encoder.c

uclinux 下的vlc播放器源代码

    p_sys->f_dark_masking = val.f_float;
    var_Get( p_enc, ENC_CFG_PREFIX "p-masking", &val );
    p_sys->f_p_masking = val.f_float;
    var_Get( p_enc, ENC_CFG_PREFIX "border-masking", &val );
    p_sys->f_border_masking = val.f_float;
    var_Get( p_enc, ENC_CFG_PREFIX "luma-elim-threshold", &val );
    p_sys->i_luma_elim = val.i_int;
    var_Get( p_enc, ENC_CFG_PREFIX "chroma-elim-threshold", &val );
    p_sys->i_chroma_elim = val.i_int;

    if( p_enc->fmt_in.i_cat == VIDEO_ES )
    {
        int i_aspect_num, i_aspect_den;

        if( !p_enc->fmt_in.video.i_width || !p_enc->fmt_in.video.i_height )
        {
            msg_Warn( p_enc, "invalid size %ix%i", p_enc->fmt_in.video.i_width,
                      p_enc->fmt_in.video.i_height );
            free( p_sys );
            return VLC_EGENERIC;
        }

        p_context->width = p_enc->fmt_in.video.i_width;
        p_context->height = p_enc->fmt_in.video.i_height;
        if( p_enc->fmt_out.i_codec == VLC_FOURCC('m', 'p', '2', 'v')
             && (p_context->width > 720 || p_context->height > 576) )
            p_context->level = 4; /* High level */

#if LIBAVCODEC_BUILD >= 4754
        p_context->time_base.num = p_enc->fmt_in.video.i_frame_rate_base;
        p_context->time_base.den = p_enc->fmt_in.video.i_frame_rate;
#else
        p_context->frame_rate = p_enc->fmt_in.video.i_frame_rate;
        p_context->frame_rate_base= p_enc->fmt_in.video.i_frame_rate_base;
#endif

        /* Defaults from ffmpeg.c */
        p_context->qblur = 0.5;
        p_context->qcompress = 0.5;
        p_context->b_quant_offset = 1.25;
        p_context->b_quant_factor = 1.25;
        p_context->i_quant_offset = 0.0;
        p_context->i_quant_factor = -0.8;

        p_context->lumi_masking = p_sys->f_lumi_masking;
        p_context->dark_masking = p_sys->f_dark_masking;
        p_context->p_masking = p_sys->f_p_masking;
#if LIBAVCODEC_BUILD >= 4741
        p_context->border_masking = p_sys->f_border_masking;
#endif
        p_context->luma_elim_threshold = p_sys->i_luma_elim;
        p_context->chroma_elim_threshold = p_sys->i_chroma_elim;

        if( p_sys->i_key_int > 0 )
            p_context->gop_size = p_sys->i_key_int;
        p_context->max_b_frames =
            __MAX( __MIN( p_sys->i_b_frames, FF_MAX_B_FRAMES ), 0 );
        p_context->b_frame_strategy = 0;
        if( !p_context->max_b_frames  && 
            (  p_enc->fmt_out.i_codec == VLC_FOURCC('m', 'p', '2', 'v') ||
               p_enc->fmt_out.i_codec == VLC_FOURCC('m', 'p', '1', 'v') ) )
            p_context->flags |= CODEC_FLAG_LOW_DELAY;

#if LIBAVCODEC_BUILD >= 4687
        av_reduce( &i_aspect_num, &i_aspect_den,
                   p_enc->fmt_in.video.i_aspect,
                   VOUT_ASPECT_FACTOR, 1 << 30 /* something big */ );
        av_reduce( &p_context->sample_aspect_ratio.num,
                   &p_context->sample_aspect_ratio.den,
                   i_aspect_num * (int64_t)p_context->height,
                   i_aspect_den * (int64_t)p_context->width, 1 << 30 );
#else
        p_context->aspect_ratio = ((float)p_enc->fmt_in.video.i_aspect) /
            VOUT_ASPECT_FACTOR;
#endif

        p_sys->p_buffer_out = malloc( p_context->height * p_context->width * 3 );

        p_enc->fmt_in.i_codec = VLC_FOURCC('I','4','2','0');
        p_context->pix_fmt = E_(GetFfmpegChroma)( p_enc->fmt_in.i_codec );
#if LIBAVCODEC_BUILD >= 4714
        if( p_codec->pix_fmts )
        {
            const enum PixelFormat *p = p_codec->pix_fmts;
            for( ; *p != -1; p++ )
            {
                if( *p == p_context->pix_fmt ) break;
            }
            if( *p == -1 ) p_context->pix_fmt = p_codec->pix_fmts[0];
            p_enc->fmt_in.i_codec = E_(GetVlcChroma)( p_context->pix_fmt );
        }
#else
        p_enc->fmt_in.i_codec = E_(GetVlcChroma)( p_context->pix_fmt );
#endif

        if ( p_sys->b_strict_rc )
        {
            p_context->rc_max_rate = p_enc->fmt_out.i_bitrate;
            p_context->rc_buffer_size = p_sys->i_rc_buffer_size;
            /* This is from ffmpeg's ffmpeg.c : */
            p_context->rc_initial_buffer_occupancy
                = p_sys->i_rc_buffer_size * 3/4;
            p_context->rc_buffer_aggressivity = p_sys->f_rc_buffer_aggressivity;
        }

        if ( p_sys->f_i_quant_factor != 0.0 )
            p_context->i_quant_factor = p_sys->f_i_quant_factor;

