mirror of https://git.ffmpeg.org/ffmpeg.git
647 lines
24 KiB
C
647 lines
24 KiB
C
/*
|
|
* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/dict.h"
|
|
#include "libavutil/error.h"
|
|
#include "libavutil/log.h"
|
|
#include "libavutil/mem.h"
|
|
#include "libavutil/opt.h"
|
|
|
|
#include "avresample.h"
|
|
#include "internal.h"
|
|
#include "audio_data.h"
|
|
#include "audio_convert.h"
|
|
#include "audio_mix.h"
|
|
#include "resample.h"
|
|
|
|
int avresample_open(AVAudioResampleContext *avr)
|
|
{
|
|
int ret;
|
|
|
|
if (avresample_is_open(avr)) {
|
|
av_log(avr, AV_LOG_ERROR, "The resampling context is already open.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
/* set channel mixing parameters */
|
|
avr->in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout);
|
|
if (avr->in_channels <= 0 || avr->in_channels > AVRESAMPLE_MAX_CHANNELS) {
|
|
av_log(avr, AV_LOG_ERROR, "Invalid input channel layout: %"PRIu64"\n",
|
|
avr->in_channel_layout);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
avr->out_channels = av_get_channel_layout_nb_channels(avr->out_channel_layout);
|
|
if (avr->out_channels <= 0 || avr->out_channels > AVRESAMPLE_MAX_CHANNELS) {
|
|
av_log(avr, AV_LOG_ERROR, "Invalid output channel layout: %"PRIu64"\n",
|
|
avr->out_channel_layout);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
avr->resample_channels = FFMIN(avr->in_channels, avr->out_channels);
|
|
avr->downmix_needed = avr->in_channels > avr->out_channels;
|
|
avr->upmix_needed = avr->out_channels > avr->in_channels ||
|
|
(!avr->downmix_needed && (avr->mix_matrix ||
|
|
avr->in_channel_layout != avr->out_channel_layout));
|
|
avr->mixing_needed = avr->downmix_needed || avr->upmix_needed;
|
|
|
|
/* set resampling parameters */
|
|
avr->resample_needed = avr->in_sample_rate != avr->out_sample_rate ||
|
|
avr->force_resampling;
|
|
|
|
/* select internal sample format if not specified by the user */
|
|
if (avr->internal_sample_fmt == AV_SAMPLE_FMT_NONE &&
|
|
(avr->mixing_needed || avr->resample_needed)) {
|
|
enum AVSampleFormat in_fmt = av_get_planar_sample_fmt(avr->in_sample_fmt);
|
|
enum AVSampleFormat out_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt);
|
|
int max_bps = FFMAX(av_get_bytes_per_sample(in_fmt),
|
|
av_get_bytes_per_sample(out_fmt));
|
|
if (max_bps <= 2) {
|
|
avr->internal_sample_fmt = AV_SAMPLE_FMT_S16P;
|
|
} else if (avr->mixing_needed) {
|
|
avr->internal_sample_fmt = AV_SAMPLE_FMT_FLTP;
|
|
} else {
|
|
if (max_bps <= 4) {
|
|
if (in_fmt == AV_SAMPLE_FMT_S32P ||
|
|
out_fmt == AV_SAMPLE_FMT_S32P) {
|
|
if (in_fmt == AV_SAMPLE_FMT_FLTP ||
|
|
out_fmt == AV_SAMPLE_FMT_FLTP) {
|
|
/* if one is s32 and the other is flt, use dbl */
|
|
avr->internal_sample_fmt = AV_SAMPLE_FMT_DBLP;
|
|
} else {
|
|
/* if one is s32 and the other is s32, s16, or u8, use s32 */
|
|
avr->internal_sample_fmt = AV_SAMPLE_FMT_S32P;
|
|
}
|
|
} else {
|
|
/* if one is flt and the other is flt, s16 or u8, use flt */
|
|
avr->internal_sample_fmt = AV_SAMPLE_FMT_FLTP;
|
|
}
|
|
} else {
|
|
/* if either is dbl, use dbl */
|
|
avr->internal_sample_fmt = AV_SAMPLE_FMT_DBLP;
|
|
}
|
|
}
|
|
av_log(avr, AV_LOG_DEBUG, "Using %s as internal sample format\n",
|
|
av_get_sample_fmt_name(avr->internal_sample_fmt));
|
|
}
|
|
|
|
/* treat all mono as planar for easier comparison */
|
|
if (avr->in_channels == 1)
|
|
avr->in_sample_fmt = av_get_planar_sample_fmt(avr->in_sample_fmt);
