Add MPEG-4 / H.263 bitstream decoding through VA API.

Originally committed as revision 18307 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 175 insertions, 0 deletions

diff --git a/libavcodec/vaapi_mpeg4.c b/libavcodec/vaapi_mpeg4.c
new file mode 100644
index 0000000000..ab9355f354
--- /dev/null
+++ b/libavcodec/vaapi_mpeg4.c
@@ -0,0 +1,175 @@
+/*
+ * MPEG-4 / H.263 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"
+
+/** Reconstruct bitstream intra_dc_vlc_thr */
+static int mpeg4_get_intra_dc_vlc_thr(MpegEncContext *s)
+{
+    switch (s->intra_dc_threshold) {
+    case 99: return 0;
+    case 13: return 1;
+    case 15: return 2;
+    case 17: return 3;
+    case 19: return 4;
+    case 21: return 5;
+    case 23: return 6;
+    case 0:  return 7;
+    }
+    return 0;
+}
+
+static int vaapi_mpeg4_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
+{
+    MpegEncContext * const s = avctx->priv_data;
+    struct vaapi_context * const vactx = avctx->hwaccel_context;
+    VAPictureParameterBufferMPEG4 *pic_param;
+    VAIQMatrixBufferMPEG4 *iq_matrix;
+    int i;
+
+    dprintf(avctx, "vaapi_mpeg4_start_frame()\n");
+
+    vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG4);
+
+    /* Fill in VAPictureParameterBufferMPEG4 */
+    pic_param = ff_vaapi_alloc_picture(vactx, sizeof(VAPictureParameterBufferMPEG4));
+    if (!pic_param)
+        return -1;
+    pic_param->vop_width                                = s->width;
+    pic_param->vop_height                               = s->height;
+    pic_param->forward_reference_picture                = 0xffffffff;
+    pic_param->backward_reference_picture               = 0xffffffff;
+    pic_param->vol_fields.value                         = 0; /* reset all bits */
+    pic_param->vol_fields.bits.short_video_header       = avctx->codec->id == CODEC_ID_H263;
+    pic_param->vol_fields.bits.chroma_format            = CHROMA_420;
+    pic_param->vol_fields.bits.interlaced               = !s->progressive_sequence;
+    pic_param->vol_fields.bits.obmc_disable             = 1;
+    pic_param->vol_fields.bits.sprite_enable            = s->vol_sprite_usage;
+    pic_param->vol_fields.bits.sprite_warping_accuracy  = s->sprite_warping_accuracy;
+    pic_param->vol_fields.bits.quant_type               = s->mpeg_quant;
+    pic_param->vol_fields.bits.quarter_sample           = s->quarter_sample;
+    pic_param->vol_fields.bits.data_partitioned         = s->data_partitioning;
+    pic_param->vol_fields.bits.reversible_vlc           = s->rvlc;
+    pic_param->no_of_sprite_warping_points              = s->num_sprite_warping_points;
+    for (i = 0; i < s->num_sprite_warping_points && i < 3; i++) {
+        pic_param->sprite_trajectory_du[i]              = s->sprite_traj[i][0];
+        pic_param->sprite_trajectory_dv[i]              = s->sprite_traj[i][1];
+    }
+    pic_param->quant_precision                          = s->quant_precision;
+    pic_param->vop_fields.value                         = 0; /* reset all bits */
+    pic_param->vop_fields.bits.vop_coding_type          = s->pict_type - FF_I_TYPE;
+    pic_param->vop_fields.bits.backward_reference_vop_coding_type = s->pict_type == FF_B_TYPE ? s->next_picture.pict_type - FF_I_TYPE : 0;
+    pic_param->vop_fields.bits.vop_rounding_type        = s->no_rounding;
+    pic_param->vop_fields.bits.intra_dc_vlc_thr         = mpeg4_get_intra_dc_vlc_thr(s);
+    pic_param->vop_fields.bits.top_field_first          = s->top_field_first;
+    pic_param->vop_fields.bits.alternate_vertical_scan_flag = s->alternate_scan;
