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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /media/ffvpx/libavutil/channel_layout.c
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'media/ffvpx/libavutil/channel_layout.c')
-rw-r--r--media/ffvpx/libavutil/channel_layout.c265
1 files changed, 265 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/channel_layout.c b/media/ffvpx/libavutil/channel_layout.c
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+++ b/media/ffvpx/libavutil/channel_layout.c
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+/*
+ * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * audio channel layout utility functions
+ */
+
+#include <stdint.h>
+
+#include "avstring.h"
+#include "avutil.h"
+#include "channel_layout.h"
+#include "bprint.h"
+#include "common.h"
+
+struct channel_name {
+ const char *name;
+ const char *description;
+};
+
+static const struct channel_name channel_names[] = {
+ [0] = { "FL", "front left" },
+ [1] = { "FR", "front right" },
+ [2] = { "FC", "front center" },
+ [3] = { "LFE", "low frequency" },
+ [4] = { "BL", "back left" },
+ [5] = { "BR", "back right" },
+ [6] = { "FLC", "front left-of-center" },
+ [7] = { "FRC", "front right-of-center" },
+ [8] = { "BC", "back center" },
+ [9] = { "SL", "side left" },
+ [10] = { "SR", "side right" },
+ [11] = { "TC", "top center" },
+ [12] = { "TFL", "top front left" },
+ [13] = { "TFC", "top front center" },
+ [14] = { "TFR", "top front right" },
+ [15] = { "TBL", "top back left" },
+ [16] = { "TBC", "top back center" },
+ [17] = { "TBR", "top back right" },
+ [29] = { "DL", "downmix left" },
+ [30] = { "DR", "downmix right" },
+ [31] = { "WL", "wide left" },
+ [32] = { "WR", "wide right" },
+ [33] = { "SDL", "surround direct left" },
+ [34] = { "SDR", "surround direct right" },
+ [35] = { "LFE2", "low frequency 2" },
+};
+
+static const char *get_channel_name(int channel_id)
+{
+ if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names))
+ return NULL;
+ return channel_names[channel_id].name;
+}
+
+static const struct {
+ const char *name;
+ int nb_channels;
+ uint64_t layout;
+} channel_layout_map[] = {
+ { "mono", 1, AV_CH_LAYOUT_MONO },
+ { "stereo", 2, AV_CH_LAYOUT_STEREO },
+ { "2.1", 3, AV_CH_LAYOUT_2POINT1 },
+ { "3.0", 3, AV_CH_LAYOUT_SURROUND },
+ { "3.0(back)", 3, AV_CH_LAYOUT_2_1 },
+ { "4.0", 4, AV_CH_LAYOUT_4POINT0 },
+ { "quad", 4, AV_CH_LAYOUT_QUAD },
+ { "quad(side)", 4, AV_CH_LAYOUT_2_2 },
+ { "3.1", 4, AV_CH_LAYOUT_3POINT1 },
+ { "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },
+ { "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 },
+ { "4.1", 5, AV_CH_LAYOUT_4POINT1 },
+ { "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },
+ { "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 },
+ { "6.0", 6, AV_CH_LAYOUT_6POINT0 },
+ { "6.0(front)", 6, AV_CH_LAYOUT_6POINT0_FRONT },
+ { "hexagonal", 6, AV_CH_LAYOUT_HEXAGONAL },
+ { "6.1", 7, AV_CH_LAYOUT_6POINT1 },
+ { "6.1(back)", 7, AV_CH_LAYOUT_6POINT1_BACK },
+ { "6.1(front)", 7, AV_CH_LAYOUT_6POINT1_FRONT },
+ { "7.0", 7, AV_CH_LAYOUT_7POINT0 },
+ { "7.0(front)", 7, AV_CH_LAYOUT_7POINT0_FRONT },
+ { "7.1", 8, AV_CH_LAYOUT_7POINT1 },
+ { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK },
+ { "7.1(wide-side)", 8, AV_CH_LAYOUT_7POINT1_WIDE },
+ { "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL },
+ { "hexadecagonal", 16, AV_CH_LAYOUT_HEXADECAGONAL },
+ { "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, },
+};
+
+static uint64_t get_channel_layout_single(const char *name, int name_len)
+{
+ int i;
+ char *end;
+ int64_t layout;
+
+ for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) {
+ if (strlen(channel_layout_map[i].name) == name_len &&
