/*****************************************************************************
 * avcodec.c: video and audio decoder and encoder using libavcodec
 *****************************************************************************
 * Copyright (C) 1999-2008 VLC authors and VideoLAN
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *          Gildas Bazin <gbazin@videolan.org>
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_codec.h>
#include <vlc_demux.h>
#include <vlc_avcodec.h>
#include <vlc_cpu.h>

#include <libavcodec/avcodec.h>

#include "avcodec.h"
#include "chroma.h"
#include "avcommon.h"

/****************************************************************************
 * Local prototypes
 ****************************************************************************/
static const int  frame_skip_list[] = { -1, 0, 1, 2, 3, 4 };
static const char *const frame_skip_list_text[] =
  { N_("None"), N_("Default"), N_("Non-ref"), N_("Bidir"), N_("Non-key"), N_("All") };

static const int  idct_skip_list[] = { -1, 0, 1, 2, 3, 4 };
static const char *const idct_skip_list_text[] =
  { N_("None"), N_("Default"), N_("Non-ref"), N_("Bidir"), N_("Non-key"), N_("All") };

static const int  nloopf_list[] = { 0, 1, 2, 3, 4 };
static const char *const nloopf_list_text[] =
  { N_("None"), N_("Non-ref"), N_("Bidir"), N_("Non-key"), N_("All") };

#ifdef ENABLE_SOUT
static const char *const enc_hq_list[] = { "rd", "bits", "simple" };
static const char *const enc_hq_list_text[] = {
    N_("rd"), N_("bits"), N_("simple") };
#endif

#ifdef MERGE_FFMPEG
# ifdef HAVE_LIBAVFORMAT_AVFORMAT_H
#  include "../../demux/avformat/avformat.h"
# endif
# include "../../access/avio.h"
# include "../../packetizer/avparser.h"
#endif

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define MODULE_DESCRIPTION N_( "Various audio and video decoders/encoders " \
        "delivered by the FFmpeg library. This includes (MS)MPEG4, DivX, SV1,"\
        "H261, H263, H264, WMV, WMA, AAC, AMR, DV, MJPEG and other codecs")

vlc_module_begin ()
    set_shortname( "FFmpeg")
    set_subcategory( SUBCAT_INPUT_VCODEC )
    /* decoder main module */
    set_description( N_("FFmpeg audio/video decoder") )
    set_help( MODULE_DESCRIPTION )
    set_section( N_("Decoding") , NULL )

    add_shortcut("ffmpeg")
    set_capability("video decoder", 70)
    set_callbacks(InitVideoDec, EndVideoDec)

    add_submodule()
    add_shortcut("ffmpeghw")
    set_capability("video decoder", 10001)
    set_callbacks(InitVideoHwDec, EndVideoDec)

    add_submodule()
    add_shortcut("ffmpeg")
    set_capability("audio decoder", 70)
    set_callbacks(InitAudioDec, EndAudioDec)

    add_submodule()
    add_shortcut("ffmpeg")
    set_capability("spu decoder", 70)
    set_callbacks(InitSubtitleDec, EndSubtitleDec)

    add_bool( "avcodec-dr", true, DR_TEXT, NULL )
    add_bool( "avcodec-corrupted", true, CORRUPTED_TEXT, CORRUPTED_LONGTEXT )
    add_integer ( "avcodec-error-resilience", 1, ERROR_TEXT,
        ERROR_LONGTEXT )
    add_integer ( "avcodec-workaround-bugs", 1, BUGS_TEXT, BUGS_LONGTEXT )
    add_bool( "avcodec-hurry-up", true, HURRYUP_TEXT, HURRYUP_LONGTEXT )
    add_integer( "avcodec-skip-frame", 0, SKIP_FRAME_TEXT,
        SKIP_FRAME_LONGTEXT )
        change_integer_list( frame_skip_list, frame_skip_list_text )
    add_integer( "avcodec-skip-idct", 0, SKIP_IDCT_TEXT,
        SKIP_IDCT_LONGTEXT )
        change_integer_list( idct_skip_list, idct_skip_list_text )
    add_obsolete_integer( "avcodec-vismv" ) /* removed since 3.0.0 */
    add_obsolete_bool( "avcodec-fast" ) /* removed since 4.0.0 */
    add_integer ( "avcodec-skiploopfilter", 0, SKIPLOOPF_TEXT,
                  SKIPLOOPF_LONGTEXT)
        change_safe ()
        change_integer_list( nloopf_list, nloopf_list_text )

    add_integer( "avcodec-debug", 0, DEBUG_TEXT, DEBUG_LONGTEXT )
    add_string( "avcodec-codec", NULL, CODEC_TEXT, CODEC_LONGTEXT )
    add_obsolete_string( "avcodec-hw" ) /* removed since 4.0.0 */
    add_integer( "avcodec-threads", 0, THREADS_TEXT, THREADS_LONGTEXT )
    add_string( "avcodec-options", NULL, AV_OPTIONS_TEXT, AV_OPTIONS_LONGTEXT )


