avcodec/ac3{dec,enc}: Deduplicate gain levels table

(I don't know why the encoder only uses eight of the nine values.)

Andreas Rheinhardt committed 1 year ago

Commit dbd2ca31 parent 11723b34 files · +32 −28Browse files

Unified · Split

4 files

libavcodec/ac3dec.c +12 −24
libavcodec/ac3enc.c +1 −4
libavcodec/ac3tab.c +14 −0
libavcodec/ac3tab.h +5 −0

@@ -61,18 +61,6 @@ static float dynamic_range_tab[256]; · 60 unmodified lines
61	61	float ff_ac3_heavy_dynamic_range_tab[256];
62	62	#endif
63	63
64		−/** Adjustments in dB gain */
65		−static const float gain_levels[9] = {
66		− LEVEL_PLUS_3DB,
67		− LEVEL_PLUS_1POINT5DB,
68		− LEVEL_ONE,
69		− LEVEL_MINUS_1POINT5DB,
70		− LEVEL_MINUS_3DB,
71		− LEVEL_MINUS_4POINT5DB,
72		− LEVEL_MINUS_6DB,
73		− LEVEL_ZERO,
74		− LEVEL_MINUS_9DB
75		−};
76	64
77	65	/** Adjustments in dB gain (LFE, +10 to -21 dB) */
78	66	static const float gain_levels_lfe[32] = {
@@ -346,8 +334,8 @@ static int parse_frame_header(AC3DecodeContext *s) · 267 unmodified lines
346	334	static int set_downmix_coeffs(AC3DecodeContext *s)
347	335	{
348	336	int i;
349		− float cmix = gain_levels[s-> center_mix_level];
350		− float smix = gain_levels[s->surround_mix_level];
	337	+ float cmix = ff_ac3_gain_levels[s-> center_mix_level];
	338	+ float smix = ff_ac3_gain_levels[s->surround_mix_level];
351	339	float norm0, norm1;
352	340	float downmix_coeffs[2][AC3_MAX_CHANNELS];
353	341
@@ -360,8 +348,8 @@ static int set_downmix_coeffs(AC3DecodeContext *s) · 6 unmodified lines
360	348	}
361	349
362	350	for (i = 0; i < s->fbw_channels; i++) {
363		− downmix_coeffs[0][i] = gain_levels[ac3_default_coeffs[s->channel_mode][i][0]];
364		− downmix_coeffs[1][i] = gain_levels[ac3_default_coeffs[s->channel_mode][i][1]];
	351	+ downmix_coeffs[0][i] = ff_ac3_gain_levels[ac3_default_coeffs[s->channel_mode][i][0]];
	352	+ downmix_coeffs[1][i] = ff_ac3_gain_levels[ac3_default_coeffs[s->channel_mode][i][1]];
365	353	}
366	354	if (s->channel_mode > 1 && s->channel_mode & 1) {
367	355	downmix_coeffs[0][1] = downmix_coeffs[1][1] = cmix;
@@ -1562,10 +1550,10 @@ dependent_frame: · 1194 unmodified lines
1562	1550	s->output_mode = AC3_CHMODE_STEREO;
1563	1551	}
1564	1552
1565		− s->loro_center_mix_level = gain_levels[s-> center_mix_level];
1566		− s->loro_surround_mix_level = gain_levels[s->surround_mix_level];
1567		− s->ltrt_center_mix_level = gain_levels[s-> center_mix_level_ltrt];
1568		− s->ltrt_surround_mix_level = gain_levels[s->surround_mix_level_ltrt];
	1553	+ s->loro_center_mix_level = ff_ac3_gain_levels[s-> center_mix_level];
	1554	+ s->loro_surround_mix_level = ff_ac3_gain_levels[s->surround_mix_level];
	1555	+ s->ltrt_center_mix_level = ff_ac3_gain_levels[s-> center_mix_level_ltrt];
	1556	+ s->ltrt_surround_mix_level = ff_ac3_gain_levels[s->surround_mix_level_ltrt];
1569	1557	switch (s->preferred_downmix) {
1570	1558	case AC3_DMIXMOD_LTRT:
1571	1559	s->preferred_stereo_downmix = AV_DOWNMIX_TYPE_LTRT;
@@ -1804,10 +1792,10 @@ skip: · 232 unmodified lines
1804	1792	downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_UNKNOWN;
1805	1793	break;
1806	1794	}
1807		− downmix_info->center_mix_level = gain_levels[s-> center_mix_level];
1808		− downmix_info->center_mix_level_ltrt = gain_levels[s-> center_mix_level_ltrt];
1809		− downmix_info->surround_mix_level = gain_levels[s-> surround_mix_level];
1810		− downmix_info->surround_mix_level_ltrt = gain_levels[s->surround_mix_level_ltrt];
	1795	+ downmix_info->center_mix_level = ff_ac3_gain_levels[s-> center_mix_level];
	1796	+ downmix_info->center_mix_level_ltrt = ff_ac3_gain_levels[s-> center_mix_level_ltrt];
	1797	+ downmix_info->surround_mix_level = ff_ac3_gain_levels[s-> surround_mix_level];
	1798	+ downmix_info->surround_mix_level_ltrt = ff_ac3_gain_levels[s->surround_mix_level_ltrt];
1811	1799	if (s->lfe_mix_level_exists)
1812	1800	downmix_info->lfe_mix_level = gain_levels_lfe[s->lfe_mix_level];
1813	1801	else

