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third_party_ffmpeg/libavcodec/mpegvideo_xvmc.c
Diego Biurrun 19e30a58fc Deprecate obsolete XvMC hardware decoding support 
XvMC has long ago been superseded by newer acceleration APIs, such as
VDPAU, and few downstreams still support it. Furthermore XvMC is not
implemented within the hwaccel framework, but requires its own specific
code in the MPEG-1/2 decoder, which is a maintenance burden.
2013-11-13 21:07:45 +01:00

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/*
* XVideo Motion Compensation
* Copyright (c) 2003 Ivan Kalvachev
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <limits.h>
#include <X11/extensions/XvMC.h>
#include "avcodec.h"
#include "mpegvideo.h"
#undef NDEBUG
#include <assert.h>
#include "xvmc.h"
#include "xvmc_internal.h"
#include "version.h"
#if FF_API_XVMC
/**
* Initialize the block field of the MpegEncContext pointer passed as
* parameter after making sure that the data is not corrupted.
* In order to implement something like direct rendering instead of decoding
* coefficients in s->blocks and then copying them, copy them directly
* into the data_blocks array provided by xvmc.
*/
void ff_xvmc_init_block(MpegEncContext *s)
{
struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
assert(render && render->xvmc_id == AV_XVMC_ID);
s->block = (int16_t (*)[64])(render->data_blocks + render->next_free_data_block_num * 64);
}
/**
* Fill individual block pointers, so there are no gaps in the data_block array
* in case not all blocks in the macroblock are coded.
*/
void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
{
int i, j = 0;
const int mb_block_count = 4 + (1 << s->chroma_format);
cbp <<= 12-mb_block_count;
for (i = 0; i < mb_block_count; i++) {
if (cbp & (1 << 11))
s->pblocks[i] = &s->block[j++];
else
s->pblocks[i] = NULL;
cbp += cbp;
}
}
/**
* Find and store the surfaces that are used as reference frames.
* This function should be called for every new field and/or frame.
* It should be safe to call the function a few times for the same field.
*/
int ff_xvmc_field_start(MpegEncContext *s, AVCodecContext *avctx)
{
struct xvmc_pix_fmt *last, *next, *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
const int mb_block_count = 4 + (1 << s->chroma_format);
assert(avctx);
if (!render || render->xvmc_id != AV_XVMC_ID ||
!render->data_blocks || !render->mv_blocks ||
(unsigned int)render->allocated_mv_blocks > INT_MAX/(64*6) ||
(unsigned int)render->allocated_data_blocks > INT_MAX/64 ||
!render->p_surface) {
av_log(avctx, AV_LOG_ERROR,
"Render token doesn't look as expected.\n");
return -1; // make sure that this is a render packet
}
if (render->filled_mv_blocks_num) {
av_log(avctx, AV_LOG_ERROR,
"Rendering surface contains %i unprocessed blocks.\n",
render->filled_mv_blocks_num);
return -1;
}
if (render->allocated_mv_blocks < 1 ||
render->allocated_data_blocks < render->allocated_mv_blocks*mb_block_count ||
render->start_mv_blocks_num >= render->allocated_mv_blocks ||
render->next_free_data_block_num >
render->allocated_data_blocks -
mb_block_count*(render->allocated_mv_blocks-render->start_mv_blocks_num)) {
av_log(avctx, AV_LOG_ERROR,
"Rendering surface doesn't provide enough block structures to work with.\n");
return -1;
}
render->picture_structure = s->picture_structure;
render->flags = s->first_field ? 0 : XVMC_SECOND_FIELD;
render->p_future_surface = NULL;
render->p_past_surface = NULL;
switch(s->pict_type) {
case AV_PICTURE_TYPE_I:
return 0; // no prediction from other frames
case AV_PICTURE_TYPE_B:
next = (struct xvmc_pix_fmt*)s->next_picture.f.data[2];
if (!next)
return -1;
if (next->xvmc_id != AV_XVMC_ID)
return -1;
render->p_future_surface = next->p_surface;
// no return here, going to set forward prediction
case AV_PICTURE_TYPE_P:
last = (struct xvmc_pix_fmt*)s->last_picture.f.data[2];
if (!last)
last = render; // predict second field from the first
if (last->xvmc_id != AV_XVMC_ID)
return -1;
render->p_past_surface = last->p_surface;
return 0;
}
return -1;
}
/**
* Complete frame/field rendering by passing any remaining blocks.
