mpegvideo.c

从FFMPEG转换而来的H264解码程序,VC下编译..

        /* Allocate MB type table */
        CHECKED_ALLOCZ(s->mb_type  , mb_array_size * sizeof(uint16_t)) //needed for encoding

        CHECKED_ALLOCZ(s->lambda_table, mb_array_size * sizeof(int))

        CHECKED_ALLOCZ(s->q_intra_matrix, 64*32 * sizeof(int))
        CHECKED_ALLOCZ(s->q_inter_matrix, 64*32 * sizeof(int))
        CHECKED_ALLOCZ(s->q_intra_matrix16, 64*32*2 * sizeof(uint16_t))
        CHECKED_ALLOCZ(s->q_inter_matrix16, 64*32*2 * sizeof(uint16_t))
        CHECKED_ALLOCZ(s->input_picture, MAX_PICTURE_COUNT * sizeof(Picture*))
        CHECKED_ALLOCZ(s->reordered_input_picture, MAX_PICTURE_COUNT * sizeof(Picture*))

        if(s->avctx->noise_reduction){
            CHECKED_ALLOCZ(s->dct_offset, 2 * 64 * sizeof(uint16_t))
        }
    }
    CHECKED_ALLOCZ(s->picture, MAX_PICTURE_COUNT * sizeof(Picture))

    CHECKED_ALLOCZ(s->error_status_table, mb_array_size*sizeof(uint8_t))

    if(s->codec_id==CODEC_ID_MPEG4 || (s->flags & CODEC_FLAG_INTERLACED_ME)){
        /* interlaced direct mode decoding tables */
            for(i=0; i<2; i++){
                int j, k;
                for(j=0; j<2; j++){
                    for(k=0; k<2; k++){
                        CHECKED_ALLOCZ(s->b_field_mv_table_base[i][j][k]     , mv_table_size * 2 * sizeof(int16_t))
                        s->b_field_mv_table[i][j][k]    = s->b_field_mv_table_base[i][j][k]     + s->mb_stride + 1;
                    }
                    CHECKED_ALLOCZ(s->b_field_select_table[i][j]     , mb_array_size * 2 * sizeof(uint8_t))
                    CHECKED_ALLOCZ(s->p_field_mv_table_base[i][j]     , mv_table_size * 2 * sizeof(int16_t))
                    s->p_field_mv_table[i][j]    = s->p_field_mv_table_base[i][j]     + s->mb_stride + 1;
                }
                CHECKED_ALLOCZ(s->p_field_select_table[i]      , mb_array_size * 2 * sizeof(uint8_t))
            }
    }
    if (s->out_format == FMT_H263) {
        /* ac values */
        CHECKED_ALLOCZ(s->ac_val_base, yc_size * sizeof(int16_t) * 16);
        s->ac_val[0] = s->ac_val_base + s->b8_stride + 1;
        s->ac_val[1] = s->ac_val_base + y_size + s->mb_stride + 1;
        s->ac_val[2] = s->ac_val[1] + c_size;

        /* cbp values */
        CHECKED_ALLOCZ(s->coded_block_base, y_size);
        s->coded_block= s->coded_block_base + s->b8_stride + 1;

        /* cbp, ac_pred, pred_dir */
        CHECKED_ALLOCZ(s->cbp_table  , mb_array_size * sizeof(uint8_t))
        CHECKED_ALLOCZ(s->pred_dir_table, mb_array_size * sizeof(uint8_t))
    }

    if (s->h263_pred || s->h263_plus || !s->encoding) {
        /* dc values */
        //MN: we need these for error resilience of intra-frames
        CHECKED_ALLOCZ(s->dc_val_base, yc_size * sizeof(int16_t));
        s->dc_val[0] = s->dc_val_base + s->b8_stride + 1;
        s->dc_val[1] = s->dc_val_base + y_size + s->mb_stride + 1;
        s->dc_val[2] = s->dc_val[1] + c_size;
        for(i=0;i<yc_size;i++)
            s->dc_val_base[i] = 1024;
    }

    /* which mb is a intra block */
    CHECKED_ALLOCZ(s->mbintra_table, mb_array_size);
    memset(s->mbintra_table, 1, mb_array_size);

