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https://git.ffmpeg.org/ffmpeg.git
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avutil/channel_layout: Add a new channel layout API
The new API is more extensible and allows for custom layouts. More accurate information is exported, eg for decoders that do not set a channel layout, lavc will not make one up for them. Deprecate the old API working with just uint64_t bitmasks. Expanded and completed by Vittorio Giovara <vittorio.giovara@gmail.com> and James Almer <jamrial@gmail.com>. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Anton Khirnov
committed by
James Almer
James Almer
parent
dcc3f62270
commit
086a804806
@@ -32,6 +32,7 @@
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#include "common.h"
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#include "error.h"
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#include "macros.h"
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#include "opt.h"
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struct channel_name {
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const char *name;
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@@ -39,81 +40,149 @@ struct channel_name {
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};
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static const struct channel_name channel_names[] = {
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[0] = { "FL", "front left" },
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[1] = { "FR", "front right" },
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[2] = { "FC", "front center" },
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[3] = { "LFE", "low frequency" },
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[4] = { "BL", "back left" },
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[5] = { "BR", "back right" },
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[6] = { "FLC", "front left-of-center" },
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[7] = { "FRC", "front right-of-center" },
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[8] = { "BC", "back center" },
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[9] = { "SL", "side left" },
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[10] = { "SR", "side right" },
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[11] = { "TC", "top center" },
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[12] = { "TFL", "top front left" },
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[13] = { "TFC", "top front center" },
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[14] = { "TFR", "top front right" },
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[15] = { "TBL", "top back left" },
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[16] = { "TBC", "top back center" },
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[17] = { "TBR", "top back right" },
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[29] = { "DL", "downmix left" },
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[30] = { "DR", "downmix right" },
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[31] = { "WL", "wide left" },
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[32] = { "WR", "wide right" },
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[33] = { "SDL", "surround direct left" },
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[34] = { "SDR", "surround direct right" },
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[35] = { "LFE2", "low frequency 2" },
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[36] = { "TSL", "top side left" },
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[37] = { "TSR", "top side right" },
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[38] = { "BFC", "bottom front center" },
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[39] = { "BFL", "bottom front left" },
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[40] = { "BFR", "bottom front right" },
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[AV_CHAN_FRONT_LEFT ] = { "FL", "front left" },
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[AV_CHAN_FRONT_RIGHT ] = { "FR", "front right" },
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[AV_CHAN_FRONT_CENTER ] = { "FC", "front center" },
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[AV_CHAN_LOW_FREQUENCY ] = { "LFE", "low frequency" },
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[AV_CHAN_BACK_LEFT ] = { "BL", "back left" },
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[AV_CHAN_BACK_RIGHT ] = { "BR", "back right" },
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[AV_CHAN_FRONT_LEFT_OF_CENTER ] = { "FLC", "front left-of-center" },
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[AV_CHAN_FRONT_RIGHT_OF_CENTER] = { "FRC", "front right-of-center" },
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[AV_CHAN_BACK_CENTER ] = { "BC", "back center" },
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[AV_CHAN_SIDE_LEFT ] = { "SL", "side left" },
