#include <stdint.h>#include "libavutil/libm.h"#include "libavutil/samplefmt.h"#include "avresample.h"#include "internal.h"#include "audio_data.h"#include "audio_mix.h"Go to the source code of this file.
Defines | |
| #define | MIX_FUNC_NAME(fmt, cfmt) mix_any_ ## fmt ##_## cfmt ##_c |
| #define | MIX_FUNC_GENERIC(fmt, cfmt, stype, ctype, sumtype, expr) |
Functions | |
| void | ff_audio_mix_set_func (AudioMix *am, enum AVSampleFormat fmt, enum AVMixCoeffType coeff_type, int in_channels, int out_channels, int ptr_align, int samples_align, const char *descr, void *mix_func) |
| Set mixing function if the parameters match. | |
| MIX_FUNC_GENERIC (MIX_FUNC_GENERIC(S16P, FLT, MIX_FUNC_GENERIC(int16_t, float, float, av_clip_int16(lrintf(sum))) | |
| static void | mix_1_to_2_fltp_flt_c (float **samples, float **matrix, int len, int out_ch, int in_ch) |
| static void | mix_6_to_2_fltp_flt_c (float **samples, float **matrix, int len, int out_ch, int in_ch) |
| static void | mix_2_to_6_fltp_flt_c (float **samples, float **matrix, int len, int out_ch, int in_ch) |
| static int | mix_function_init (AudioMix *am) |
| int | ff_audio_mix_init (AVAudioResampleContext *avr) |
| Initialize the AudioMix context in the AVAudioResampleContext. | |
| void | ff_audio_mix_close (AudioMix *am) |
| Close an AudioMix context. | |
| int | ff_audio_mix (AudioMix *am, AudioData *src) |
| Apply channel mixing to audio data using the current mixing matrix. | |
Variables | |
| static const char * | coeff_type_names [] = { "q8", "q15", "flt" } |
| #define MIX_FUNC_GENERIC | ( | fmt, | |||
| cfmt, | |||||
| stype, | |||||
| ctype, | |||||
| sumtype, | |||||
| expr | ) |
Value:
static void MIX_FUNC_NAME(fmt, cfmt)(stype **samples, ctype **matrix, \ int len, int out_ch, int in_ch) \ { \ int i, in, out; \ stype temp[AVRESAMPLE_MAX_CHANNELS]; \ for (i = 0; i < len; i++) { \ for (out = 0; out < out_ch; out++) { \ sumtype sum = 0; \ for (in = 0; in < in_ch; in++) \ sum += samples[in][i] * matrix[out][in]; \ temp[out] = expr; \ } \ for (out = 0; out < out_ch; out++) \ samples[out][i] = temp[out]; \ } \ }
Definition at line 71 of file audio_mix.c.
Apply channel mixing to audio data using the current mixing matrix.
Definition at line 328 of file audio_mix.c.
Referenced by avresample_convert().
| void ff_audio_mix_close | ( | AudioMix * | am | ) |
Close an AudioMix context.
This clears and frees the mixing matrix arrays.
Definition at line 315 of file audio_mix.c.
Referenced by avresample_close().
| int ff_audio_mix_init | ( | AVAudioResampleContext * | avr | ) |
Initialize the AudioMix context in the AVAudioResampleContext.
The parameters in the AVAudioResampleContext are used to initialize the AudioMix context and set the mixing matrix.
| avr | AVAudioResampleContext |
Definition at line 254 of file audio_mix.c.
Referenced by avresample_open().
| void ff_audio_mix_set_func | ( | AudioMix * | am, | |
| enum AVSampleFormat | fmt, | |||
| enum AVMixCoeffType | coeff_type, | |||
| int | in_channels, | |||
| int | out_channels, | |||
| int | ptr_align, | |||
| int | samples_align, | |||
| const char * | descr, | |||
| void * | mix_func | |||
| ) |
Set mixing function if the parameters match.
This compares the parameters of the mixing function to the parameters in the AudioMix context. If the parameters do not match, no changes are made to the active functions. If the parameters do match and the alignment is not constrained, the function is set as the generic mixing function. If the parameters match and the alignment is constrained, the function is set as the optimized mixing function.
| am | AudioMix context | |
| fmt | input/output sample format | |
| coeff_type | mixing coefficient type | |
| in_channels | number of input channels, or 0 for any number of channels | |
| out_channels | number of output channels, or 0 for any number of channels | |
| ptr_align | buffer pointer alignment, in bytes | |
| sample_align | buffer size alignment, in samples | |
| descr | function type description (e.g. "C" or "SSE") | |
| mix_func | mixing function pointer |
Definition at line 32 of file audio_mix.c.
Referenced by ff_audio_mix_init_x86(), and mix_function_init().
| static void mix_1_to_2_fltp_flt_c | ( | float ** | samples, | |
| float ** | matrix, | |||
| int | len, | |||
| int | out_ch, | |||
| int | in_ch | |||
| ) | [static] |
| static void mix_2_to_6_fltp_flt_c | ( | float ** | samples, | |
| float ** | matrix, | |||
| int | len, | |||
| int | out_ch, | |||
| int | in_ch | |||
| ) | [static] |
| static void mix_6_to_2_fltp_flt_c | ( | float ** | samples, | |
| float ** | matrix, | |||
| int | len, | |||
| int | out_ch, | |||
| int | in_ch | |||
| ) | [static] |
| MIX_FUNC_GENERIC | ( | MIX_FUNC_GENERIC( | S16P, | |
| FLT | , | |||
| MIX_FUNC_GENERIC( | int16_t, | |||
| float | , | |||
| float | , | |||
| av_clip_int16(lrintf(sum)) | ||||
| ) |
Definition at line 90 of file audio_mix.c.
| static int mix_function_init | ( | AudioMix * | am | ) | [static] |
const char* coeff_type_names[] = { "q8", "q15", "flt" } [static] |
Definition at line 30 of file audio_mix.c.
Referenced by ff_audio_mix_set_func(), and mix_function_init().
1.5.8