audio to spectrum (video) transmedia filter, based on ffplay rdft showmode (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini). More...

#include <math.h>
#include "libavcodec/avfft.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"

Data Structures
struct	ShowSpectrumContext

Macros
#define	OFFSET(x) offsetof(ShowSpectrumContext, x)

#define	FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM

#define	RE(y, ch) s->rdft_data[ch][2 * (y) + 0]

#define	IM(y, ch) s->rdft_data[ch][2 * (y) + 1]

#define	MAGNITUDE(y, ch) hypot(RE(y, ch), IM(y, ch))

Enumerations
enum	DisplayMode { COMBINED, SEPARATE, NB_MODES }

enum	DisplayScale { LINEAR, SQRT, CBRT, LOG, NB_SCALES }

enum	ColorMode { CHANNEL, INTENSITY, NB_CLMODES, COLOR_MODE_NONE = -1, COLOR_MODE_BT709, COLOR_MODE_FCC, COLOR_MODE_BT601, COLOR_MODE_SMPTE240M, COLOR_MODE_COUNT }

enum	WindowFunc { WFUNC_NONE, WFUNC_HANN, WFUNC_HAMMING, WFUNC_BLACKMAN, NB_WFUNC }

enum	SlideMode { REPLACE, SCROLL, FULLFRAME, NB_SLIDES }

Functions
	AVFILTER_DEFINE_CLASS (showspectrum)

static av_cold void	uninit (AVFilterContext *ctx)

static int	query_formats (AVFilterContext *ctx)

static int	config_output (AVFilterLink *outlink)

static int	request_frame (AVFilterLink *outlink)

static int	plot_spectrum_column (AVFilterLink inlink, AVFrame insamples)

static int	filter_frame (AVFilterLink inlink, AVFrame insamples)

Variables
static const AVOption	showspectrum_options []

struct {
float a

float y

float u

float v

}	intensity_color_table []

static const AVFilterPad	showspectrum_inputs []

static const AVFilterPad	showspectrum_outputs []

AVFilter	ff_avf_showspectrum

Detailed Description

audio to spectrum (video) transmedia filter, based on ffplay rdft showmode (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini).

Definition in file avf_showspectrum.c.

Macro Definition Documentation

#define OFFSET ( x ) offsetof(ShowSpectrumContext, x)

Definition at line 64 of file avf_showspectrum.c.

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 65 of file avf_showspectrum.c.

#define RE	(	y,
		ch
	)	s->rdft_data[ch][2 * (y) + 0]

#define IM	(	y,
		ch
	)	s->rdft_data[ch][2 * (y) + 1]

#define MAGNITUDE	(	y,
		ch
	)	hypot(RE(y, ch), IM(y, ch))

Referenced by plot_spectrum_column().

Enumeration Type Documentation

enum DisplayMode

Enumerator
COMBINED
SEPARATE
NB_MODES

Definition at line 37 of file avf_showspectrum.c.

enum DisplayScale

Enumerator
LINEAR
SQRT
CBRT
LOG
NB_SCALES

Definition at line 38 of file avf_showspectrum.c.

enum ColorMode

Enumerator
CHANNEL
INTENSITY
NB_CLMODES
COLOR_MODE_NONE
COLOR_MODE_BT709
COLOR_MODE_FCC
COLOR_MODE_BT601
COLOR_MODE_SMPTE240M
COLOR_MODE_COUNT

Definition at line 39 of file avf_showspectrum.c.

enum WindowFunc

Enumerator
WFUNC_NONE
WFUNC_HANN
WFUNC_HAMMING
WFUNC_BLACKMAN
NB_WFUNC

Definition at line 40 of file avf_showspectrum.c.

enum SlideMode

Enumerator
REPLACE
SCROLL
FULLFRAME
NB_SLIDES

Definition at line 41 of file avf_showspectrum.c.

Function Documentation

AVFILTER_DEFINE_CLASS ( showspectrum )

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 108 of file avf_showspectrum.c.

static int query_formats ( AVFilterContext * ctx )

static

Definition at line 122 of file avf_showspectrum.c.

static int config_output ( AVFilterLink * outlink )

static

Definition at line 156 of file avf_showspectrum.c.

static int request_frame ( AVFilterLink * outlink )

static

Definition at line 271 of file avf_showspectrum.c.

static int plot_spectrum_column	(	AVFilterLink *	inlink,
		AVFrame *	insamples
	)

static

Definition at line 297 of file avf_showspectrum.c.

Referenced by filter_frame().

static int filter_frame	(	AVFilterLink *	inlink,
		AVFrame *	insamples
	)

static

Definition at line 489 of file avf_showspectrum.c.

