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