    /* init macroblock skip table */
    CHECKED_ALLOCZ(s->mbskip_table, mb_array_size+2);
    //Note the +1 is for a quicker mpeg4 slice_end detection
    CHECKED_ALLOCZ(s->prev_pict_types, PREV_PICT_TYPES_BUFFER_SIZE);

    s->parse_context.state= -1;
    if((s->avctx->debug&(FF_DEBUG_VIS_QP|FF_DEBUG_VIS_MB_TYPE)) || (s->avctx->debug_mv)){
       s->visualization_buffer[0] = av_malloc((s->mb_width*16 + 2*EDGE_WIDTH) * s->mb_height*16 + 2*EDGE_WIDTH);
       s->visualization_buffer[1] = av_malloc((s->mb_width*8 + EDGE_WIDTH) * s->mb_height*8 + EDGE_WIDTH);
       s->visualization_buffer[2] = av_malloc((s->mb_width*8 + EDGE_WIDTH) * s->mb_height*8 + EDGE_WIDTH);
    }

    s->context_initialized = 1;

    s->thread_context[0]= s;
    for(i=1; i<s->avctx->thread_count; i++){
        s->thread_context[i]= av_malloc(sizeof(MpegEncContext));
        memcpy(s->thread_context[i], s, sizeof(MpegEncContext));
    }

    for(i=0; i<s->avctx->thread_count; i++){
        if(init_duplicate_context(s->thread_context[i], s) < 0)
           goto fail;
        s->thread_context[i]->start_mb_y= (s->mb_height*(i  ) + s->avctx->thread_count/2) / s->avctx->thread_count;
        s->thread_context[i]->end_mb_y  = (s->mb_height*(i+1) + s->avctx->thread_count/2) / s->avctx->thread_count;
    }

    return 0;
 fail:
    MPV_common_end(s);
    return -1;
}

/* init common structure for both encoder and decoder */
void MPV_common_end(MpegEncContext *s)
{
    int i, j, k;

    for(i=0; i<s->avctx->thread_count; i++){
        free_duplicate_context(s->thread_context[i]);
    }
    for(i=1; i<s->avctx->thread_count; i++){
        av_freep(&s->thread_context[i]);
    }

    av_freep(&s->parse_context.buffer);
    s->parse_context.buffer_size=0;

    av_freep(&s->mb_type);
    av_freep(&s->p_mv_table_base);
    av_freep(&s->b_forw_mv_table_base);
    av_freep(&s->b_back_mv_table_base);
    av_freep(&s->b_bidir_forw_mv_table_base);
    av_freep(&s->b_bidir_back_mv_table_base);
    av_freep(&s->b_direct_mv_table_base);
    s->p_mv_table= NULL;
    s->b_forw_mv_table= NULL;
    s->b_back_mv_table= NULL;
    s->b_bidir_forw_mv_table= NULL;
    s->b_bidir_back_mv_table= NULL;
    s->b_direct_mv_table= NULL;
    for(i=0; i<2; i++){
        for(j=0; j<2; j++){
            for(k=0; k<2; k++){
                av_freep(&s->b_field_mv_table_base[i][j][k]);
                s->b_field_mv_table[i][j][k]=NULL;
            }
            av_freep(&s->b_field_select_table[i][j]);
            av_freep(&s->p_field_mv_table_base[i][j]);
            s->p_field_mv_table[i][j]=NULL;
        }
        av_freep(&s->p_field_select_table[i]);
    }

    av_freep(&s->dc_val_base);
    av_freep(&s->ac_val_base);
    av_freep(&s->coded_block_base);
    av_freep(&s->mbintra_table);
    av_freep(&s->cbp_table);
    av_freep(&s->pred_dir_table);

    av_freep(&s->mbskip_table);
    av_freep(&s->prev_pict_types);
    av_freep(&s->bitstream_buffer);
    s->allocated_bitstream_buffer_size=0;

    av_freep(&s->avctx->stats_out);
    av_freep(&s->ac_stats);
    av_freep(&s->error_status_table);
    av_freep(&s->mb_index2xy);
    av_freep(&s->lambda_table);
    av_freep(&s->q_intra_matrix);
    av_freep(&s->q_inter_matrix);
    av_freep(&s->q_intra_matrix16);
    av_freep(&s->q_inter_matrix16);
    av_freep(&s->input_picture);
    av_freep(&s->reordered_input_picture);
    av_freep(&s->dct_offset);

