| 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 | #include "libavcodec/avcodec.h" |
| 26 | |
| 27 | #include "audio.h" |
| 28 | #include "avfilter.h" |
| 29 | #include "internal.h" |
| 30 | |
| 31 | int avfilter_ref_get_channels(AVFilterBufferRef *ref) |
| 32 | { |
| 33 | return ref->audio ? ref->audio->channels : 0; |
| 34 | } |
| 35 | |
| 36 | AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples) |
| 37 | { |
| 38 | return ff_get_audio_buffer(link->dst->outputs[0], nb_samples); |
| 39 | } |
| 40 | |
| 41 | AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples) |
| 42 | { |
| 43 | AVFrame *frame = av_frame_alloc(); |
| 44 | int channels = link->channels; |
| 45 | int ret; |
| 46 | |
| 47 | av_assert0(channels == av_get_channel_layout_nb_channels(link->channel_layout) || !av_get_channel_layout_nb_channels(link->channel_layout)); |
| 48 | |
| 49 | if (!frame) |
| 50 | return NULL; |
| 51 | |
| 52 | frame->nb_samples = nb_samples; |
| 53 | frame->format = link->format; |
| 54 | av_frame_set_channels(frame, link->channels); |
| 55 | frame->channel_layout = link->channel_layout; |
| 56 | frame->sample_rate = link->sample_rate; |
| 57 | ret = av_frame_get_buffer(frame, 0); |
| 58 | if (ret < 0) { |
| 59 | av_frame_free(&frame); |
| 60 | return NULL; |
| 61 | } |
| 62 | |
| 63 | av_samples_set_silence(frame->extended_data, 0, nb_samples, channels, |
| 64 | link->format); |
| 65 | |
| 66 | |
| 67 | return frame; |
| 68 | } |
| 69 | |
| 70 | AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples) |
| 71 | { |
| 72 | AVFrame *ret = NULL; |
| 73 | |
| 74 | if (link->dstpad->get_audio_buffer) |
| 75 | ret = link->dstpad->get_audio_buffer(link, nb_samples); |
| 76 | |
| 77 | if (!ret) |
| 78 | ret = ff_default_get_audio_buffer(link, nb_samples); |
| 79 | |
| 80 | return ret; |
| 81 | } |
| 82 | |
| 83 | #if FF_API_AVFILTERBUFFER |
| 84 | AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays_channels(uint8_t **data, |
| 85 | int linesize,int perms, |
| 86 | int nb_samples, |
| 87 | enum AVSampleFormat sample_fmt, |
| 88 | int channels, |
| 89 | uint64_t channel_layout) |
| 90 | { |
| 91 | int planes; |
| 92 | AVFilterBuffer *samples = av_mallocz(sizeof(*samples)); |
| 93 | AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref)); |
| 94 | |
| 95 | if (!samples || !samplesref) |
| 96 | goto fail; |
| 97 | |
| 98 | av_assert0(channels); |
| 99 | av_assert0(channel_layout == 0 || |
| 100 | channels == av_get_channel_layout_nb_channels(channel_layout)); |
| 101 | |
| 102 | samplesref->buf = samples; |
| 103 | samplesref->buf->free = ff_avfilter_default_free_buffer; |
| 104 | if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio)))) |
| 105 | goto fail; |
| 106 | |
| 107 | samplesref->audio->nb_samples = nb_samples; |
| 108 | samplesref->audio->channel_layout = channel_layout; |
| 109 | samplesref->audio->channels = channels; |
| 110 | |
| 111 | planes = av_sample_fmt_is_planar(sample_fmt) ? channels : 1; |
| 112 | |
| 113 | /* make sure the buffer gets read permission or it's useless for output */ |
| 114 | samplesref->perms = perms | AV_PERM_READ; |
| 115 | |
| 116 | samples->refcount = 1; |
| 117 | samplesref->type = AVMEDIA_TYPE_AUDIO; |
| 118 | samplesref->format = sample_fmt; |
| 119 | |
| 120 | memcpy(samples->data, data, |
| 121 | FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0])); |
| 122 | memcpy(samplesref->data, samples->data, sizeof(samples->data)); |
| 123 | |
| 124 | samples->linesize[0] = samplesref->linesize[0] = linesize; |
| 125 | |
| 126 | if (planes > FF_ARRAY_ELEMS(samples->data)) { |
| 127 | samples-> extended_data = av_mallocz_array(sizeof(*samples->extended_data), |
| 128 | planes); |
| 129 | samplesref->extended_data = av_mallocz_array(sizeof(*samplesref->extended_data), |
| 130 | planes); |
| 131 | |
| 132 | if (!samples->extended_data || !samplesref->extended_data) |
| 133 | goto fail; |
| 134 | |
| 135 | memcpy(samples-> extended_data, data, sizeof(*data)*planes); |
| 136 | memcpy(samplesref->extended_data, data, sizeof(*data)*planes); |
| 137 | } else { |
| 138 | samples->extended_data = samples->data; |
| 139 | samplesref->extended_data = samplesref->data; |
| 140 | } |
| 141 | |
| 142 | samplesref->pts = AV_NOPTS_VALUE; |
| 143 | |
| 144 | return samplesref; |
| 145 | |
| 146 | fail: |
| 147 | if (samples && samples->extended_data != samples->data) |
| 148 | av_freep(&samples->extended_data); |
| 149 | if (samplesref) { |
| 150 | av_freep(&samplesref->audio); |
| 151 | if (samplesref->extended_data != samplesref->data) |
| 152 | av_freep(&samplesref->extended_data); |
| 153 | } |
| 154 | av_freep(&samplesref); |
| 155 | av_freep(&samples); |
| 156 | return NULL; |
| 157 | } |
| 158 | |
| 159 | AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data, |
| 160 | int linesize,int perms, |
| 161 | int nb_samples, |
| 162 | enum AVSampleFormat sample_fmt, |
| 163 | uint64_t channel_layout) |
| 164 | { |
| 165 | int channels = av_get_channel_layout_nb_channels(channel_layout); |
| 166 | return avfilter_get_audio_buffer_ref_from_arrays_channels(data, linesize, perms, |
| 167 | nb_samples, sample_fmt, |
| 168 | channels, channel_layout); |
| 169 | } |
| 170 | #endif |