encoder.c

VLC Player Source Code

     * 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;
        }
    }

    return 0;
}

/****************************************************************************
 * EncodeVideo: the whole thing
 ****************************************************************************/
static block_t *EncodeVideo( encoder_t *p_enc, picture_t *p_pict )
{
    encoder_sys_t *p_sys = p_enc->p_sys;
    AVFrame frame;
    int i_out, i_plane;

    if ( !p_sys->b_inited && p_enc->i_threads >= 1 )
    {
        struct thread_context_t ** pp_contexts;
        int i;

        p_sys->b_inited = 1;
        pp_contexts = malloc( sizeof(struct thread_context_t *)
                                 * p_enc->i_threads );
        p_sys->p_context->thread_opaque = (void *)pp_contexts;

        for ( i = 0; i < p_enc->i_threads; i++ )
        {
            pp_contexts[i] = vlc_object_create( p_enc,
                                     sizeof(struct thread_context_t) );
            pp_contexts[i]->p_context = p_sys->p_context;
            vlc_mutex_init( &pp_contexts[i]->lock );
            vlc_cond_init( p_enc, &pp_contexts[i]->cond );
            pp_contexts[i]->b_work = 0;
            pp_contexts[i]->b_done = 0;
            if ( vlc_thread_create( pp_contexts[i], "encoder", FfmpegThread,
                                    VLC_THREAD_PRIORITY_VIDEO, false ) )
            {
                msg_Err( p_enc, "cannot spawn encoder thread, expect to die soon" );
                return NULL;
            }
        }

        p_sys->p_context->execute = FfmpegExecute;
    }

    memset( &frame, 0, sizeof( AVFrame ) );
    for( i_plane = 0; i_plane < p_pict->i_planes; i_plane++ )
    {
        frame.data[i_plane] = p_pict->p[i_plane].p_pixels;
        frame.linesize[i_plane] = p_pict->p[i_plane].i_pitch;
    }

    /* Let ffmpeg select the frame type */
    frame.pict_type = 0;

    frame.repeat_pict = p_pict->i_nb_fields - 2;
    frame.interlaced_frame = !p_pict->b_progressive;
    frame.top_field_first = !!p_pict->b_top_field_first;

    /* Set the pts of the frame being encoded (segfaults with mpeg4!)*/
    if( p_enc->fmt_out.i_codec != VLC_FOURCC( 'm', 'p', '4', 'v' ) )
    {
        frame.pts = p_pict->date ? p_pict->date : (int64_t)AV_NOPTS_VALUE;

        if ( p_sys->b_hurry_up && frame.pts != (int64_t)AV_NOPTS_VALUE )
        {
            mtime_t current_date = mdate();

            if ( current_date + HURRY_UP_GUARD3 > frame.pts )
            {
                p_sys->p_context->mb_decision = FF_MB_DECISION_SIMPLE;
#if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
                p_sys->p_context->flags &= ~CODEC_FLAG_TRELLIS_QUANT;
#else
                p_sys->p_context->trellis = 0;
#endif
                msg_Dbg( p_enc, "hurry up mode 3" );
            }
            else
            {
                p_sys->p_context->mb_decision = p_sys->i_hq;

                if ( current_date + HURRY_UP_GUARD2 > frame.pts )
                {
#if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
                    p_sys->p_context->flags &= ~CODEC_FLAG_TRELLIS_QUANT;
#else
                    p_sys->p_context->trellis = 0;
#endif
                    p_sys->p_context->noise_reduction = p_sys->i_noise_reduction
                         + (HURRY_UP_GUARD2 + current_date - frame.pts) / 500;
                    msg_Dbg( p_enc, "hurry up mode 2" );
                }
                else
                {
#if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
                    if ( p_sys->b_trellis )
                        p_sys->p_context->flags |= CODEC_FLAG_TRELLIS_QUANT;
#else
                    p_sys->p_context->trellis = p_sys->b_trellis;
#endif

                    p_sys->p_context->noise_reduction =
                        p_sys->i_noise_reduction;
                }
            }

