/*
  * WavPack muxer

  * Copyright (c) 2013 Konstantin Shishkov <kostya.shishkov@gmail.com>

  * Copyright (c) 2012 Paul B Mahol
  *
  * 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/attributes.h"
 

 #include "apetag.h"

 #include "avformat.h"
 #include "wv.h"

 typedef struct WvMuxContext {

     int64_t samples;

 } WvMuxContext;

 static av_cold int wv_write_header(AVFormatContext *ctx)

 {

     if (ctx->nb_streams > 1 ||

         ctx->streams[0]->codecpar->codec_id != AV_CODEC_ID_WAVPACK) {

         av_log(ctx, AV_LOG_ERROR, "This muxer only supports a single WavPack stream.\n");

         return AVERROR(EINVAL);
     }

     return 0;
 }
 

 static int wv_write_packet(AVFormatContext *ctx, AVPacket *pkt)

 {

     WvMuxContext *s = ctx->priv_data;
     WvHeader header;
     int ret;
 
     if (pkt->size < WV_HEADER_SIZE ||
         (ret = ff_wv_parse_header(&header, pkt->data)) < 0) {
         av_log(ctx, AV_LOG_ERROR, "Invalid WavPack packet.\n");
         return AVERROR(EINVAL);
     }
     s->samples += header.samples;

     avio_write(ctx->pb, pkt->data, pkt->size);

 
     return 0;
 }
 

 static av_cold int wv_write_trailer(AVFormatContext *ctx)

 {

     WvMuxContext *s = ctx->priv_data;

     /* update total number of samples in the first block */

     if ((ctx->pb->seekable & AVIO_SEEKABLE_NORMAL) && s->samples &&

         s->samples < UINT32_MAX) {
         int64_t pos = avio_tell(ctx->pb);

         avio_seek(ctx->pb, 12, SEEK_SET);

         avio_wl32(ctx->pb, s->samples);
         avio_seek(ctx->pb, pos, SEEK_SET);

     }
 

     ff_ape_write_tag(ctx);

     return 0;
 }
 
 AVOutputFormat ff_wv_muxer = {
     .name              = "wv",

     .long_name         = NULL_IF_CONFIG_SMALL("raw WavPack"),
     .mime_type         = "audio/x-wavpack",

     .extensions        = "wv",

     .priv_data_size    = sizeof(WvMuxContext),

     .audio_codec       = AV_CODEC_ID_WAVPACK,
     .video_codec       = AV_CODEC_ID_NONE,

     .write_header      = wv_write_header,
     .write_packet      = wv_write_packet,
     .write_trailer     = wv_write_trailer,

     .flags             = AVFMT_NOTIMESTAMPS,

 };