    if(s->picture){
        for(i=0; i<MAX_PICTURE_COUNT; i++){
            free_picture(s, &s->picture[i]);
        }
    }
    av_freep(&s->picture);
    s->context_initialized = 0;
    s->last_picture_ptr=
    s->next_picture_ptr=
    s->current_picture_ptr= NULL;
    s->linesize= s->uvlinesize= 0;

    for(i=0; i<3; i++)
        av_freep(&s->visualization_buffer[i]);

    avcodec_default_free_buffers(s->avctx);
}

#ifdef CONFIG_ENCODERS

/* init video encoder */
int MPV_encode_init(AVCodecContext *avctx)
{
    MpegEncContext *s = avctx->priv_data;
    int i;
    int chroma_h_shift, chroma_v_shift;

    MPV_encode_defaults(s);

    switch (avctx->codec_id) {
    case CODEC_ID_MPEG2VIDEO:
        if(avctx->pix_fmt != PIX_FMT_YUV420P && avctx->pix_fmt != PIX_FMT_YUV422P){
            av_log(avctx, AV_LOG_ERROR, "only YUV420 and YUV422 are supported\n");
            return -1;
        }
        break;
    case CODEC_ID_LJPEG:
    case CODEC_ID_MJPEG:
        if(avctx->pix_fmt != PIX_FMT_YUVJ420P && avctx->pix_fmt != PIX_FMT_YUVJ422P &&
           ((avctx->pix_fmt != PIX_FMT_YUV420P && avctx->pix_fmt != PIX_FMT_YUV422P) || avctx->strict_std_compliance>FF_COMPLIANCE_INOFFICIAL)){
            av_log(avctx, AV_LOG_ERROR, "colorspace not supported in jpeg\n");
            return -1;
        }
        break;
    default:
        if(avctx->pix_fmt != PIX_FMT_YUV420P){
            av_log(avctx, AV_LOG_ERROR, "only YUV420 is supported\n");
            return -1;
        }
    }

    switch (avctx->pix_fmt) {
    case PIX_FMT_YUVJ422P:
    case PIX_FMT_YUV422P:
        s->chroma_format = CHROMA_422;
        break;
    case PIX_FMT_YUVJ420P:
    case PIX_FMT_YUV420P:
    default:
        s->chroma_format = CHROMA_420;
        break;
    }

    s->bit_rate = avctx->bit_rate;
    s->width = avctx->width;
    s->height = avctx->height;
    if(avctx->gop_size > 600 && avctx->strict_std_compliance>FF_COMPLIANCE_EXPERIMENTAL){
        av_log(avctx, AV_LOG_ERROR, "Warning keyframe interval too large! reducing it ...\n");
        avctx->gop_size=600;
    }
    s->gop_size = avctx->gop_size;
    s->avctx = avctx;
    s->flags= avctx->flags;
    s->flags2= avctx->flags2;
    s->max_b_frames= avctx->max_b_frames;
    s->codec_id= avctx->codec->id;
    s->luma_elim_threshold  = avctx->luma_elim_threshold;
    s->chroma_elim_threshold= avctx->chroma_elim_threshold;
    s->strict_std_compliance= avctx->strict_std_compliance;
    s->data_partitioning= avctx->flags & CODEC_FLAG_PART;
    s->quarter_sample= (avctx->flags & CODEC_FLAG_QPEL)!=0;
    s->mpeg_quant= avctx->mpeg_quant;
    s->rtp_mode= !!avctx->rtp_payload_size;
    s->intra_dc_precision= avctx->intra_dc_precision;
    s->user_specified_pts = AV_NOPTS_VALUE;

    if (s->gop_size <= 1) {
        s->intra_only = 1;
        s->gop_size = 12;
    } else {
        s->intra_only = 0;
    }

    s->me_method = avctx->me_method;

