00001 /* 00002 * MPEG-2 HW decode acceleration through VA API 00003 * 00004 * Copyright (C) 2008-2009 Splitted-Desktop Systems 00005 * 00006 * This file is part of FFmpeg. 00007 * 00008 * FFmpeg is free software; you can redistribute it and/or 00009 * modify it under the terms of the GNU Lesser General Public 00010 * License as published by the Free Software Foundation; either 00011 * version 2.1 of the License, or (at your option) any later version. 00012 * 00013 * FFmpeg is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00016 * Lesser General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU Lesser General Public 00019 * License along with FFmpeg; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 */ 00022 00023 #include "vaapi_internal.h" 00024 #include "dsputil.h" 00025 00027 static inline int mpeg2_get_f_code(MpegEncContext *s) 00028 { 00029 return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) | 00030 (s->mpeg_f_code[1][0] << 4) | s->mpeg_f_code[1][1]; 00031 } 00032 00034 static inline int mpeg2_get_is_frame_start(MpegEncContext *s) 00035 { 00036 return s->first_field || s->picture_structure == PICT_FRAME; 00037 } 00038 00039 static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size) 00040 { 00041 struct MpegEncContext * const s = avctx->priv_data; 00042 struct vaapi_context * const vactx = avctx->hwaccel_context; 00043 VAPictureParameterBufferMPEG2 *pic_param; 00044 VAIQMatrixBufferMPEG2 *iq_matrix; 00045 int i; 00046 00047 av_dlog(avctx, "vaapi_mpeg2_start_frame()\n"); 00048 00049 vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2); 00050 00051 /* Fill in VAPictureParameterBufferMPEG2 */ 00052 pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2)); 00053 if (!pic_param) 00054 return -1; 00055 pic_param->horizontal_size = s->width; 00056 pic_param->vertical_size = s->height; 00057 pic_param->forward_reference_picture = VA_INVALID_ID; 00058 pic_param->backward_reference_picture = VA_INVALID_ID; 00059 pic_param->picture_coding_type = s->pict_type; 00060 pic_param->f_code = mpeg2_get_f_code(s); 00061 pic_param->picture_coding_extension.value = 0; /* reset all bits */ 00062 pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision; 00063 pic_param->picture_coding_extension.bits.picture_structure = s->picture_structure; 00064 pic_param->picture_coding_extension.bits.top_field_first = s->top_field_first; 00065 pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct; 00066 pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors; 00067 pic_param->picture_coding_extension.bits.q_scale_type = s->q_scale_type; 00068 pic_param->picture_coding_extension.bits.intra_vlc_format = s->intra_vlc_format; 00069 pic_param->picture_coding_extension.bits.alternate_scan = s->alternate_scan; 00070 pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field; 00071 pic_param->picture_coding_extension.bits.progressive_frame = s->progressive_frame; 00072 pic_param->picture_coding_extension.bits.is_first_field = mpeg2_get_is_frame_start(s); 00073 00074 switch (s->pict_type) { 00075 case AV_PICTURE_TYPE_B: 00076 pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture); 00077 // fall-through 00078 case AV_PICTURE_TYPE_P: 00079 pic_param->forward_reference_picture = ff_vaapi_get_surface_id(&s->last_picture); 00080 break; 00081 } 00082 00083 /* Fill in VAIQMatrixBufferMPEG2 */ 00084 iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2)); 00085 if (!iq_matrix) 00086 return -1; 00087 iq_matrix->load_intra_quantiser_matrix = 1; 00088 iq_matrix->load_non_intra_quantiser_matrix = 1; 00089 iq_matrix->load_chroma_intra_quantiser_matrix = 1; 00090 iq_matrix->load_chroma_non_intra_quantiser_matrix = 1; 00091 00092 for (i = 0; i < 64; i++) { 00093 int n = s->dsp.idct_permutation[ff_zigzag_direct[i]]; 00094 iq_matrix->intra_quantiser_matrix[i] = s->intra_matrix[n]; 00095 iq_matrix->non_intra_quantiser_matrix[i] = s->inter_matrix[n]; 00096 iq_matrix->chroma_intra_quantiser_matrix[i] = s->chroma_intra_matrix[n]; 00097 iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n]; 00098 } 00099 return 0; 00100 } 00101 00102 static int vaapi_mpeg2_end_frame(AVCodecContext *avctx) 00103 { 00104 return ff_vaapi_common_end_frame(avctx->priv_data); 00105 } 00106 00107 static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size) 00108 { 00109 MpegEncContext * const s = avctx->priv_data; 00110 VASliceParameterBufferMPEG2 *slice_param; 00111 GetBitContext gb; 00112 uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset; 00113 00114 av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size); 00115 00116 /* Determine macroblock_offset */ 00117 init_get_bits(&gb, buffer, 8 * size); 00118 if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */ 00119 return AVERROR_INVALIDDATA; 00120 quantiser_scale_code = get_bits(&gb, 5); 00121 intra_slice_flag = get_bits1(&gb); 00122 if (intra_slice_flag) { 00123 skip_bits(&gb, 8); 00124 while (get_bits1(&gb) != 0) 00125 skip_bits(&gb, 8); 00126 } 00127 macroblock_offset = get_bits_count(&gb); 00128 00129 /* Fill in VASliceParameterBufferMPEG2 */ 00130 slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size); 00131 if (!slice_param) 00132 return -1; 00133 slice_param->macroblock_offset = macroblock_offset; 00134 slice_param->slice_horizontal_position = s->mb_x; 00135 slice_param->slice_vertical_position = s->mb_y; 00136 slice_param->quantiser_scale_code = quantiser_scale_code; 00137 slice_param->intra_slice_flag = intra_slice_flag; 00138 return 0; 00139 } 00140 00141 AVHWAccel ff_mpeg2_vaapi_hwaccel = { 00142 .name = "mpeg2_vaapi", 00143 .type = AVMEDIA_TYPE_VIDEO, 00144 .id = CODEC_ID_MPEG2VIDEO, 00145 .pix_fmt = PIX_FMT_VAAPI_VLD, 00146 .start_frame = vaapi_mpeg2_start_frame, 00147 .end_frame = vaapi_mpeg2_end_frame, 00148 .decode_slice = vaapi_mpeg2_decode_slice, 00149 };