#include "swresample.h"
typedef struct AudioData{
- uint8_t *ch[SWR_CH_MAX];
- uint8_t *data;
- int ch_count;
- int bps;
- int count;
- int planar;
+ uint8_t *ch[SWR_CH_MAX]; ///< samples buffer per channel
+ uint8_t *data; ///< samples buffer
+ int ch_count; ///< number of channels
+ int bps; ///< bytes per sample
+ int count; ///< number of samples
+ int planar; ///< 1 if planar audio, 0 otherwise
} AudioData;
-typedef struct SwrContext { //FIXME find unused fields
- AVClass *av_class;
- int log_level_offset;
- void *log_ctx;
- enum AVSampleFormat in_sample_fmt;
- enum AVSampleFormat int_sample_fmt; ///<AV_SAMPLE_FMT_FLT OR AV_SAMPLE_FMT_S16
- enum AVSampleFormat out_sample_fmt;
- int64_t in_ch_layout;
- int64_t out_ch_layout;
- int in_sample_rate;
- int out_sample_rate;
- int flags;
- float slev, clev;
+typedef struct SwrContext {
+ const AVClass *av_class; ///< AVClass used for AVOption and av_log()
+ int log_level_offset; ///< logging level offset
+ void *log_ctx; ///< parent logging context
+ enum AVSampleFormat in_sample_fmt; ///< input sample format
+ enum AVSampleFormat int_sample_fmt; ///< internal sample format (AV_SAMPLE_FMT_FLT or AV_SAMPLE_FMT_S16)
+ enum AVSampleFormat out_sample_fmt; ///< output sample format
+ int64_t in_ch_layout; ///< input channel layout
+ int64_t out_ch_layout; ///< output channel layout
+ int in_sample_rate; ///< input sample rate
+ int out_sample_rate; ///< output sample rate
+ int flags; ///< miscellaneous flags such as SWR_FLAG_RESAMPLE
+ float slev; ///< surround mixing level
+ float clev; ///< center mixing level
+ float rematrix_volume; ///< rematrixing volume coefficient
+ const int *channel_map; ///< channel index (or -1 if muted channel) map
+ int used_ch_count; ///< number of used input channels (mapped channel count if channel_map, otherwise in.ch_count)
- //below are private
- int int_bps;
- int resample_first;
- int rematrix; ///< flag to indicate if rematrixing is used
+ int int_bps; ///< internal bytes per sample
+ int resample_first; ///< 1 if resampling must come first, 0 if rematrixing
+ int rematrix; ///< flag to indicate if rematrixing is needed (basically if input and output layouts mismatch)
- AudioData in, postin, midbuf, preout, out, in_buffer;
- int in_buffer_index;
- int in_buffer_count;
- int resample_in_constraint;
+ AudioData in; ///< input audio data
+ AudioData postin; ///< post-input audio data: used for rematrix/resample
+ AudioData midbuf; ///< intermediate audio data (postin/preout)
+ AudioData preout; ///< pre-output audio data: used for rematrix/resample
+ AudioData out; ///< converted output audio data
+ AudioData in_buffer; ///< cached audio data (convert and resample purpose)
+ int in_buffer_index; ///< cached buffer position
+ int in_buffer_count; ///< cached buffer length
+ int resample_in_constraint; ///< 1 if the input end was reach before the output end, 0 otherwise
- struct AVAudioConvert *in_convert;
- struct AVAudioConvert *out_convert;
- struct AVResampleContext *resample;
+ struct AudioConvert *in_convert; ///< input conversion context
+ struct AudioConvert *out_convert; ///< output conversion context
+ struct AudioConvert *full_convert; ///< full conversion context (single conversion for input and output)
+ struct ResampleContext *resample; ///< resampling context
- float matrix[SWR_CH_MAX][SWR_CH_MAX];
- int16_t matrix16[SWR_CH_MAX][SWR_CH_MAX];
- uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1];
+ float matrix[SWR_CH_MAX][SWR_CH_MAX]; ///< floating point rematrixing coefficients
+ int32_t matrix32[SWR_CH_MAX][SWR_CH_MAX]; ///< 17.15 fixed point rematrixing coefficients
+ uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1]; ///< Lists of input channels per output channel that have non zero rematrixing coefficients
- //TODO callbacks for asm optims
+ /* TODO: callbacks for ASM optimizations */
}SwrContext;
-struct AVResampleContext *swr_resample_init(struct AVResampleContext *, int out_rate, int in_rate, int filter_size, int phase_shift, int linear, double cutoff);
-void swr_resample_free(struct AVResampleContext **c);
-int swr_multiple_resample(struct AVResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed);
-void swr_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
-int swr_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
+struct ResampleContext *swri_resample_init(struct ResampleContext *, int out_rate, int in_rate, int filter_size, int phase_shift, int linear, double cutoff);
+void swri_resample_free(struct ResampleContext **c);
+int swri_multiple_resample(struct ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed);
+void swri_resample_compensate(struct ResampleContext *c, int sample_delta, int compensation_distance);
+int swri_resample(struct ResampleContext *c, int16_t *dst, const int16_t *src, int *consumed, int src_size, int dst_size, int update_ctx);
+
+int swri_rematrix_init(SwrContext *s);
+int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy);
-int swr_rematrix_init(SwrContext *s);
-int swr_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy);
#endif
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