            if ( current_date + HURRY_UP_GUARD1 > frame.pts )
            {
                frame.pict_type = FF_P_TYPE;
                /* msg_Dbg( p_enc, "hurry up mode 1 %lld", current_date + HURRY_UP_GUARD1 - frame.pts ); */
            }
        }
    }
    else
    {
        frame.pts = (int64_t)AV_NOPTS_VALUE;
    }

    if ( frame.pts != (int64_t)AV_NOPTS_VALUE && frame.pts != 0 )
    {
        if ( p_sys->i_last_pts == frame.pts )
        {
            msg_Warn( p_enc, "almost fed libavcodec with two frames with the "
                      "same PTS (%"PRId64 ")", frame.pts );
            return NULL;
        }
        else if ( p_sys->i_last_pts > frame.pts )
        {
            msg_Warn( p_enc, "almost fed libavcodec with a frame in the "
                      "past (current: %"PRId64 ", last: %"PRId64")",
                      frame.pts, p_sys->i_last_pts );
            return NULL;
        }
        else
        {
            p_sys->i_last_pts = frame.pts;
        }
    }

    frame.quality = p_sys->i_quality;

    /* Ugly work-around for stupid libavcodec behaviour */
    p_sys->i_framenum++;
    p_sys->pi_delay_pts[p_sys->i_framenum % MAX_FRAME_DELAY] = frame.pts;
    frame.pts = p_sys->i_framenum * AV_TIME_BASE *
        p_enc->fmt_in.video.i_frame_rate_base;
    frame.pts += p_enc->fmt_in.video.i_frame_rate - 1;
    frame.pts /= p_enc->fmt_in.video.i_frame_rate;
    /* End work-around */

    i_out = avcodec_encode_video( p_sys->p_context, p_sys->p_buffer_out,
                                  p_sys->i_buffer_out, &frame );

    if( i_out > 0 )
    {
        block_t *p_block = block_New( p_enc, i_out );
        memcpy( p_block->p_buffer, p_sys->p_buffer_out, i_out );

        /* FIXME, 3-2 pulldown is not handled correctly */
        p_block->i_length = INT64_C(1000000) *
            p_enc->fmt_in.video.i_frame_rate_base /
                p_enc->fmt_in.video.i_frame_rate;

        if( !p_sys->p_context->max_b_frames || !p_sys->p_context->delay )
        {
            /* No delay -> output pts == input pts */
            p_block->i_pts = p_block->i_dts = p_pict->date;
        }
        else if( p_sys->p_context->coded_frame->pts != (int64_t)AV_NOPTS_VALUE &&
            p_sys->p_context->coded_frame->pts != 0 &&
            p_sys->i_buggy_pts_detect != p_sys->p_context->coded_frame->pts )
        {
            p_sys->i_buggy_pts_detect = p_sys->p_context->coded_frame->pts;
            p_block->i_pts = p_sys->p_context->coded_frame->pts;

            /* Ugly work-around for stupid libavcodec behaviour */
            {
                int64_t i_framenum = p_block->i_pts *
                    p_enc->fmt_in.video.i_frame_rate /
                    p_enc->fmt_in.video.i_frame_rate_base / AV_TIME_BASE;

                p_block->i_pts = p_sys->pi_delay_pts[i_framenum % MAX_FRAME_DELAY];
            }
            /* End work-around */

            if( p_sys->p_context->coded_frame->pict_type != FF_I_TYPE &&
                p_sys->p_context->coded_frame->pict_type != FF_P_TYPE )
            {
                p_block->i_dts = p_block->i_pts;
            }
            else
            {
                if( p_sys->i_last_ref_pts )
                {
                    p_block->i_dts = p_sys->i_last_ref_pts;
                }
                else
                {
                    /* Let's put something sensible */
                    p_block->i_dts = p_block->i_pts;
                }

                p_sys->i_last_ref_pts = p_block->i_pts;
            }
        }
        else
        {
            /* Buggy libavcodec which doesn't update coded_frame->pts
             * correctly */
            p_block->i_dts = p_block->i_pts = p_pict->date;
        }

        switch ( p_sys->p_context->coded_frame->pict_type )
        {
        case FF_I_TYPE:
            p_block->i_flags |= BLOCK_FLAG_TYPE_I;
            break;
        case FF_P_TYPE:
            p_block->i_flags |= BLOCK_FLAG_TYPE_P;
            break;
        case FF_B_TYPE:
            p_block->i_flags |= BLOCK_FLAG_TYPE_B;
            break;
        }