#if LIBAVCODEC_BUILD >= 4690
        p_context->noise_reduction = p_sys->i_noise_reduction;
#endif

        if ( p_sys->b_mpeg4_matrix )
        {
            p_context->intra_matrix = mpeg4_default_intra_matrix;
            p_context->inter_matrix = mpeg4_default_non_intra_matrix;
        }

        if ( p_sys->b_pre_me )
        {
            p_context->pre_me = 1;
            p_context->me_pre_cmp = FF_CMP_CHROMA;
        }

        if ( p_sys->b_interlace )
        {
            if ( p_context->height <= 280 )
            {
                if ( p_context->height != 16 || p_context->width != 16 )
                    msg_Warn( p_enc,
                        "disabling interlaced video because height=%d <= 280",
                        p_context->height );
            }
            else
            {
                p_context->flags |= CODEC_FLAG_INTERLACED_DCT;
#if LIBAVCODEC_BUILD >= 4698
                if ( p_sys->b_interlace_me )
                    p_context->flags |= CODEC_FLAG_INTERLACED_ME;
            }
#endif
        }

        if ( p_sys->b_trellis )
            p_context->flags |= CODEC_FLAG_TRELLIS_QUANT;

        if ( p_sys->i_qmin > 0 && p_sys->i_qmin == p_sys->i_qmax )
            p_context->flags |= CODEC_FLAG_QSCALE;

#if LIBAVCODEC_BUILD >= 4702
        if ( p_enc->i_threads >= 1 )
            p_context->thread_count = p_enc->i_threads;
#endif

        if( p_sys->i_vtolerance > 0 )
            p_context->bit_rate_tolerance = p_sys->i_vtolerance;

        if( p_sys->i_qmin > 0 )
            p_context->mb_qmin = p_context->qmin = p_sys->i_qmin;
        if( p_sys->i_qmax > 0 )
            p_context->mb_qmax = p_context->qmax = p_sys->i_qmax;
        p_context->max_qdiff = 3;

        p_context->mb_decision = p_sys->i_hq;

        if( p_sys->i_quality )
        {
            p_context->flags |= CODEC_FLAG_QSCALE;
#if LIBAVCODEC_BUILD >= 4668
            p_context->global_quality = p_sys->i_quality;
#endif
        }
    }
    else if( p_enc->fmt_in.i_cat == AUDIO_ES )
    {
        /* work around bug in libmp3lame encoding */
        if( i_codec_id == CODEC_ID_MP3 && p_enc->fmt_in.audio.i_channels > 2 )
            p_enc->fmt_in.audio.i_channels = 2;

        p_enc->fmt_in.i_codec  = AOUT_FMT_S16_NE;
        p_context->sample_rate = p_enc->fmt_in.audio.i_rate;
        p_context->channels    = p_enc->fmt_in.audio.i_channels;
    }

    /* Misc parameters */
    p_context->bit_rate = p_enc->fmt_out.i_bitrate;

    if( i_codec_id == CODEC_ID_RAWVIDEO )
    {
        /* XXX: hack: Force same codec (will be handled by transcode) */
        p_enc->fmt_in.i_codec = p_enc->fmt_out.i_codec;
        p_context->pix_fmt = E_(GetFfmpegChroma)( p_enc->fmt_in.i_codec );
    }

    /* Make sure we get extradata filled by the encoder */
    p_context->extradata_size = 0;
    p_context->extradata = NULL;
    p_context->flags |= CODEC_FLAG_GLOBAL_HEADER;

    vlc_mutex_lock( lockval.p_address );
    if( avcodec_open( p_context, p_codec ) )
    {
        vlc_mutex_unlock( lockval.p_address );
        if( p_enc->fmt_in.i_cat == AUDIO_ES &&
             (p_context->channels > 2 || i_codec_id == CODEC_ID_MP2
               || i_codec_id == CODEC_ID_MP3) )
        {
            if( p_context->channels > 2 )
            {
                p_context->channels = 2;
                p_enc->fmt_in.audio.i_channels = 2; // FIXME
                msg_Warn( p_enc, "stereo mode selected (codec limitation)" );
            }

            if( i_codec_id == CODEC_ID_MP2 || i_codec_id == CODEC_ID_MP3 )
            {
                int i_frequency, i;

