|
- /*
- * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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.
- *
- * FFmpeg 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 FFmpeg; 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/frame.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));
- }
-
- /* 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 &&
- !ff_sample_fmt_is_planar(avr->out_sample_fmt, avr->out_channels)) {
- 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 &&
- !ff_sample_fmt_is_planar(avr->out_sample_fmt, avr->out_channels);
-
- 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_log(avr, AV_LOG_TRACE, "remap channels during in_copy\n");
- } else if (avr->in_convert_needed) {
- avr->remap_point = REMAP_IN_CONVERT;
- av_log(avr, AV_LOG_TRACE, "remap channels during in_convert\n");
- } else if (avr->out_convert_needed) {
- avr->remap_point = REMAP_OUT_CONVERT;
- av_log(avr, AV_LOG_TRACE, "remap channels during out_convert\n");
- } else {
- avr->remap_point = REMAP_OUT_COPY;
- av_log(avr, AV_LOG_TRACE, "remap channels during out_copy\n");
- }
-
- #ifdef DEBUG
- {
- int ch;
- av_log(avr, AV_LOG_TRACE, "output map: ");
- if (avr->ch_map_info.do_remap)
- for (ch = 0; ch < avr->in_channels; ch++)
- av_log(avr, AV_LOG_TRACE, " % 2d", avr->ch_map_info.channel_map[ch]);
- else
- av_log(avr, AV_LOG_TRACE, "n/a");
- av_log(avr, AV_LOG_TRACE, "\n");
- av_log(avr, AV_LOG_TRACE, "copy map: ");
- if (avr->ch_map_info.do_copy)
- for (ch = 0; ch < avr->in_channels; ch++)
- av_log(avr, AV_LOG_TRACE, " % 2d", avr->ch_map_info.channel_copy[ch]);
- else
- av_log(avr, AV_LOG_TRACE, "n/a");
- av_log(avr, AV_LOG_TRACE, "\n");
- av_log(avr, AV_LOG_TRACE, "zero map: ");
- if (avr->ch_map_info.do_zero)
- for (ch = 0; ch < avr->in_channels; ch++)
- av_log(avr, AV_LOG_TRACE, " % 2d", avr->ch_map_info.channel_zero[ch]);
- else
- av_log(avr, AV_LOG_TRACE, "n/a");
- av_log(avr, AV_LOG_TRACE, "\n");
- av_log(avr, AV_LOG_TRACE, "input map: ");
- for (ch = 0; ch < avr->in_channels; ch++)
- av_log(avr, AV_LOG_TRACE, " % 2d", avr->ch_map_info.input_map[ch]);
- av_log(avr, AV_LOG_TRACE, "\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,
- 1024, 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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[FIFO] read from out_fifo to output\n");
- av_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[end conversion]\n");
- return output->nb_samples;
- }
- av_log(avr, AV_LOG_TRACE, "[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 * const *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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[end conversion]\n");
- return 0;
- }
-
- current_buffer = resample_out;
- }
-
- if (avr->upmix_needed) {
- av_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_log(avr, AV_LOG_TRACE, "[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_config(AVAudioResampleContext *avr, AVFrame *out, AVFrame *in)
- {
- if (avresample_is_open(avr)) {
- avresample_close(avr);
- }
-
- if (in) {
- avr->in_channel_layout = in->channel_layout;
- avr->in_sample_rate = in->sample_rate;
- avr->in_sample_fmt = in->format;
- }
-
- if (out) {
- avr->out_channel_layout = out->channel_layout;
- avr->out_sample_rate = out->sample_rate;
- avr->out_sample_fmt = out->format;
- }
-
- return 0;
- }
-
- static int config_changed(AVAudioResampleContext *avr,
- AVFrame *out, AVFrame *in)
- {
- int ret = 0;
-
- if (in) {
- if (avr->in_channel_layout != in->channel_layout ||
- avr->in_sample_rate != in->sample_rate ||
- avr->in_sample_fmt != in->format) {
- ret |= AVERROR_INPUT_CHANGED;
- }
- }
-
- if (out) {
- if (avr->out_channel_layout != out->channel_layout ||
- avr->out_sample_rate != out->sample_rate ||
- avr->out_sample_fmt != out->format) {
- ret |= AVERROR_OUTPUT_CHANGED;
- }
- }
-
- return ret;
- }
-
- static inline int convert_frame(AVAudioResampleContext *avr,
- AVFrame *out, AVFrame *in)
- {
- int ret;
- uint8_t **out_data = NULL, **in_data = NULL;
- int out_linesize = 0, in_linesize = 0;
- int out_nb_samples = 0, in_nb_samples = 0;
-
- if (out) {
- out_data = out->extended_data;
- out_linesize = out->linesize[0];
- out_nb_samples = out->nb_samples;
- }
-
- if (in) {
- in_data = in->extended_data;
- in_linesize = in->linesize[0];
- in_nb_samples = in->nb_samples;
- }
-
- ret = avresample_convert(avr, out_data, out_linesize,
- out_nb_samples,
- in_data, in_linesize,
- in_nb_samples);
-
- if (ret < 0) {
- if (out)
- out->nb_samples = 0;
- return ret;
- }
-
- if (out)
- out->nb_samples = ret;
-
- return 0;
- }
-
- static inline int available_samples(AVFrame *out)
- {
- int samples;
- int bytes_per_sample = av_get_bytes_per_sample(out->format);
- if (!bytes_per_sample)
- return AVERROR(EINVAL);
-
- samples = out->linesize[0] / bytes_per_sample;
- if (av_sample_fmt_is_planar(out->format)) {
- return samples;
- } else {
- int channels = av_get_channel_layout_nb_channels(out->channel_layout);
- return samples / channels;
- }
- }
-
- int avresample_convert_frame(AVAudioResampleContext *avr,
- AVFrame *out, AVFrame *in)
- {
- int ret, setup = 0;
-
- if (!avresample_is_open(avr)) {
- if ((ret = avresample_config(avr, out, in)) < 0)
- return ret;
- if ((ret = avresample_open(avr)) < 0)
- return ret;
- setup = 1;
- } else {
- // return as is or reconfigure for input changes?
- if ((ret = config_changed(avr, out, in)))
- return ret;
- }
-
- if (out) {
- if (!out->linesize[0]) {
- out->nb_samples = avresample_get_out_samples(avr, in->nb_samples);
- if ((ret = av_frame_get_buffer(out, 0)) < 0) {
- if (setup)
- avresample_close(avr);
- return ret;
- }
- } else {
- if (!out->nb_samples)
- out->nb_samples = available_samples(out);
- }
- }
-
- return convert_frame(avr, out, in);
- }
-
- 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_get_out_samples(AVAudioResampleContext *avr, int in_nb_samples)
- {
- int64_t samples = avresample_get_delay(avr) + (int64_t)in_nb_samples;
-
- if (avr->resample_needed) {
- samples = av_rescale_rnd(samples,
- avr->out_sample_rate,
- avr->in_sample_rate,
- AV_ROUND_UP);
- }
-
- samples += avresample_available(avr);
-
- if (samples > INT_MAX)
- return AVERROR(EINVAL);
-
- return samples;
- }
-
- 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 FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
- }
-
- const char *avresample_configuration(void)
- {
- return FFMPEG_CONFIGURATION;
- }
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