encoder.c

来自「VLC媒体播放程序」· C语言 代码 · 共 773 行 · 第 1/2 页

            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;
        }
    }

    return 0;
}
#endif

/****************************************************************************
 * 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 LIBAVCODEC_BUILD >= 4702
    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( p_enc, &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, VLC_FALSE ) )
            {
                msg_Err( p_enc, "cannot spawn encoder thread, expect to die soon" );
                return NULL;
            }
        }

        p_sys->p_context->execute = FfmpegExecute;
    }
#endif

    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;
    }

    /* Set the pts of the frame being encoded (segfaults with mpeg4!)*/
    if( p_enc->fmt_out.i_codec == VLC_FOURCC( 'm', 'p', 'g', 'v' ) ||
        p_enc->fmt_out.i_codec == VLC_FOURCC( 'm', 'p', '1', 'v' ) ||
        p_enc->fmt_out.i_codec == VLC_FOURCC( 'm', 'p', '2', 'v' ) )
    {
        frame.pts = p_pict->date;

        if ( p_enc->b_hurry_up )
        {
            mtime_t current_date = mdate();
#if LIBAVCODEC_BUILD >= 4702
            struct thread_context_t ** pp_contexts =
                (struct thread_context_t **)p_sys->p_context->thread_opaque;
#endif

            if ( frame.pts && current_date + HURRY_UP_GUARD3 > frame.pts )
            {
                p_sys->p_context->mb_decision = FF_MB_DECISION_SIMPLE;
                p_sys->p_context->flags &= ~CODEC_FLAG_TRELLIS_QUANT;
#if LIBAVCODEC_BUILD >= 4702
                if ( p_enc->i_threads >= 2 )
                {
                    int i;

                    for ( i = 0; i < p_enc->i_threads; i++ )
                    {
                        vlc_thread_set_priority( pp_contexts[i],
                                            VLC_THREAD_PRIORITY_VIDEO + 4 );
                    }
                }
#endif
                msg_Dbg( p_enc, "hurry up mode 3" );
            }
            else
            {
                p_sys->p_context->mb_decision = p_enc->i_hq;

                if ( frame.pts && current_date + HURRY_UP_GUARD2 > frame.pts )
                {
                    p_sys->p_context->flags &= ~CODEC_FLAG_TRELLIS_QUANT;
#if LIBAVCODEC_BUILD >= 4702
                    if ( p_enc->i_threads >= 2 )
                    {
                        int i;

                        for ( i = 0; i < p_enc->i_threads; i++ )
                        {
                            vlc_thread_set_priority( pp_contexts[i],
                                             VLC_THREAD_PRIORITY_VIDEO + 2 );
                        }
                    }
#endif
                    msg_Dbg( p_enc, "hurry up mode 2" );
                }
                else
                {
                    if ( p_enc->b_trellis )
                        p_sys->p_context->flags |= CODEC_FLAG_TRELLIS_QUANT;

#if LIBAVCODEC_BUILD >= 4702
                    if ( p_enc->i_threads >= 2 )
                    {
                        int i;

                        for ( i = 0; i < p_enc->i_threads; i++ )
                        {
                            vlc_thread_set_priority( pp_contexts[i],
                                                   VLC_THREAD_PRIORITY_VIDEO );
                        }
                    }
#endif
                }
            }

#if LIBAVCODEC_BUILD >= 4690
            if ( frame.pts && current_date + HURRY_UP_GUARD1 > frame.pts )
            {
                p_sys->p_context->noise_reduction = p_enc->i_noise_reduction
                         + (HURRY_UP_GUARD1 + current_date - frame.pts) / 1500;
            }
            else
            {
                p_sys->p_context->noise_reduction = p_enc->i_noise_reduction;
            }
#endif
        }
    }
    else
    {
        frame.pts = 0;
    }

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

    frame.repeat_pict = p_pict->i_nb_fields;
#if LIBAVCODEC_BUILD >= 4685
    frame.interlaced_frame = !p_pict->b_progressive;
    frame.top_field_first = p_pict->b_top_field_first;
#endif

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

        if( 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;

            /* FIXME, 3-2 pulldown is not handled correctly */
            p_block->i_length = I64C(1000000) *
                p_enc->fmt_in.video.i_frame_rate_base /
                p_enc->fmt_in.video.i_frame_rate;
            p_block->i_pts    = p_sys->p_context->coded_frame->pts;

            if( !p_sys->p_context->delay ||
                ( 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_length = I64C(1000000) *
                p_enc->fmt_in.video.i_frame_rate_base /
                p_enc->fmt_in.video.i_frame_rate;
            p_block->i_dts = p_block->i_pts = p_pict->date;
        }

        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;

    char *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,
                                      2 * AVCODEC_MAX_AUDIO_FRAME_SIZE,
                                      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 E_(CloseEncoder)( vlc_object_t *p_this )
{
    encoder_t *p_enc = (encoder_t *)p_this;
    encoder_sys_t *p_sys = p_enc->p_sys;

#if LIBAVCODEC_BUILD >= 4702
    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++ )
        {
            pp_contexts[i]->b_die = 1;
            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_destroy( pp_contexts[i] );
        }

        free(pp_contexts);
    }
#endif

    avcodec_close( p_sys->p_context );
    free( p_sys->p_context );

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

    free( p_sys );
}