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[AV_CHAN_SIDE_RIGHT ] = { "SR", "side right" },
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[AV_CHAN_TOP_CENTER ] = { "TC", "top center" },
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[AV_CHAN_TOP_FRONT_LEFT ] = { "TFL", "top front left" },
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[AV_CHAN_TOP_FRONT_CENTER ] = { "TFC", "top front center" },
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[AV_CHAN_TOP_FRONT_RIGHT ] = { "TFR", "top front right" },
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[AV_CHAN_TOP_BACK_LEFT ] = { "TBL", "top back left" },
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[AV_CHAN_TOP_BACK_CENTER ] = { "TBC", "top back center" },
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[AV_CHAN_TOP_BACK_RIGHT ] = { "TBR", "top back right" },
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[AV_CHAN_STEREO_LEFT ] = { "DL", "downmix left" },
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[AV_CHAN_STEREO_RIGHT ] = { "DR", "downmix right" },
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[AV_CHAN_WIDE_LEFT ] = { "WL", "wide left" },
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[AV_CHAN_WIDE_RIGHT ] = { "WR", "wide right" },
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[AV_CHAN_SURROUND_DIRECT_LEFT ] = { "SDL", "surround direct left" },
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[AV_CHAN_SURROUND_DIRECT_RIGHT] = { "SDR", "surround direct right" },
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[AV_CHAN_LOW_FREQUENCY_2 ] = { "LFE2", "low frequency 2" },
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[AV_CHAN_TOP_SIDE_LEFT ] = { "TSL", "top side left" },
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[AV_CHAN_TOP_SIDE_RIGHT ] = { "TSR", "top side right" },
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[AV_CHAN_BOTTOM_FRONT_CENTER ] = { "BFC", "bottom front center" },
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[AV_CHAN_BOTTOM_FRONT_LEFT ] = { "BFL", "bottom front left" },
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[AV_CHAN_BOTTOM_FRONT_RIGHT ] = { "BFR", "bottom front right" },
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};
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static const char *get_channel_name(int channel_id)
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static const char *get_channel_name(enum AVChannel channel_id)
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{
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if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names))
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if ((unsigned) channel_id >= FF_ARRAY_ELEMS(channel_names) ||
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!channel_names[channel_id].name)
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return NULL;
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return channel_names[channel_id].name;
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}
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static const struct {
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void av_channel_name_bprint(AVBPrint *bp, enum AVChannel channel_id)
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{
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if ((unsigned)channel_id < FF_ARRAY_ELEMS(channel_names))
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av_bprintf(bp, "%s", channel_names[channel_id].name);
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else if (channel_id == AV_CHAN_NONE)
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av_bprintf(bp, "NONE");
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else
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av_bprintf(bp, "USR%d", channel_id);
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}
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int av_channel_name(char *buf, size_t buf_size, enum AVChannel channel_id)
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{
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AVBPrint bp;
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if (!buf && buf_size)
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return AVERROR(EINVAL);
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av_bprint_init_for_buffer(&bp, buf, buf_size);
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av_channel_name_bprint(&bp, channel_id);
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return bp.len;
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}
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void av_channel_description_bprint(AVBPrint *bp, enum AVChannel channel_id)
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{
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if ((unsigned)channel_id < FF_ARRAY_ELEMS(channel_names))
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av_bprintf(bp, "%s", channel_names[channel_id].description);
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else
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av_bprintf(bp, "user %d", channel_id);
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}
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int av_channel_description(char *buf, size_t buf_size, enum AVChannel channel_id)
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{
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AVBPrint bp;
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if (!buf && buf_size)
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return AVERROR(EINVAL);
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av_bprint_init_for_buffer(&bp, buf, buf_size);
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av_channel_description_bprint(&bp, channel_id);
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return bp.len;
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}
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enum AVChannel av_channel_from_string(const char *str)
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{
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int i;
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char *endptr = (char *)str;
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enum AVChannel id = AV_CHAN_NONE;
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for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) {
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if (channel_names[i].name && !strcmp(str, channel_names[i].name))
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return i;
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}
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if (!strncmp(str, "USR", 3)) {
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const char *p = str + 3;
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id = strtol(p, &endptr, 0);
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}
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if (id >= 0 && !*endptr)
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return id;
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return AV_CHAN_NONE;
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}
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struct channel_layout_name {
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const char *name;
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int nb_channels;
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uint64_t layout;
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} channel_layout_map[] = {
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{ "mono", 1, AV_CH_LAYOUT_MONO },
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{ "stereo", 2, AV_CH_LAYOUT_STEREO },
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{ "2.1", 3, AV_CH_LAYOUT_2POINT1 },
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{ "3.0", 3, AV_CH_LAYOUT_SURROUND },
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{ "3.0(back)", 3, AV_CH_LAYOUT_2_1 },
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{ "4.0", 4, AV_CH_LAYOUT_4POINT0 },
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{ "quad", 4, AV_CH_LAYOUT_QUAD },
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{ "quad(side)", 4, AV_CH_LAYOUT_2_2 },
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{ "3.1", 4, AV_CH_LAYOUT_3POINT1 },
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{ "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },
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{ "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 },
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{ "4.1", 5, AV_CH_LAYOUT_4POINT1 },
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{ "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },
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{ "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 },
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{ "6.0", 6, AV_CH_LAYOUT_6POINT0 },
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{ "6.0(front)", 6, AV_CH_LAYOUT_6POINT0_FRONT },
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{ "hexagonal", 6, AV_CH_LAYOUT_HEXAGONAL },
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{ "6.1", 7, AV_CH_LAYOUT_6POINT1 },
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{ "6.1(back)", 7, AV_CH_LAYOUT_6POINT1_BACK },
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{ "6.1(front)", 7, AV_CH_LAYOUT_6POINT1_FRONT },
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{ "7.0", 7, AV_CH_LAYOUT_7POINT0 },
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{ "7.0(front)", 7, AV_CH_LAYOUT_7POINT0_FRONT },
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{ "7.1", 8, AV_CH_LAYOUT_7POINT1 },
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{ "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK },
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{ "7.1(wide-side)", 8, AV_CH_LAYOUT_7POINT1_WIDE },
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{ "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL },
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{ "hexadecagonal", 16, AV_CH_LAYOUT_HEXADECAGONAL },
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{ "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, },
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{ "22.2", 24, AV_CH_LAYOUT_22POINT2, },
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AVChannelLayout layout;
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};
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static const struct channel_layout_name channel_layout_map[] = {
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{ "mono", AV_CHANNEL_LAYOUT_MONO },
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{ "stereo", AV_CHANNEL_LAYOUT_STEREO },
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{ "stereo", AV_CHANNEL_LAYOUT_STEREO_DOWNMIX },
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{ "2.1", AV_CHANNEL_LAYOUT_2POINT1 },
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{ "3.0", AV_CHANNEL_LAYOUT_SURROUND },
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{ "3.0(back)", AV_CHANNEL_LAYOUT_2_1 },
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{ "4.0", AV_CHANNEL_LAYOUT_4POINT0 },
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{ "quad", AV_CHANNEL_LAYOUT_QUAD },
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{ "quad(side)", AV_CHANNEL_LAYOUT_2_2 },
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{ "3.1", AV_CHANNEL_LAYOUT_3POINT1 },
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{ "5.0", AV_CHANNEL_LAYOUT_5POINT0_BACK },
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{ "5.0(side)", AV_CHANNEL_LAYOUT_5POINT0 },
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{ "4.1", AV_CHANNEL_LAYOUT_4POINT1 },
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{ "5.1", AV_CHANNEL_LAYOUT_5POINT1_BACK },
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{ "5.1(side)", AV_CHANNEL_LAYOUT_5POINT1 },
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{ "6.0", AV_CHANNEL_LAYOUT_6POINT0 },
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{ "6.0(front)", AV_CHANNEL_LAYOUT_6POINT0_FRONT },
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{ "hexagonal", AV_CHANNEL_LAYOUT_HEXAGONAL },
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{ "6.1", AV_CHANNEL_LAYOUT_6POINT1 },
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{ "6.1(back)", AV_CHANNEL_LAYOUT_6POINT1_BACK },
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{ "6.1(front)", AV_CHANNEL_LAYOUT_6POINT1_FRONT },
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{ "7.0", AV_CHANNEL_LAYOUT_7POINT0 },
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{ "7.0(front)", AV_CHANNEL_LAYOUT_7POINT0_FRONT },
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{ "7.1", AV_CHANNEL_LAYOUT_7POINT1 },
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{ "7.1(wide)", AV_CHANNEL_LAYOUT_7POINT1_WIDE_BACK },
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{ "7.1(wide-side)", AV_CHANNEL_LAYOUT_7POINT1_WIDE },
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{ "octagonal", AV_CHANNEL_LAYOUT_OCTAGONAL },
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{ "hexadecagonal", AV_CHANNEL_LAYOUT_HEXADECAGONAL },
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{ "downmix", AV_CHANNEL_LAYOUT_STEREO_DOWNMIX, },
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{ "22.2", AV_CHANNEL_LAYOUT_22POINT2, },
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};
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#if FF_API_OLD_CHANNEL_LAYOUT
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FF_DISABLE_DEPRECATION_WARNINGS
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static uint64_t get_channel_layout_single(const char *name, int name_len)
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{
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int i;
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@@ -123,7 +192,7 @@ static uint64_t get_channel_layout_single(const char *name, int name_len)
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for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) {
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if (strlen(channel_layout_map[i].name) == name_len &&
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!memcmp(channel_layout_map[i].name, name, name_len))
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return channel_layout_map[i].layout;
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return channel_layout_map[i].layout.u.mask;
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}
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for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
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if (channel_names[i].name &&
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@@ -191,8 +260,8 @@ void av_bprint_channel_layout(struct AVBPrint *bp,
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nb_channels = av_get_channel_layout_nb_channels(channel_layout);
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for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
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if (nb_channels == channel_layout_map[i].nb_channels &&
