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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,181 @@ | ||
| /* | ||
| * filter_audioseam.c -- smooth seams between clips in a playlist | ||
| * Copyright (C) 2023 Meltytech, LLC | ||
| * | ||
| * This library is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU Lesser General Public | ||
| * License as published by the Free Software Foundation; either | ||
| * version 2.1 of the License, or (at your option) any later version. | ||
| * | ||
| * This library is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| * Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public | ||
| * License along with this library; if not, write to the Free Software | ||
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| */ | ||
|
|
||
| #include <framework/mlt.h> | ||
|
|
||
| #include <math.h> | ||
| #include <stdlib.h> | ||
|
|
||
| typedef struct | ||
| { | ||
| struct mlt_audio_s prev_audio; | ||
| } private_data; | ||
|
|
||
| static float db_delta(float a, float b) | ||
| { | ||
| float dba = 0; | ||
| float dbb = 0; | ||
| const float essentially_zero = 0.001; | ||
| // Calculate db from zero | ||
| if (fabs(a) > essentially_zero) { | ||
| dba = log10(fabs(a)) * 20; | ||
| } | ||
| if (fabs(b) > essentially_zero) { | ||
| dbb = log10(fabs(b)) * 20; | ||
| } | ||
| // Apply sign | ||
| if (a < 0) { | ||
| dba *= -1.0; | ||
| } | ||
| if (b < 0) { | ||
| dba *= -1; | ||
| } | ||
| return dba - dbb; | ||
| } | ||
|
|
||
| static int filter_get_audio(mlt_frame frame, | ||
| void **buffer, | ||
| mlt_audio_format *format, | ||
| int *frequency, | ||
| int *channels, | ||
| int *samples) | ||
| { | ||
| mlt_filter filter = mlt_frame_pop_audio(frame); | ||
| mlt_properties filter_properties = MLT_FILTER_PROPERTIES(filter); | ||
| private_data *pdata = (private_data *) filter->child; | ||
| int clip_position = mlt_properties_get_int(MLT_FRAME_PROPERTIES(frame), | ||
| "meta.playlist.clip_position"); | ||
| int clip_length = mlt_properties_get_int(MLT_FRAME_PROPERTIES(frame), | ||
| "meta.playlist.clip_length"); | ||
|
|
||
| if (clip_length == 0 || (clip_position != 0 && clip_position != (clip_length - 1))) { | ||
| // Only operate on the first and last frame of every clip | ||
| return mlt_frame_get_audio(frame, buffer, format, frequency, channels, samples); | ||
| } | ||
|
|
||
| *format = mlt_audio_f32le; | ||
| int ret = mlt_frame_get_audio(frame, buffer, format, frequency, channels, samples); | ||
| if (ret != 0) { | ||
| return ret; | ||
| } | ||
|
|
||
| struct mlt_audio_s curr_audio; | ||
| mlt_audio_set_values(&curr_audio, *buffer, *frequency, *format, *samples, *channels); | ||
|
|
||
| if (clip_position == 0) { | ||
| if (!pdata->prev_audio.data) { | ||
| mlt_log_debug(MLT_FILTER_SERVICE(filter), "Missing previous audio\n"); | ||
| } else { | ||
| float *prev_data = pdata->prev_audio.data; | ||
| float *curr_data = curr_audio.data; | ||
| float level_delta = db_delta(prev_data[pdata->prev_audio.samples - 1], curr_data[0]); | ||
| double discontinuity_threshold = mlt_properties_get_double(filter_properties, | ||
| "discontinuity_threshold"); | ||
| if (fabs(level_delta) > discontinuity_threshold) { | ||
| // We have decided to create a transition with the previous frame. | ||
| // Reverse the prevous frame and use the reversed samples as faux | ||
| // data that is continuous from the prevous frame. | ||