    /* Fixed QSCALE */
    s->fixed_qscale = !!(avctx->flags & CODEC_FLAG_QSCALE);

    s->adaptive_quant= (   s->avctx->lumi_masking
                        || s->avctx->dark_masking
                        || s->avctx->temporal_cplx_masking
                        || s->avctx->spatial_cplx_masking
                        || s->avctx->p_masking
                        || s->avctx->border_masking
                        || (s->flags&CODEC_FLAG_QP_RD))
                       ;//&& !s->fixed_qscale; /* intentional difference ??? */

    s->obmc= !!(s->flags & CODEC_FLAG_OBMC);
    s->loop_filter= !!(s->flags & CODEC_FLAG_LOOP_FILTER);
    s->alternate_scan= !!(s->flags & CODEC_FLAG_ALT_SCAN);
    s->intra_vlc_format= !!(s->flags2 & CODEC_FLAG2_INTRA_VLC);
    s->q_scale_type= !!(s->flags2 & CODEC_FLAG2_NON_LINEAR_QUANT);

    if(avctx->rc_max_rate && !avctx->rc_buffer_size){
        av_log(avctx, AV_LOG_ERROR, "a vbv buffer size is needed, for encoding with a maximum bitrate\n");
        return -1;
    }

    if(avctx->rc_min_rate && avctx->rc_max_rate != avctx->rc_min_rate){
        av_log(avctx, AV_LOG_INFO, "Warning min_rate > 0 but min_rate != max_rate isn't recommended!\n");
    }

    if(avctx->rc_min_rate && avctx->rc_min_rate > avctx->bit_rate){
        av_log(avctx, AV_LOG_ERROR, "bitrate below min bitrate\n");
        return -1;
    }

    if(avctx->rc_max_rate && avctx->rc_max_rate < avctx->bit_rate){
        av_log(avctx, AV_LOG_INFO, "bitrate above max bitrate\n");
        return -1;
    }

    if(avctx->rc_buffer_size && avctx->bit_rate*av_q2d(avctx->time_base) > avctx->rc_buffer_size){
        av_log(avctx, AV_LOG_ERROR, "VBV buffer too small for bitrate\n");
        return -1;
    }

    if(avctx->bit_rate*av_q2d(avctx->time_base) > avctx->bit_rate_tolerance){
        av_log(avctx, AV_LOG_ERROR, "bitrate tolerance too small for bitrate\n");
        return -1;
    }

    if(   s->avctx->rc_max_rate && s->avctx->rc_min_rate == s->avctx->rc_max_rate
       && (s->codec_id == CODEC_ID_MPEG1VIDEO || s->codec_id == CODEC_ID_MPEG2VIDEO)
       && 90000LL * (avctx->rc_buffer_size-1) > s->avctx->rc_max_rate*0xFFFFLL){

        av_log(avctx, AV_LOG_INFO, "Warning vbv_delay will be set to 0xFFFF (=VBR) as the specified vbv buffer is too large for the given bitrate!\n");
    }

    if((s->flags & CODEC_FLAG_4MV) && s->codec_id != CODEC_ID_MPEG4
       && s->codec_id != CODEC_ID_H263 && s->codec_id != CODEC_ID_H263P && s->codec_id != CODEC_ID_FLV1){
        av_log(avctx, AV_LOG_ERROR, "4MV not supported by codec\n");
        return -1;
    }

    if(s->obmc && s->avctx->mb_decision != FF_MB_DECISION_SIMPLE){
        av_log(avctx, AV_LOG_ERROR, "OBMC is only supported with simple mb decision\n");
        return -1;
    }

    if(s->obmc && s->codec_id != CODEC_ID_H263 && s->codec_id != CODEC_ID_H263P){
        av_log(avctx, AV_LOG_ERROR, "OBMC is only supported with H263(+)\n");
        return -1;
    }

    if(s->quarter_sample && s->codec_id != CODEC_ID_MPEG4){
        av_log(avctx, AV_LOG_ERROR, "qpel not supported by codec\n");
        return -1;
    }

    if(s->data_partitioning && s->codec_id != CODEC_ID_MPEG4){
        av_log(avctx, AV_LOG_ERROR, "data partitioning not supported by codec\n");
        return -1;
    }

    if(s->max_b_frames && s->codec_id != CODEC_ID_MPEG4 && s->codec_id != CODEC_ID_MPEG1VIDEO && s->codec_id != CODEC_ID_MPEG2VIDEO){
        av_log(avctx, AV_LOG_ERROR, "b frames not supported by codec\n");
        return -1;
    }

    if((s->flags & (CODEC_FLAG_INTERLACED_DCT|CODEC_FLAG_INTERLACED_ME|CODEC_FLAG_ALT_SCAN))
       && s->codec_id != CODEC_ID_MPEG4 && s->codec_id != CODEC_ID_MPEG2VIDEO){
        av_log(avctx, AV_LOG_ERROR, "interlacing not supported by codec\n");
        return -1;
    }

/*