+    pic_param->vop_fcode_forward                        = s->f_code;
+    pic_param->vop_fcode_backward                       = s->b_code;
+    pic_param->num_macroblocks_in_gob                   = s->mb_width * ff_h263_get_gob_height(s);
+    pic_param->num_gobs_in_vop                          = (s->mb_width * s->mb_height) / pic_param->num_macroblocks_in_gob;
+    pic_param->TRB                                      = s->pb_time;
+    pic_param->TRD                                      = s->pp_time;
+
+    if (s->pict_type == FF_B_TYPE)
+        pic_param->backward_reference_picture = ff_vaapi_get_surface(&s->next_picture);
+    if (s->pict_type != FF_I_TYPE)
+        pic_param->forward_reference_picture  = ff_vaapi_get_surface(&s->last_picture);
+
+    /* Fill in VAIQMatrixBufferMPEG4 */
+    /* Only the first inverse quantisation method uses the weighthing matrices */
+    if (pic_param->vol_fields.bits.quant_type) {
+        iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG4));
+        if (!iq_matrix)
+            return -1;
+        iq_matrix->load_intra_quant_mat         = 1;
+        iq_matrix->load_non_intra_quant_mat     = 1;
+
+        for (i = 0; i < 64; i++) {
+            int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
+            iq_matrix->intra_quant_mat[i]       = s->intra_matrix[n];
+            iq_matrix->non_intra_quant_mat[i]   = s->inter_matrix[n];
+        }
+    }
+    return 0;
+}
+
+static int vaapi_mpeg4_end_frame(AVCodecContext *avctx)
+{
+    return ff_vaapi_common_end_frame(avctx->priv_data);
+}
+
+static int vaapi_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
+{
+    MpegEncContext * const s = avctx->priv_data;
+    VASliceParameterBufferMPEG4 *slice_param;
+
+    dprintf(avctx, "vaapi_mpeg4_decode_slice(): buffer %p, size %d\n", buffer, size);
+
+    /* video_plane_with_short_video_header() contains all GOBs
+     * in-order, and this is what VA API (Intel backend) expects: only
+     * a single slice param. So fake macroblock_number for FFmpeg so
+     * that we don't call vaapi_mpeg4_decode_slice() again
+     */
+    if (avctx->codec->id == CODEC_ID_H263)
+        size = s->gb.buffer_end - buffer;
+
+    /* Fill in VASliceParameterBufferMPEG4 */
+    slice_param = (VASliceParameterBufferMPEG4 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
+    if (!slice_param)
+        return -1;
+    slice_param->macroblock_offset      = get_bits_count(&s->gb) % 8;
+    slice_param->macroblock_number      = s->mb_y * s->mb_width + s->mb_x;
+    slice_param->quant_scale            = s->qscale;
+
+    if (avctx->codec->id == CODEC_ID_H263)
+        s->mb_y = s->mb_height;
+
+    return 0;
+}
+
+#if CONFIG_MPEG4_VAAPI_HWACCEL
+AVHWAccel mpeg4_vaapi_hwaccel = {
+    .name           = "mpeg4_vaapi",
+    .type           = CODEC_TYPE_VIDEO,
+    .id             = CODEC_ID_MPEG4,
+    .pix_fmt        = PIX_FMT_VAAPI_VLD,
+    .capabilities   = 0,
+    .start_frame    = vaapi_mpeg4_start_frame,
+    .end_frame      = vaapi_mpeg4_end_frame,
+    .decode_slice   = vaapi_mpeg4_decode_slice,
+    .priv_data_size = 0,
+};
+#endif
+
+#if CONFIG_H263_VAAPI_HWACCEL
+AVHWAccel h263_vaapi_hwaccel = {
+    .name           = "h263_vaapi",
+    .type           = CODEC_TYPE_VIDEO,
+    .id             = CODEC_ID_H263,
+    .pix_fmt        = PIX_FMT_VAAPI_VLD,
+    .capabilities   = 0,
+    .start_frame    = vaapi_mpeg4_start_frame,
+    .end_frame      = vaapi_mpeg4_end_frame,
+    .decode_slice   = vaapi_mpeg4_decode_slice,
+    .priv_data_size = 0,
+};
+#endif