git.sesse.net Git - ffmpeg/blob - libavfilter/audio.c

   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 #if FF_API_AVFILTERBUFFER
  32 FF_DISABLE_DEPRECATION_WARNINGS
  33 int avfilter_ref_get_channels(AVFilterBufferRef *ref)
  34 {
  35     return ref->audio ? ref->audio->channels : 0;
  36 }
  37 FF_ENABLE_DEPRECATION_WARNINGS
  38 #endif
  39
  40 AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
  41 {
  42     return ff_get_audio_buffer(link->dst->outputs[0], nb_samples);
  43 }
  44
  45 AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples)
  46 {
  47     AVFrame *frame = av_frame_alloc();
  48     int channels = link->channels;
  49     int ret;
  50
  51     av_assert0(channels == av_get_channel_layout_nb_channels(link->channel_layout) || !av_get_channel_layout_nb_channels(link->channel_layout));
  52
  53     if (!frame)
  54         return NULL;
  55
  56     frame->nb_samples     = nb_samples;
  57     frame->format         = link->format;
  58     av_frame_set_channels(frame, link->channels);
  59     frame->channel_layout = link->channel_layout;
  60     frame->sample_rate    = link->sample_rate;
  61     ret = av_frame_get_buffer(frame, 0);
  62     if (ret < 0) {
  63         av_frame_free(&frame);
  64         return NULL;
  65     }
  66
  67     av_samples_set_silence(frame->extended_data, 0, nb_samples, channels,
  68                            link->format);
  69
  70
  71     return frame;
  72 }
  73
  74 AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
  75 {
  76     AVFrame *ret = NULL;
  77
  78     if (link->dstpad->get_audio_buffer)
  79         ret = link->dstpad->get_audio_buffer(link, nb_samples);
  80
  81     if (!ret)
  82         ret = ff_default_get_audio_buffer(link, nb_samples);
  83
  84     return ret;
  85 }
  86
  87 #if FF_API_AVFILTERBUFFER
  88 FF_DISABLE_DEPRECATION_WARNINGS
  89 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays_channels(uint8_t **data,
  90                                                                       int linesize,int perms,
  91                                                                       int nb_samples,
  92                                                                       enum AVSampleFormat sample_fmt,
  93                                                                       int channels,
  94                                                                       uint64_t channel_layout)
  95 {
  96     int planes;
  97     AVFilterBuffer    *samples    = av_mallocz(sizeof(*samples));
  98     AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
  99
 100     if (!samples || !samplesref)
 101         goto fail;
 102
 103     av_assert0(channels);
 104     av_assert0(channel_layout == 0 ||
 105                channels == av_get_channel_layout_nb_channels(channel_layout));
 106
 107     samplesref->buf         = samples;
 108     samplesref->buf->free   = ff_avfilter_default_free_buffer;
 109     if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
 110         goto fail;
 111
 112     samplesref->audio->nb_samples     = nb_samples;
 113     samplesref->audio->channel_layout = channel_layout;
 114     samplesref->audio->channels       = channels;
 115
 116     planes = av_sample_fmt_is_planar(sample_fmt) ? channels : 1;
 117
 118     /* make sure the buffer gets read permission or it's useless for output */
 119     samplesref->perms = perms | AV_PERM_READ;
 120
 121     samples->refcount  = 1;
 122     samplesref->type   = AVMEDIA_TYPE_AUDIO;
 123     samplesref->format = sample_fmt;
 124
 125     memcpy(samples->data, data,
 126            FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
 127     memcpy(samplesref->data, samples->data, sizeof(samples->data));
 128
 129     samples->linesize[0] = samplesref->linesize[0] = linesize;
 130
 131     if (planes > FF_ARRAY_ELEMS(samples->data)) {
 132         samples->   extended_data = av_mallocz_array(sizeof(*samples->extended_data),
 133                                                planes);
 134         samplesref->extended_data = av_mallocz_array(sizeof(*samplesref->extended_data),
 135                                                planes);
 136
 137         if (!samples->extended_data || !samplesref->extended_data)
 138             goto fail;
 139
 140         memcpy(samples->   extended_data, data, sizeof(*data)*planes);
 141         memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
 142     } else {
 143         samples->extended_data    = samples->data;
 144         samplesref->extended_data = samplesref->data;
 145     }
 146
 147     samplesref->pts = AV_NOPTS_VALUE;
 148
 149     return samplesref;
 150
 151 fail:
 152     if (samples && samples->extended_data != samples->data)
 153         av_freep(&samples->extended_data);
 154     if (samplesref) {
 155         av_freep(&samplesref->audio);
 156         if (samplesref->extended_data != samplesref->data)
 157             av_freep(&samplesref->extended_data);
 158     }
 159     av_freep(&samplesref);
 160     av_freep(&samples);
 161     return NULL;
 162 }
 163
 164 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
 165                                                              int linesize,int perms,
 166                                                              int nb_samples,
 167                                                              enum AVSampleFormat sample_fmt,
 168                                                              uint64_t channel_layout)
 169 {
 170     int channels = av_get_channel_layout_nb_channels(channel_layout);
 171     return avfilter_get_audio_buffer_ref_from_arrays_channels(data, linesize, perms,
 172                                                               nb_samples, sample_fmt,
 173                                                               channels, channel_layout);
 174 }
 175 FF_ENABLE_DEPRECATION_WARNINGS
 176 #endif