLAG_ONCE 0x0002
int64_t offset; ///< byte offset from starting packet start
int64_t cur_frame_end[AV_PARSER_PTS_NB];
/* memory */
/**
- * Reallocates the given block if it is not large enough, otherwise it
- * does nothing.
+ * Reallocate the given block if it is not large enough, otherwise do nothing.
*
* @see av_realloc
*/
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
/**
- * Allocates a buffer, reusing the given one if large enough.
+ * Allocate a buffer, reusing the given one if large enough.
*
* Contrary to av_fast_realloc the current buffer contents might not be
* preserved and on error the old buffer is freed, thus no special
int padtop, int padbottom, int padleft, int padright, int *color);
/**
- * Encodes extradata length to a buffer. Used by xiph codecs.
+ * Encode extradata length to a buffer. Used by xiph codecs.
*
* @param s buffer to write to; must be at least (v/255+1) bytes long
* @param v size of extradata in bytes
unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
/**
- * Parses str and put in width_ptr and height_ptr the detected values.
+ * Parse str and put in width_ptr and height_ptr the detected values.
*
* @return 0 in case of a successful parsing, a negative value otherwise
* @param[in] str the string to parse: it has to be a string in the format
int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
/**
- * Parses str and put in frame_rate the detected values.
+ * Parse str and store the detected values in *frame_rate.
*
* @return 0 in case of a successful parsing, a negative value otherwise
* @param[in] str the string to parse: it has to be a string in the format
void av_log_missing_feature(void *avc, const char *feature, int want_sample);
/**
- * Logs a generic warning message asking for a sample. This function is
+ * Log a generic warning message asking for a sample. This function is
* intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
* only, and would normally not be used by applications.
* @param[in] avc a pointer to an arbitrary struct of which the first field is
void av_log_ask_for_sample(void *avc, const char *msg);
/**
- * Registers the hardware accelerator hwaccel.
+ * Register the hardware accelerator hwaccel.
*/
void av_register_hwaccel(AVHWAccel *hwaccel);
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