/*
  * Copyright (c) 2011 Stefano Sabatini
  *
  * 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
  */
 
 /**
  * @file

  * filter for showing textual audio frame information

  */
 

 #include <inttypes.h>
 #include <stddef.h>
 

 #include "libavutil/adler32.h"

 #include "libavutil/channel_layout.h"

 #include "libavutil/common.h"
 #include "libavutil/mem.h"

 #include "libavutil/timestamp.h"

 #include "libavutil/samplefmt.h"
 

 #include "audio.h"

 #include "avfilter.h"

 #include "internal.h"

 typedef struct AShowInfoContext {
     /**
      * Scratch space for individual plane checksums for planar audio
      */
     uint32_t *plane_checksums;
 
     /**
      * Frame counter
      */
     uint64_t frame;
 } AShowInfoContext;

 static void uninit(AVFilterContext *ctx)
 {
     AShowInfoContext *s = ctx->priv;
     av_freep(&s->plane_checksums);
 }
 

 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)

 {
     AVFilterContext *ctx = inlink->dst;

     AShowInfoContext *s  = ctx->priv;

     char chlayout_str[128];

     uint32_t checksum = 0;
     int channels    = av_get_channel_layout_nb_channels(buf->audio->channel_layout);
     int planar      = av_sample_fmt_is_planar(buf->format);
     int block_align = av_get_bytes_per_sample(buf->format) * (planar ? 1 : channels);
     int data_size   = buf->audio->nb_samples * block_align;
     int planes      = planar ? channels : 1;
     int i;

     void *tmp_ptr = av_realloc(s->plane_checksums, channels * sizeof(*s->plane_checksums));
 
     if (!tmp_ptr)
         return AVERROR(ENOMEM);
     s->plane_checksums = tmp_ptr;

 
     for (i = 0; i < planes; i++) {
         uint8_t *data = buf->extended_data[i];
 
         s->plane_checksums[i] = av_adler32_update(0, data, data_size);
         checksum = i ? av_adler32_update(checksum, data, data_size) :
                        s->plane_checksums[0];

     }
 
     av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), -1,

                                  buf->audio->channel_layout);

 
     av_log(ctx, AV_LOG_INFO,

            "n:%"PRIu64" pts:%s pts_time:%s pos:%"PRId64" "

            "fmt:%s channels:%d chlayout:%s rate:%d nb_samples:%d "

            "checksum:%08X ",

            s->frame,
            av_ts2str(buf->pts), av_ts2timestr(buf->pts, &inlink->time_base),
            buf->pos,

            av_get_sample_fmt_name(buf->format), buf->audio->channels, chlayout_str,

            buf->audio->sample_rate, buf->audio->nb_samples,
            checksum);
 
     av_log(ctx, AV_LOG_INFO, "plane_checksums: [ ");
     for (i = 0; i < planes; i++)
         av_log(ctx, AV_LOG_INFO, "%08X ", s->plane_checksums[i]);

     av_log(ctx, AV_LOG_INFO, "]\n");

     s->frame++;

     return ff_filter_frame(inlink->dst->outputs[0], buf);

 }
 

 static const AVFilterPad inputs[] = {
     {
         .name       = "default",
         .type             = AVMEDIA_TYPE_AUDIO,
         .get_audio_buffer = ff_null_get_audio_buffer,

         .filter_frame     = filter_frame,

         .min_perms        = AV_PERM_READ,
     },
     { NULL },
 };
 
 static const AVFilterPad outputs[] = {
     {
         .name = "default",
         .type = AVMEDIA_TYPE_AUDIO,
     },
     { NULL },
 };
 

 AVFilter avfilter_af_ashowinfo = {
     .name        = "ashowinfo",
     .description = NULL_IF_CONFIG_SMALL("Show textual information for each audio frame."),

     .priv_size   = sizeof(AShowInfoContext),
     .uninit      = uninit,
     .inputs      = inputs,
     .outputs     = outputs,

 };