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/*
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 * WAV muxer and demuxer
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 * Copyright (c) 2001, 2002 Fabrice Bellard
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 *
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 * Sony Wave64 demuxer
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 * RF64 demuxer
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 * Copyright (c) 2009 Daniel Verkamp
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avformat.h"
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#include "avio_internal.h"
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#include "pcm.h"
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#include "riff.h"
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typedef struct {
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    int64_t data;
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    int64_t data_end;
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    int64_t minpts;
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    int64_t maxpts;
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    int last_duration;
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    int w64;
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} WAVContext;
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#if CONFIG_WAV_MUXER
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static int wav_write_header(AVFormatContext *s)
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{
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    WAVContext *wav = s->priv_data;
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    AVIOContext *pb = s->pb;
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    int64_t fmt, fact;
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    ffio_wfourcc(pb, "RIFF");
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    avio_wl32(pb, 0); /* file length */
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    ffio_wfourcc(pb, "WAVE");
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    /* format header */
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    fmt = ff_start_tag(pb, "fmt ");
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    if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
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        av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
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               s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
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        av_free(wav);
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        return -1;
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    }
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    ff_end_tag(pb, fmt);
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    if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
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        && !url_is_streamed(s->pb)) {
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        fact = ff_start_tag(pb, "fact");
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        avio_wl32(pb, 0);
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        ff_end_tag(pb, fact);
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    }
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    av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
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    wav->maxpts = wav->last_duration = 0;
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    wav->minpts = INT64_MAX;
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    /* data header */
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    wav->data = ff_start_tag(pb, "data");
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    put_flush_packet(pb);
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    return 0;
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}
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static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    AVIOContext *pb  = s->pb;
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    WAVContext    *wav = s->priv_data;
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    avio_write(pb, pkt->data, pkt->size);
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    if(pkt->pts != AV_NOPTS_VALUE) {
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        wav->minpts        = FFMIN(wav->minpts, pkt->pts);
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        wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);
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        wav->last_duration = pkt->duration;
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    } else
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        av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
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    return 0;
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}
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static int wav_write_trailer(AVFormatContext *s)
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{
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    AVIOContext *pb  = s->pb;
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    WAVContext    *wav = s->priv_data;
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    int64_t file_size;
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    put_flush_packet(pb);
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    if (!url_is_streamed(s->pb)) {
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        ff_end_tag(pb, wav->data);
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        /* update file size */
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        file_size = url_ftell(pb);
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        url_fseek(pb, 4, SEEK_SET);
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        avio_wl32(pb, (uint32_t)(file_size - 8));
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        url_fseek(pb, file_size, SEEK_SET);
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        put_flush_packet(pb);
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        if(s->streams[0]->codec->codec_tag != 0x01) {
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            /* Update num_samps in fact chunk */
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            int number_of_samples;
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            number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
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                                           s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
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                                           s->streams[0]->time_base.den);
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            url_fseek(pb, wav->data-12, SEEK_SET);
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            avio_wl32(pb, number_of_samples);
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            url_fseek(pb, file_size, SEEK_SET);
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            put_flush_packet(pb);
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        }
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    }
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    return 0;
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}
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AVOutputFormat ff_wav_muxer = {
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    "wav",
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    NULL_IF_CONFIG_SMALL("WAV format"),
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    "audio/x-wav",
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    "wav",
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    sizeof(WAVContext),
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    CODEC_ID_PCM_S16LE,
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    CODEC_ID_NONE,
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    wav_write_header,
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    wav_write_packet,
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    wav_write_trailer,
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    .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
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};
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#endif /* CONFIG_WAV_MUXER */
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#if CONFIG_WAV_DEMUXER
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static int64_t next_tag(AVIOContext *pb, unsigned int *tag)
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{
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    *tag = avio_rl32(pb);
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    return avio_rl32(pb);
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}
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/* return the size of the found tag */
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static int64_t find_tag(AVIOContext *pb, uint32_t tag1)
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{
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    unsigned int tag;
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    int64_t size;
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    for (;;) {
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        if (url_feof(pb))
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            return -1;
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        size = next_tag(pb, &tag);
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        if (tag == tag1)
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            break;
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        url_fseek(pb, size, SEEK_CUR);
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    }
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    return size;
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}
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static int wav_probe(AVProbeData *p)
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{
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    /* check file header */
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    if (p->buf_size <= 32)
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        return 0;
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    if (!memcmp(p->buf + 8, "WAVE", 4)) {
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        if (!memcmp(p->buf, "RIFF", 4))
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            /*
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              Since ACT demuxer has standard WAV header at top of it's own,
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              returning score is decreased to avoid probe conflict
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              between ACT and WAV.
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            */
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            return AVPROBE_SCORE_MAX - 1;
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        else if (!memcmp(p->buf,      "RF64", 4) &&
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                 !memcmp(p->buf + 12, "ds64", 4))
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            return AVPROBE_SCORE_MAX;
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    }
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    return 0;
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}
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/* wav input */
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static int wav_read_header(AVFormatContext *s,
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                           AVFormatParameters *ap)
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{
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    int64_t size, av_uninit(data_size);
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    int64_t sample_count=0;
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    int rf64;
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    unsigned int tag;
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    AVIOContext *pb = s->pb;
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    AVStream *st;
