mirror of https://git.ffmpeg.org/ffmpeg.git
swresample: misc. doxy improvements
Signed-off-by: Timothy Gu <timothygu99@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Timothy Gu
Michael Niedermayer
parent
9ccc7aeeea
commit
5b58692ed4
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@ -189,6 +189,7 @@ typedef struct SwrContext SwrContext;
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* AV_OPT_SEARCH_FAKE_OBJ for examining options.
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*
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* @see av_opt_find().
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* @return the AVClass of SwrContext
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*/
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const AVClass *swr_get_class(void);
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@ -211,6 +212,7 @@ struct SwrContext *swr_alloc(void);
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/**
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* Initialize context after user parameters have been set.
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*
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* @param[in,out] s Swr context to initialize
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* @return AVERROR error code in case of failure.
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*/
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int swr_init(struct SwrContext *s);
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@ -218,6 +220,8 @@ int swr_init(struct SwrContext *s);
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/**
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* Check whether an swr context has been initialized or not.
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*
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* @param[in] s Swr context to check
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* @see swr_init()
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* @return positive if it has been initialized, 0 if not initialized
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*/
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int swr_is_initialized(struct SwrContext *s);
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@ -229,7 +233,7 @@ int swr_is_initialized(struct SwrContext *s);
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* other hand, swr_alloc() can use swr_alloc_set_opts() to set the parameters
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* on the allocated context.
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*
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* @param s Swr context, can be NULL
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* @param s existing Swr context if available, or NULL if not
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* @param out_ch_layout output channel layout (AV_CH_LAYOUT_*)
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* @param out_sample_fmt output sample format (AV_SAMPLE_FMT_*).
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* @param out_sample_rate output sample rate (frequency in Hz)
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@ -256,6 +260,8 @@ struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
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/**
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* Free the given SwrContext and set the pointer to NULL.
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*
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* @param[in] s a pointer to a pointer to Swr context
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*/
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void swr_free(struct SwrContext **s);
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@ -266,6 +272,8 @@ void swr_free(struct SwrContext **s);
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* swr_init() can also be used without swr_close().
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* This function is mainly provided for simplifying the usecase
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* where one tries to support libavresample and libswresample.
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*
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* @param[in,out] s Swr context to be closed
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*/
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void swr_close(struct SwrContext *s);
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@ -301,12 +309,16 @@ int swr_convert(struct SwrContext *s, uint8_t **out, int out_count,
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* timestamps are in 1/(in_sample_rate * out_sample_rate) units.
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*
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* @note There are 2 slightly differently behaving modes.
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* First is when automatic timestamp compensation is not used, (min_compensation >= FLT_MAX)
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* @li When automatic timestamp compensation is not used, (min_compensation >= FLT_MAX)
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* in this case timestamps will be passed through with delays compensated
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* Second is when automatic timestamp compensation is used, (min_compensation < FLT_MAX)
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* in this case the output timestamps will match output sample numbers
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* @li When automatic timestamp compensation is used, (min_compensation < FLT_MAX)
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* in this case the output timestamps will match output sample numbers.
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* See ffmpeg-resampler(1) for the two modes of compensation.
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*
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* @param pts timestamp for the next input sample, INT64_MIN if unknown
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* @param s[in] initialized Swr context
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* @param pts[in] timestamp for the next input sample, INT64_MIN if unknown
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* @see swr_set_compensation(), swr_drop_output(), and swr_inject_silence() are
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* function used internally for timestamp compensation.
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* @return the output timestamp for the next output sample
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*/
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int64_t swr_next_pts(struct SwrContext *s, int64_t pts);
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@ -321,17 +333,30 @@ int64_t swr_next_pts(struct SwrContext *s, int64_t pts);
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*/
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/**
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* Activate resampling compensation.
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* Activate resampling compensation ("soft" compensation). This function is
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* internally called when needed in swr_next_pts().
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*
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* @param[in,out] s allocated Swr context. If it is not initialized,
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* or SWR_FLAG_RESAMPLE is not set, swr_init() is
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* called with the flag set.
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* @param[in] sample_delta delta in PTS per sample
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* @param[in] compensation_distance number of samples to compensate for
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* @return >= 0 on success, AVERROR error codes if:
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* @li @c s is NULL,
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* @li @c compensation_distance is less than 0,
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* @li @c compensation_distance is 0 but sample_delta is not,
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* @li compensation unsupported by resampler, or
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* @li swr_init() fails when called.
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*/
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int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance);
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/**
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* Set a customized input channel mapping.
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*
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* @param s allocated Swr context, not yet initialized
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* @param channel_map customized input channel mapping (array of channel
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* @param[in,out] s allocated Swr context, not yet initialized
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* @param[in] channel_map customized input channel mapping (array of channel
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* indexes, -1 for a muted channel)
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* @return AVERROR error code in case of failure.
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* @return >= 0 on success, or AVERROR error code in case of failure.
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*/
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int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map);
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@ -342,7 +367,7 @@ int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map);
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* @param matrix remix coefficients; matrix[i + stride * o] is
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* the weight of input channel i in output channel o
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* @param stride offset between lines of the matrix
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* @return AVERROR error code in case of failure.
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* @return >= 0 on success, or AVERROR error code in case of failure.
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*/
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int swr_set_matrix(struct SwrContext *s, const double *matrix, int stride);
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@ -355,11 +380,27 @@ int swr_set_matrix(struct SwrContext *s, const double *matrix, int stride);
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/**
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* Drops the specified number of output samples.
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*
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* This function, along with swr_inject_silence(), is called by swr_next_pts()
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* if needed for "hard" compensation.
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*
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* @param s allocated Swr context
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* @param count number of samples to be dropped
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*
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* @return >= 0 on success, or a negative AVERROR code on failure
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*/
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int swr_drop_output(struct SwrContext *s, int count);
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/**
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* Injects the specified number of silence samples.
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*
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* This function, along with swr_drop_output(), is called by swr_next_pts()
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* if needed for "hard" compensation.
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*
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* @param s allocated Swr context
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* @param count number of samples to be dropped
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*
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* @return >= 0 on success, or a negative AVERROR code on failure
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*/
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int swr_inject_silence(struct SwrContext *s, int count);
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@ -375,13 +416,17 @@ int swr_inject_silence(struct SwrContext *s, int count);
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* for upsampling and the input sample rate.
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*
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* @param s swr context
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* @param base timebase in which the returned delay will be
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* if its set to 1 the returned delay is in seconds
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* if its set to 1000 the returned delay is in milli seconds
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* if its set to the input sample rate then the returned delay is in input samples
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* if its set to the output sample rate then the returned delay is in output samples
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* an exact rounding free delay can be found by using LCM(in_sample_rate, out_sample_rate)
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* @returns the delay in 1/base units.
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* @param base timebase in which the returned delay will be:
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* @li if it's set to 1 the returned delay is in seconds
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* @li if it's set to 1000 the returned delay is in milliseconds
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* @li if it's set to the input sample rate then the returned
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* delay is in input samples
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* @li if it's set to the output sample rate then the returned
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* delay is in output samples
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* @li if it's the least common multiple of in_sample_rate and
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* out_sample_rate then an exact rounding-free delay will be
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* returned
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* @returns the delay in 1 / @c base units.
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*/
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int64_t swr_get_delay(struct SwrContext *s, int64_t base);
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