Variable Documentation

const AVOption showspectrum_options[]

static

Initial value:

= {
    { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS },
    { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS },
    { "slide", "set sliding mode", OFFSET(sliding), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NB_SLIDES, FLAGS, "slide" },
        { "replace", "replace old columns with new", 0, AV_OPT_TYPE_CONST, {.i64=REPLACE}, 0, 0, FLAGS, "slide" },
        { "scroll", "scroll from right to left", 0, AV_OPT_TYPE_CONST, {.i64=SCROLL}, 0, 0, FLAGS, "slide" },
        { "fullframe", "return full frames", 0, AV_OPT_TYPE_CONST, {.i64=FULLFRAME}, 0, 0, FLAGS, "slide" },
    { "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, COMBINED, NB_MODES-1, FLAGS, "mode" },
        { "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },
        { "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },
    { "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=CHANNEL}, CHANNEL, NB_CLMODES-1, FLAGS, "color" },
        { "channel",   "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL},   0, 0, FLAGS, "color" },
        { "intensity", "intensity based coloring",        0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },
    { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=SQRT}, LINEAR, NB_SCALES-1, FLAGS, "scale" },
        { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },
        { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },
        { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },
        { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },
    { "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },
    { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANN}, 0, NB_WFUNC-1, FLAGS, "win_func" },
        { "hann",     "Hann window",     0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HANN},     0, 0, FLAGS, "win_func" },
        { "hamming",  "Hamming window",  0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HAMMING},  0, 0, FLAGS, "win_func" },
        { "blackman", "Blackman window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
    { NULL }
}

Definition at line 67 of file avf_showspectrum.c.

float a

Definition at line 96 of file avf_showspectrum.c.

Referenced by plot_spectrum_column().

float y

Examples:: decoding_encoding.c, filtering_video.c, muxing.c, and scaling_video.c.

Definition at line 96 of file avf_showspectrum.c.

float u

Definition at line 96 of file avf_showspectrum.c.

Referenced by adpcm_compress_trellis(), adpcm_decode_frame(), apply_lut(), avui_decode_frame(), aw_pulse_set2(), blend_subrect(), build_diff_map(), build_huff(), calc_combed_score(), calculate_codes(), cinepak_decode_codebook(), config_input(), cpia_decode_frame(), create_chrominance_lut(), dca_downmix(), decode_frame(), decode_subband_slice_buffered(), dv_decode_ac(), dxt1_decode_pixels(), encode_422_bitstream(), encode_frame(), ff_h264_decode_picture_parameter_set(), ff_print_debug_info2(), ff_rtjpeg_decode_frame_yuv420(), ff_yuv2rgb_c_init_tables(), filter_frame(), frame_block_to_cell(), generate_joint_tables(), get_bits(), get_s16l(), getutime(), hl_decode_mb_predict_luma(), hls_read_header(), init(), intra_predict(), jp2_find_codestream(), lcg_random(), model256_update(), model2_update(), model_update(), motionpixels_tableinit(), mp_build_rgb_yuv_table(), mp_set_zero_yuv(), mp_yuv_to_rgb(), mss2_blit_wmv9_template(), opus_rc_normalize(), plot_cqt(), plot_spectrum_column(), pow_m1_4(), print_option(), process_slice_uyvy422(), process_slice_yuv420p(), process_slice_yuv422p(), resample_cubic(), resample_linear(), reverse_dc_prediction(), rgb16_32ToUV_c_template(), rso_write_header(), rv34_pred_4x4_block(), rv40_weak_loop_filter(), scan_float(), scan_int32(), sign_extend(), subtitle_thread(), svq3_decode_mb(), sws_scale(), tm2_decode_blocks(), uninit_options(), utvideo_decode_frame(), utvideo_encode_frame(), v308_decode_frame(), v308_encode_frame(), v408_decode_frame(), v408_encode_frame(), v410_decode_frame(), v410_encode_frame(), wavpack_encode_block(), wv_get_value_float(), y216_decode_frame(), y41p_decode_frame(), y41p_encode_frame(), yuv2nv12cX_c(), yuv4_decode_frame(), yuv4_encode_frame(), and zero12v_decode_frame().

float v

Examples:: muxing.c.

Definition at line 96 of file avf_showspectrum.c.

