// // Created by frank on 2021/8/16. // #include "execute_fft.h" #include #define LOG_TAG "execute_fft" #define LOGE(...) ((void)__android_log_print(ANDROID_LOG_ERROR, LOG_TAG, \ __VA_ARGS__)) #define SPECTRUM_WIDTH 4.f #define NB_BANDS 20 #define ROTATION_INCREMENT .1f #define BAR_DECREMENT .075f #define ROTATION_MAX 20 /*static*/ int open_visualizer(filter_sys_t *p_sys) { if (p_sys == NULL) return VLC_ENOMEM; /* Create the object for the thread */ p_sys->i_channels = 1; p_sys->i_prev_nb_samples = 0; p_sys->p_prev_s16_buff = NULL; p_sys->f_rotationAngle = 0; p_sys->f_rotationIncrement = ROTATION_INCREMENT; window_param *w_param = (window_param*) malloc(sizeof(window_param)); p_sys->wind_param = *w_param;//TODO /* Fetch the FFT window parameters */ window_get_param(&p_sys->wind_param); /* Create the FIFO for the audio data. */ vlc_queue_t *queue = vlc_queue_init(5); p_sys->queue = *queue; p_sys->dead = false; pthread_create (&p_sys->thread, NULL, fft_thread, p_sys); return VLC_SUCCESS; } /*static*/ block_t *filter_audio(filter_sys_t *p_sys, block_t *p_in_buf) { vlc_queue_push(&p_sys->queue, p_in_buf); return p_in_buf; } /*static*/ void close_visualizer(filter_sys_t *p_filter) { filter_sys_t *p_sys = p_filter; /* Terminate the thread. */ vlc_queue_free(&p_sys->queue); pthread_join(p_sys->thread, NULL); free(p_sys->p_prev_s16_buff); } static void *fft_thread(void *p_data) { filter_sys_t *p_sys = (filter_sys_t*)p_data; block_t *block; float height[NB_BANDS] = {0}; LOGE("start FFT thread..."); while ((block = vlc_queue_pop(&p_sys->queue))) { LOGE("running FFT transform..."); /* Horizontal scale for 20-band equalizer */ const unsigned xscale[] = {0,1,2,3,4,5,6,7,8,11,15,20,27, 36,47,62,82,107,141,184,255}; fft_state *p_state = NULL; /* internal FFT data */ DEFINE_WIND_CONTEXT(wind_ctx); /* internal window data */ unsigned i, j; float p_output[FFT_BUFFER_SIZE]; /* Raw FFT Result */ int16_t p_buffer1[FFT_BUFFER_SIZE]; /* Buffer on which we perform the FFT (first channel) */ int16_t p_dest[FFT_BUFFER_SIZE]; /* Adapted FFT result */ float *p_buffl = (float*)block->p_buffer; /* Original buffer */ int16_t *p_buffs; /* int16_t converted buffer */ int16_t *p_s16_buff; /* int16_t converted buffer */ if (!block->i_nb_samples) { LOGE("no samples yet..."); goto release; } /* Allocate the buffer only if the number of samples change */ if (block->i_nb_samples != p_sys->i_prev_nb_samples) { free(p_sys->p_prev_s16_buff); p_sys->p_prev_s16_buff = malloc(block->i_nb_samples * p_sys->i_channels * sizeof(int16_t)); if (!p_sys->p_prev_s16_buff) goto release; p_sys->i_prev_nb_samples = block->i_nb_samples; } p_buffs = p_s16_buff = p_sys->p_prev_s16_buff; /* Convert the buffer to int16_t */ for (i = block->i_nb_samples * p_sys->i_channels; i--;) { union {float f; int32_t i;} u; u.f = *p_buffl + 384.f; if (u.i > 0x43c07fff) *p_buffs = 32767; else if (u.i < 0x43bf8000) *p_buffs = -32768; else *p_buffs = u.i - 0x43c00000; p_buffl++; p_buffs++; } p_state = visual_fft_init(); if (!p_state) { LOGE("unable to initialize FFT transform..."); goto release; } if (!window_init(FFT_BUFFER_SIZE, &p_sys->wind_param, &wind_ctx)) { LOGE("unable to initialize FFT window..."); goto release; } p_buffs = p_s16_buff; for (i = 0 ; i < FFT_BUFFER_SIZE; i++) { p_output[i] = 0; p_buffer1[i] = *p_buffs; p_buffs += p_sys->i_channels; if (p_buffs >= &p_s16_buff[block->i_nb_samples * p_sys->i_channels]) p_buffs = p_s16_buff; } window_scale_in_place (p_buffer1, &wind_ctx); fft_perform (p_buffer1, p_output, p_state); for (i = 0; i< FFT_BUFFER_SIZE; ++i) p_dest[i] = p_output[i] * (2 ^ 16) / ((FFT_BUFFER_SIZE / 2 * 32768) ^ 2); for (i = 0 ; i < NB_BANDS; i++) { /* Decrease the previous size of the bar. */ height[i] -= BAR_DECREMENT; if (height[i] < 0) height[i] = 0; int y = 0; /* We search the maximum on one scale to determine the current size of the bar. */ for (j = xscale[i]; j < xscale[i + 1]; j++) { if (p_dest[j] > y) y = p_dest[j]; } /* Calculate the height of the bar */ float new_height = y != 0 ? logf(y) * 0.4f : 0; height[i] = new_height > height[i] ? new_height : height[i]; } /* Determine the camera rotation angle. */ p_sys->f_rotationAngle += p_sys->f_rotationIncrement; if (p_sys->f_rotationAngle <= -ROTATION_MAX) p_sys->f_rotationIncrement = ROTATION_INCREMENT; else if (p_sys->f_rotationAngle >= ROTATION_MAX) p_sys->f_rotationIncrement = -ROTATION_INCREMENT; /* Render the frame. */ // glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // glPushMatrix(); // glRotatef(p_sys->f_rotationAngle, 0, 1, 0); // drawBars(height); // glPopMatrix(); /* Wait to swapp the frame on time. */ // vlc_tick_wait(block->i_pts + (block->i_length / 2)); // vlc_gl_Swap(gl); usleep(10*1000 /*block->i_pts + (block->i_length / 2)*/); block->fft_callback.callback(height); release: window_close(&wind_ctx); fft_close(p_state); } return NULL; }