libavfilter/audio.c

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include "libavutil/channel_layout.h"
  20 #include "libavutil/common.h"
  21
  22 #include "audio.h"
  23 #include "avfilter.h"
  24 #include "internal.h"
  25
  26 AVFilterBufferRef *ff_null_get_audio_buffer(AVFilterLink *link, int perms,
  27                                             int nb_samples)
  28 {
  29     return ff_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
  30 }
  31
  32 AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
  33                                                int nb_samples)
  34 {
  35     AVFilterBufferRef *samplesref = NULL;
  36     uint8_t **data;
  37     int planar      = av_sample_fmt_is_planar(link->format);
  38     int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
  39     int planes      = planar ? nb_channels : 1;
  40     int linesize;
  41
  42     if (!(data = av_mallocz(sizeof(*data) * planes)))
  43         goto fail;
  44
  45     if (av_samples_alloc(data, &linesize, nb_channels, nb_samples, link->format, 0) < 0)
  46         goto fail;
  47
  48     samplesref = avfilter_get_audio_buffer_ref_from_arrays(data, linesize, perms,
  49                                                            nb_samples, link->format,
  50                                                            link->channel_layout);
  51     if (!samplesref)
  52         goto fail;
  53
  54     av_freep(&data);
  55
  56 fail:
  57     if (data)
  58         av_freep(&data[0]);
  59     av_freep(&data);
  60     return samplesref;
  61 }
  62
  63 AVFilterBufferRef *ff_get_audio_buffer(AVFilterLink *link, int perms,
  64                                        int nb_samples)
  65 {
  66     AVFilterBufferRef *ret = NULL;
  67
  68     if (link->dstpad->get_audio_buffer)
  69         ret = link->dstpad->get_audio_buffer(link, perms, nb_samples);
  70
  71     if (!ret)
  72         ret = ff_default_get_audio_buffer(link, perms, nb_samples);
  73
  74     if (ret)
  75         ret->type = AVMEDIA_TYPE_AUDIO;
  76
  77     return ret;
  78 }
  79
  80 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
  81                                                              int linesize,int perms,
  82                                                              int nb_samples,
  83                                                              enum AVSampleFormat sample_fmt,
  84                                                              uint64_t channel_layout)
  85 {
  86     int planes;
  87     AVFilterBuffer    *samples    = av_mallocz(sizeof(*samples));
  88     AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
  89
  90     if (!samples || !samplesref)
  91         goto fail;
  92
  93     samplesref->buf         = samples;
  94     samplesref->buf->free   = ff_avfilter_default_free_buffer;
  95     if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
  96         goto fail;
  97
  98     samplesref->audio->nb_samples     = nb_samples;
  99     samplesref->audio->channel_layout = channel_layout;
 100     samplesref->audio->planar         = av_sample_fmt_is_planar(sample_fmt);
 101
 102     planes = samplesref->audio->planar ? av_get_channel_layout_nb_channels(channel_layout) : 1;
 103
 104     /* make sure the buffer gets read permission or it's useless for output */
 105     samplesref->perms = perms | AV_PERM_READ;
 106
 107     samples->refcount  = 1;
 108     samplesref->type   = AVMEDIA_TYPE_AUDIO;
 109     samplesref->format = sample_fmt;
 110
 111     memcpy(samples->data, data,
 112            FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
 113     memcpy(samplesref->data, samples->data, sizeof(samples->data));
 114
 115     samples->linesize[0] = samplesref->linesize[0] = linesize;
 116
 117     if (planes > FF_ARRAY_ELEMS(samples->data)) {
 118         samples->   extended_data = av_mallocz(sizeof(*samples->extended_data) *
 119                                                planes);
 120         samplesref->extended_data = av_mallocz(sizeof(*samplesref->extended_data) *
 121                                                planes);
 122
 123         if (!samples->extended_data || !samplesref->extended_data)
 124             goto fail;
 125
 126         memcpy(samples->   extended_data, data, sizeof(*data)*planes);
 127         memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
 128     } else {
 129         samples->extended_data    = samples->data;
 130         samplesref->extended_data = samplesref->data;
 131     }
 132
 133     samplesref->pts = AV_NOPTS_VALUE;
 134
 135     return samplesref;
 136
 137 fail:
 138     if (samples && samples->extended_data != samples->data)
 139         av_freep(&samples->extended_data);
 140     if (samplesref) {
 141         av_freep(&samplesref->audio);
 142         if (samplesref->extended_data != samplesref->data)
 143             av_freep(&samplesref->extended_data);
 144     }
 145     av_freep(&samplesref);
 146     av_freep(&samples);
 147     return NULL;
 148 }