Referenced by ac3_extract_exponents_c(), ac3_max_msb_abs_int16_c(), ac3_tables_init(), add_wav(), add_yblock(), adpcm_decode_frame(), adpcm_encode_frame(), apply_channel_coupling(), apply_lut(), audiogen(), av_adler32_update(), av_base64_decode(), av_cmp_i(), av_free(), av_int2sf(), AV_RB16(), AV_RB24(), AV_RB32(), AV_RB64(), AV_RL16(), AV_RL24(), AV_RL32(), AV_RL64(), av_shr_i(), av_tree_enumerate(), av_tree_find(), av_tree_insert(), av_xiphlacing(), avs_array_elt(), avs_new_value_array(), avs_new_value_bool(), avs_new_value_clip(), avs_new_value_error(), avs_new_value_float(), avs_new_value_int(), avs_new_value_string(), avui_decode_frame(), aw_pulse_set1(), bessel(), bink_decode_plane(), binkb_decode_plane(), blend_subrect(), bs_get_v(), build_xlaw_table(), calc_coefficients(), calc_combed_score(), categorize(), check_mv(), choose_rct_params(), cinepak_decode_codebook(), clip_f15(), commit_bitstream_and_slice_buffer(), compute_affinity(), compute_scale_factors(), config_input(), copy_elem(), cpia_decode_frame(), create_chrominance_lut(), create_lut(), dca_downmix(), dca_qmf_32_subbands(), dct_error(), deblocking_filter_CTB(), decode2x2(), decode4x4(), decode8x8(), decode_b(), decode_block(), decode_channel(), decode_dds1(), decode_dsw1(), decode_entropy_coded_image(), decode_exp_vlc(), decode_frame(), decode_init(), decode_init_static(), decode_line(), decode_mb(), decode_mv_component(), decode_mvc1(), decode_mvc2(), decode_rbsp_trailing(), decode_run_2bit(), decode_sgirle8(), decode_slice(), decode_spectrum_and_dequant(), decode_subband_slice_buffered(), decode_subframe(), decode_trns_chunk(), decode_tsw1(), decode_wdlt(), decode_wmv9(), decodeplane8(), decorrelate(), decouple_info(), dequant_lsp10i(), dequant_lsp10r(), dequant_lsp16i(), dequant_lsp16r(), dshow_add_device(), dshow_cycle_formats(), dvb_encode_rle2(), dvb_encode_rle4(), dxva2_vc1_decode_slice(), dxva2_vc1_end_frame(), dxva2_vc1_start_frame(), encode_422_bitstream(), encode_block(), encode_frame(), encode_headers(), encode_line(), encode_picture_ls(), encode_rgb_frame(), encode_subband_c0run(), eval_expr(), evolve(), f_func(), ff_ac3_bit_alloc_calc_psd(), ff_acelp_interpolate(), ff_acelp_interpolatef(), ff_audio_mix_set_matrix(), ff_bgmc_decode(), ff_eac3_decode_transform_coeffs_aht_ch(), ff_gradfun_blur_line_c(), ff_h263_decode_mb(), ff_h263_decode_picture_header(), ff_h264_decode_picture_parameter_set(), ff_hex_to_data(), ff_idet_filter_line_c(), ff_idet_filter_line_c_16bit(), ff_j_rev_dct(), ff_j_rev_dct4(), ff_line_noise_c(), ff_log2_16bit_c(), ff_log2_c(), ff_mjpeg_decode_dht(), ff_mjpeg_decode_sos(), ff_mjpeg_escape_FF(), ff_mpa_synth_init_TMPL(), ff_mpeg4_decode_picture_header(), ff_print_AM_MEDIA_TYPE(), ff_print_debug_info2(), ff_rm_read_mdpr_codecdata(), ff_rtjpeg_decode_frame_yuv420(), ff_simple_idct_axp(), ff_snow_inner_add_yblock(), ff_srtp_decrypt(), ff_tadd_bytes_metadata(), ff_tadd_shorts_metadata(), ff_vorbis_comment(), ff_vp9dsp_init_x86(), fill16(), fill24(), fill32(), fill_picture_rgb(), fill_rectangle(), fill_slice(), fillPlane16(), filter(), filter_frame(), filter_slice(), find_marker(), find_next_start_code(), frame_block_to_cell(), g723_1_decode_frame(), gb_get_v(), get_amv(), get_audio_frame(), get_block_rd(), get_egolomb(), get_graph_color(), get_palette_transparency_index(), get_s(), get_s16l(), get_sbits_inv(), get_size(), get_sr_golomb(), get_sr_golomb_flac(), get_symbol2(), get_visual_weight(), get_vlc_symbol(), getsigctxno(), gif_image_write_header(), gif_image_write_image(), gif_read_header1(), h264_filter_mb_fast_internal(), hls_read_header(), horizontal_compose_fidelityi(), horizX1Filter(), hqx_idct_put(), huffman_decode(), idcin_decode_vlcs(), idct(), idct248_error(), idct248_ref(), init(), init_exp(), init_h263_dc_for_msmpeg4(), init_qexp(), init_uni_dc_tab(), initFilter(), int_cos(), int_pow(), inverse(), isinf(), isnan(), iso_clip(), jpeg2000_decode_packet(), lcg_random(), lerp(), ljpeg_decode_yuv_scan(), ljpeg_encode_yuv_mb(), load_matrix(), loco_get_rice(), log2sample(), lu_to_y(), main(), mix_1_to_2_fltp_flt_c(), mjpeg_decode_scan(), mono_to_stereo(), mp3_parse_info