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channel_layout == channel_layout_map[i].layout) {
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if (nb_channels == channel_layout_map[i].layout.nb_channels &&
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channel_layout == channel_layout_map[i].layout.u.mask) {
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av_bprintf(bp, "%s", channel_layout_map[i].name);
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return;
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}
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@@ -233,8 +302,8 @@ int av_get_channel_layout_nb_channels(uint64_t channel_layout)
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int64_t av_get_default_channel_layout(int nb_channels) {
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
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if (nb_channels == channel_layout_map[i].nb_channels)
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return channel_layout_map[i].layout;
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if (nb_channels == channel_layout_map[i].layout.nb_channels)
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return channel_layout_map[i].layout.u.mask;
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return 0;
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}
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@@ -289,7 +358,459 @@ int av_get_standard_channel_layout(unsigned index, uint64_t *layout,
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{
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if (index >= FF_ARRAY_ELEMS(channel_layout_map))
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return AVERROR_EOF;
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if (layout) *layout = channel_layout_map[index].layout;
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if (layout) *layout = channel_layout_map[index].layout.u.mask;
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if (name) *name = channel_layout_map[index].name;
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return 0;
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}
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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int av_channel_layout_from_mask(AVChannelLayout *channel_layout,
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uint64_t mask)
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{
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if (!mask)
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return AVERROR(EINVAL);
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channel_layout->order = AV_CHANNEL_ORDER_NATIVE;
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channel_layout->nb_channels = av_popcount64(mask);
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channel_layout->u.mask = mask;
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return 0;
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}
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int av_channel_layout_from_string(AVChannelLayout *channel_layout,
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const char *str)
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{
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int i;
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int channels = 0, nb_channels = 0, native = 1;
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enum AVChannel highest_channel = AV_CHAN_NONE;
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const char *dup;
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char *chlist, *end;
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uint64_t mask = 0;
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/* channel layout names */
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for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) {
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if (channel_layout_map[i].name && !strcmp(str, channel_layout_map[i].name)) {
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*channel_layout = channel_layout_map[i].layout;
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return 0;
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}
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}
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chlist = av_strdup(str);
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if (!chlist)
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return AVERROR(ENOMEM);
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/* channel names */
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av_sscanf(str, "%d channels (%[^)]", &nb_channels, chlist);
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end = strchr(str, ')');
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dup = chlist;
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while (*dup) {
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char *channel, *chname;