|
|
if (avr->out_channels == 1)
|
|
avr->out_sample_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt);
|
|
|
|
/* we may need to add an extra conversion in order to remap channels if
|
|
the output format is not planar */
|
|
if (avr->use_channel_map && !avr->mixing_needed && !avr->resample_needed &&
|
|
!av_sample_fmt_is_planar(avr->out_sample_fmt)) {
|
|
avr->internal_sample_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt);
|
|
}
|
|
|
|
/* set sample format conversion parameters */
|
|
if (avr->resample_needed || avr->mixing_needed)
|
|
avr->in_convert_needed = avr->in_sample_fmt != avr->internal_sample_fmt;
|
|
else
|
|
avr->in_convert_needed = avr->use_channel_map &&
|
|
!av_sample_fmt_is_planar(avr->out_sample_fmt);
|
|
|
|
if (avr->resample_needed || avr->mixing_needed || avr->in_convert_needed)
|
|
avr->out_convert_needed = avr->internal_sample_fmt != avr->out_sample_fmt;
|
|
else
|
|
avr->out_convert_needed = avr->in_sample_fmt != avr->out_sample_fmt;
|
|
|
|
avr->in_copy_needed = !avr->in_convert_needed && (avr->mixing_needed ||
|
|
(avr->use_channel_map && avr->resample_needed));
|
|
|
|
if (avr->use_channel_map) {
|
|
if (avr->in_copy_needed) {
|
|
avr->remap_point = REMAP_IN_COPY;
|
|
av_dlog(avr, "remap channels during in_copy\n");
|
|
} else if (avr->in_convert_needed) {
|
|
avr->remap_point = REMAP_IN_CONVERT;
|
|
av_dlog(avr, "remap channels during in_convert\n");
|
|
} else if (avr->out_convert_needed) {
|
|
avr->remap_point = REMAP_OUT_CONVERT;
|
|
av_dlog(avr, "remap channels during out_convert\n");
|
|
} else {
|
|
avr->remap_point = REMAP_OUT_COPY;
|
|
av_dlog(avr, "remap channels during out_copy\n");
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
{
|
|
int ch;
|
|
av_dlog(avr, "output map: ");
|
|
if (avr->ch_map_info.do_remap)
|
|
for (ch = 0; ch < avr->in_channels; ch++)
|
|
av_dlog(avr, " % 2d", avr->ch_map_info.channel_map[ch]);
|
|
else
|
|
av_dlog(avr, "n/a");
|
|
av_dlog(avr, "\n");
|
|
av_dlog(avr, "copy map: ");
|
|
if (avr->ch_map_info.do_copy)
|
|
for (ch = 0; ch < avr->in_channels; ch++)
|
|
av_dlog(avr, " % 2d", avr->ch_map_info.channel_copy[ch]);
|
|
else
|
|
av_dlog(avr, "n/a");
|
|
av_dlog(avr, "\n");
|
|
av_dlog(avr, "zero map: ");
|
|
if (avr->ch_map_info.do_zero)
|
|
for (ch = 0; ch < avr->in_channels; ch++)
|
|
av_dlog(avr, " % 2d", avr->ch_map_info.channel_zero[ch]);
|
|
else
|
|
av_dlog(avr, "n/a");
|
|
av_dlog(avr, "\n");
|
|
av_dlog(avr, "input map: ");
|
|
for (ch = 0; ch < avr->in_channels; ch++)
|
|
av_dlog(avr, " % 2d", avr->ch_map_info.input_map[ch]);
|
|
av_dlog(avr, "\n");
|
|
}
|
|
#endif
|
|
} else
|
|
avr->remap_point = REMAP_NONE;
|
|
|
|
/* allocate buffers */
|
|
if (avr->in_copy_needed || avr->in_convert_needed) {
|
|
avr->in_buffer = ff_audio_data_alloc(FFMAX(avr->in_channels, avr->out_channels),
|
|
0, avr->internal_sample_fmt,
|
|
"in_buffer");
|
|
if (!avr->in_buffer) {
|
|
ret = AVERROR(EINVAL);
|
|
goto error;
|
|
}
|
|
}
|
|
if (avr->resample_needed) {
|
|
avr->resample_out_buffer = ff_audio_data_alloc(avr->out_channels,
|
|
0, avr->internal_sample_fmt,
|
|
"resample_out_buffer");
|
|
if (!avr->resample_out_buffer) {
|
|
ret = AVERROR(EINVAL);
|
|
goto error;
|
|
}
|
|
}
|
|
if (avr->out_convert_needed) {
|
|
avr->out_buffer = ff_audio_data_alloc(avr->out_channels, 0,
|
|
avr->out_sample_fmt, "out_buffer");
|
|
if (!avr->out_buffer) {
|
|
ret = AVERROR(EINVAL);
|
|
goto error;
|
|
