mirror of https://github.com/mpv-player/mpv
108 lines
2.8 KiB
C
108 lines
2.8 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 <stdlib.h>
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#include <assert.h>
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#include "af.h"
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#include "audio/format.h"
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#include "osdep/endian.h"
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static bool test_conversion(int src_format, int dst_format)
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{
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if ((src_format & AF_FORMAT_PLANAR) ||
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(dst_format & AF_FORMAT_PLANAR))
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return false;
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if (((src_format & ~AF_FORMAT_SIGN_MASK) ==
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(dst_format & ~AF_FORMAT_SIGN_MASK)) &&
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((src_format & AF_FORMAT_TYPE_MASK) == AF_FORMAT_I))
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return true;
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return false;
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}
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static int control(struct af_instance *af, int cmd, void *arg)
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{
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switch (cmd) {
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case AF_CONTROL_REINIT: {
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struct mp_audio *in = arg;
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struct mp_audio orig_in = *in;
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struct mp_audio *out = af->data;
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if (!test_conversion(in->format, out->format))
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return AF_DETACH;
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out->rate = in->rate;
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mp_audio_set_channels(out, &in->channels);
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return mp_audio_config_equals(in, &orig_in) ? AF_OK : AF_FALSE;
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}
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case AF_CONTROL_SET_FORMAT: {
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mp_audio_set_format(af->data, *(int*)arg);
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return AF_OK;
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}
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}
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return AF_UNKNOWN;
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}
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static void si2us(void *data, int len, int bps)
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{
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ptrdiff_t i = -(len * bps);
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uint8_t *p = &((uint8_t *)data)[len * bps];
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if (BYTE_ORDER == LITTLE_ENDIAN && bps > 1)
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p += bps - 1;
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if (len <= 0)
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return;
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do {
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p[i] ^= 0x80;
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} while (i += bps);
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}
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static int filter(struct af_instance *af, struct mp_audio *data)
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{
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if (!data)
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return 0;
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if (af_make_writeable(af, data) < 0) {
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talloc_free(data);
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return -1;
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}
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int infmt = data->format;
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int outfmt = af->data->format;
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size_t len = data->samples * data->nch;
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if ((infmt & AF_FORMAT_SIGN_MASK) != (outfmt & AF_FORMAT_SIGN_MASK))
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si2us(data->planes[0], len, data->bps);
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mp_audio_set_format(data, outfmt);
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af_add_output_frame(af, data);
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return 0;
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}
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static int af_open(struct af_instance *af)
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{
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af->control = control;
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af->filter_frame = filter;
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return AF_OK;
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}
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const struct af_info af_info_convertsignendian = {
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.info = "Convert between sample format sign",
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.name = "convertsign",
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.open = af_open,
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.test_conversion = test_conversion,
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};
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