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int ret = av_opt_get_key_value(&dup, "@", "+", AV_OPT_FLAG_IMPLICIT_KEY, &channel, &chname);
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if (ret < 0) {
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av_free(chlist);
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return ret;
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}
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if (*dup)
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dup++; // skip separator
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if (channel && !*channel)
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av_freep(&channel);
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for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) {
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if (channel_names[i].name && !strcmp(channel ? channel : chname, channel_names[i].name)) {
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if (channel || i < highest_channel || mask & (1ULL << i))
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native = 0; // Not a native layout, use a custom one
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highest_channel = i;
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mask |= 1ULL << i;
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break;
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}
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}
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if (!channel && i >= FF_ARRAY_ELEMS(channel_names)) {
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char *endptr = chname;
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enum AVChannel id = AV_CHAN_NONE;
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if (!strncmp(chname, "USR", 3)) {
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const char *p = chname + 3;
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id = strtol(p, &endptr, 0);
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}
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if (id < 0 || *endptr) {
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native = 0; // Unknown channel name
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channels = 0;
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mask = 0;
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av_free(chname);
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break;
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}
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if (id > 63)
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native = 0; // Not a native layout, use a custom one
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else {
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if (id < highest_channel || mask & (1ULL << id))
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native = 0; // Not a native layout, use a custom one
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highest_channel = id;
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mask |= 1ULL << id;
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}
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}
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channels++;
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av_free(channel);
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av_free(chname);
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}
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if (mask && native) {
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av_free(chlist);
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if (nb_channels && ((nb_channels != channels) || (!end || *++end)))
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return AVERROR(EINVAL);
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av_channel_layout_from_mask(channel_layout, mask);
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return 0;
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}
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/* custom layout of channel names */
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if (channels && !native) {
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int idx = 0;
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if (nb_channels && ((nb_channels != channels) || (!end || *++end))) {
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av_free(chlist);
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return AVERROR(EINVAL);
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}
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channel_layout->u.map = av_calloc(channels, sizeof(*channel_layout->u.map));
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if (!channel_layout->u.map) {
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av_free(chlist);
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return AVERROR(ENOMEM);
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}
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channel_layout->order = AV_CHANNEL_ORDER_CUSTOM;
|
||||
channel_layout->nb_channels = channels;
|
||||
|
||||
