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author | Gwenole Beauchesne <gbeauchesne@splitted-desktop.com> | 2009-12-29 08:48:18 +0000 |
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committer | Gwenole Beauchesne <gbeauchesne@splitted-desktop.com> | 2009-12-29 08:48:18 +0000 |
commit | 07c9f6f673a3e5699b703a26fc86da6e7ff107ee (patch) | |
tree | ddb7bbfc3e016d9f469daedd4f26f2d1eb14f239 /libavcodec/vaapi_h264.c | |
parent | 5f000d5f386601e2316a243c3e41536dfbbccf4d (diff) | |
download | ffmpeg-07c9f6f673a3e5699b703a26fc86da6e7ff107ee.tar.gz |
Add H.264 bitstream decoding through VAAPI.
Originally committed as revision 20957 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vaapi_h264.c')
-rw-r--r-- | libavcodec/vaapi_h264.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/libavcodec/vaapi_h264.c b/libavcodec/vaapi_h264.c new file mode 100644 index 0000000000..265cd3f1d2 --- /dev/null +++ b/libavcodec/vaapi_h264.c @@ -0,0 +1,360 @@ +/* + * H.264 HW decode acceleration through VA API + * + * Copyright (C) 2008-2009 Splitted-Desktop Systems + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "vaapi_internal.h" +#include "h264.h" + +/** @file + * This file implements the glue code between FFmpeg's and VA API's + * structures for H.264 decoding. + */ + +/** Reconstructs bitstream slice_type. */ +static int get_slice_type(H264Context *h) +{ + switch (h->slice_type) { + case FF_P_TYPE: return 0; + case FF_B_TYPE: return 1; + case FF_I_TYPE: return 2; + case FF_SP_TYPE: return 3; + case FF_SI_TYPE: return 4; + default: return -1; + } +} + +/** + * Initializes an empty VA API picture. + * + * VA API requires a fixed-size reference picture array. + */ +static void init_vaapi_pic(VAPictureH264 *va_pic) +{ + va_pic->picture_id = VA_INVALID_ID; + va_pic->flags = VA_PICTURE_H264_INVALID; + va_pic->TopFieldOrderCnt = 0; + va_pic->BottomFieldOrderCnt = 0; +} + +/** + * Translates an FFmpeg Picture into its VA API form. + * + * @param[out] va_pic A pointer to VA API's own picture struct + * @param[in] pic A pointer to the FFmpeg picture struct to convert + * @param[in] pic_structure The picture field type (as defined in mpegvideo.h), + * supersedes pic's field type if nonzero. + */ +static void fill_vaapi_pic(VAPictureH264 *va_pic, + Picture *pic, + int pic_structure) +{ + if (pic_structure == 0) + pic_structure = pic->reference; + + va_pic->picture_id = ff_vaapi_get_surface_id(pic); + va_pic->frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num; + + va_pic->flags = 0; + if (pic_structure != PICT_FRAME) + va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD; + if (pic->reference) + va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE; + + va_pic->TopFieldOrderCnt = 0; + if (pic->field_poc[0] != INT_MAX) + va_pic->TopFieldOrderCnt = pic->field_poc[0]; + + va_pic->BottomFieldOrderCnt = 0; + if (pic->field_poc[1] != INT_MAX) + va_pic->BottomFieldOrderCnt = pic->field_poc[1]; +} + +/** Decoded Picture Buffer (DPB). */ +typedef struct DPB { + int size; ///< Current number of reference frames in the DPB + int max_size; ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames) + VAPictureH264 *va_pics; ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array +} DPB; + +/** + * Appends picture to the decoded picture buffer, in a VA API form that + * merges the second field picture attributes with the first, if + * available. The decoded picture buffer's size must be large enough + * to receive the new VA API picture object. + */ +static int dpb_add(DPB *dpb, Picture *pic) +{ + int i; + + if (dpb->size >= dpb->max_size) + return -1; + + for (i = 0; i < dpb->size; i++) { + VAPictureH264 * const va_pic = &dpb->va_pics[i]; + if (va_pic->picture_id == ff_vaapi_get_surface_id(pic)) { + VAPictureH264 temp_va_pic; + fill_vaapi_pic(&temp_va_pic, pic, 0); + + if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) { + va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD); + /* Merge second field */ + if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) { + va_pic->TopFieldOrderCnt = temp_va_pic.TopFieldOrderCnt; + } else { + va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt; + } + } + return 0; + } + } + + fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0); + return 0; +} + +/** Fills in VA API reference frames array. */ +static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param, + H264Context *h) +{ + DPB dpb; + int i; + + dpb.size = 0; + dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames); + dpb.va_pics = pic_param->ReferenceFrames; + for (i = 0; i < dpb.max_size; i++) + init_vaapi_pic(&dpb.va_pics[i]); + + for (i = 0; i < h->short_ref_count; i++) { + Picture * const pic = h->short_ref[i]; + if (pic && pic->reference && dpb_add(&dpb, pic) < 0) + return -1; + } + + for (i = 0; i < h->long_ref_count; i++) { + Picture * const pic = h->long_ref[i]; + if (pic && pic->reference && dpb_add(&dpb, pic) < 0) + return -1; + } + return 0; +} + +/** + * Fills in VA API reference picture lists from the FFmpeg reference + * picture list. + * + * @param[out] RefPicList VA API internal reference picture list + * @param[in] ref_list A pointer to the FFmpeg reference list + * @param[in] ref_count The number of reference pictures in ref_list + */ +static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32], + Picture *ref_list, + unsigned int ref_count) +{ + unsigned int i, n = 0; + for (i = 0; i < ref_count; i++) + if (ref_list[i].reference) + fill_vaapi_pic(&RefPicList[n++], &ref_list[i], 0); + + for (; n < 32; n++) + init_vaapi_pic(&RefPicList[n]); +} + +/** + * Fills in prediction weight table. + * + * VA API requires a plain prediction weight table as it does not infer + * any value. + * + * @param[in] h A pointer to the current H.264 context + * @param[in] list The reference frame list index to use + * @param[out] luma_weight_flag VA API plain luma weight flag + * @param[out] luma_weight VA API plain luma weight table + * @param[out] luma_offset VA API plain luma offset table + * @param[out] chroma_weight_flag VA API plain chroma weight flag + * @param[out] chroma_weight VA API plain chroma weight table + * @param[out] chroma_offset VA API plain chroma offset table + */ +static void fill_vaapi_plain_pred_weight_table(H264Context *h, + int list, + unsigned char *luma_weight_flag, + short luma_weight[32], + short luma_offset[32], + unsigned char *chroma_weight_flag, + short chroma_weight[32][2], + short chroma_offset[32][2]) +{ + unsigned int i, j; + + *luma_weight_flag = h->luma_weight_flag[list]; + *chroma_weight_flag = h->chroma_weight_flag[list]; + + for (i = 0; i < h->ref_count[list]; i++) { + /* VA API also wants the inferred (default) values, not + only what is available in the bitstream (7.4.3.2). */ + if (h->luma_weight_flag[list]) { + luma_weight[i] = h->luma_weight[list][i]; + luma_offset[i] = h->luma_offset[list][i]; + } else { + luma_weight[i] = 1 << h->luma_log2_weight_denom; + luma_offset[i] = 0; + } + for (j = 0; j < 2; j++) { + if (h->chroma_weight_flag[list]) { + chroma_weight[i][j] = h->chroma_weight[list][i][j]; + chroma_offset[i][j] = h->chroma_offset[list][i][j]; + } else { + chroma_weight[i][j] = 1 << h->chroma_log2_weight_denom; + chroma_offset[i][j] = 0; + } + } + } +} + +/** Initializes and starts decoding a frame with VA API. */ +static int start_frame(AVCodecContext *avctx, + av_unused const uint8_t *buffer, + av_unused uint32_t size) +{ + H264Context * const h = avctx->priv_data; + MpegEncContext * const s = &h->s; + struct vaapi_context * const vactx = avctx->hwaccel_context; + VAPictureParameterBufferH264 *pic_param; + VAIQMatrixBufferH264 *iq_matrix; + + dprintf(avctx, "start_frame()\n"); + + vactx->slice_param_size = sizeof(VASliceParameterBufferH264); + + /* Fill in VAPictureParameterBufferH264. */ + pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264)); + if (!pic_param) + return -1; + fill_vaapi_pic(&pic_param->CurrPic, s->current_picture_ptr, s->picture_structure); + if (fill_vaapi_ReferenceFrames(pic_param, h) < 0) + return -1; + pic_param->picture_width_in_mbs_minus1 = s->mb_width - 1; + pic_param->picture_height_in_mbs_minus1 = s->mb_height - 1; + pic_param->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8; + pic_param->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8; + pic_param->num_ref_frames = h->sps.ref_frame_count; + pic_param->seq_fields.value = 0; /* reset all bits */ + pic_param->seq_fields.bits.chroma_format_idc = h->sps.chroma_format_idc; + pic_param->seq_fields.bits.residual_colour_transform_flag = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */ + pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag; + pic_param->seq_fields.bits.frame_mbs_only_flag = h->sps.frame_mbs_only_flag; + pic_param->seq_fields.bits.mb_adaptive_frame_field_flag = h->sps.mb_aff; + pic_param->seq_fields.bits.direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag; + pic_param->seq_fields.bits.MinLumaBiPredSize8x8 = h->sps.level_idc >= 31; /* A.3.3.2 */ + pic_param->seq_fields.bits.log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4; + pic_param->seq_fields.bits.pic_order_cnt_type = h->sps.poc_type; + pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4; + pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag; + pic_param->num_slice_groups_minus1 = h->pps.slice_group_count - 1; + pic_param->slice_group_map_type = h->pps.mb_slice_group_map_type; + pic_param->slice_group_change_rate_minus1 = 0; /* XXX: unimplemented in FFmpeg */ + pic_param->pic_init_qp_minus26 = h->pps.init_qp - 26; + pic_param->pic_init_qs_minus26 = h->pps.init_qs - 26; + pic_param->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0]; + pic_param->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1]; + pic_param->pic_fields.value = 0; /* reset all bits */ + pic_param->pic_fields.bits.entropy_coding_mode_flag = h->pps.cabac; + pic_param->pic_fields.bits.weighted_pred_flag = h->pps.weighted_pred; + pic_param->pic_fields.bits.weighted_bipred_idc = h->pps.weighted_bipred_idc; + pic_param->pic_fields.bits.transform_8x8_mode_flag = h->pps.transform_8x8_mode; + pic_param->pic_fields.bits.field_pic_flag = s->picture_structure != PICT_FRAME; + pic_param->pic_fields.bits.constrained_intra_pred_flag = h->pps.constrained_intra_pred; + pic_param->pic_fields.bits.pic_order_present_flag = h->pps.pic_order_present; + pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present; + pic_param->pic_fields.bits.redundant_pic_cnt_present_flag = h->pps.redundant_pic_cnt_present; + pic_param->pic_fields.bits.reference_pic_flag = h->nal_ref_idc != 0; + pic_param->frame_num = h->frame_num; + + /* Fill in VAIQMatrixBufferH264. */ + iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264)); + if (!iq_matrix) + return -1; + memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4)); + memcpy(iq_matrix->ScalingList8x8, h->pps.scaling_matrix8, sizeof(iq_matrix->ScalingList8x8)); + return 0; +} + +/** Ends a hardware decoding based frame. */ +static int end_frame(AVCodecContext *avctx) +{ + H264Context * const h = avctx->priv_data; + + dprintf(avctx, "end_frame()\n"); + return ff_vaapi_common_end_frame(&h->s); +} + +/** Decodes the given H.264 slice with VA API. */ +static int decode_slice(AVCodecContext *avctx, + const uint8_t *buffer, + uint32_t size) +{ + H264Context * const h = avctx->priv_data; + MpegEncContext * const s = &h->s; + VASliceParameterBufferH264 *slice_param; + + dprintf(avctx, "decode_slice(): buffer %p, size %d\n", buffer, size); + + /* Fill in VASliceParameterBufferH264. */ + slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size); + if (!slice_param) + return -1; + slice_param->slice_data_bit_offset = get_bits_count(&h->s.gb) + 8; /* bit buffer started beyond nal_unit_type */ + slice_param->first_mb_in_slice = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x; + slice_param->slice_type = get_slice_type(h); + slice_param->direct_spatial_mv_pred_flag = h->slice_type == FF_B_TYPE ? h->direct_spatial_mv_pred : 0; + slice_param->num_ref_idx_l0_active_minus1 = h->list_count > 0 ? h->ref_count[0] - 1 : 0; + slice_param->num_ref_idx_l1_active_minus1 = h->list_count > 1 ? h->ref_count[1] - 1 : 0; + slice_param->cabac_init_idc = h->cabac_init_idc; + slice_param->slice_qp_delta = s->qscale - h->pps.init_qp; + slice_param->disable_deblocking_filter_idc = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter; + slice_param->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2; + slice_param->slice_beta_offset_div2 = h->slice_beta_offset / 2; + slice_param->luma_log2_weight_denom = h->luma_log2_weight_denom; + slice_param->chroma_log2_weight_denom = h->chroma_log2_weight_denom; + + fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0); + fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->ref_count[1] : 0); + + fill_vaapi_plain_pred_weight_table(h, 0, + &slice_param->luma_weight_l0_flag, slice_param->luma_weight_l0, slice_param->luma_offset_l0, + &slice_param->chroma_weight_l0_flag, slice_param->chroma_weight_l0, slice_param->chroma_offset_l0); + fill_vaapi_plain_pred_weight_table(h, 1, + &slice_param->luma_weight_l1_flag, slice_param->luma_weight_l1, slice_param->luma_offset_l1, + &slice_param->chroma_weight_l1_flag, slice_param->chroma_weight_l1, slice_param->chroma_offset_l1); + return 0; +} + +AVHWAccel h264_vaapi_hwaccel = { + .name = "h264_vaapi", + .type = CODEC_TYPE_VIDEO, + .id = CODEC_ID_H264, + .pix_fmt = PIX_FMT_VAAPI_VLD, + .capabilities = 0, + .start_frame = start_frame, + .end_frame = end_frame, + .decode_slice = decode_slice, + .priv_data_size = 0, +}; 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