}
|
|
}
|
|
avr->out_fifo = av_audio_fifo_alloc(avr->out_sample_fmt, avr->out_channels,
|
|
1024);
|
|
if (!avr->out_fifo) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto error;
|
|
}
|
|
|
|
/* setup contexts */
|
|
if (avr->in_convert_needed) {
|
|
avr->ac_in = ff_audio_convert_alloc(avr, avr->internal_sample_fmt,
|
|
avr->in_sample_fmt, avr->in_channels,
|
|
avr->in_sample_rate,
|
|
avr->remap_point == REMAP_IN_CONVERT);
|
|
if (!avr->ac_in) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto error;
|
|
}
|
|
}
|
|
if (avr->out_convert_needed) {
|
|
enum AVSampleFormat src_fmt;
|
|
if (avr->in_convert_needed)
|
|
src_fmt = avr->internal_sample_fmt;
|
|
else
|
|
src_fmt = avr->in_sample_fmt;
|
|
avr->ac_out = ff_audio_convert_alloc(avr, avr->out_sample_fmt, src_fmt,
|
|
avr->out_channels,
|
|
avr->out_sample_rate,
|
|
avr->remap_point == REMAP_OUT_CONVERT);
|
|
if (!avr->ac_out) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto error;
|
|
}
|
|
}
|
|
if (avr->resample_needed) {
|
|
avr->resample = ff_audio_resample_init(avr);
|
|
if (!avr->resample) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto error;
|
|
}
|
|
}
|
|
if (avr->mixing_needed) {
|
|
avr->am = ff_audio_mix_alloc(avr);
|
|
if (!avr->am) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
avresample_close(avr);
|
|
return ret;
|
|
}
|
|
|
|
int avresample_is_open(AVAudioResampleContext *avr)
|
|
{
|
|
return !!avr->out_fifo;
|
|
}
|
|
|
|
void avresample_close(AVAudioResampleContext *avr)
|
|
{
|
|
ff_audio_data_free(&avr->in_buffer);
|
|
ff_audio_data_free(&avr->resample_out_buffer);
|
|
ff_audio_data_free(&avr->out_buffer);
|
|
av_audio_fifo_free(avr->out_fifo);
|
|
avr->out_fifo = NULL;
|
|
ff_audio_convert_free(&avr->ac_in);
|
|
ff_audio_convert_free(&avr->ac_out);
|
|
ff_audio_resample_free(&avr->resample);
|
|
ff_audio_mix_free(&avr->am);
|
|
av_freep(&avr->mix_matrix);
|
|
|
|
avr->use_channel_map = 0;
|
|
}
|
|
|
|
void avresample_free(AVAudioResampleContext **avr)
|
|
{
|
|
if (!*avr)
|
|
return;
|
|
avresample_close(*avr);
|
|
av_opt_free(*avr);
|
|
av_freep(avr);
|
|
}
|
|
|
|
static int handle_buffered_output(AVAudioResampleContext *avr,
|
|
AudioData *output, AudioData *converted)
|
|
{
|
|
int ret;
|
|
|
|
if (!output || av_audio_fifo_size(avr->out_fifo) > 0 ||
|
|
(converted && output->allocated_samples < converted->nb_samples)) {
|
|
if (converted) {
|
|
/* if there are any samples in the output FIFO or if the
|
|
user-supplied output buffer is not large enough for all samples,
|
|
we add to the output FIFO */
|
|
av_dlog(avr, "[FIFO] add %s to out_fifo\n", converted->name);
|
|
ret = ff_audio_data_add_to_fifo(avr->out_fifo, converted, 0,
|
|
converted->nb_samples);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
/* if the user specified an output buffer, read samples from the output
|
|
FIFO to the user output */
|
|
if (output && output->allocated_samples > 0) {
|
|
av_dlog(avr, "[FIFO] read from out_fifo to output\n");
|
|
av_dlog(avr, "[end conversion]\n");
|
|
return ff_audio_data_read_from_fifo(avr->out_fifo, output,
|
|
output->allocated_samples);
|
|
}
|
|
} else if (converted) {
|
|
/* copy directly to output if it is large enough or there is not any
|
|
data in the output FIFO */
|
|
av_dlog(avr, "[copy] %s to output\n", converted->name);
|
|
output->nb_samples = 0;
|
|
ret = ff_audio_data_copy(output, converted,
|
|
avr->remap_point == REMAP_OUT_COPY ?