| // Mix/fade the reversed previous samples with the new samples to create a transition. | ||
| mlt_audio_reverse(&pdata->prev_audio); | ||
| int fade_samples = 1000; | ||
| if (fade_samples > curr_audio.samples) { | ||
| fade_samples = curr_audio.samples; | ||
| } | ||
| if (fade_samples > pdata->prev_audio.samples) { | ||
| fade_samples = pdata->prev_audio.samples; | ||
| } | ||
| for (int c = 0; c < curr_audio.channels; c++) { | ||
| curr_data = (float *) curr_audio.data + c; | ||
| prev_data = (float *) pdata->prev_audio.data + c; | ||
| for (int i = 0; i < fade_samples; i++) { | ||
| float mix = (1.0 / fade_samples) * (float) (fade_samples - i); | ||
| *curr_data = (*prev_data * mix) + (*curr_data * (1.0 - mix)); | ||
| curr_data += curr_audio.channels; | ||
| prev_data += curr_audio.channels; | ||
| } | ||
| } | ||
| // If this flag is set, it must be cleared so that other services will know it can't be ignored. | ||
| mlt_properties_clear(MLT_FRAME_PROPERTIES(frame), "test_audio"); | ||
| // Increment the counter | ||
| mlt_properties_set_int(filter_properties, | ||
| "seam_count", | ||
| mlt_properties_get_int(filter_properties, "seam_count") + 1); | ||
| } | ||
| } | ||
| mlt_audio_free_data(&pdata->prev_audio); | ||
| } else if (clip_position == (clip_length - 1)) { | ||
| // Save the samples of the last frame to be used to mix with the first frame of the next clip. | ||
| mlt_audio_set_values(&pdata->prev_audio, NULL, *frequency, *format, *samples, *channels); | ||
| mlt_audio_alloc_data(&pdata->prev_audio); | ||
| mlt_audio_copy(&pdata->prev_audio, &curr_audio, *samples, 0, 0); | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static mlt_frame filter_process(mlt_filter filter, mlt_frame frame) | ||
| { | ||
| mlt_properties frame_properties = MLT_FRAME_PROPERTIES(frame); | ||
| int clip_position = mlt_properties_get_int(frame_properties, "meta.playlist.clip_position"); | ||
| int clip_length = mlt_properties_get_int(frame_properties, "meta.playlist.clip_length"); | ||
|
|
||
| // Only operate on the first and last frame of every clip | ||
| if (clip_length > 0 && (clip_position == 0 || clip_position == (clip_length - 1))) { | ||
| // Be sure to process blanks in a playlist | ||
| mlt_properties_clear(frame_properties, "test_audio"); | ||
| mlt_frame_push_audio(frame, filter); | ||
| mlt_frame_push_audio(frame, filter_get_audio); | ||
| } | ||
| return frame; | ||
| } | ||
|
|
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| static void filter_close(mlt_filter filter) | ||
| { | ||
| private_data *pdata = (private_data *) filter->child; | ||
|
|
||
| if (pdata) { | ||
| mlt_audio_free_data(&pdata->prev_audio); | ||
| } | ||
| free(pdata); | ||
| filter->child = NULL; | ||
| filter->close = NULL; | ||
| filter->parent.close = NULL; | ||
| mlt_service_close(&filter->parent); | ||
| } | ||
|
|
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| mlt_filter filter_audioseam_init(mlt_profile profile, | ||
| mlt_service_type type, | ||
| const char *id, | ||
| char *arg) | ||
| { | ||
| mlt_filter filter = mlt_filter_new(); | ||
| private_data *pdata = (private_data *) calloc(1, sizeof(private_data)); | ||
|
|
||
| if (filter && pdata) { | ||
| filter->close = filter_close; | ||
| filter->process = filter_process; | ||
| filter->child = pdata; | ||
| } else { | ||
| mlt_filter_close(filter); | ||
| filter = NULL; | ||
| free(pdata); | ||
| } | ||
|
|
||
| return filter; | ||
| } |
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