        return p_block;
    }

    return NULL;
}

/****************************************************************************
 * EncodeAudio: the whole thing
 ****************************************************************************/
static block_t *EncodeAudio( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
{
    encoder_sys_t *p_sys = p_enc->p_sys;
    block_t *p_block, *p_chain = NULL;

    uint8_t *p_buffer = p_aout_buf->p_buffer;
    int i_samples = p_aout_buf->i_nb_samples;
    int i_samples_delay = p_sys->i_samples_delay;

    p_sys->i_pts = p_aout_buf->start_date -
                (mtime_t)1000000 * (mtime_t)p_sys->i_samples_delay /
                (mtime_t)p_enc->fmt_in.audio.i_rate;

    p_sys->i_samples_delay += i_samples;

    while( p_sys->i_samples_delay >= p_sys->p_context->frame_size )
    {
        int16_t *p_samples;
        int i_out;

        if( i_samples_delay )
        {
            /* Take care of the left-over from last time */
            int i_delay_size = i_samples_delay * 2 *
                                 p_sys->p_context->channels;
            int i_size = p_sys->i_frame_size - i_delay_size;

            p_samples = (int16_t *)p_sys->p_buffer;
            memcpy( p_sys->p_buffer + i_delay_size, p_buffer, i_size );
            p_buffer -= i_delay_size;
            i_samples += i_samples_delay;
            i_samples_delay = 0;
        }
        else
        {
            p_samples = (int16_t *)p_buffer;
        }

        i_out = avcodec_encode_audio( p_sys->p_context, p_sys->p_buffer_out,
                                      p_sys->i_buffer_out, p_samples );

#if 0
        msg_Warn( p_enc, "avcodec_encode_audio: %d", i_out );
#endif
        if( i_out < 0 ) break;

        p_buffer += p_sys->i_frame_size;
        p_sys->i_samples_delay -= p_sys->p_context->frame_size;
        i_samples -= p_sys->p_context->frame_size;

        if( i_out == 0 ) continue;

        p_block = block_New( p_enc, i_out );
        memcpy( p_block->p_buffer, p_sys->p_buffer_out, i_out );

        p_block->i_length = (mtime_t)1000000 *
            (mtime_t)p_sys->p_context->frame_size /
            (mtime_t)p_sys->p_context->sample_rate;

        p_block->i_dts = p_block->i_pts = p_sys->i_pts;

        /* Update pts */
        p_sys->i_pts += p_block->i_length;
        block_ChainAppend( &p_chain, p_block );
    }

    /* Backup the remaining raw samples */
    if( i_samples )
    {
        memcpy( p_sys->p_buffer + i_samples_delay * 2 *
                p_sys->p_context->channels, p_buffer,
                i_samples * 2 * p_sys->p_context->channels );
    }

    return p_chain;
}

/*****************************************************************************
 * CloseEncoder: ffmpeg encoder destruction
 *****************************************************************************/
void CloseEncoder( vlc_object_t *p_this )
{
    encoder_t *p_enc = (encoder_t *)p_this;
    encoder_sys_t *p_sys = p_enc->p_sys;

    if ( p_sys->b_inited && p_enc->i_threads >= 1 )
    {
        int i;
        struct thread_context_t ** pp_contexts =
                (struct thread_context_t **)p_sys->p_context->thread_opaque;
        for ( i = 0; i < p_enc->i_threads; i++ )
        {
            vlc_object_kill( pp_contexts[i] );
            vlc_cond_signal( &pp_contexts[i]->cond );
            vlc_thread_join( pp_contexts[i] );
            vlc_mutex_destroy( &pp_contexts[i]->lock );
            vlc_cond_destroy( &pp_contexts[i]->cond );
            vlc_object_release( pp_contexts[i] );
        }

        free( pp_contexts );
    }

    vlc_mutex_t *lock = var_AcquireMutex( "avcodec" );
    avcodec_close( p_sys->p_context );
    vlc_mutex_unlock( lock );
    av_free( p_sys->p_context );

    free( p_sys->p_buffer );
    free( p_sys->p_buffer_out );

    free( p_sys );
}