mirror of
https://github.com/mpv-player/mpv
synced 2024-12-20 22:02:59 +00:00
d2e7467eb2
Based on earlier work by Stefano Pigozzi. There are 2 changes: 1. Instead of mp_audio.audio, mp_audio.planes[0] must be used. 2. mp_audio.len used to contain the size of the audio in bytes. Now mp_audio.samples must be used. (Where 1 sample is the smallest unit of audio that covers all channels.) Also, some filters need changes to reject non-interleaved formats properly. Nothing uses the non-interleaved features yet, but this is needed so that things don't just break when doing so.
203 lines
6.3 KiB
C
203 lines
6.3 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include "mpvcore/mp_common.h"
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#include "mpvcore/mp_talloc.h"
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#include "audio.h"
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static void update_redundant_info(struct mp_audio *mpa)
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{
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assert(mp_chmap_is_empty(&mpa->channels) ||
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mp_chmap_is_valid(&mpa->channels));
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mpa->nch = mpa->channels.num;
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mpa->bps = af_fmt2bits(mpa->format) / 8;
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if (af_fmt_is_planar(mpa->format)) {
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mpa->spf = 1;
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mpa->num_planes = mpa->nch;
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mpa->sstride = mpa->bps;
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} else {
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mpa->spf = mpa->nch;
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mpa->num_planes = 1;
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mpa->sstride = mpa->bps * mpa->nch;
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}
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}
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void mp_audio_set_format(struct mp_audio *mpa, int format)
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{
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mpa->format = format;
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update_redundant_info(mpa);
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}
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void mp_audio_set_num_channels(struct mp_audio *mpa, int num_channels)
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{
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mp_chmap_from_channels(&mpa->channels, num_channels);
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update_redundant_info(mpa);
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}
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// Use old MPlayer/ALSA channel layout.
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void mp_audio_set_channels_old(struct mp_audio *mpa, int num_channels)
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{
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mp_chmap_from_channels_alsa(&mpa->channels, num_channels);
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update_redundant_info(mpa);
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}
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void mp_audio_set_channels(struct mp_audio *mpa, const struct mp_chmap *chmap)
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{
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mpa->channels = *chmap;
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update_redundant_info(mpa);
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}
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void mp_audio_copy_config(struct mp_audio *dst, const struct mp_audio *src)
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{
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dst->format = src->format;
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dst->channels = src->channels;
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dst->rate = src->rate;
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update_redundant_info(dst);
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}
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bool mp_audio_config_equals(const struct mp_audio *a, const struct mp_audio *b)
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{
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return a->format == b->format && a->rate == b->rate &&
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mp_chmap_equals(&a->channels, &b->channels);
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}
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char *mp_audio_fmt_to_str(int srate, const struct mp_chmap *chmap, int format)
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{
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char *chstr = mp_chmap_to_str(chmap);
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char *res = talloc_asprintf(NULL, "%dHz %s %dch %s", srate, chstr,
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chmap->num, af_fmt_to_str(format));
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talloc_free(chstr);
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return res;
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}
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char *mp_audio_config_to_str(struct mp_audio *mpa)
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{
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return mp_audio_fmt_to_str(mpa->rate, &mpa->channels, mpa->format);
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}
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void mp_audio_force_interleaved_format(struct mp_audio *mpa)
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{
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if (af_fmt_is_planar(mpa->format))
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mp_audio_set_format(mpa, af_fmt_from_planar(mpa->format));
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}
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// Return used size of a plane. (The size is the same for all planes.)
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int mp_audio_psize(struct mp_audio *mpa)
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{
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return mpa->samples * mpa->sstride;
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}
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void mp_audio_set_null_data(struct mp_audio *mpa)
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{
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for (int n = 0; n < MP_NUM_CHANNELS; n++)
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mpa->planes[n] = NULL;
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mpa->samples = 0;
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}
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/* Reallocate the data stored in mpa->planes[n] so that enough samples are
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* available on every plane. The previous data is kept (for the smallest
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* common number of samples before/after resize).
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*
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* mpa->samples is not set or used.
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*
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* This function is flexible enough to handle format and channel layout
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* changes. In these cases, all planes are reallocated as needed. Unused
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* planes are freed.
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*
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* mp_audio_realloc(mpa, 0) will still yield non-NULL for mpa->data[n].
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*
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* Allocated data is implicitly freed on talloc_free(mpa).
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*/
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void mp_audio_realloc(struct mp_audio *mpa, int samples)
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{
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assert(samples >= 0);
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int size = MPMAX(samples * mpa->sstride, 1);
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for (int n = 0; n < mpa->num_planes; n++) {
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mpa->planes[n] = talloc_realloc_size(mpa, mpa->planes[n], size);
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}
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for (int n = mpa->num_planes; n < MP_NUM_CHANNELS; n++) {
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talloc_free(mpa->planes[n]);
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mpa->planes[n] = NULL;
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}
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}
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// Like mp_audio_realloc(), but only reallocate if the audio grows in size.
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void mp_audio_realloc_min(struct mp_audio *mpa, int samples)
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{
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if (samples > mp_audio_get_allocated_size(mpa))
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mp_audio_realloc(mpa, samples);
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}
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/* Get the size allocated for the data, in number of samples. If the allocated
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* size isn't on sample boundaries (e.g. after format changes), the returned
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* sample number is a rounded down value.
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*
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* Note that this only works in situations where mp_audio_realloc() also works!
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*/
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int mp_audio_get_allocated_size(struct mp_audio *mpa)
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{
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int size = 0;
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for (int n = 0; n < mpa->num_planes; n++) {
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int s = talloc_get_size(mpa->planes[n]) / mpa->sstride;
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size = n == 0 ? s : MPMIN(size, s);
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}
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return size;
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}
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// Clear the samples [start, start + length) with silence.
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void mp_audio_fill_silence(struct mp_audio *mpa, int start, int length)
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{
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assert(start >= 0 && length >= 0 && start + length <= mpa->samples);
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int offset = start * mpa->sstride;
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int size = length * mpa->sstride;
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for (int n = 0; n < mpa->num_planes; n++) {
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if (n > 0 && mpa->planes[n] == mpa->planes[0])
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continue; // silly optimization for special cases
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af_fill_silence((char *)mpa->planes[n] + offset, size, mpa->format);
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}
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}
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// All integer parameters are in samples.
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// dst and src can overlap.
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void mp_audio_copy(struct mp_audio *dst, int dst_offset,
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struct mp_audio *src, int src_offset, int length)
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{
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assert(mp_audio_config_equals(dst, src));
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assert(length >= 0);
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assert(dst_offset >= 0 && dst_offset + length <= dst->samples);
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assert(src_offset >= 0 && src_offset + length <= src->samples);
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for (int n = 0; n < dst->num_planes; n++) {
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memmove((char *)dst->planes[n] + dst_offset * dst->sstride,
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(char *)src->planes[n] + src_offset * src->sstride,
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length * dst->sstride);
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}
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}
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// Set data to the audio after the given number of samples (i.e. slice it).
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void mp_audio_skip_samples(struct mp_audio *data, int samples)
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{
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assert(samples >= 0 && samples <= data->samples);
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for (int n = 0; n < data->num_planes; n++)
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data->planes[n] = (uint8_t *)data->planes[n] + samples * data->sstride;
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data->samples -= samples;
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}
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