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authorMichael Niedermayer <michaelni@gmx.at>2012-10-30 14:40:22 +0100
committerMichael Niedermayer <michaelni@gmx.at>2012-10-30 14:40:22 +0100
commite79c3858b35fcc77c68c33b627958e736686957e (patch)
tree5f933517c2909def4e2930a409b0a460eb4f41fd /libavresample
parentcd37963684d8ee9819af15ccebe09d84839101dd (diff)
parent14f031d7ecfabba0ef02776d4516aa3dcb7c40d8 (diff)
downloadffmpeg-e79c3858b35fcc77c68c33b627958e736686957e.tar.gz
Merge commit '14f031d7ecfabba0ef02776d4516aa3dcb7c40d8'
* commit '14f031d7ecfabba0ef02776d4516aa3dcb7c40d8': dv: use AVStream.index instead of abusing AVStream.id lavfi: add ashowinfo filter avcodec: Add a RFC 3389 comfort noise codec lpc: Add a function for calculating reflection coefficients from samples lpc: Add a function for calculating reflection coefficients from autocorrelation coefficients lavr: document upper bound on number of output samples. lavr: add general API usage doxy indeo3: remove duplicate capabilities line. fate: ac3: Add dependencies Conflicts: Changelog doc/filters.texi libavcodec/Makefile libavcodec/allcodecs.c libavcodec/avcodec.h libavcodec/codec_desc.c libavcodec/version.h libavfilter/Makefile libavfilter/af_ashowinfo.c libavfilter/allfilters.c libavfilter/version.h libavutil/avutil.h Merged-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavresample')
-rw-r--r--libavresample/avresample.h75
1 files changed, 75 insertions, 0 deletions
diff --git a/libavresample/avresample.h b/libavresample/avresample.h
index ea93952e2e..b0a9e247e8 100644
--- a/libavresample/avresample.h
+++ b/libavresample/avresample.h
@@ -23,9 +23,76 @@
/**
* @file
+ * @ingroup lavr
* external API header
*/
+/**
+ * @defgroup lavr Libavresample
+ * @{
+ *
+ * Libavresample (lavr) is a library that handles audio resampling, sample
+ * format conversion and mixing.
+ *
+ * Interaction with lavr is done through AVAudioResampleContext, which is
+ * allocated with avresample_alloc_context(). It is opaque, so all parameters
+ * must be set with the @ref avoptions API.
+ *
+ * For example the following code will setup conversion from planar float sample
+ * format to interleaved signed 16-bit integer, downsampling from 48kHz to
+ * 44.1kHz and downmixing from 5.1 channels to stereo (using the default mixing
+ * matrix):
+ * @code
+ * AVAudioResampleContext *avr = avresample_alloc_context();
+ * av_opt_set_int(avr, "in_channel_layout", AV_CH_LAYOUT_5POINT1, 0);
+ * av_opt_set_int(avr, "out_channel_layout", AV_CH_LAYOUT_STEREO, 0);
+ * av_opt_set_int(avr, "in_sample_rate", 48000, 0);
+ * av_opt_set_int(avr, "out_sample_rate", 44100, 0);
+ * av_opt_set_int(avr, "in_sample_fmt", AV_SAMPLE_FMT_FLTP, 0);
+ * av_opt_set_int(avr, "out_sample_fmt, AV_SAMPLE_FMT_S16, 0);
+ * @endcode
+ *
+ * Once the context is initialized, it must be opened with avresample_open(). If
+ * you need to change the conversion parameters, you must close the context with
+ * avresample_close(), change the parameters as described above, then reopen it
+ * again.
+ *
+ * The conversion itself is done by repeatedly calling avresample_convert().
+ * Note that the samples may get buffered in two places in lavr. The first one
+ * is the output FIFO, where the samples end up if the output buffer is not
+ * large enough. The data stored in there may be retrieved at any time with
+ * avresample_read(). The second place is the resampling delay buffer,
+ * applicable only when resampling is done. The samples in it require more input
+ * before they can be processed. Their current amount is returned by
+ * avresample_get_delay(). At the end of conversion the resampling buffer can be
+ * flushed by calling avresample_convert() with NULL input.
+ *
+ * The following code demonstrates the conversion loop assuming the parameters
+ * from above and caller-defined functions get_input() and handle_output():
+ * @code
+ * uint8_t **input;
+ * int in_linesize, in_samples;
+ *
+ * while (get_input(&input, &in_linesize, &in_samples)) {
+ * uint8_t *output
+ * int out_linesize;
+ * int out_samples = avresample_available(avr) +
+ * av_rescale_rnd(avresample_get_delay(avr) +
+ * in_samples, 44100, 48000, AV_ROUND_UP);
+ * av_samples_alloc(&output, &out_linesize, 2, out_samples,
+ * AV_SAMPLE_FMT_S16, 0);
+ * out_samples = avresample_convert(avr, &output, out_linesize, out_samples,
+ * input, in_linesize, in_samples);
+ * handle_output(output, out_linesize, out_samples);
+ * av_freep(&output);
+ * }
+ * @endcode
+ *
+ * When the conversion is finished and the FIFOs are flushed if required, the
+ * conversion context and everything associated with it must be freed with
+ * avresample_free().
+ */
+
#include "libavutil/audioconvert.h"
#include "libavutil/avutil.h"
#include "libavutil/dict.h"
@@ -198,6 +265,10 @@ int avresample_set_compensation(AVAudioResampleContext *avr, int sample_delta,
/**
* Convert input samples and write them to the output FIFO.
*
+ * The upper bound on the number of output samples is given by
+ * avresample_available() + (avresample_get_delay() + number of input samples) *
+ * output sample rate / input sample rate.
+ *
* The output data can be NULL or have fewer allocated samples than required.
* In this case, any remaining samples not written to the output will be added
* to an internal FIFO buffer, to be returned at the next call to this function
@@ -289,4 +360,8 @@ int avresample_available(AVAudioResampleContext *avr);
*/
int avresample_read(AVAudioResampleContext *avr, uint8_t **output, int nb_samples);
+/**
+ * @}
+ */
+
#endif /* AVRESAMPLE_AVRESAMPLE_H */