#ifdef ENABLE_SOUT
    /* encoder submodule */
    add_submodule ()
    add_shortcut( "ffmpeg" )
    set_section( N_("Encoding") , NULL )
    set_description( N_("FFmpeg video encoder") )
    set_capability( "video encoder", 100 )
    set_callback( InitVideoEnc )

    add_submodule()
    set_description( N_("FFmpeg video encoder") )
    set_capability( "image encoder", 100 )
    set_callback( InitVideoEnc )

    add_submodule()
    add_shortcut( "ffmpeg" )
    set_section( N_("Encoding") , NULL )
    set_description( N_("FFmpeg audio encoder") )
    set_capability( "audio encoder", 100 )
    set_callback( InitVideoEnc )

    add_string( ENC_CFG_PREFIX "codec", NULL, CODEC_TEXT, CODEC_LONGTEXT )
    add_string( ENC_CFG_PREFIX "hq", "rd", ENC_HQ_TEXT,
                ENC_HQ_LONGTEXT )
        change_string_list( enc_hq_list, enc_hq_list_text )
    add_integer( ENC_CFG_PREFIX "keyint", 0, ENC_KEYINT_TEXT,
                 ENC_KEYINT_LONGTEXT )
    add_integer( ENC_CFG_PREFIX "bframes", 0, ENC_BFRAMES_TEXT,
                 ENC_BFRAMES_LONGTEXT )
    add_bool( ENC_CFG_PREFIX "hurry-up", false, ENC_HURRYUP_TEXT,
              ENC_HURRYUP_LONGTEXT )
    add_bool( ENC_CFG_PREFIX "interlace", false, ENC_INTERLACE_TEXT,
              ENC_INTERLACE_LONGTEXT )
    add_bool( ENC_CFG_PREFIX "interlace-me", true, ENC_INTERLACE_ME_TEXT,
              ENC_INTERLACE_ME_LONGTEXT )
    add_integer( ENC_CFG_PREFIX "vt", 0, ENC_VT_TEXT,
                 ENC_VT_LONGTEXT )
    add_bool( ENC_CFG_PREFIX "pre-me", false, ENC_PRE_ME_TEXT,
              ENC_PRE_ME_LONGTEXT )
    add_integer( ENC_CFG_PREFIX "rc-buffer-size", 0,
                 ENC_RC_BUF_TEXT, ENC_RC_BUF_LONGTEXT )
    add_float( ENC_CFG_PREFIX "rc-buffer-aggressivity", 1.0,
               ENC_RC_BUF_AGGR_TEXT, NULL )
    add_float( ENC_CFG_PREFIX "i-quant-factor", 0,
               ENC_IQUANT_FACTOR_TEXT, ENC_IQUANT_FACTOR_LONGTEXT )
    add_integer( ENC_CFG_PREFIX "noise-reduction", 0,
                 ENC_NOISE_RED_TEXT, ENC_NOISE_RED_LONGTEXT )
    add_bool( ENC_CFG_PREFIX "mpeg4-matrix", false,
              ENC_MPEG4_MATRIX_TEXT, ENC_MPEG4_MATRIX_LONGTEXT )
    add_integer( ENC_CFG_PREFIX "qmin", 0,
                 ENC_QMIN_TEXT, NULL )
    add_integer( ENC_CFG_PREFIX "qmax", 0,
                 ENC_QMAX_TEXT, NULL )
    add_bool( ENC_CFG_PREFIX "trellis", false,
              ENC_TRELLIS_TEXT, ENC_TRELLIS_LONGTEXT )
    add_float( ENC_CFG_PREFIX "qscale", 3,
               ENC_QSCALE_TEXT, ENC_QSCALE_LONGTEXT )
    add_integer( ENC_CFG_PREFIX "strict", 0,
                 ENC_STRICT_TEXT, ENC_STRICT_LONGTEXT )
        change_integer_range( -2, 2 )
    add_float( ENC_CFG_PREFIX "lumi-masking", 0.0,
               ENC_LUMI_MASKING_TEXT, ENC_LUMI_MASKING_LONGTEXT )
    add_float( ENC_CFG_PREFIX "dark-masking", 0.0,
               ENC_DARK_MASKING_TEXT, ENC_DARK_MASKING_LONGTEXT )
    add_float( ENC_CFG_PREFIX "p-masking", 0.0,
               ENC_P_MASKING_TEXT, ENC_P_MASKING_LONGTEXT )
    add_float( ENC_CFG_PREFIX "border-masking", 0.0,
               ENC_BORDER_MASKING_TEXT, ENC_BORDER_MASKING_LONGTEXT )
    add_integer( ENC_CFG_PREFIX "luma-elim-threshold", 0,
                 ENC_LUMA_ELIM_TEXT, ENC_LUMA_ELIM_LONGTEXT )
    add_integer( ENC_CFG_PREFIX "chroma-elim-threshold", 0,
                 ENC_CHROMA_ELIM_TEXT, ENC_CHROMA_ELIM_LONGTEXT )

