/*

  * Copyright (c) Stefano Sabatini | stefasab at gmail.com
  * Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #include "libavutil/avassert.h"

 #include "libavutil/channel_layout.h"

 #include "libavutil/common.h"

 
 #include "audio.h"
 #include "avfilter.h"
 #include "internal.h"
 

 int avfilter_ref_get_channels(AVFilterBufferRef *ref)
 {
     return ref->audio ? ref->audio->channels : 0;
 }
 

 AVFilterBufferRef *ff_null_get_audio_buffer(AVFilterLink *link, int perms,
                                             int nb_samples)
 {
     return ff_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
 }
 
 AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
                                                int nb_samples)
 {
     AVFilterBufferRef *samplesref = NULL;
     uint8_t **data;
     int planar      = av_sample_fmt_is_planar(link->format);

     int nb_channels = link->channels;

     int planes      = planar ? nb_channels : 1;
     int linesize;

     int full_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE |
                      AV_PERM_REUSE | AV_PERM_REUSE2 | AV_PERM_ALIGN;
 
     av_assert1(!(perms & ~(full_perms | AV_PERM_NEG_LINESIZES)));

 
     if (!(data = av_mallocz(sizeof(*data) * planes)))
         goto fail;
 
     if (av_samples_alloc(data, &linesize, nb_channels, nb_samples, link->format, 0) < 0)
         goto fail;
 

     samplesref = avfilter_get_audio_buffer_ref_from_arrays_channels(
         data, linesize, full_perms, nb_samples, link->format,
         link->channels, link->channel_layout);

     if (!samplesref)
         goto fail;
 

     samplesref->audio->sample_rate = link->sample_rate;
 

     av_freep(&data);
 
 fail:
     if (data)
         av_freep(&data[0]);
     av_freep(&data);
     return samplesref;
 }
 
 AVFilterBufferRef *ff_get_audio_buffer(AVFilterLink *link, int perms,
                                        int nb_samples)
 {
     AVFilterBufferRef *ret = NULL;
 
     if (link->dstpad->get_audio_buffer)
         ret = link->dstpad->get_audio_buffer(link, perms, nb_samples);
 
     if (!ret)
         ret = ff_default_get_audio_buffer(link, perms, nb_samples);
 
     if (ret)
         ret->type = AVMEDIA_TYPE_AUDIO;
 
     return ret;
 }
 

 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays_channels(uint8_t **data,
                                                                       int linesize,
                                                                       int perms,
                                                                       int nb_samples,
                                                                       enum AVSampleFormat sample_fmt,
                                                                       int channels,
                                                                       uint64_t channel_layout)

 {
     int planes;
     AVFilterBuffer    *samples    = av_mallocz(sizeof(*samples));
     AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
 
     if (!samples || !samplesref)
         goto fail;
 

     av_assert0(channels);
     av_assert0(channel_layout == 0 ||
                channels == av_get_channel_layout_nb_channels(channel_layout));
 

     samplesref->buf         = samples;
     samplesref->buf->free   = ff_avfilter_default_free_buffer;
     if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
         goto fail;
 
     samplesref->audio->nb_samples     = nb_samples;
     samplesref->audio->channel_layout = channel_layout;

     samplesref->audio->channels       = channels;

     planes = av_sample_fmt_is_planar(sample_fmt) ? channels : 1;

 
     /* make sure the buffer gets read permission or it's useless for output */
     samplesref->perms = perms | AV_PERM_READ;
 
     samples->refcount  = 1;
     samplesref->type   = AVMEDIA_TYPE_AUDIO;
     samplesref->format = sample_fmt;
 
     memcpy(samples->data, data,
            FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
     memcpy(samplesref->data, samples->data, sizeof(samples->data));
 
     samples->linesize[0] = samplesref->linesize[0] = linesize;
 
     if (planes > FF_ARRAY_ELEMS(samples->data)) {
         samples->   extended_data = av_mallocz(sizeof(*samples->extended_data) *
                                                planes);
         samplesref->extended_data = av_mallocz(sizeof(*samplesref->extended_data) *
                                                planes);
 
         if (!samples->extended_data || !samplesref->extended_data)
             goto fail;
 
         memcpy(samples->   extended_data, data, sizeof(*data)*planes);
         memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
     } else {
         samples->extended_data    = samples->data;
         samplesref->extended_data = samplesref->data;
     }
 

     samplesref->pts = AV_NOPTS_VALUE;
 

     return samplesref;
 
 fail:
     if (samples && samples->extended_data != samples->data)
         av_freep(&samples->extended_data);
     if (samplesref) {
         av_freep(&samplesref->audio);
         if (samplesref->extended_data != samplesref->data)
             av_freep(&samplesref->extended_data);
     }
     av_freep(&samplesref);
     av_freep(&samples);
     return NULL;
 }
 

 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
                                                              int linesize,int perms,
                                                              int nb_samples,
                                                              enum AVSampleFormat sample_fmt,
                                                              uint64_t channel_layout)
 {
     int channels = av_get_channel_layout_nb_channels(channel_layout);
     return avfilter_get_audio_buffer_ref_from_arrays_channels(data, linesize, perms,
                                                               nb_samples, sample_fmt,
                                                               channels, channel_layout);
 }