diff options
Diffstat (limited to 'setup.c')
| -rw-r--r-- | setup.c | 43 |
1 files changed, 43 insertions, 0 deletions
@@ -226,6 +226,49 @@ int cRpiSetup::GetDisplaySize(int &width, int &height, double &aspect) return 0; } +void cRpiSetup::SetHDMIChannelMapping(bool passthrough, int channels) +{ + char command[80], response[80]; + + sprintf(command, "hdmi_stream_channels %d", passthrough ? 1 : 0); + vc_gencmd(response, sizeof response, command); + + uint32_t channel_map = 0; + + if (!passthrough && channels > 0 && channels <= 6) + { + const unsigned char ch_mapping[6][8] = + { + { 0, 0, 0, 0, 0, 0, 0, 0 }, // not supported + { 1, 2, 0, 0, 0, 0, 0, 0 }, // 2.0 + { 1, 2, 4, 0, 0, 0, 0, 0 }, // 2.1 + { 0, 0, 0, 0, 0, 0, 0, 0 }, // not supported + { 0, 0, 0, 0, 0, 0, 0, 0 }, // not supported + { 1, 2, 4, 3, 5, 6, 0, 0 }, // 5.1 + }; + + // speaker layout according CEA 861, Table 28: Audio InfoFrame, byte 4 + const unsigned char cea_map[] = + { + 0xff, // not supported + 0x00, // 2.0 + 0x01, // 2.1 + 0xff, // not supported + 0xff, // not supported + 0x0b // 5.1 + }; + + for (int ch = 0; ch < channels; ch++) + if (ch_mapping[channels - 1][ch]) + channel_map |= (ch_mapping[channels - 1][ch] - 1) << (3 * ch); + + channel_map |= cea_map[channels - 1] << 24; + } + + sprintf(command, "hdmi_channel_map 0x%08x", channel_map); + vc_gencmd(response, sizeof response, command); +} + cMenuSetupPage* cRpiSetup::GetSetupPage(void) { return new cRpiSetupPage(m_audio, m_video); |