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authorJustin Ruggles <justin.ruggles@gmail.com>2012-11-10 09:03:17 -0500
committerJustin Ruggles <justin.ruggles@gmail.com>2012-11-11 13:35:12 -0500
commit5980f5dd18822f29cfd583c9c085c3e77d81aa72 (patch)
treefd0f7c657d16f251d00247cff8e43cc596b5b981 /libavutil/channel_layout.c
parent802713c4e7b41bc2deed754d78649945c3442063 (diff)
downloadffmpeg-5980f5dd18822f29cfd583c9c085c3e77d81aa72.tar.gz
lavu: rename audioconvert.* to channel_layout.* and deprecate audioconvert.h
Diffstat (limited to 'libavutil/channel_layout.c')
-rw-r--r--libavutil/channel_layout.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/libavutil/channel_layout.c b/libavutil/channel_layout.c
new file mode 100644
index 0000000000..79e398e41a
--- /dev/null
+++ b/libavutil/channel_layout.c
@@ -0,0 +1,231 @@
+/*
+ * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; 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 "avstring.h"
+#include "avutil.h"
+#include "channel_layout.h"
+#include "common.h"
+
+static const char * const 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];
+}
+
+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 },
+ { "stereo", 2, AV_CH_LAYOUT_STEREO_DOWNMIX },
+ { "2.1", 3, AV_CH_LAYOUT_2POINT1 },
+ { "3.0", 3, AV_CH_LAYOUT_SURROUND },
+ { "3.0(back)", 3, AV_CH_LAYOUT_2_1 },
+ { "3.1", 4, AV_CH_LAYOUT_3POINT1 },
+ { "4.0", 4, AV_CH_LAYOUT_4POINT0 },
+ { "quad", 4, AV_CH_LAYOUT_QUAD },
+ { "quad(side)", 4, AV_CH_LAYOUT_2_2 },
+ { "4.1", 5, AV_CH_LAYOUT_4POINT1 },
+ { "5.0", 5, AV_CH_LAYOUT_5POINT0 },
+ { "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },
+ { "5.1", 6, AV_CH_LAYOUT_5POINT1 },
+ { "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },
+ { "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", 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 },
+ { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK },
+ { "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL },
+ { "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, },
+ { 0 }
+};
+
+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) - 1; 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] &&
+ strlen(channel_names[i]) == name_len &&
+ !memcmp(channel_names[i], name, name_len))
+ return (int64_t)1 << i;
+ i = strtol(name, &end, 10);
+ if (end - name == name_len ||
+ (end + 1 - name == name_len && *end == 'c'))
+ return av_get_default_channel_layout(i);
+ layout = strtoll(name, &end, 0);
+ if (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_get_channel_layout_string(char *buf, int buf_size,
+ 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; channel_layout_map[i].name; i++)
+ if (nb_channels == channel_layout_map[i].nb_channels &&
+ channel_layout == channel_layout_map[i].layout) {
+ av_strlcpy(buf, channel_layout_map[i].name, buf_size);
+ return;
+ }
+
+ snprintf(buf, buf_size, "%d channels", nb_channels);
+ if (channel_layout) {
+ int i, ch;
+ av_strlcat(buf, " (", buf_size);
+ 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_strlcat(buf, "|", buf_size);
+ av_strlcat(buf, name, buf_size);
+ }
+ ch++;
+ }
+ }
+ av_strlcat(buf, ")", buf_size);
+ }
+}
+
+int av_get_channel_layout_nb_channels(uint64_t channel_layout)
+{
+ return av_popcount64(channel_layout);
+}
+
+uint64_t av_get_default_channel_layout(int nb_channels)
+{
+ switch(nb_channels) {
+ case 1: return AV_CH_LAYOUT_MONO;
+ case 2: return AV_CH_LAYOUT_STEREO;
+ case 3: return AV_CH_LAYOUT_SURROUND;
+ case 4: return AV_CH_LAYOUT_QUAD;
+ case 5: return AV_CH_LAYOUT_5POINT0;
+ case 6: return AV_CH_LAYOUT_5POINT1;
+ case 7: return AV_CH_LAYOUT_6POINT1;
+ case 8: return AV_CH_LAYOUT_7POINT1;
+ default: 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;
+}
+
+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;
+}