blob: 5996f607b2434078286336591e70bd3342198d69
| 1 | /* |
| 2 | * Copyright (c) Stefano Sabatini | stefasab at gmail.com |
| 3 | * Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/avassert.h" |
| 23 | #include "libavutil/channel_layout.h" |
| 24 | #include "libavutil/common.h" |
| 25 | |
| 26 | #include "audio.h" |
| 27 | #include "avfilter.h" |
| 28 | #include "internal.h" |
| 29 | |
| 30 | #define BUFFER_ALIGN 0 |
| 31 | |
| 32 | |
| 33 | AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples) |
| 34 | { |
| 35 | return ff_get_audio_buffer(link->dst->outputs[0], nb_samples); |
| 36 | } |
| 37 | |
| 38 | AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples) |
| 39 | { |
| 40 | AVFrame *frame = NULL; |
| 41 | int channels = link->channels; |
| 42 | |
| 43 | av_assert0(channels == av_get_channel_layout_nb_channels(link->channel_layout) || !av_get_channel_layout_nb_channels(link->channel_layout)); |
| 44 | |
| 45 | if (!link->frame_pool) { |
| 46 | link->frame_pool = ff_frame_pool_audio_init(av_buffer_allocz, channels, |
| 47 | nb_samples, link->format, BUFFER_ALIGN); |
| 48 | if (!link->frame_pool) |
| 49 | return NULL; |
| 50 | } else { |
| 51 | int pool_channels = 0; |
| 52 | int pool_nb_samples = 0; |
| 53 | int pool_align = 0; |
| 54 | enum AVSampleFormat pool_format = AV_SAMPLE_FMT_NONE; |
| 55 | |
| 56 | if (ff_frame_pool_get_audio_config(link->frame_pool, |
| 57 | &pool_channels, &pool_nb_samples, |
| 58 | &pool_format, &pool_align) < 0) { |
| 59 | return NULL; |
| 60 | } |
| 61 | |
| 62 | if (pool_channels != channels || pool_nb_samples < nb_samples || |
| 63 | pool_format != link->format || pool_align != BUFFER_ALIGN) { |
| 64 | |
| 65 | ff_frame_pool_uninit((FFFramePool **)&link->frame_pool); |
| 66 | link->frame_pool = ff_frame_pool_audio_init(av_buffer_allocz, channels, |
| 67 | nb_samples, link->format, BUFFER_ALIGN); |
| 68 | if (!link->frame_pool) |
| 69 | return NULL; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | frame = ff_frame_pool_get(link->frame_pool); |
| 74 | if (!frame) |
| 75 | return NULL; |
| 76 | |
| 77 | frame->nb_samples = nb_samples; |
| 78 | frame->channel_layout = link->channel_layout; |
| 79 | frame->sample_rate = link->sample_rate; |
| 80 | |
| 81 | av_samples_set_silence(frame->extended_data, 0, nb_samples, channels, link->format); |
| 82 | |
| 83 | return frame; |
| 84 | } |
| 85 | |
| 86 | AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples) |
| 87 | { |
| 88 | AVFrame *ret = NULL; |
| 89 | |
| 90 | if (link->dstpad->get_audio_buffer) |
| 91 | ret = link->dstpad->get_audio_buffer(link, nb_samples); |
| 92 | |
| 93 | if (!ret) |
| 94 | ret = ff_default_get_audio_buffer(link, nb_samples); |
| 95 | |
| 96 | return ret; |
| 97 | } |
| 98 |