|
|
&avr->ch_map_info : NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
av_dlog(avr, "[end conversion]\n");
|
|
return output->nb_samples;
|
|
}
|
|
av_dlog(avr, "[end conversion]\n");
|
|
return 0;
|
|
}
|
|
|
|
int attribute_align_arg avresample_convert(AVAudioResampleContext *avr,
|
|
uint8_t **output, int out_plane_size,
|
|
int out_samples, uint8_t **input,
|
|
int in_plane_size, int in_samples)
|
|
{
|
|
AudioData input_buffer;
|
|
AudioData output_buffer;
|
|
AudioData *current_buffer;
|
|
int ret, direct_output;
|
|
|
|
/* reset internal buffers */
|
|
if (avr->in_buffer) {
|
|
avr->in_buffer->nb_samples = 0;
|
|
ff_audio_data_set_channels(avr->in_buffer,
|
|
avr->in_buffer->allocated_channels);
|
|
}
|
|
if (avr->resample_out_buffer) {
|
|
avr->resample_out_buffer->nb_samples = 0;
|
|
ff_audio_data_set_channels(avr->resample_out_buffer,
|
|
avr->resample_out_buffer->allocated_channels);
|
|
}
|
|
if (avr->out_buffer) {
|
|
avr->out_buffer->nb_samples = 0;
|
|
ff_audio_data_set_channels(avr->out_buffer,
|
|
avr->out_buffer->allocated_channels);
|
|
}
|
|
|
|
av_dlog(avr, "[start conversion]\n");
|
|
|
|
/* initialize output_buffer with output data */
|
|
direct_output = output && av_audio_fifo_size(avr->out_fifo) == 0;
|
|
if (output) {
|
|
ret = ff_audio_data_init(&output_buffer, output, out_plane_size,
|
|
avr->out_channels, out_samples,
|
|
avr->out_sample_fmt, 0, "output");
|
|
if (ret < 0)
|
|
return ret;
|
|
output_buffer.nb_samples = 0;
|
|
}
|
|
|
|
if (input) {
|
|
/* initialize input_buffer with input data */
|
|
ret = ff_audio_data_init(&input_buffer, input, in_plane_size,
|
|
avr->in_channels, in_samples,
|
|
avr->in_sample_fmt, 1, "input");
|
|
if (ret < 0)
|
|
return ret;
|
|
current_buffer = &input_buffer;
|
|
|
|
if (avr->upmix_needed && !avr->in_convert_needed && !avr->resample_needed &&
|
|
!avr->out_convert_needed && direct_output && out_samples >= in_samples) {
|
|
/* in some rare cases we can copy input to output and upmix
|
|
directly in the output buffer */
|
|
av_dlog(avr, "[copy] %s to output\n", current_buffer->name);
|
|
ret = ff_audio_data_copy(&output_buffer, current_buffer,
|
|
avr->remap_point == REMAP_OUT_COPY ?
|
|
&avr->ch_map_info : NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
current_buffer = &output_buffer;
|
|
} else if (avr->remap_point == REMAP_OUT_COPY &&
|
|
(!direct_output || out_samples < in_samples)) {
|
|
/* if remapping channels during output copy, we may need to
|
|
* use an intermediate buffer in order to remap before adding
|
|
* samples to the output fifo */
|
|
av_dlog(avr, "[copy] %s to out_buffer\n", current_buffer->name);
|
|
ret = ff_audio_data_copy(avr->out_buffer, current_buffer,
|
|
&avr->ch_map_info);
|
|
if (ret < 0)
|
|
return ret;
|
|
current_buffer = avr->out_buffer;
|
|
} else if (avr->in_copy_needed || avr->in_convert_needed) {
|
|
/* if needed, copy or convert input to in_buffer, and downmix if
|
|
applicable */
|
|
if (avr->in_convert_needed) {
|
|
ret = ff_audio_data_realloc(avr->in_buffer,
|
|
current_buffer->nb_samples);
|
|
if (ret < 0)
|
|
return ret;
|
|
av_dlog(avr, "[convert] %s to in_buffer\n", current_buffer->name);
|
|
ret = ff_audio_convert(avr->ac_in, avr->in_buffer,
|
|
current_buffer);
|
|
if (ret < 0)
|
|
return ret;
|
|
} else {
|
|
av_dlog(avr, "[copy] %s to in_buffer\n", current_buffer->name);
|
|
ret = ff_audio_data_copy(avr->in_buffer, current_buffer,
|
|
avr->remap_point == REMAP_IN_COPY ?
