| /* |
| * Copyright (c) Stefano Sabatini | stefasab at gmail.com |
| * Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu |
| * |
| * 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/avassert.h" |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/common.h" |
| #include "libavutil/cpu.h" |
| |
| #include "audio.h" |
| #include "avfilter.h" |
| #include "avfilter_internal.h" |
| #include "framepool.h" |
| #include "internal.h" |
| |
| const AVFilterPad ff_audio_default_filterpad[1] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| } |
| }; |
| |
| AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples) |
| { |
| return ff_get_audio_buffer(link->dst->outputs[0], nb_samples); |
| } |
| |
| AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples) |
| { |
| AVFrame *frame = NULL; |
| FilterLinkInternal *const li = ff_link_internal(link); |
| int channels = link->ch_layout.nb_channels; |
| int align = av_cpu_max_align(); |
| |
| if (!li->frame_pool) { |
| li->frame_pool = ff_frame_pool_audio_init(av_buffer_allocz, channels, |
| nb_samples, link->format, align); |
| if (!li->frame_pool) |
| return NULL; |
| } else { |
| int pool_channels = 0; |
| int pool_nb_samples = 0; |
| int pool_align = 0; |
| enum AVSampleFormat pool_format = AV_SAMPLE_FMT_NONE; |
| |
| if (ff_frame_pool_get_audio_config(li->frame_pool, |
| &pool_channels, &pool_nb_samples, |
| &pool_format, &pool_align) < 0) { |
| return NULL; |
| } |
| |
| if (pool_channels != channels || pool_nb_samples < nb_samples || |
| pool_format != link->format || pool_align != align) { |
| |
| ff_frame_pool_uninit(&li->frame_pool); |
| li->frame_pool = ff_frame_pool_audio_init(av_buffer_allocz, channels, |
| nb_samples, link->format, align); |
| if (!li->frame_pool) |
| return NULL; |
| } |
| } |
| |
| frame = ff_frame_pool_get(li->frame_pool); |
| if (!frame) |
| return NULL; |
| |
| frame->nb_samples = nb_samples; |
| if (link->ch_layout.order != AV_CHANNEL_ORDER_UNSPEC && |
| av_channel_layout_copy(&frame->ch_layout, &link->ch_layout) < 0) { |
| av_frame_free(&frame); |
| return NULL; |
| } |
| frame->sample_rate = link->sample_rate; |
| |
| av_samples_set_silence(frame->extended_data, 0, nb_samples, channels, link->format); |
| |
| return frame; |
| } |
| |
| AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples) |
| { |
| AVFrame *ret = NULL; |
| |
| if (link->dstpad->get_buffer.audio) |
| ret = link->dstpad->get_buffer.audio(link, nb_samples); |
| |
| if (!ret) |
| ret = ff_default_get_audio_buffer(link, nb_samples); |
| |
| return ret; |
| } |