dup = chlist;
|
||||
while (*dup) {
|
||||
char *channel, *chname;
|
||||
int ret = av_opt_get_key_value(&dup, "@", "+", AV_OPT_FLAG_IMPLICIT_KEY, &channel, &chname);
|
||||
if (ret < 0) {
|
||||
av_freep(&channel_layout->u.map);
|
||||
av_free(chlist);
|
||||
return ret;
|
||||
}
|
||||
if (*dup)
|
||||
dup++; // skip separator
|
||||
for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) {
|
||||
if (channel_names[i].name && !strcmp(channel ? channel : chname, channel_names[i].name)) {
|
||||
channel_layout->u.map[idx].id = i;
|
||||
if (channel)
|
||||
av_strlcpy(channel_layout->u.map[idx].name, chname, sizeof(channel_layout->u.map[idx].name));
|
||||
idx++;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (i >= FF_ARRAY_ELEMS(channel_names)) {
|
||||
const char *p = (channel ? channel : chname) + 3;
|
||||
channel_layout->u.map[idx].id = strtol(p, NULL, 0);
|
||||
if (channel)
|
||||
av_strlcpy(channel_layout->u.map[idx].name, chname, sizeof(channel_layout->u.map[idx].name));
|
||||
idx++;
|
||||
}
|
||||
av_free(channel);
|
||||
av_free(chname);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
av_freep(&chlist);
|
||||
|
||||
errno = 0;
|
||||
mask = strtoull(str, &end, 0);
|
||||
|
||||
/* channel layout mask */
|
||||
if (!errno && !*end && !strchr(str, '-') && mask) {
|
||||
av_channel_layout_from_mask(channel_layout, mask);
|
||||
return 0;
|
||||
}
|
||||
|
||||
errno = 0;
|
||||
channels = strtol(str, &end, 10);
|
||||
|
||||
/* number of channels */
|
||||
if (!errno && !strcmp(end, "c") && channels > 0) {
|
||||
av_channel_layout_default(channel_layout, channels);
|
||||
if (channel_layout->order == AV_CHANNEL_ORDER_NATIVE)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* number of unordered channels */
|
||||
if (!errno && (!strcmp(end, "C") || !strcmp(end, " channels"))
|
||||
&& channels > 0) {
|
||||
channel_layout->order = AV_CHANNEL_ORDER_UNSPEC;
|
||||
channel_layout->nb_channels = channels;
|
||||
return 0;
|
||||
}
|
||||
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
|
||||
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
|
||||
{
|
||||
if (channel_layout->order == AV_CHANNEL_ORDER_CUSTOM)
|
||||
av_freep(&channel_layout->u.map);
|
||||
memset(channel_layout, 0, sizeof(*channel_layout));
|
||||
}
|
||||
|
||||
int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src)
|
||||
{
|
||||
av_channel_layout_uninit(dst);
|
||||
*dst = *src;
|
||||
if (src->order == AV_CHANNEL_ORDER_CUSTOM) {
|
||||
dst->u.map = av_malloc_array(src->nb_channels, sizeof(*dst->u.map));
|
||||
if (!dst->u.map)
|
||||
return AVERROR(ENOMEM);
|
||||
memcpy(dst->u.map, src->u.map, src->nb_channels * sizeof(*src->u.map));
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int av_channel_layout_describe_bprint(const AVChannelLayout *channel_layout,
|
||||
AVBPrint *bp)
|
||||
{
|
||||
int i;
|
||||
|
||||
switch (channel_layout->order) {
|
||||
case AV_CHANNEL_ORDER_NATIVE:
|
||||
for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
|
||||
if (channel_layout->u.mask == channel_layout_map[i].layout.u.mask) {
|
||||
av_bprintf(bp, "%s", channel_layout_map[i].name);
|
||||
return 0;
|
||||
}
|
||||
// fall-through
|
||||
case AV_CHANNEL_ORDER_CUSTOM:
|
||||
if (channel_layout->nb_channels)
|
||||
av_bprintf(bp, "%d channels (", channel_layout->nb_channels);
|
||||
for (i = 0; i < channel_layout->nb_channels; i++) {
|
||||
enum AVChannel ch = av_channel_layout_channel_from_index(channel_layout, i);
|
||||
const char *channel = get_channel_name(ch);
|
||||
|
||||
if (i)
|
||||
av_bprintf(bp, "+");
|
||||
if (channel)
|
||||
av_bprintf(bp, "%s", channel);
|
||||
else
|
||||
av_bprintf(bp, "USR%d", ch);
|
||||
if (channel_layout->order == AV_CHANNEL_ORDER_CUSTOM &&
|
||||
channel_layout->u.map[i].name[0])
|
||||
av_bprintf(bp, "@%s", channel_layout->u.map[i].name);
|
||||
}
|
||||
if (channel_layout->nb_channels) {
|
||||
av_bprintf(bp, ")");
|
||||
return 0;
|
||||
}
|
||||
// fall-through
|
||||
case AV_CHANNEL_ORDER_UNSPEC:
|
||||
av_bprintf(bp, "%d channels", channel_layout->nb_channels);
|
||||
return 0;
|
||||
default:
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
}
|
||||
|
||||
int av_channel_layout_describe(const AVChannelLayout *channel_layout,
|
||||
char *buf, size_t buf_size)
|
||||
{
|
||||
AVBPrint bp;
|
||||
int ret;
|
||||
|
||||
if (!buf && buf_size)
|
||||
return AVERROR(EINVAL);
|
||||
|
||||
av_bprint_init_for_buffer(&bp, buf, buf_size);
|
||||
ret = av_channel_layout_describe_bprint(channel_layout, &bp);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return bp.len;
|
||||
}
|
||||
|
||||
enum AVChannel
|
||||
av_channel_layout_channel_from_index(const AVChannelLayout *channel_layout,
|
||||
unsigned int idx)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (idx >= channel_layout->nb_channels)
|
||||
return AV_CHAN_NONE;
|
||||
|
||||
switch (channel_layout->order) {
|
||||
case AV_CHANNEL_ORDER_CUSTOM:
|
||||
return channel_layout->u.map[idx].id;
|
||||
case AV_CHANNEL_ORDER_NATIVE:
|
||||
for (i = 0; i < 64; i++) {
|
||||
if ((1ULL << i) & channel_layout->u.mask && !idx--)
|
||||
return i;