|
|
&avr->ch_map_info : NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
ff_audio_data_set_channels(avr->in_buffer, avr->in_channels);
|
|
if (avr->downmix_needed) {
|
|
av_dlog(avr, "[downmix] in_buffer\n");
|
|
ret = ff_audio_mix(avr->am, avr->in_buffer);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
current_buffer = avr->in_buffer;
|
|
}
|
|
} else {
|
|
/* flush resampling buffer and/or output FIFO if input is NULL */
|
|
if (!avr->resample_needed)
|
|
return handle_buffered_output(avr, output ? &output_buffer : NULL,
|
|
NULL);
|
|
current_buffer = NULL;
|
|
}
|
|
|
|
if (avr->resample_needed) {
|
|
AudioData *resample_out;
|
|
|
|
if (!avr->out_convert_needed && direct_output && out_samples > 0)
|
|
resample_out = &output_buffer;
|
|
else
|
|
resample_out = avr->resample_out_buffer;
|
|
av_dlog(avr, "[resample] %s to %s\n",
|
|
current_buffer ? current_buffer->name : "null",
|
|
resample_out->name);
|
|
ret = ff_audio_resample(avr->resample, resample_out,
|
|
current_buffer);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* if resampling did not produce any samples, just return 0 */
|
|
if (resample_out->nb_samples == 0) {
|
|
av_dlog(avr, "[end conversion]\n");
|
|
return 0;
|
|
}
|
|
|
|
current_buffer = resample_out;
|
|
}
|
|
|
|
if (avr->upmix_needed) {
|
|
av_dlog(avr, "[upmix] %s\n", current_buffer->name);
|
|
ret = ff_audio_mix(avr->am, current_buffer);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
/* if we resampled or upmixed directly to output, return here */
|
|
if (current_buffer == &output_buffer) {
|
|
av_dlog(avr, "[end conversion]\n");
|
|
return current_buffer->nb_samples;
|
|
}
|
|
|
|
if (avr->out_convert_needed) {
|
|
if (direct_output && out_samples >= current_buffer->nb_samples) {
|
|
/* convert directly to output */
|
|
av_dlog(avr, "[convert] %s to output\n", current_buffer->name);
|
|
ret = ff_audio_convert(avr->ac_out, &output_buffer, current_buffer);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
av_dlog(avr, "[end conversion]\n");
|
|
return output_buffer.nb_samples;
|
|
} else {
|
|
ret = ff_audio_data_realloc(avr->out_buffer,
|
|
current_buffer->nb_samples);
|
|
if (ret < 0)
|
|
return ret;
|
|
av_dlog(avr, "[convert] %s to out_buffer\n", current_buffer->name);
|
|
ret = ff_audio_convert(avr->ac_out, avr->out_buffer,
|
|
current_buffer);
|
|
if (ret < 0)
|
|
return ret;
|
|
current_buffer = avr->out_buffer;
|
|
}
|
|
}
|
|
|
|
return handle_buffered_output(avr, output ? &output_buffer : NULL,
|
|
current_buffer);
|
|
}
|
|
|
|
int avresample_get_matrix(AVAudioResampleContext *avr, double *matrix,
|
|
int stride)
|
|
{
|
|
int in_channels, out_channels, i, o;
|
|
|
|
if (avr->am)
|
|
return ff_audio_mix_get_matrix(avr->am, matrix, stride);
|
|
|
|
in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout);
|
|
out_channels = av_get_channel_layout_nb_channels(avr->out_channel_layout);
|
|
|
|
if ( in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS ||
|
|
out_channels <= 0 || out_channels > AVRESAMPLE_MAX_CHANNELS) {
|
|
av_log(avr, AV_LOG_ERROR, "Invalid channel layouts\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (!avr->mix_matrix) {
|
|
av_log(avr, AV_LOG_ERROR, "matrix is not set\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
for (o = 0; o < out_channels; o++)
|
|
for (i = 0; i < in_channels; i++)
|
|
matrix[o * stride + i] = avr->mix_matrix[o * in_channels + i];