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    WAVContext *wav = s->priv_data;
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    /* check RIFF header */
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    tag = avio_rl32(pb);
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    rf64 = tag == MKTAG('R', 'F', '6', '4');
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    if (!rf64 && tag != MKTAG('R', 'I', 'F', 'F'))
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        return -1;
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    avio_rl32(pb); /* file size */
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    tag = avio_rl32(pb);
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    if (tag != MKTAG('W', 'A', 'V', 'E'))
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        return -1;
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    if (rf64) {
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        if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
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            return -1;
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        size = avio_rl32(pb);
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        if (size < 16)
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            return -1;
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        avio_rl64(pb); /* RIFF size */
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        data_size = avio_rl64(pb);
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        sample_count = avio_rl64(pb);
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        url_fskip(pb, size - 16); /* skip rest of ds64 chunk */
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    }
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    /* parse fmt header */
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    size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
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    if (size < 0)
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        return -1;
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    st = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    ff_get_wav_header(pb, st->codec, size);
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    st->need_parsing = AVSTREAM_PARSE_FULL;
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    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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    for (;;) {
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        if (url_feof(pb))
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            return -1;
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        size = next_tag(pb, &tag);
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        if (tag == MKTAG('d', 'a', 't', 'a')){
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            break;
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        }else if (tag == MKTAG('f','a','c','t') && !sample_count){
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            sample_count = avio_rl32(pb);
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            size -= 4;
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        }
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        url_fseek(pb, size, SEEK_CUR);
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    }
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    if (rf64)
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        size = data_size;
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    if (size < 0)
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        return -1;
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    if (!size) {
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        wav->data_end = INT64_MAX;
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    } else
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        wav->data_end= url_ftell(pb) + size;
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    if (!sample_count && st->codec->channels && av_get_bits_per_sample(st->codec->codec_id))
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        sample_count = (size<<3) / (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));
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    if (sample_count)
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        st->duration = sample_count;
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    return 0;
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}
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/** Find chunk with w64 GUID by skipping over other chunks
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 * @return the size of the found chunk
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 */
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static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
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{
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    uint8_t guid[16];
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    int64_t size;
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272
    while (!url_feof(pb)) {
273
        avio_read(pb, guid, 16);
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        size = avio_rl64(pb);
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        if (size <= 24)
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            return -1;
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        if (!memcmp(guid, guid1, 16))
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            return size;
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        url_fskip(pb, FFALIGN(size, INT64_C(8)) - 24);
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    }
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    return -1;
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}
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static const uint8_t guid_data[16] = { 'd', 'a', 't', 'a',
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    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
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#define MAX_SIZE 4096
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static int wav_read_packet(AVFormatContext *s,
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                           AVPacket *pkt)
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{
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    int ret, size;
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    int64_t left;
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    AVStream *st;
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    WAVContext *wav = s->priv_data;
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    st = s->streams[0];
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    left = wav->data_end - url_ftell(s->pb);
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    if (left <= 0){
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        if (CONFIG_W64_DEMUXER && wav->w64)
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            left = find_guid(s->pb, guid_data) - 24;
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        else
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            left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
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        if (left < 0)
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            return AVERROR_EOF;
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        wav->data_end= url_ftell(s->pb) + left;
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    }
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    size = MAX_SIZE;
311
    if (st->codec->block_align > 1) {
312
        if (size < st->codec->block_align)
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            size = st->codec->block_align;
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        size = (size / st->codec->block_align) * st->codec->block_align;
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    }
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    size = FFMIN(size, left);
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    ret  = av_get_packet(s->pb, pkt, size);
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    if (ret < 0)
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        return ret;
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    pkt->stream_index = 0;
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    return ret;
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}
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static int wav_read_seek(AVFormatContext *s,
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                         int stream_index, int64_t timestamp, int flags)
327
{
328
    AVStream *st;
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    st = s->streams[0];
331
    switch (st->codec->codec_id) {
332
    case CODEC_ID_MP2:
333
    case CODEC_ID_MP3:
334
    case CODEC_ID_AC3:
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    case CODEC_ID_DTS:
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        /* use generic seeking with dynamically generated indexes */
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        return -1;
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    default:
339
        break;
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    }
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    return pcm_read_seek(s, stream_index, timestamp, flags);
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}
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AVInputFormat ff_wav_demuxer = {
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    "wav",
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    NULL_IF_CONFIG_SMALL("WAV format"),
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    sizeof(WAVContext),
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    wav_probe,
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    wav_read_header,
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    wav_read_packet,
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    NULL,
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    wav_read_seek,
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    .flags= AVFMT_GENERIC_INDEX,
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    .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
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};
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#endif /* CONFIG_WAV_DEMUXER */
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#if CONFIG_W64_DEMUXER
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static const uint8_t guid_riff[16] = { 'r', 'i', 'f', 'f',
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    0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00 };
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static const uint8_t guid_wave[16] = { 'w', 'a', 'v', 'e',
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    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
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static const uint8_t guid_fmt [16] = { 'f', 'm', 't', ' ',
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    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
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369
static int w64_probe(AVProbeData *p)
370
{
371
    if (p->buf_size <= 40)
372
        return 0;
373
    if (!memcmp(p->buf,      guid_riff, 16) &&
374
        !memcmp(p->buf + 24, guid_wave, 16))
375
        return AVPROBE_SCORE_MAX;
376
    else
377
        return 0;
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}
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static int w64_read_header(AVFormatContext *s, AVFormatParameters *ap)
381
{
382
    int64_t size;
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    AVIOContext *pb  = s->pb;
384
    WAVContext    *wav = s->priv_data;
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    AVStream *st;
386
    uint8_t guid[16];
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    avio_read(pb, guid, 16);
389
    if (memcmp(guid, guid_riff, 16))
390
        return -1;
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392
    if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8) /* riff + wave + fmt + sizes */
393
        return -1;
394