libavcodec/ac3enc.c+1−4

@@ -71,10 +71,7 @@ static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = { · 70 unmodified lines
71	71	};
72	72
73	73	#define EXTMIXLEV_NUM_OPTIONS 8
74		−static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = {
75		− LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_1POINT5DB,
76		− LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO
77		−};
	74	+#define extmixlev_options ff_ac3_gain_levels
78	75
79	76	/* The first two options apply only to the AC-3 encoders;
80	77	* the rest is also valid for EAC-3. When modifying it,

libavcodec/ac3tab.c+14−0

@@ -25,6 +25,7 @@ · 24 unmodified lines
25	25	*/
26	26
27	27	#include "libavutil/channel_layout.h"
	28	+#include "libavutil/mathematics.h"
28	29
29	30	#include "ac3tab.h"
30	31
@@ -147,6 +148,19 @@ const uint16_t ff_ac3_fast_gain_tab[8]= { · 116 unmodified lines
147	148	0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
148	149	};
149	150
	151	+/** Adjustments in dB gain */
	152	+const float ff_ac3_gain_levels[9] = {
	153	+ LEVEL_PLUS_3DB,
	154	+ LEVEL_PLUS_1POINT5DB,
	155	+ LEVEL_ONE,
	156	+ LEVEL_MINUS_1POINT5DB,
	157	+ LEVEL_MINUS_3DB,
	158	+ LEVEL_MINUS_4POINT5DB,
	159	+ LEVEL_MINUS_6DB,
	160	+ LEVEL_ZERO,
	161	+ LEVEL_MINUS_9DB
	162	+};
	163	+
150	164	const uint64_t ff_eac3_custom_channel_map_locations[16][2] = {
151	165	{ 1, AV_CH_FRONT_LEFT },
152	166	{ 1, AV_CH_FRONT_CENTER },

libavcodec/ac3tab.h+5−0

@@ -26,6 +26,9 @@ · 25 unmodified lines
26	26
27	27	#include "ac3defs.h"
28	28
	29	+#include "libavutil/attributes_internal.h"
	30	+
	31	+FF_VISIBILITY_PUSH_HIDDEN
29	32	extern const uint16_t ff_ac3_frame_size_tab[38][3];
30	33	extern const uint8_t ff_ac3_channels_tab[8];
31	34	extern const uint16_t ff_ac3_channel_layout_tab[8];
@@ -43,7 +46,9 @@ extern const int16_t ff_ac3_floor_tab[8]; · 11 unmodified lines
43	46	extern const uint16_t ff_ac3_fast_gain_tab[8];
44	47	extern const uint8_t ff_ac3_band_start_tab[AC3_CRITICAL_BANDS+1];
45	48	extern const uint8_t ff_ac3_bin_to_band_tab[253];
	49	+extern const float ff_ac3_gain_levels[9];
46	50	extern const uint64_t ff_eac3_custom_channel_map_locations[16][2];
	51	+FF_VISIBILITY_POP_HIDDEN
47	52
48	53	#define COMMON_CHANNEL_MAP \
49	54	{ { 0, 1, }, { 0, 1, 2, } },\

avcodec/ac3{dec,enc}: Deduplicate gain levels table

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