encoder.c

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/*****************************************************************************
 * encoder.c: video and audio encoder using the ffmpeg library
 *****************************************************************************
 * Copyright (C) 1999-2001 VideoLAN
 * $Id: encoder.c,v 1.23 2004/02/21 22:41:49 gbazin Exp $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Gildas Bazin <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <vlc/vlc.h>
#include <vlc/vout.h>
#include <vlc/aout.h>
#include <vlc/decoder.h>

/* ffmpeg header */
#define HAVE_MMX
#ifdef HAVE_FFMPEG_AVCODEC_H
#   include <ffmpeg/avcodec.h>
#else
#   include <avcodec.h>
#endif

#include "ffmpeg.h"

#define AVCODEC_MAX_VIDEO_FRAME_SIZE (3*1024*1024)
#define HURRY_UP_GUARD1 (1000000)
#define HURRY_UP_GUARD2 (1000000)
#define HURRY_UP_GUARD3 (200000)

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
int  E_(OpenEncoder) ( vlc_object_t * );
void E_(CloseEncoder)( vlc_object_t * );

static block_t *EncodeVideo( encoder_t *, picture_t * );
static block_t *EncodeAudio( encoder_t *, aout_buffer_t * );

struct thread_context_t;
static int FfmpegThread( struct thread_context_t *p_context );
static int FfmpegExecute( AVCodecContext *s,
                          int (*pf_func)(AVCodecContext *c2, void *arg2),
                          void **arg, int *ret, int count );

/*****************************************************************************
 * thread_context_t : for multithreaded encoding
 *****************************************************************************/
#if LIBAVCODEC_BUILD >= 4702
struct thread_context_t
{
    VLC_COMMON_MEMBERS

    AVCodecContext  *p_context;
    int             (* pf_func)(AVCodecContext *c, void *arg);
    void            *arg;
    int             i_ret;

    vlc_mutex_t     lock;
    vlc_cond_t      cond;
    vlc_bool_t      b_work, b_done;
};
#endif

/*****************************************************************************
 * encoder_sys_t : ffmpeg encoder descriptor
 *****************************************************************************/
struct encoder_sys_t
{
    /*
     * Ffmpeg properties
     */
    AVCodec         *p_codec;
    AVCodecContext  *p_context;

    /*
     * Common properties
     */
    char *p_buffer;
    char *p_buffer_out;

    /*
     * Video properties
     */
    mtime_t i_last_ref_pts;
    mtime_t i_buggy_pts_detect;
    vlc_bool_t b_inited;

    /*
     * Audio properties
     */
    int i_frame_size;
    int i_samples_delay;
    mtime_t i_pts;
};

/*****************************************************************************
 * OpenEncoder: probe the encoder
 *****************************************************************************/
extern int16_t ff_mpeg4_default_intra_matrix[];
extern int16_t ff_mpeg4_default_non_intra_matrix[];

int E_(OpenEncoder)( vlc_object_t *p_this )
{
    encoder_t *p_enc = (encoder_t *)p_this;
    encoder_sys_t *p_sys = p_enc->p_sys;
    AVCodecContext *p_context;
    AVCodec *p_codec;
    int i_codec_id, i_cat;
    char *psz_namecodec;

    if( !E_(GetFfmpegCodec)( p_enc->fmt_out.i_codec, &i_cat, &i_codec_id,
                             &psz_namecodec ) )
    {
        if( E_(GetFfmpegChroma)( p_enc->fmt_out.i_codec ) < 0 )
        {
            /* handed chroma output */
            return VLC_EGENERIC;
        }
        i_cat      = VIDEO_ES;
        i_codec_id = CODEC_ID_RAWVIDEO;
        psz_namecodec = "Raw video";
    }


    if( p_enc->fmt_out.i_cat == VIDEO_ES && i_cat != VIDEO_ES )
    {
        msg_Err( p_enc, "\"%s\" is not a video encoder", psz_namecodec );
        return VLC_EGENERIC;
    }

    if( p_enc->fmt_out.i_cat == AUDIO_ES && i_cat != AUDIO_ES )
    {
        msg_Err( p_enc, "\"%s\" is not an audio encoder", psz_namecodec );
        return VLC_EGENERIC;
    }

    /* Initialization must be done before avcodec_find_decoder() */
    E_(InitLibavcodec)(p_this);

    p_codec = avcodec_find_encoder( i_codec_id );
    if( !p_codec )
    {
        msg_Err( p_enc, "cannot find encoder %s", psz_namecodec );
        return VLC_EGENERIC;
    }

