FFmpeg: libavcodec/vaapi_mpeg2.c Source File

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 start_code av_unused, 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     start_code = get_bits(&gb, 32);
00119     assert((start_code & 0xffffff00) == 0x00000100);
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     .capabilities   = 0,
00147     .start_frame    = vaapi_mpeg2_start_frame,
00148     .end_frame      = vaapi_mpeg2_end_frame,
00149     .decode_slice   = vaapi_mpeg2_decode_slice,
00150     .priv_data_size = 0,
00151 };