+ !memcmp(channel_layout_map[i].name, name, name_len))
+ return channel_layout_map[i].layout;
+ }
+ for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
+ if (channel_names[i].name &&
+ strlen(channel_names[i].name) == name_len &&
+ !memcmp(channel_names[i].name, name, name_len))
+ return (int64_t)1 << i;
+
+ errno = 0;
+ i = strtol(name, &end, 10);
+
+ if (!errno && (end + 1 - name == name_len && *end == 'c'))
+ return av_get_default_channel_layout(i);
+
+ errno = 0;
+ layout = strtoll(name, &end, 0);
+ if (!errno && end - name == name_len)
+ return FFMAX(layout, 0);
+ return 0;
+}
+
+uint64_t av_get_channel_layout(const char *name)
+{
+ const char *n, *e;
+ const char *name_end = name + strlen(name);
+ int64_t layout = 0, layout_single;
+
+ for (n = name; n < name_end; n = e + 1) {
+ for (e = n; e < name_end && *e != '+' && *e != '|'; e++);
+ layout_single = get_channel_layout_single(n, e - n);
+ if (!layout_single)
+ return 0;
+ layout |= layout_single;
+ }
+ return layout;
+}
+
+void av_bprint_channel_layout(struct AVBPrint *bp,
+ int nb_channels, uint64_t channel_layout)
+{
+ int i;
+
+ if (nb_channels <= 0)
+ nb_channels = av_get_channel_layout_nb_channels(channel_layout);
+
+ for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
+ if (nb_channels == channel_layout_map[i].nb_channels &&
+ channel_layout == channel_layout_map[i].layout) {
+ av_bprintf(bp, "%s", channel_layout_map[i].name);
+ return;
+ }
+
+ av_bprintf(bp, "%d channels", nb_channels);
+ if (channel_layout) {
+ int i, ch;
+ av_bprintf(bp, " (");
+ for (i = 0, ch = 0; i < 64; i++) {
+ if ((channel_layout & (UINT64_C(1) << i))) {
+ const char *name = get_channel_name(i);
+ if (name) {
+ if (ch > 0)
+ av_bprintf(bp, "+");
+ av_bprintf(bp, "%s", name);
+ }
+ ch++;
+ }
+ }
+ av_bprintf(bp, ")");
+ }
+}
+
+void av_get_channel_layout_string(char *buf, int buf_size,
+ int nb_channels, uint64_t channel_layout)
+{
+ AVBPrint bp;
+
+ av_bprint_init_for_buffer(&bp, buf, buf_size);
+ av_bprint_channel_layout(&bp, nb_channels, channel_layout);
+}
+
+int av_get_channel_layout_nb_channels(uint64_t channel_layout)
+{
+ return av_popcount64(channel_layout);
+}
+
+int64_t av_get_default_channel_layout(int nb_channels) {
+ int i;
+ for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
+ if (nb_channels == channel_layout_map[i].nb_channels)
+ return channel_layout_map[i].layout;
+ return 0;
+}
+
+int av_get_channel_layout_channel_index(uint64_t channel_layout,
+ uint64_t channel)
+{
+ if (!(channel_layout & channel) ||
+ av_get_channel_layout_nb_channels(channel) != 1)
+ return AVERROR(EINVAL);
+ channel_layout &= channel - 1;
+ return av_get_channel_layout_nb_channels(channel_layout);
+}
+
+const char *av_get_channel_name(uint64_t channel)
+{
+ int i;
+ if (av_get_channel_layout_nb_channels(channel) != 1)
+ return NULL;
+ for (i = 0; i < 64; i++)
+ if ((1ULL<<i) & channel)
+ return get_channel_name(i);
+ return NULL;
+}
+
+const char *av_get_channel_description(uint64_t channel)
+{
+ int i;
+ if (av_get_channel_layout_nb_channels(channel) != 1)
+ return NULL;
+ for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
+ if ((1ULL<<i) & channel)
+ return channel_names[i].description;
+ return NULL;
+}
+
+uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
+{
+ int i;
+
+ if (av_get_channel_layout_nb_channels(channel_layout) <= index)
+ return 0;
+
+ for (i = 0; i < 64; i++) {
+ if ((1ULL << i) & channel_layout && !index--)
+ return 1ULL << i;
+ }
+ return 0;
+}
+
+int av_get_standard_channel_layout(unsigned index, uint64_t *layout,
+ const char **name)
+{
+ if (index >= FF_ARRAY_ELEMS(channel_layout_map))
+ return AVERROR_EOF;
+ if (layout) *layout = channel_layout_map[index].layout;
+ if (name) *name = channel_layout_map[index].name;
+ return 0;
+}