_tag(), mp3_parse_vbr_tags(), mp3_parse_vbri_tag(), mp3_write_audio_packet(), mp_build_rgb_yuv_table(), mp_decode_layer1(), mp_decode_layer2(), mp_set_zero_yuv(), mp_yuv_to_rgb(), MPA_encode_init(), mpeg1_decode_sequence(), mpeg1_encode_sequence_header(), mpeg4_encode_dc(), mpeg4_is_resync(), mss2_blit_wmv9_template(), multiswap_inv_step(), multiswap_step(), mv_read_header(), nelly_decode_block(), normalize_samples(), nsv_resync(), parse_options(), parse_pcr(), parse_volume(), pcm_decode_frame(), pcm_encode_frame(), pcx_decode_frame(), pink_fill(), playlist_in_multiple_variants(), plot_cqt(), plot_spectrum_column(), pnm_decode_frame(), pow_m1_4(), pred4x4_horizontal_add(), pred4x4_vertical_add(), pred4x4_vertical_vp8_c(), pred8x8l_horizontal_add(), pred8x8l_horizontal_filter_add(), pred8x8l_vertical_add(), pred8x8l_vertical_filter_add(), predict_slice(), predict_slice_buffered(), print_fps(), process_slice_uyvy422(), process_slice_yuv420p(), process_slice_yuv422p(), put_vlc_symbol(), quantize_mantissas_blk_ch(), radix_count(), radix_sort_pass(), read_block_types(), read_colors(), read_data(), read_dcs(), read_extra_header(), read_header(), read_motion_values(), read_patterns(), read_quant_table(), read_runs(), remove_wasted_bits(), resample_cubic(), resample_linear(), rice_count_exact(), rv10_decode_packet(), rv10_write_header(), rv40_decode_intra_types(), sbr_qmf_synthesis(), set(), set_params(), set_sr_golomb(), set_sr_golomb_flac(), setctx_2d(), shuffle_bytes_2103_c(), shuffle_bytes_2103_TMPL(), sign_extend(), skip_check(), smk_get_code(), srt_probe(), subtitle_thread(), swf_read_packet(), swf_write_header(), swri_get_dither(), swri_rematrix(), sws_scale(), sym_quant(), tm2_decode_blocks(), tm2_read_deltas(), txd_decode_frame(), unpack_coeffs(), update_md5_sum(), update_vlc_state(), utvideo_decode_frame(), utvideo_encode_frame(), v308_decode_frame(), v308_encode_frame(), v408_decode_frame(), v408_encode_frame(), v410_decode_frame(), v410_encode_frame(), vaapi_vc1_decode_slice(), vaapi_vc1_start_frame(), var_read_float(), var_read_int(), vble_restore_plane(), vc1_pack_bitplanes(), vcr2_init_sequence(), vdpau_vc1_decode_slice(), vdpau_vc1_start_frame(), vertX1Filter_TMPL(), vorbis_floor1_decode(), vp56_rac_gets_nn(), vp5_adjust(), vp6_adjust(), vp8_rac_get_coeff(), vp8_rac_get_nn(), vp8_rac_get_sint(), wma_decode_block(), wma_lsp_to_curve(), wmv9_init(), wnv1_get_code(), worker(), write_extradata(), y216_decode_frame(), y41p_decode_frame(), y41p_encode_frame(), yuv2nv12cX_c(), yuv4_decode_frame(), yuv4_encode_frame(), and zero12v_decode_frame().

const { ... } intensity_color_table[]

Initial value:

= {
    {    0,                  0,                  0,                   0 },
    { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },
    { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },
    { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },
    { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },
    { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },
    { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },
    {    1,                  1,                  0,                   0 }
}

Referenced by plot_spectrum_column().

const AVFilterPad showspectrum_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .filter_frame = filter_frame,
    },
    { NULL }
}

Definition at line 504 of file avf_showspectrum.c.

const AVFilterPad showspectrum_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_VIDEO,
        .config_props  = config_output,
        .request_frame = request_frame,
    },
    { NULL }
}

Definition at line 513 of file avf_showspectrum.c.

AVFilter ff_avf_showspectrum

Initial value:

= {
    .name          = "showspectrum",
    .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),
    .uninit        = uninit,
    .query_formats = query_formats,
    .priv_size     = sizeof(ShowSpectrumContext),
    .inputs        = showspectrum_inputs,
    .outputs       = showspectrum_outputs,
    .priv_class    = &showspectrum_class,
}

Definition at line 523 of file avf_showspectrum.c.

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation