| 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 FFmpeg. |
| 7 | * |
| 8 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #include "mpegutils.h" |
| 24 | #include "vaapi_internal.h" |
| 25 | |
| 26 | /** Reconstruct bitstream f_code */ |
| 27 | static 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 */ |
| 34 | static inline int mpeg2_get_is_frame_start(MpegEncContext *s) |
| 35 | { |
| 36 | return s->first_field || s->picture_structure == PICT_FRAME; |
| 37 | } |
| 38 | |
| 39 | static 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.f); |
| 77 | // fall-through |
| 78 | case AV_PICTURE_TYPE_P: |
| 79 | pic_param->forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f); |
| 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->idsp.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 | |
| 102 | static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size) |
| 103 | { |
| 104 | MpegEncContext * const s = avctx->priv_data; |
| 105 | VASliceParameterBufferMPEG2 *slice_param; |
| 106 | GetBitContext gb; |
| 107 | uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset; |
| 108 | |
| 109 | av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size); |
| 110 | |
| 111 | /* Determine macroblock_offset */ |
| 112 | init_get_bits(&gb, buffer, 8 * size); |
| 113 | if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */ |
| 114 | return AVERROR_INVALIDDATA; |
| 115 | quantiser_scale_code = get_bits(&gb, 5); |
| 116 | intra_slice_flag = get_bits1(&gb); |
| 117 | if (intra_slice_flag) { |
| 118 | skip_bits(&gb, 8); |
| 119 | if (skip_1stop_8data_bits(&gb) < 0) |
| 120 | return AVERROR_INVALIDDATA; |
| 121 | } |
| 122 | macroblock_offset = get_bits_count(&gb); |
| 123 | |
| 124 | /* Fill in VASliceParameterBufferMPEG2 */ |
| 125 | slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size); |
| 126 | if (!slice_param) |
| 127 | return -1; |
| 128 | slice_param->macroblock_offset = macroblock_offset; |
| 129 | slice_param->slice_horizontal_position = s->mb_x; |
| 130 | slice_param->slice_vertical_position = s->mb_y >> (s->picture_structure != PICT_FRAME); |
| 131 | slice_param->quantiser_scale_code = quantiser_scale_code; |
| 132 | slice_param->intra_slice_flag = intra_slice_flag; |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | AVHWAccel ff_mpeg2_vaapi_hwaccel = { |
| 137 | .name = "mpeg2_vaapi", |
| 138 | .type = AVMEDIA_TYPE_VIDEO, |
| 139 | .id = AV_CODEC_ID_MPEG2VIDEO, |
| 140 | .pix_fmt = AV_PIX_FMT_VAAPI_VLD, |
| 141 | .start_frame = vaapi_mpeg2_start_frame, |
| 142 | .end_frame = ff_vaapi_mpeg_end_frame, |
| 143 | .decode_slice = vaapi_mpeg2_decode_slice, |
| 144 | }; |