/*
  * AIFF/AIFF-C muxer
  * Copyright (c) 2006  Patrick Guimond
  *
  * 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 <stdint.h>
 

 #include "libavutil/intfloat.h"

 #include "libavutil/opt.h"

 #include "avformat.h"

 #include "internal.h"

 #include "aiff.h"

 #include "avio_internal.h"

 #include "isom.h"

 #include "id3v2.h"

 
 typedef struct {

     const AVClass *class;

     int64_t form;
     int64_t frames;
     int64_t ssnd;

     int audio_stream_idx;
     AVPacketList *pict_list;
     int write_id3v2;
     int id3v2_version;

 } AIFFOutputContext;
 

 static int put_id3v2_tags(AVFormatContext *s, AIFFOutputContext *aiff)
 {
     int ret;
     uint64_t pos, end, size;
     ID3v2EncContext id3v2 = { 0 };
     AVIOContext *pb = s->pb;
     AVPacketList *pict_list = aiff->pict_list;
 
     if (!pb->seekable)
         return 0;
 
     if (!s->metadata && !aiff->pict_list)
         return 0;
 
     avio_wl32(pb, MKTAG('I', 'D', '3', ' '));
     avio_wb32(pb, 0);
     pos = avio_tell(pb);
 
     ff_id3v2_start(&id3v2, pb, aiff->id3v2_version, ID3v2_DEFAULT_MAGIC);
     ff_id3v2_write_metadata(s, &id3v2);
     while (pict_list) {
         if ((ret = ff_id3v2_write_apic(s, &id3v2, &pict_list->pkt)) < 0)
             return ret;
         pict_list = pict_list->next;
     }

     ff_id3v2_finish(&id3v2, pb, s->metadata_header_padding);

 
     end = avio_tell(pb);
     size = end - pos;
 
     /* Update chunk size */
     avio_seek(pb, pos - 4, SEEK_SET);
     avio_wb32(pb, size);
     avio_seek(pb, end, SEEK_SET);
 
     if (size & 1)
         avio_w8(pb, 0);
 
     return 0;
 }
 

 static void put_meta(AVFormatContext *s, const char *key, uint32_t id)
 {
     AVDictionaryEntry *tag;
     AVIOContext *pb = s->pb;
 
     if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
         int size = strlen(tag->value);
 
         avio_wl32(pb, id);
         avio_wb32(pb, FFALIGN(size, 2));
         avio_write(pb, tag->value, size);
         if (size & 1)
             avio_w8(pb, 0);
     }
 }
 

 static int aiff_write_header(AVFormatContext *s)
 {
     AIFFOutputContext *aiff = s->priv_data;

     AVIOContext *pb = s->pb;

     AVCodecContext *enc;

     uint64_t sample_rate;

     int i, aifc = 0;
 
     aiff->audio_stream_idx = -1;
     for (i = 0; i < s->nb_streams; i++) {
         AVStream *st = s->streams[i];
         if (aiff->audio_stream_idx < 0 && st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
             aiff->audio_stream_idx = i;
         } else if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO) {
             av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in AIFF.\n");
             return AVERROR(EINVAL);
         }
     }
     if (aiff->audio_stream_idx < 0) {
         av_log(s, AV_LOG_ERROR, "No audio stream present.\n");
         return AVERROR(EINVAL);
     }
 
     enc = s->streams[aiff->audio_stream_idx]->codec;

 
     /* First verify if format is ok */
     if (!enc->codec_tag)
         return -1;
     if (enc->codec_tag != MKTAG('N','O','N','E'))
         aifc = 1;
 
     /* FORM AIFF header */

     ffio_wfourcc(pb, "FORM");

     aiff->form = avio_tell(pb);

     avio_wb32(pb, 0);                    /* file length */

     ffio_wfourcc(pb, aifc ? "AIFC" : "AIFF");

 
     if (aifc) { // compressed audio
         if (!enc->block_align) {
             av_log(s, AV_LOG_ERROR, "block align not set\n");
             return -1;
         }
         /* Version chunk */

         ffio_wfourcc(pb, "FVER");

         avio_wb32(pb, 4);
         avio_wb32(pb, 0xA2805140);

     }
 

     if (enc->channels > 2 && enc->channel_layout) {
         ffio_wfourcc(pb, "CHAN");
         avio_wb32(pb, 12);
         ff_mov_write_chan(pb, enc->channel_layout);
     }
 

     put_meta(s, "title",     MKTAG('N', 'A', 'M', 'E'));
     put_meta(s, "author",    MKTAG('A', 'U', 'T', 'H'));
     put_meta(s, "copyright", MKTAG('(', 'c', ')', ' '));
     put_meta(s, "comment",   MKTAG('A', 'N', 'N', 'O'));
 

     /* Common chunk */

     ffio_wfourcc(pb, "COMM");

     avio_wb32(pb, aifc ? 24 : 18); /* size */
     avio_wb16(pb, enc->channels);  /* Number of channels */

     aiff->frames = avio_tell(pb);

     avio_wb32(pb, 0);              /* Number of frames */

 
     if (!enc->bits_per_coded_sample)
         enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);
     if (!enc->bits_per_coded_sample) {
         av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
         return -1;
     }
     if (!enc->block_align)
         enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
 

     avio_wb16(pb, enc->bits_per_coded_sample); /* Sample size */

     sample_rate = av_double2int(enc->sample_rate);
     avio_wb16(pb, (sample_rate >> 52) + (16383 - 1023));
     avio_wb64(pb, UINT64_C(1) << 63 | sample_rate << 11);

 
     if (aifc) {

         avio_wl32(pb, enc->codec_tag);
         avio_wb16(pb, 0);

