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  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(sizeof(*samples->extended_data) *
  128.                                                planes);
  129.         samplesref->extended_data = av_mallocz(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
  171.