    /* Audio AAC encoder profile */
    add_string( ENC_CFG_PREFIX "aac-profile", "low",
                ENC_PROFILE_TEXT, ENC_PROFILE_LONGTEXT )

    add_string( ENC_CFG_PREFIX "options", NULL, AV_OPTIONS_TEXT, AV_OPTIONS_LONGTEXT )
#endif /* ENABLE_SOUT */

#ifdef MERGE_FFMPEG
    add_submodule ()
# ifdef HAVE_LIBAVFORMAT_AVFORMAT_H
#   include "../../demux/avformat/avformat.c"
# endif
    add_submodule ()
        AVIO_MODULE
    add_submodule ()
        AVPARSER_MODULE
#endif
vlc_module_end ()

AVCodecContext *ffmpeg_AllocContext( decoder_t *p_dec,
                                     const AVCodec **restrict codecp )
{
    enum AVCodecID i_codec_id;
    const char *psz_namecodec;
    const AVCodec *p_codec = NULL;

    /* *** determine codec type *** */
    if( !GetFfmpegCodec( p_dec->fmt_in->i_cat, p_dec->fmt_in->i_codec,
                         &i_codec_id, &psz_namecodec ) ||
         i_codec_id == AV_CODEC_ID_RAWVIDEO )
         return NULL;

    msg_Dbg( p_dec, "using %s %s", AVPROVIDER(LIBAVCODEC), LIBAVCODEC_IDENT );

    /* Initialization must be done before avcodec_find_decoder() */
    vlc_init_avcodec(VLC_OBJECT(p_dec));

    /* *** ask ffmpeg for a decoder *** */
    char *psz_decoder = var_InheritString( p_dec, "avcodec-codec" );
    if( psz_decoder != NULL )
    {
        p_codec = avcodec_find_decoder_by_name( psz_decoder );
        if( !p_codec )
            msg_Err( p_dec, "Decoder `%s' not found", psz_decoder );
        else if( p_codec->id != i_codec_id )
        {
            msg_Err( p_dec, "Decoder `%s' can't handle %4.4s",
                    psz_decoder, (char*)&p_dec->fmt_in->i_codec );
            p_codec = NULL;
        }
        free( psz_decoder );
    }
    if( !p_codec )
        p_codec = avcodec_find_decoder( i_codec_id );
    if( !p_codec )
    {
        msg_Dbg( p_dec, "codec not found (%s)", psz_namecodec );
        return NULL;
    }

    *codecp = p_codec;

    /* *** get a p_context *** */
    AVCodecContext *avctx = avcodec_alloc_context3(p_codec);
    if( unlikely(avctx == NULL) )
        return NULL;

    avctx->debug = var_InheritInteger( p_dec, "avcodec-debug" );
    avctx->opaque = p_dec;
    return avctx;
}

/*****************************************************************************
 * ffmpeg_OpenCodec:
 *****************************************************************************/
int ffmpeg_OpenCodec( decoder_t *p_dec, AVCodecContext *ctx,
                      const AVCodec *codec )
{
    char *psz_opts = var_InheritString( p_dec, "avcodec-options" );
    AVDictionary *options = NULL;
    int ret;

    if (psz_opts) {
        vlc_av_get_options(psz_opts, &options);
        free(psz_opts);
    }

    vlc_avcodec_lock();
    ret = avcodec_open2( ctx, codec, options ? &options : NULL );
    vlc_avcodec_unlock();

    AVDictionaryEntry *t = NULL;
    while ((t = av_dict_get(options, "", t, AV_DICT_IGNORE_SUFFIX))) {
        msg_Err( p_dec, "Unknown option \"%s\"", t->key );
    }
    av_dict_free(&options);

    if( ret < 0 )
    {
        msg_Err( p_dec, "cannot start codec (%s)", codec->name );
        return VLC_EGENERIC;
    }

    msg_Dbg( p_dec, "codec (%s) started", codec->name );
    return VLC_SUCCESS;
}