    /* Allocate the memory needed to store the decoder's structure */
    if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
    {
        msg_Err( p_enc, "out of memory" );
        return VLC_EGENERIC;
    }
    p_enc->p_sys = p_sys;
    p_sys->p_codec = p_codec;

    p_enc->pf_encode_video = EncodeVideo;
    p_enc->pf_encode_audio = EncodeAudio;

    p_sys->p_buffer_out = NULL;
    p_sys->p_buffer = NULL;
    p_sys->b_inited = 0;

    p_sys->p_context = p_context = avcodec_alloc_context();

    /* Set CPU capabilities */
    p_context->dsp_mask = 0;
    if( !(p_enc->p_libvlc->i_cpu & CPU_CAPABILITY_MMX) )
    {
        p_context->dsp_mask |= FF_MM_MMX;
    }
    if( !(p_enc->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT) )
    {
        p_context->dsp_mask |= FF_MM_MMXEXT;
    }
    if( !(p_enc->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW) )
    {
        p_context->dsp_mask |= FF_MM_3DNOW;
    }
    if( !(p_enc->p_libvlc->i_cpu & CPU_CAPABILITY_SSE) )
    {
        p_context->dsp_mask |= FF_MM_SSE;
        p_context->dsp_mask |= FF_MM_SSE2;
    }

    /* 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;

    if( p_enc->fmt_in.i_cat == VIDEO_ES )
    {
        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;

        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;

        /* 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->gop_size = p_enc->i_key_int > 0 ? p_enc->i_key_int : 50;
        p_context->max_b_frames =
            __MIN( p_enc->i_b_frames, FF_MAX_B_FRAMES );
        p_context->b_frame_strategy = 0;

#if LIBAVCODEC_BUILD >= 4687
        p_context->sample_aspect_ratio =
            (AVRational){ p_enc->fmt_in.video.i_aspect *
                          (int64_t)p_context->height / p_context->width,
                          VOUT_ASPECT_FACTOR };
#else
        p_context->aspect_ratio = ((float)p_enc->fmt_in.video.i_aspect) /
            VOUT_ASPECT_FACTOR;
#endif

        p_sys->p_buffer_out = malloc( AVCODEC_MAX_VIDEO_FRAME_SIZE );

        p_enc->fmt_in.i_codec = VLC_FOURCC('I','4','2','0');

        if ( p_enc->b_strict_rc )
        {
            p_context->rc_max_rate = p_enc->fmt_out.i_bitrate;
            p_context->rc_buffer_size = p_enc->i_rc_buffer_size;
            p_context->rc_buffer_aggressivity = p_enc->f_rc_buffer_aggressivity;
        }

        if ( p_enc->f_i_quant_factor != 0.0 )
        {
            p_context->i_quant_factor = p_enc->f_i_quant_factor;
        }

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

        if ( p_enc->b_mpeg4_matrix )
        {
            p_context->intra_matrix = ff_mpeg4_default_intra_matrix;
            p_context->inter_matrix = ff_mpeg4_default_non_intra_matrix;
        }

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

        if ( p_enc->b_interlace )
        {
            p_context->flags |= CODEC_FLAG_INTERLACED_DCT;
#if LIBAVCODEC_BUILD >= 4698
            p_context->flags |= CODEC_FLAG_INTERLACED_ME;
#endif
        }

        if ( p_enc->b_trellis )
        {
            p_context->flags |= CODEC_FLAG_TRELLIS_QUANT;
        }

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

        if( p_enc->i_vtolerance > 0 )
        {
            p_context->bit_rate_tolerance = p_enc->i_vtolerance;
        }

        p_context->mb_qmin = p_context->qmin = p_enc->i_qmin;
        p_context->mb_qmax = p_context->qmax = p_enc->i_qmax;
        p_context->max_qdiff = 3;

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

    /* 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;

    if( avcodec_open( p_context, p_codec ) )
    {
        if( p_enc->fmt_in.i_cat == AUDIO_ES && p_context->channels > 2 )
        {
            p_context->channels = 2;
            p_enc->fmt_in.audio.i_channels = 2; // FIXME
            if( avcodec_open( p_context, p_codec ) )
            {
                msg_Err( p_enc, "cannot open encoder" );
                free( p_sys );
                return VLC_EGENERIC;
            }
            msg_Warn( p_enc, "stereo mode selected (codec limitation)" );
        }
        else
        {
            msg_Err( p_enc, "cannot open encoder" );
            free( p_sys );
            return VLC_EGENERIC;
        }
    }

    p_enc->fmt_out.i_extra = p_context->extradata_size;
    p_enc->fmt_out.p_extra = p_context->extradata;
    p_context->flags &= ~CODEC_FLAG_GLOBAL_HEADER;

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

    p_sys->i_last_ref_pts = 0;
    p_sys->i_buggy_pts_detect = 0;
    p_sys->i_samples_delay = 0;
    p_sys->i_pts = 0;

    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 )
        {