Add MPEG-2 bitstream decoding through VA API.

Originally committed as revision 18172 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 149 insertions, 0 deletions

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,
+};