1/* 2 * MPEG-2 HW decode acceleration through VA API 3 * 4 * Copyright (C) 2008-2009 Splitted-Desktop Systems 5 * 6 * This file is part of Libav. 7 * 8 * Libav is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * Libav is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with Libav; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "vaapi_internal.h" 24#include "dsputil.h" 25 26/** Reconstruct bitstream f_code */ 27static inline int mpeg2_get_f_code(MpegEncContext *s) 28{ 29 return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) | 30 (s->mpeg_f_code[1][0] << 4) | s->mpeg_f_code[1][1]; 31} 32 33/** Determine frame start: first field for field picture or frame picture */ 34static inline int mpeg2_get_is_frame_start(MpegEncContext *s) 35{ 36 return s->first_field || s->picture_structure == PICT_FRAME; 37} 38 39static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size) 40{ 41 struct MpegEncContext * const s = avctx->priv_data; 42 struct vaapi_context * const vactx = avctx->hwaccel_context; 43 VAPictureParameterBufferMPEG2 *pic_param; 44 VAIQMatrixBufferMPEG2 *iq_matrix; 45 int i; 46 47 av_dlog(avctx, "vaapi_mpeg2_start_frame()\n"); 48 49 vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2); 50 51 /* Fill in VAPictureParameterBufferMPEG2 */ 52 pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2)); 53 if (!pic_param) 54 return -1; 55 pic_param->horizontal_size = s->width; 56 pic_param->vertical_size = s->height; 57 pic_param->forward_reference_picture = VA_INVALID_ID; 58 pic_param->backward_reference_picture = VA_INVALID_ID; 59 pic_param->picture_coding_type = s->pict_type; 60 pic_param->f_code = mpeg2_get_f_code(s); 61 pic_param->picture_coding_extension.value = 0; /* reset all bits */ 62 pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision; 63 pic_param->picture_coding_extension.bits.picture_structure = s->picture_structure; 64 pic_param->picture_coding_extension.bits.top_field_first = s->top_field_first; 65 pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct; 66 pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors; 67 pic_param->picture_coding_extension.bits.q_scale_type = s->q_scale_type; 68 pic_param->picture_coding_extension.bits.intra_vlc_format = s->intra_vlc_format; 69 pic_param->picture_coding_extension.bits.alternate_scan = s->alternate_scan; 70 pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field; 71 pic_param->picture_coding_extension.bits.progressive_frame = s->progressive_frame; 72 pic_param->picture_coding_extension.bits.is_first_field = mpeg2_get_is_frame_start(s); 73 74 switch (s->pict_type) { 75 case AV_PICTURE_TYPE_B: 76 pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture); 77 // fall-through 78 case AV_PICTURE_TYPE_P: 79 pic_param->forward_reference_picture = ff_vaapi_get_surface_id(&s->last_picture); 80 break; 81 } 82 83 /* Fill in VAIQMatrixBufferMPEG2 */ 84 iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2)); 85 if (!iq_matrix) 86 return -1; 87 iq_matrix->load_intra_quantiser_matrix = 1; 88 iq_matrix->load_non_intra_quantiser_matrix = 1; 89 iq_matrix->load_chroma_intra_quantiser_matrix = 1; 90 iq_matrix->load_chroma_non_intra_quantiser_matrix = 1; 91 92 for (i = 0; i < 64; i++) { 93 int n = s->dsp.idct_permutation[ff_zigzag_direct[i]]; 94 iq_matrix->intra_quantiser_matrix[i] = s->intra_matrix[n]; 95 iq_matrix->non_intra_quantiser_matrix[i] = s->inter_matrix[n]; 96 iq_matrix->chroma_intra_quantiser_matrix[i] = s->chroma_intra_matrix[n]; 97 iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n]; 98 } 99 return 0; 100} 101 102static int vaapi_mpeg2_end_frame(AVCodecContext *avctx) 103{ 104 return ff_vaapi_common_end_frame(avctx->priv_data); 105} 106 107static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size) 108{ 109 MpegEncContext * const s = avctx->priv_data; 110 VASliceParameterBufferMPEG2 *slice_param; 111 GetBitContext gb; 112 uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset; 113 114 av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size); 115 116 /* Determine macroblock_offset */ 117 init_get_bits(&gb, buffer, 8 * size); 118 if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */ 119 return AVERROR_INVALIDDATA; 120 quantiser_scale_code = get_bits(&gb, 5); 121 intra_slice_flag = get_bits1(&gb); 122 if (intra_slice_flag) { 123 skip_bits(&gb, 8); 124 while (get_bits1(&gb) != 0) 125 skip_bits(&gb, 8); 126 } 127 macroblock_offset = get_bits_count(&gb); 128 129 /* Fill in VASliceParameterBufferMPEG2 */ 130 slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size); 131 if (!slice_param) 132 return -1; 133 slice_param->macroblock_offset = macroblock_offset; 134 slice_param->slice_horizontal_position = s->mb_x; 135 slice_param->slice_vertical_position = s->mb_y; 136 slice_param->quantiser_scale_code = quantiser_scale_code; 137 slice_param->intra_slice_flag = intra_slice_flag; 138 return 0; 139} 140 141AVHWAccel ff_mpeg2_vaapi_hwaccel = { 142 .name = "mpeg2_vaapi", 143 .type = AVMEDIA_TYPE_VIDEO, 144 .id = CODEC_ID_MPEG2VIDEO, 145 .pix_fmt = PIX_FMT_VAAPI_VLD, 146 .start_frame = vaapi_mpeg2_start_frame, 147 .end_frame = vaapi_mpeg2_end_frame, 148 .decode_slice = vaapi_mpeg2_decode_slice, 149}; 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