                for ( i_frequency = 0; i_frequency < 6; i_frequency++ )
                {
                    if ( p_enc->fmt_out.audio.i_rate
                            == mpa_freq_tab[i_frequency] )
                        break;
                }
                if ( i_frequency == 6 )
                {
                    msg_Err( p_enc, "MPEG audio doesn't support frequency=%d",
                             p_enc->fmt_out.audio.i_rate );
                    free( p_sys );
                    return VLC_EGENERIC;
                }

                for ( i = 1; i < 14; i++ )
                {
                    if ( p_enc->fmt_out.i_bitrate / 1000
                          <= mpa_bitrate_tab[i_frequency / 3][i] )
                        break;
                }
                if ( p_enc->fmt_out.i_bitrate / 1000
                      != mpa_bitrate_tab[i_frequency / 3][i] )
                {
                    msg_Warn( p_enc,
                              "MPEG audio doesn't support bitrate=%d, using %d",
                              p_enc->fmt_out.i_bitrate,
                              mpa_bitrate_tab[i_frequency / 3][i] * 1000 );
                    p_enc->fmt_out.i_bitrate =
                        mpa_bitrate_tab[i_frequency / 3][i] * 1000;
                    p_context->bit_rate = p_enc->fmt_out.i_bitrate;
                }
            }

            p_context->codec = NULL;
            vlc_mutex_lock( lockval.p_address );
            if( avcodec_open( p_context, p_codec ) )
            {
                vlc_mutex_unlock( lockval.p_address );
                msg_Err( p_enc, "cannot open encoder" );
                free( p_sys );
                return VLC_EGENERIC;
            }
        }
        else
        {
            msg_Err( p_enc, "cannot open encoder" );
            free( p_sys );
            return VLC_EGENERIC;
        }
    }
    vlc_mutex_unlock( lockval.p_address );

    p_enc->fmt_out.i_extra = p_context->extradata_size;
    if( p_enc->fmt_out.i_extra )
    {
        p_enc->fmt_out.p_extra = malloc( p_enc->fmt_out.i_extra );
        memcpy( p_enc->fmt_out.p_extra, p_context->extradata,
                p_enc->fmt_out.i_extra );
    }
    p_context->flags &= ~CODEC_FLAG_GLOBAL_HEADER;

    if( p_enc->fmt_in.i_cat == AUDIO_ES )
    {
        p_sys->p_buffer_out = malloc( 2 * AVCODEC_MAX_AUDIO_FRAME_SIZE );
        p_sys->i_frame_size = p_context->frame_size * 2 * p_context->channels;
        p_sys->p_buffer = malloc( p_sys->i_frame_size );
    }

    msg_Dbg( p_enc, "found encoder %s", psz_namecodec );

    return VLC_SUCCESS;
}

/****************************************************************************
 * Ffmpeg threading system
 ****************************************************************************/
#if LIBAVCODEC_BUILD >= 4702
static int FfmpegThread( struct thread_context_t *p_context )
{
    while ( !p_context->b_die && !p_context->b_error )
    {
        vlc_mutex_lock( &p_context->lock );
        while ( !p_context->b_work && !p_context->b_die && !p_context->b_error )
        {
            vlc_cond_wait( &p_context->cond, &p_context->lock );
        }
        p_context->b_work = 0;
        vlc_mutex_unlock( &p_context->lock );
        if ( p_context->b_die || p_context->b_error )
            break;

        if ( p_context->pf_func )
        {
            p_context->i_ret = p_context->pf_func( p_context->p_context,
                                                   p_context->arg );
        }

        vlc_mutex_lock( &p_context->lock );
        p_context->b_done = 1;
        vlc_cond_signal( &p_context->cond );
        vlc_mutex_unlock( &p_context->lock );
    }

    return 0;
}

static int FfmpegExecute( AVCodecContext *s,
                          int (*pf_func)(AVCodecContext *c2, void *arg2),
                          void **arg, int *ret, int count )
{
    struct thread_context_t ** pp_contexts =
                         (struct thread_context_t **)s->thread_opaque;
    int i;

    /* Note, we can be certain that this is not called with the same
     * AVCodecContext by different threads at the same time */
    for ( i = 0; i < count; i++ )
    {
        vlc_mutex_lock( &pp_contexts[i]->lock );
        pp_contexts[i]->arg = arg[i];
        pp_contexts[i]->pf_func = pf_func;
        pp_contexts[i]->i_ret = 12345;
        pp_contexts[i]->b_work = 1;
        vlc_cond_signal( &pp_contexts[i]->cond );
        vlc_mutex_unlock( &pp_contexts[i]->lock );
    }
    for ( i = 0; i < count; i++ )
    {
        vlc_mutex_lock( &pp_contexts[i]->lock );
        while ( !pp_contexts[i]->b_done )
        {
            vlc_cond_wait( &pp_contexts[i]->cond, &pp_contexts[i]->lock );
        }
        pp_contexts[i]->b_done = 0;
        pp_contexts[i]->pf_func = NULL;
        vlc_mutex_unlock( &pp_contexts[i]->lock );

        if ( ret )
        {
            ret[i] = pp_contexts[i]->i_ret;
        }
    }