From 3c32bac89834d904a789c5f2b4380434d0a88644 Mon Sep 17 00:00:00 2001 From: Gwenole Beauchesne Date: Mon, 23 Mar 2009 22:09:13 +0000 Subject: Add MPEG-2 bitstream decoding through VA API. Originally committed as revision 18172 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/vaapi_mpeg2.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 libavcodec/vaapi_mpeg2.c (limited to 'libavcodec/vaapi_mpeg2.c') diff --git a/libavcodec/vaapi_mpeg2.c b/libavcodec/vaapi_mpeg2.c new file mode 100644 index 0000000000..0e12dcccea --- /dev/null +++ b/libavcodec/vaapi_mpeg2.c @@ -0,0 +1,149 @@ +/* + * MPEG-2 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 "dsputil.h" + +/** Reconstruct bitstream f_code */ +static inline int mpeg2_get_f_code(MpegEncContext *s) +{ + return ((s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) | + (s->mpeg_f_code[1][0] << 4) | s->mpeg_f_code[1][1]); +} + +/** Determine frame start: first field for field picture or frame picture */ +static inline int mpeg2_get_is_frame_start(MpegEncContext *s) +{ + return s->first_field || s->picture_structure == PICT_FRAME; +} + +static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size) +{ + struct MpegEncContext * const s = avctx->priv_data; + struct vaapi_context * const vactx = avctx->hwaccel_context; + VAPictureParameterBufferMPEG2 *pic_param; + VAIQMatrixBufferMPEG2 *iq_matrix; + int i; + + dprintf(avctx, "vaapi_mpeg2_start_frame()\n"); + + vactx->pic_param_size = sizeof(VAPictureParameterBufferMPEG2); + vactx->iq_matrix_size = sizeof(VAIQMatrixBufferMPEG2); + vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2); + + /* Fill in VAPictureParameterBufferMPEG2 */ + pic_param = &vactx->pic_param.mpeg2; + pic_param->horizontal_size = s->width; + pic_param->vertical_size = s->height; + pic_param->forward_reference_picture = 0xffffffff; + pic_param->backward_reference_picture = 0xffffffff; + pic_param->picture_coding_type = s->pict_type; + pic_param->f_code = mpeg2_get_f_code(s); + pic_param->picture_coding_extension.value = 0; /* reset all bits */ + pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision; + pic_param->picture_coding_extension.bits.picture_structure = s->picture_structure; + pic_param->picture_coding_extension.bits.top_field_first = s->top_field_first; + pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct; + pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors; + pic_param->picture_coding_extension.bits.q_scale_type = s->q_scale_type; + pic_param->picture_coding_extension.bits.intra_vlc_format = s->intra_vlc_format; + pic_param->picture_coding_extension.bits.alternate_scan = s->alternate_scan; + pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field; + pic_param->picture_coding_extension.bits.progressive_frame = s->progressive_frame; + pic_param->picture_coding_extension.bits.is_first_field = mpeg2_get_is_frame_start(s); + + switch (s->pict_type) { + case FF_B_TYPE: + pic_param->backward_reference_picture = ff_vaapi_get_surface(&s->next_picture); + // fall-through + case FF_P_TYPE: + pic_param->forward_reference_picture = ff_vaapi_get_surface(&s->last_picture); + break; + } + + /* Fill in VAIQMatrixBufferMPEG2 */ + iq_matrix = &vactx->iq_matrix.mpeg2; + iq_matrix->load_intra_quantiser_matrix = 1; + iq_matrix->load_non_intra_quantiser_matrix = 1; + iq_matrix->load_chroma_intra_quantiser_matrix = 1; + iq_matrix->load_chroma_non_intra_quantiser_matrix = 1; + vactx->iq_matrix_present = 1; + + for (i = 0; i < 64; i++) { + int n = s->dsp.idct_permutation[ff_zigzag_direct[i]]; + iq_matrix->intra_quantiser_matrix[i] = s->intra_matrix[n]; + iq_matrix->non_intra_quantiser_matrix[i] = s->inter_matrix[n]; + iq_matrix->chroma_intra_quantiser_matrix[i] = s->chroma_intra_matrix[n]; + iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n]; + } + return 0; +} + +static int vaapi_mpeg2_end_frame(AVCodecContext *avctx) +{ + return ff_vaapi_common_end_frame(avctx->priv_data); +} + +static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size) +{ + MpegEncContext * const s = avctx->priv_data; + VASliceParameterBufferMPEG2 *slice_param; + GetBitContext gb; + uint32_t start_code, quantiser_scale_code, intra_slice_flag, macroblock_offset; + + dprintf(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size); + + /* Determine macroblock_offset */ + init_get_bits(&gb, buffer, 8 * size); + start_code = get_bits(&gb, 32); + assert((start_code & 0xffffff00) == 0x00000100); + quantiser_scale_code = get_bits(&gb, 5); + intra_slice_flag = get_bits1(&gb); + if (intra_slice_flag) { + skip_bits(&gb, 8); + while (get_bits1(&gb) != 0) + skip_bits(&gb, 8); + } + macroblock_offset = get_bits_count(&gb); + + /* Fill in VASliceParameterBufferMPEG2 */ + slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size); + if (!slice_param) + return -1; + slice_param->macroblock_offset = macroblock_offset; + slice_param->slice_vertical_position = s->mb_y; + slice_param->quantiser_scale_code = quantiser_scale_code; + slice_param->intra_slice_flag = intra_slice_flag; + return 0; +} + +AVHWAccel mpeg2_vaapi_hwaccel = { + .name = "mpeg2_vaapi", + .type = CODEC_TYPE_VIDEO, + .id = CODEC_ID_MPEG2VIDEO, + .pix_fmt = PIX_FMT_VAAPI_VLD, + .capabilities = 0, + .start_frame = vaapi_mpeg2_start_frame, + .end_frame = vaapi_mpeg2_end_frame, + .decode_slice = vaapi_mpeg2_decode_slice, + .priv_data_size = 0, +}; 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