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