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
  26 #include "audio.h"
  27 #include "avfilter.h"
  28 #include "internal.h"
  29
  30 int avfilter_ref_get_channels(AVFilterBufferRef *ref)
  31 {
  32     return ref->audio ? ref->audio->channels : 0;
  33 }
  34
  35 AVFilterBufferRef *ff_null_get_audio_buffer(AVFilterLink *link, int perms,
  36                                             int nb_samples)
  37 {
  38     return ff_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
  39 }
  40
  41 AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
  42                                                int nb_samples)
  43 {
  44     AVFilterBufferRef *samplesref = NULL;
  45     uint8_t **data;
  46     int planar      = av_sample_fmt_is_planar(link->format);
  47     int nb_channels = link->channels;
  48     int planes      = planar ? nb_channels : 1;
  49     int linesize;
  50     int full_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE |
  51                      AV_PERM_REUSE | AV_PERM_REUSE2 | AV_PERM_ALIGN;
  52
  53     av_assert1(!(perms & ~(full_perms | AV_PERM_NEG_LINESIZES)));
  54
  55     if (!(data = av_mallocz(sizeof(*data) * planes)))
  56         goto fail;
  57
  58     if (av_samples_alloc(data, &linesize, nb_channels, nb_samples, link->format, 0) < 0)
  59         goto fail;
  60
  61     samplesref = avfilter_get_audio_buffer_ref_from_arrays_channels(
  62         data, linesize, full_perms, nb_samples, link->format,
  63         link->channels, link->channel_layout);
  64     if (!samplesref)
  65         goto fail;
  66
  67     samplesref->audio->sample_rate = link->sample_rate;
  68
  69     av_freep(&data);
  70
  71 fail:
  72     if (data)
  73         av_freep(&data[0]);
  74     av_freep(&data);
  75     return samplesref;
  76 }
  77
  78 AVFilterBufferRef *ff_get_audio_buffer(AVFilterLink *link, int perms,
  79                                        int nb_samples)
  80 {
  81     AVFilterBufferRef *ret = NULL;
  82
  83     if (link->dstpad->get_audio_buffer)
  84         ret = link->dstpad->get_audio_buffer(link, perms, nb_samples);
  85
  86     if (!ret)
  87         ret = ff_default_get_audio_buffer(link, perms, nb_samples);
  88
  89     if (ret)
  90         ret->type = AVMEDIA_TYPE_AUDIO;
  91
  92     return ret;
  93 }
  94
  95 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays_channels(uint8_t **data,
  96                                                                       int linesize,
  97                                                                       int perms,
  98                                                                       int nb_samples,
  99                                                                       enum AVSampleFormat sample_fmt,
 100                                                                       int channels,
 101                                                                       uint64_t channel_layout)
 102 {
 103     int planes;
 104     AVFilterBuffer    *samples    = av_mallocz(sizeof(*samples));
 105     AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
 106
 107     if (!samples || !samplesref)
 108         goto fail;
 109
 110     av_assert0(channels);
 111     av_assert0(channel_layout == 0 ||
 112                channels == av_get_channel_layout_nb_channels(channel_layout));
 113
 114     samplesref->buf         = samples;
 115     samplesref->buf->free   = ff_avfilter_default_free_buffer;
 116     if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
 117         goto fail;
 118
 119     samplesref->audio->nb_samples     = nb_samples;
 120     samplesref->audio->channel_layout = channel_layout;
 121     samplesref->audio->channels       = channels;
 122
 123     planes = av_sample_fmt_is_planar(sample_fmt) ? channels : 1;
 124
 125     /* make sure the buffer gets read permission or it's useless for output */
 126     samplesref->perms = perms | AV_PERM_READ;
 127
 128     samples->refcount  = 1;
 129     samplesref->type   = AVMEDIA_TYPE_AUDIO;
 130     samplesref->format = sample_fmt;
 131
 132     memcpy(samples->data, data,
 133            FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
 134     memcpy(samplesref->data, samples->data, sizeof(samples->data));
 135
 136     samples->linesize[0] = samplesref->linesize[0] = linesize;
 137
 138     if (planes > FF_ARRAY_ELEMS(samples->data)) {
 139         samples->   extended_data = av_mallocz(sizeof(*samples->extended_data) *
 140                                                planes);
 141         samplesref->extended_data = av_mallocz(sizeof(*samplesref->extended_data) *
 142                                                planes);
 143
 144         if (!samples->extended_data || !samplesref->extended_data)
 145             goto fail;
 146
 147         memcpy(samples->   extended_data, data, sizeof(*data)*planes);
 148         memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
 149     } else {
 150         samples->extended_data    = samples->data;
 151         samplesref->extended_data = samplesref->data;
 152     }
 153
 154     samplesref->pts = AV_NOPTS_VALUE;
 155
 156     return samplesref;
 157
 158 fail:
 159     if (samples && samples->extended_data != samples->data)
 160         av_freep(&samples->extended_data);
 161     if (samplesref) {
 162         av_freep(&samplesref->audio);
 163         if (samplesref->extended_data != samplesref->data)
 164             av_freep(&samplesref->extended_data);
 165     }
 166     av_freep(&samplesref);
 167     av_freep(&samples);
 168     return NULL;
 169 }
 170
 171 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
 172                                                              int linesize,int perms,
 173                                                              int nb_samples,
 174                                                              enum AVSampleFormat sample_fmt,
 175                                                              uint64_t channel_layout)
 176 {
 177     int channels = av_get_channel_layout_nb_channels(channel_layout);
 178     return avfilter_get_audio_buffer_ref_from_arrays_channels(data, linesize, perms,
 179                                                               nb_samples, sample_fmt,
 180                                                               channels, channel_layout);
 181 }