     }
 

     if (enc->codec_tag == MKTAG('Q','D','M','2') && enc->extradata_size) {
         ffio_wfourcc(pb, "wave");
         avio_wb32(pb, enc->extradata_size);
         avio_write(pb, enc->extradata, enc->extradata_size);
     }
 

     /* Sound data chunk */

     ffio_wfourcc(pb, "SSND");

     aiff->ssnd = avio_tell(pb);         /* Sound chunk size */

     avio_wb32(pb, 0);                    /* Sound samples data size */
     avio_wb32(pb, 0);                    /* Data offset */
     avio_wb32(pb, 0);                    /* Block-size (block align) */

     avpriv_set_pts_info(s->streams[aiff->audio_stream_idx], 64, 1,
                         s->streams[aiff->audio_stream_idx]->codec->sample_rate);

 
     /* Data is starting here */

     avio_flush(pb);

 
     return 0;
 }
 

 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     AIFFOutputContext *aiff = s->priv_data;
     AVIOContext *pb = s->pb;
     if (pkt->stream_index == aiff->audio_stream_idx)
         avio_write(pb, pkt->data, pkt->size);
     else {
         int ret;
         AVPacketList *pict_list, *last;
 
         if (s->streams[pkt->stream_index]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
             return 0;
 
         /* warn only once for each stream */
         if (s->streams[pkt->stream_index]->nb_frames == 1) {
             av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d,"
                    " ignoring.\n", pkt->stream_index);
         }
         if (s->streams[pkt->stream_index]->nb_frames >= 1)
             return 0;
 
         pict_list = av_mallocz(sizeof(AVPacketList));
         if (!pict_list)
             return AVERROR(ENOMEM);
 
         if ((ret = av_copy_packet(&pict_list->pkt, pkt)) < 0) {
             av_freep(&pict_list);
             return ret;
         }
 
         if (!aiff->pict_list)
             aiff->pict_list = pict_list;
         else {
             last = aiff->pict_list;
             while (last->next)
                 last = last->next;
             last->next = pict_list;
         }
     }
 
     return 0;
 }
 

 static int aiff_write_trailer(AVFormatContext *s)
 {

     int ret;

     AVIOContext *pb = s->pb;

     AIFFOutputContext *aiff = s->priv_data;

     AVPacketList *pict_list = aiff->pict_list;
     AVCodecContext *enc = s->streams[aiff->audio_stream_idx]->codec;

 
     /* Chunks sizes must be even */
     int64_t file_size, end_size;

     end_size = file_size = avio_tell(pb);

     if (file_size & 1) {

         avio_w8(pb, 0);

         end_size++;
     }
 

     if (s->pb->seekable) {

         /* Number of sample frames */

         avio_seek(pb, aiff->frames, SEEK_SET);

         avio_wb32(pb, (file_size-aiff->ssnd-12)/enc->block_align);

 
         /* Sound Data chunk size */

         avio_seek(pb, aiff->ssnd, SEEK_SET);

         avio_wb32(pb, file_size - aiff->ssnd - 4);

 
         /* return to the end */

         avio_seek(pb, end_size, SEEK_SET);

         /* Write ID3 tags */
         if (aiff->write_id3v2)
             if ((ret = put_id3v2_tags(s, aiff)) < 0)
                 return ret;
 
         /* File length */
         file_size = avio_tell(pb);
         avio_seek(pb, aiff->form, SEEK_SET);
         avio_wb32(pb, file_size - aiff->form - 4);
 

         avio_flush(pb);

     }
 

     while (pict_list) {
         AVPacketList *next = pict_list->next;
         av_free_packet(&pict_list->pkt);
         av_freep(&pict_list);
         pict_list = next;
     }
 

     return 0;
 }
 

 #define OFFSET(x) offsetof(AIFFOutputContext, x)
 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {
     { "write_id3v2", "Enable ID3 tags writing.",
       OFFSET(write_id3v2), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC },
     { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
       OFFSET(id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 3, 4, ENC },
     { NULL },
 };
 
 static const AVClass aiff_muxer_class = {
     .class_name     = "AIFF muxer",
     .item_name      = av_default_item_name,
     .option         = options,
     .version        = LIBAVUTIL_VERSION_INT,
 };
 

 AVOutputFormat ff_aiff_muxer = {

     .name              = "aiff",
     .long_name         = NULL_IF_CONFIG_SMALL("Audio IFF"),
     .mime_type         = "audio/aiff",
     .extensions        = "aif,aiff,afc,aifc",
     .priv_data_size    = sizeof(AIFFOutputContext),

     .audio_codec       = AV_CODEC_ID_PCM_S16BE,

     .video_codec       = AV_CODEC_ID_PNG,

     .write_header      = aiff_write_header,

     .write_packet      = aiff_write_packet,

     .write_trailer     = aiff_write_trailer,

     .codec_tag         = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },

     .priv_class        = &aiff_muxer_class,

 };