|
|
|
|
return 0;
|
|
}
|
|
|
|
int avresample_set_matrix(AVAudioResampleContext *avr, const double *matrix,
|
|
int stride)
|
|
{
|
|
int in_channels, out_channels, i, o;
|
|
|
|
if (avr->am)
|
|
return ff_audio_mix_set_matrix(avr->am, matrix, stride);
|
|
|
|
in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout);
|
|
out_channels = av_get_channel_layout_nb_channels(avr->out_channel_layout);
|
|
|
|
if ( in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS ||
|
|
out_channels <= 0 || out_channels > AVRESAMPLE_MAX_CHANNELS) {
|
|
av_log(avr, AV_LOG_ERROR, "Invalid channel layouts\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (avr->mix_matrix)
|
|
av_freep(&avr->mix_matrix);
|
|
avr->mix_matrix = av_malloc(in_channels * out_channels *
|
|
sizeof(*avr->mix_matrix));
|
|
if (!avr->mix_matrix)
|
|
return AVERROR(ENOMEM);
|
|
|
|
for (o = 0; o < out_channels; o++)
|
|
for (i = 0; i < in_channels; i++)
|
|
avr->mix_matrix[o * in_channels + i] = matrix[o * stride + i];
|
|
|
|
return 0;
|
|
}
|
|
|
|
int avresample_set_channel_mapping(AVAudioResampleContext *avr,
|
|
const int *channel_map)
|
|
{
|
|
ChannelMapInfo *info = &avr->ch_map_info;
|
|
int in_channels, ch, i;
|
|
|
|
in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout);
|
|
if (in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS) {
|
|
av_log(avr, AV_LOG_ERROR, "Invalid input channel layout\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
memset(info, 0, sizeof(*info));
|
|
memset(info->input_map, -1, sizeof(info->input_map));
|
|
|
|
for (ch = 0; ch < in_channels; ch++) {
|
|
if (channel_map[ch] >= in_channels) {
|
|
av_log(avr, AV_LOG_ERROR, "Invalid channel map\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
if (channel_map[ch] < 0) {
|
|
info->channel_zero[ch] = 1;
|
|
info->channel_map[ch] = -1;
|
|
info->do_zero = 1;
|
|
} else if (info->input_map[channel_map[ch]] >= 0) {
|
|
info->channel_copy[ch] = info->input_map[channel_map[ch]];
|
|
info->channel_map[ch] = -1;
|
|
info->do_copy = 1;
|
|
} else {
|
|
info->channel_map[ch] = channel_map[ch];
|
|
info->input_map[channel_map[ch]] = ch;
|
|
info->do_remap = 1;
|
|
}
|
|
}
|
|
/* Fill-in unmapped input channels with unmapped output channels.
|
|
This is used when remapping during conversion from interleaved to
|
|
planar format. */
|
|
for (ch = 0, i = 0; ch < in_channels && i < in_channels; ch++, i++) {
|
|
while (ch < in_channels && info->input_map[ch] >= 0)
|
|
ch++;
|
|
while (i < in_channels && info->channel_map[i] >= 0)
|
|
i++;
|
|
if (ch >= in_channels || i >= in_channels)
|
|
break;
|
|
info->input_map[ch] = i;
|
|
}
|
|
|
|
avr->use_channel_map = 1;
|
|
return 0;
|
|
}
|
|
|
|
int avresample_available(AVAudioResampleContext *avr)
|
|
{
|
|
return av_audio_fifo_size(avr->out_fifo);
|
|
}
|
|
|
|
int avresample_read(AVAudioResampleContext *avr, uint8_t **output, int nb_samples)
|
|
{
|
|
if (!output)
|
|
return av_audio_fifo_drain(avr->out_fifo, nb_samples);
|
|
return av_audio_fifo_read(avr->out_fifo, (void**)output, nb_samples);
|
|
}
|
|
|
|
unsigned avresample_version(void)
|
|
{
|
|
return LIBAVRESAMPLE_VERSION_INT;
|
|
}
|
|
|
|
const char *avresample_license(void)
|
|
{
|
|
#define LICENSE_PREFIX "libavresample license: "
|
|
return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
|
|
}
|
|
|
|
const char *avresample_configuration(void)
|
|
{
|
|
return LIBAV_CONFIGURATION;
|
|
}
|