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Diffstat (limited to 'libhb/audio_remap.c')
| -rw-r--r-- | libhb/audio_remap.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/libhb/audio_remap.c b/libhb/audio_remap.c new file mode 100644 index 000000000..6d3877d3d --- /dev/null +++ b/libhb/audio_remap.c @@ -0,0 +1,148 @@ +/* audio_remap.c + * + * Copyright (c) 2003-2012 HandBrake Team + * This file is part of the HandBrake source code + * Homepage: <http://handbrake.fr/> + * It may be used under the terms of the GNU General Public License v2. + * For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html + */ + +#include "common.h" +#include "hbffmpeg.h" +#include "audio_remap.h" + +// source: libavutil/audioconvert.h +hb_chan_map_t hb_libav_chan_map = +{ + { + AV_CH_FRONT_LEFT, + AV_CH_FRONT_RIGHT, + AV_CH_FRONT_CENTER, + AV_CH_LOW_FREQUENCY, + AV_CH_BACK_LEFT, + AV_CH_BACK_RIGHT, + AV_CH_FRONT_LEFT_OF_CENTER, + AV_CH_FRONT_RIGHT_OF_CENTER, + AV_CH_BACK_CENTER, + AV_CH_SIDE_LEFT, + AV_CH_SIDE_RIGHT, + 0 + } +}; + +// source: liba52 documentation +hb_chan_map_t hb_liba52_chan_map = +{ + { + AV_CH_LOW_FREQUENCY, + AV_CH_FRONT_LEFT, + AV_CH_FRONT_CENTER, + AV_CH_FRONT_RIGHT, + AV_CH_BACK_CENTER, + AV_CH_SIDE_LEFT, + AV_CH_SIDE_RIGHT, + 0 + } +}; + +// source: libdca documentation and libavcodec/dca.c +hb_chan_map_t hb_libdca_chan_map = +{ + { + AV_CH_FRONT_LEFT_OF_CENTER, + AV_CH_FRONT_CENTER, + AV_CH_FRONT_RIGHT_OF_CENTER, + AV_CH_FRONT_LEFT, + AV_CH_FRONT_RIGHT, + AV_CH_SIDE_LEFT, + AV_CH_SIDE_RIGHT, + AV_CH_LOW_FREQUENCY, + 0 + } +}; + +// source: http://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9 +hb_chan_map_t hb_vorbis_chan_map = +{ + { + AV_CH_FRONT_LEFT, + AV_CH_FRONT_CENTER, + AV_CH_FRONT_RIGHT, + AV_CH_SIDE_LEFT, + AV_CH_SIDE_RIGHT, + AV_CH_BACK_LEFT, + AV_CH_BACK_CENTER, + AV_CH_BACK_RIGHT, + AV_CH_LOW_FREQUENCY, + 0 + } +}; + +// source: https://developer.apple.com/library/mac/#documentation/musicaudio/reference/CoreAudioDataTypesRef/Reference/reference.html +hb_chan_map_t hb_aac_chan_map = +{ + { + AV_CH_FRONT_CENTER, + AV_CH_FRONT_LEFT_OF_CENTER, + AV_CH_FRONT_RIGHT_OF_CENTER, + AV_CH_FRONT_LEFT, + AV_CH_FRONT_RIGHT, + AV_CH_SIDE_LEFT, + AV_CH_SIDE_RIGHT, + AV_CH_BACK_LEFT, + AV_CH_BACK_RIGHT, + AV_CH_BACK_CENTER, + AV_CH_LOW_FREQUENCY, + 0 + } +}; + +int* hb_audio_remap_build_table(uint64_t layout, hb_chan_map_t *map_in, hb_chan_map_t *map_out) +{ + int ii, jj, idx, remap_idx, *remap_table; + uint64_t *input_order, *output_order; + + remap_table = calloc(HB_AUDIO_REMAP_MAX_CHANNELS, sizeof(int)); + if (!remap_table) + return NULL; + + idx = 0; + input_order = map_in->channel_order; + output_order = map_out->channel_order; + for (ii = 0; output_order[ii]; ii++) + { + if (layout & output_order[ii]) + { + remap_idx = 0; + for (jj = 0; input_order[jj]; jj++) + { + if (output_order[ii] == input_order[jj]) + { + remap_table[idx++] = remap_idx++; + } + else if (layout & input_order[jj]) + { + remap_idx++; + } + } + } + } + + return remap_table; +} + +void hb_audio_remap(int nchannels, int nsamples, hb_sample_t *samples, int *remap_table) +{ + int ii, jj; + hb_sample_t tmp[HB_AUDIO_REMAP_MAX_CHANNELS]; + + for (ii = 0; ii < nsamples; ii++) + { + memcpy(tmp, samples, nchannels * sizeof(hb_sample_t)); + for (jj = 0; jj < nchannels; jj++) + { + samples[jj] = tmp[remap_table[jj]]; + } + samples += nchannels; + } +}
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