| 12 | #include "handbrake/audio_resample.h" |
| 13 | |
| 14 | hb_audio_resample_t* hb_audio_resample_init(enum AVSampleFormat sample_fmt, |
| 15 | int sample_rate, |
| 16 | int hb_amixdown, int normalize_mix) |
| 17 | { |
| 18 | hb_audio_resample_t *resample = calloc(1, sizeof(hb_audio_resample_t)); |
| 19 | if (resample == NULL) |
| 20 | { |
| 21 | hb_error("hb_audio_resample_init: failed to allocate resample"); |
| 22 | goto fail; |
| 23 | } |
| 24 | |
| 25 | // swresample context, initialized in hb_audio_resample_update() |
| 26 | resample->swresample = NULL; |
| 27 | |
| 28 | // we don't support planar output yet |
| 29 | if (av_sample_fmt_is_planar(sample_fmt)) |
| 30 | { |
| 31 | hb_error("hb_audio_resample_init: planar output not supported ('%s')", |
| 32 | av_get_sample_fmt_name(sample_fmt)); |
| 33 | goto fail; |
| 34 | } |
| 35 | |
| 36 | // convert mixdown to channel_layout/matrix_encoding combo |
| 37 | int matrix_encoding; |
| 38 | uint64_t channel_layout = hb_ff_mixdown_xlat(hb_amixdown, &matrix_encoding); |
| 39 | |
| 40 | /* |
| 41 | * When downmixing, Dual Mono to Mono is a special case: |
| 42 | * the audio must remain 2-channel until all conversions are done. |
| 43 | */ |
| 44 | if (hb_amixdown == HB_AMIXDOWN_LEFT || hb_amixdown == HB_AMIXDOWN_RIGHT) |
| 45 | { |
| 46 | channel_layout = AV_CH_LAYOUT_STEREO; |
| 47 | resample->dual_mono_downmix = 1; |
| 48 | resample->dual_mono_right_only = (hb_amixdown == HB_AMIXDOWN_RIGHT); |
| 49 | } |
| 50 | else |
| 51 | { |
| 52 | resample->dual_mono_downmix = 0; |
| 53 | } |
| 54 | |
| 55 | // requested output channel_layout, sample_fmt |
| 56 | av_channel_layout_from_mask(&resample->out.ch_layout, channel_layout); |
| 57 | resample->out.matrix_encoding = matrix_encoding; |
| 58 | resample->out.sample_fmt = sample_fmt; |
| 59 | resample->out.sample_rate = sample_rate; |
| 60 | if (normalize_mix) |
| 61 | { |
| 62 | resample->out.maxval = 1.0; |
| 63 | } |
| 64 | else |
| 65 | { |
| 66 | resample->out.maxval = 1000; |
| 67 | } |
| 68 | resample->out.sample_size = av_get_bytes_per_sample(sample_fmt); |
| 69 | |
| 70 | // set default input characteristics |
| 71 | resample->in.sample_fmt = resample->out.sample_fmt; |
no test coverage detected