    
395
    avio_read(pb, guid, 16);
396
    if (memcmp(guid, guid_wave, 16)) {
397
        av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
398
        return -1;
399
    }
400

    
401
    size = find_guid(pb, guid_fmt);
402
    if (size < 0) {
403
        av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
404
        return -1;
405
    }
406

    
407
    st = av_new_stream(s, 0);
408
    if (!st)
409
        return AVERROR(ENOMEM);
410

    
411
    /* subtract chunk header size - normal wav file doesn't count it */
412
    ff_get_wav_header(pb, st->codec, size - 24);
413
    url_fskip(pb, FFALIGN(size, INT64_C(8)) - size);
414

    
415
    st->need_parsing = AVSTREAM_PARSE_FULL;
416

    
417
    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
418

    
419
    size = find_guid(pb, guid_data);
420
    if (size < 0) {
421
        av_log(s, AV_LOG_ERROR, "could not find data guid\n");
422
        return -1;
423
    }
424
    wav->data_end = url_ftell(pb) + size - 24;
425
    wav->w64      = 1;
426

    
427
    return 0;
428
}
429

    
430
AVInputFormat ff_w64_demuxer = {
431
    "w64",
432
    NULL_IF_CONFIG_SMALL("Sony Wave64 format"),
433
    sizeof(WAVContext),
434
    w64_probe,
435
    w64_read_header,
436
    wav_read_packet,
437
    NULL,
438
    wav_read_seek,
439
    .flags = AVFMT_GENERIC_INDEX,
440
    .codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
441
};
442
#endif /* CONFIG_W64_DEMUXER */