|
||||
}
|
||||
default:
|
||||
return AV_CHAN_NONE;
|
||||
}
|
||||
}
|
||||
|
||||
enum AVChannel
|
||||
av_channel_layout_channel_from_string(const AVChannelLayout *channel_layout,
|
||||
const char *str)
|
||||
{
|
||||
int index = av_channel_layout_index_from_string(channel_layout, str);
|
||||
|
||||
if (index < 0)
|
||||
return AV_CHAN_NONE;
|
||||
|
||||
return av_channel_layout_channel_from_index(channel_layout, index);
|
||||
}
|
||||
|
||||
int av_channel_layout_index_from_channel(const AVChannelLayout *channel_layout,
|
||||
enum AVChannel channel)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (channel == AV_CHAN_NONE)
|
||||
return AVERROR(EINVAL);
|
||||
|
||||
switch (channel_layout->order) {
|
||||
case AV_CHANNEL_ORDER_CUSTOM:
|
||||
for (i = 0; i < channel_layout->nb_channels; i++)
|
||||
if (channel_layout->u.map[i].id == channel)
|
||||
return i;
|
||||
return AVERROR(EINVAL);
|
||||
case AV_CHANNEL_ORDER_NATIVE: {
|
||||
uint64_t mask = channel_layout->u.mask;
|
||||
if ((unsigned)channel > 63 || !(mask & (1ULL << channel)))
|
||||
return AVERROR(EINVAL);
|
||||
mask &= (1ULL << channel) - 1;
|
||||
return av_popcount64(mask);
|
||||
}
|
||||
default:
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
}
|
||||
|
||||
int av_channel_layout_index_from_string(const AVChannelLayout *channel_layout,
|
||||
const char *str)
|
||||
{
|
||||
char *chname;
|
||||
enum AVChannel ch = AV_CHAN_NONE;
|
||||
|
||||
switch (channel_layout->order) {
|
||||
case AV_CHANNEL_ORDER_CUSTOM:
|
||||
chname = strstr(str, "@");
|
||||
if (chname) {
|
||||
char buf[16];
|
||||
chname++;
|
||||
av_strlcpy(buf, str, FFMIN(sizeof(buf), chname - str));
|
||||
if (!*chname)
|
||||
chname = NULL;
|
||||
ch = av_channel_from_string(buf);
|
||||
if (ch == AV_CHAN_NONE && *buf)
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
for (int i = 0; chname && i < channel_layout->nb_channels; i++) {
|
||||
if (!strcmp(chname, channel_layout->u.map[i].name) &&
|
||||
(ch == AV_CHAN_NONE || ch == channel_layout->u.map[i].id))
|
||||
return i;
|
||||
}
|
||||
// fall-through
|
||||
case AV_CHANNEL_ORDER_NATIVE:
|
||||
ch = av_channel_from_string(str);
|
||||
if (ch == AV_CHAN_NONE)
|
||||
return AVERROR(EINVAL);
|
||||
return av_channel_layout_index_from_channel(channel_layout, ch);
|
||||
}
|
||||
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
|
||||
int av_channel_layout_check(const AVChannelLayout *channel_layout)
|
||||
{
|
||||
if (channel_layout->nb_channels <= 0)
|
||||
return 0;
|
||||
|
||||
switch (channel_layout->order) {
|
||||
case AV_CHANNEL_ORDER_NATIVE:
|
||||
return av_popcount64(channel_layout->u.mask) == channel_layout->nb_channels;
|
||||
case AV_CHANNEL_ORDER_CUSTOM:
|
||||
if (!channel_layout->u.map)
|
||||
return 0;
|
||||
for (int i = 0; i < channel_layout->nb_channels; i++) {
|
||||
if (channel_layout->u.map[i].id == AV_CHAN_NONE)
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
case AV_CHANNEL_ORDER_UNSPEC:
|
||||
return 1;
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
int av_channel_layout_compare(const AVChannelLayout *chl, const AVChannelLayout *chl1)
|
||||
{
|
||||
int i;
|
||||
|
||||
/* different channel counts -> not equal */
|
||||
if (chl->nb_channels != chl1->nb_channels)
|
||||
return 1;
|
||||
|
||||
/* if only one is unspecified -> not equal */
|
||||
if ((chl->order == AV_CHANNEL_ORDER_UNSPEC) !=
|
||||
(chl1->order == AV_CHANNEL_ORDER_UNSPEC))
|
||||
return 1;
|
||||
/* both are unspecified -> equal */
|
||||
else if (chl->order == AV_CHANNEL_ORDER_UNSPEC)
|
||||
return 0;
|
||||
|
||||
/* can compare masks directly */
|
||||
if (chl->order != AV_CHANNEL_ORDER_CUSTOM &&
|
||||
chl->order == chl1->order)
|
||||
return chl->u.mask != chl1->u.mask;
|
||||
|
||||
/* compare channel by channel */
|
||||
for (i = 0; i < chl->nb_channels; i++)
|
||||
if (av_channel_layout_channel_from_index(chl, i) !=
|
||||
av_channel_layout_channel_from_index(chl1, i))
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
|
||||
if (nb_channels == channel_layout_map[i].layout.nb_channels) {
|
||||
*ch_layout = channel_layout_map[i].layout;
|
||||
return;
|
||||
}
|
||||
|
||||
ch_layout->order = AV_CHANNEL_ORDER_UNSPEC;
|
||||
ch_layout->nb_channels = nb_channels;
|
||||
}
|
||||
|
||||
const AVChannelLayout *av_channel_layout_standard(void **opaque)
|
||||
{
|
||||
uintptr_t i = (uintptr_t)*opaque;
|
||||
const AVChannelLayout *ch_layout = NULL;
|
||||
|
||||
if (i < FF_ARRAY_ELEMS(channel_layout_map)) {
|
||||
ch_layout = &channel_layout_map[i].layout;
|
||||
*opaque = (void*)(i + 1);
|
||||
}
|
||||
|
||||
return ch_layout;
|
||||
}
|
||||
|
||||
uint64_t av_channel_layout_subset(const AVChannelLayout *channel_layout,
|
||||
uint64_t mask)
|
||||
{
|
||||
uint64_t ret = 0;
|
||||
int i;
|
||||
|
||||
if (channel_layout->order == AV_CHANNEL_ORDER_NATIVE)
|
||||
return channel_layout->u.mask & mask;
|
||||
|
||||
for (i = 0; i < 64; i++)
|
||||
if (mask & (1ULL << i) && av_channel_layout_index_from_channel(channel_layout, i) >= 0)
|
||||
ret |= (1ULL << i);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user