/*

  * 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/audioconvert.h"
 
 #include "audio.h"
 #include "avfilter.h"
 #include "internal.h"
 
 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 = av_get_channel_layout_nb_channels(link->channel_layout);
     int planes      = planar ? nb_channels : 1;
     int linesize;
 
     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(data, linesize, perms,

                                                            nb_samples, link->format,
                                                            link->channel_layout);
     if (!samplesref)
         goto fail;
 
     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(uint8_t **data,

                                                              int linesize,int perms,
                                                              int nb_samples,
                                                              enum AVSampleFormat sample_fmt,
                                                              uint64_t channel_layout)
 {
     int planes;
     AVFilterBuffer    *samples    = av_mallocz(sizeof(*samples));
     AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
 
     if (!samples || !samplesref)
         goto fail;
 
     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;
 

     planes = av_sample_fmt_is_planar(sample_fmt) ?
         av_get_channel_layout_nb_channels(channel_layout) : 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;
 }
 
 void ff_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
 {
     ff_filter_samples(link->dst->outputs[0], samplesref);
 }
 
 /* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
 void ff_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
 {
     AVFilterLink *outlink = NULL;
 
     if (inlink->dst->output_count)
         outlink = inlink->dst->outputs[0];
 
     if (outlink) {
         outlink->out_buf = ff_default_get_audio_buffer(inlink, AV_PERM_WRITE,
                                                        samplesref->audio->nb_samples);
         outlink->out_buf->pts                = samplesref->pts;
         outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
         ff_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
         avfilter_unref_buffer(outlink->out_buf);
         outlink->out_buf = NULL;
     }
     avfilter_unref_buffer(samplesref);
     inlink->cur_buf = NULL;
 }
 
 void ff_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
 {
     void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
     AVFilterPad *dst = link->dstpad;

     int64_t pts;

 
     FF_DPRINTF_START(NULL, filter_samples); ff_dlog_link(NULL, link, 1);
 
     if (!(filter_samples = dst->filter_samples))
         filter_samples = ff_default_filter_samples;
 
     /* prepare to copy the samples if the buffer has insufficient permissions */
     if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
         dst->rej_perms & samplesref->perms) {
         int  i, planar = av_sample_fmt_is_planar(samplesref->format);
         int planes = !planar ? 1:
                      av_get_channel_layout_nb_channels(samplesref->audio->channel_layout);
 
         av_log(link->dst, AV_LOG_DEBUG,
                "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
                samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
 
         link->cur_buf = ff_default_get_audio_buffer(link, dst->min_perms,
                                                     samplesref->audio->nb_samples);
         link->cur_buf->pts                = samplesref->pts;
         link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
 
         /* Copy actual data into new samples buffer */

         for (i = 0; samplesref->data[i] && i < 8; i++)
             memcpy(link->cur_buf->data[i], samplesref->data[i], samplesref->linesize[0]);

         for (i = 0; i < planes; i++)
             memcpy(link->cur_buf->extended_data[i], samplesref->extended_data[i], samplesref->linesize[0]);
 
         avfilter_unref_buffer(samplesref);
     } else
         link->cur_buf = samplesref;
 

     pts = link->cur_buf->pts;

     filter_samples(link, link->cur_buf);

     ff_update_link_current_pts(link, pts);

 }