* Normally ff_draw_horiz_band() is called for each slice, however,
* some leftover blocks, for example from error_resilience(), may remain.
* It should be safe to call the function a few times for the same field.
*/
void ff_xvmc_field_end(MpegEncContext *s)
{
struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
assert(render);
if (render->filled_mv_blocks_num > 0)
ff_mpeg_draw_horiz_band(s, 0, 0);
}
/**
* Synthesize the data needed by XvMC to render one macroblock of data.
* Fill all relevant fields, if necessary do IDCT.
*/
void ff_xvmc_decode_mb(MpegEncContext *s)
{
XvMCMacroBlock *mv_block;
struct xvmc_pix_fmt *render;
int i, cbp, blocks_per_mb;
const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
if (s->encoding) {
av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
return;
}
// from MPV_decode_mb(), update DC predictors for P macroblocks
if (!s->mb_intra) {
s->last_dc[0] =
s->last_dc[1] =
s->last_dc[2] = 128 << s->intra_dc_precision;
}
// MC doesn't skip blocks
s->mb_skipped = 0;
// Do I need to export quant when I could not perform postprocessing?
// Anyway, it doesn't hurt.
s->current_picture.qscale_table[mb_xy] = s->qscale;
// start of XVMC-specific code
render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
assert(render);
assert(render->xvmc_id == AV_XVMC_ID);
assert(render->mv_blocks);
// take the next free macroblock
mv_block = &render->mv_blocks[render->start_mv_blocks_num +
render->filled_mv_blocks_num];
mv_block->x = s->mb_x;
mv_block->y = s->mb_y;
mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
if (s->mb_intra) {
mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
} else {
mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
if (s->mv_dir & MV_DIR_FORWARD) {
mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
// PMV[n][dir][xy] = mv[dir][n][xy]
mv_block->PMV[0][0][0] = s->mv[0][0][0];
mv_block->PMV[0][0][1] = s->mv[0][0][1];
mv_block->PMV[1][0][0] = s->mv[0][1][0];
mv_block->PMV[1][0][1] = s->mv[0][1][1];
}
if (s->mv_dir & MV_DIR_BACKWARD) {
mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
mv_block->PMV[0][1][0] = s->mv[1][0][0];
mv_block->PMV[0][1][1] = s->mv[1][0][1];
mv_block->PMV[1][1][0] = s->mv[1][1][0];
mv_block->PMV[1][1][1] = s->mv[1][1][1];
}
switch(s->mv_type) {
case MV_TYPE_16X16:
mv_block->motion_type = XVMC_PREDICTION_FRAME;
break;
case MV_TYPE_16X8:
mv_block->motion_type = XVMC_PREDICTION_16x8;
break;
case MV_TYPE_FIELD:
mv_block->motion_type = XVMC_PREDICTION_FIELD;
if (s->picture_structure == PICT_FRAME) {
mv_block->PMV[0][0][1] <<= 1;
mv_block->PMV[1][0][1] <<= 1;
mv_block->PMV[0][1][1] <<= 1;
mv_block->PMV[1][1][1] <<= 1;
}
break;
case MV_TYPE_DMV:
mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
if (s->picture_structure == PICT_FRAME) {
mv_block->PMV[0][0][0] = s->mv[0][0][0]; // top from top
mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
mv_block->PMV[0][1][0] = s->mv[0][0][0]; // bottom from bottom
mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
mv_block->PMV[1][0][0] = s->mv[0][2][0]; // dmv00, top from bottom
mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
mv_block->PMV[1][1][0] = s->mv[0][3][0]; // dmv10, bottom from top
mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
} else {
mv_block->PMV[0][1][0] = s->mv[0][2][0]; // dmv00
mv_block->PMV[0][1][1] = s->mv[0][2][1]; // dmv01
}
break;
default:
assert(0);
}
mv_block->motion_vertical_field_select = 0;
// set correct field references
if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
mv_block->motion_vertical_field_select |= s->field_select[0][0];
mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
}
} // !intra
// time to handle data blocks
mv_block->index = render->next_free_data_block_num;
blocks_per_mb = 6;
if (s->chroma_format >= 2) {
blocks_per_mb = 4 + (1 << s->chroma_format);
}
// calculate cbp
cbp = 0;
for (i = 0; i < blocks_per_mb; i++) {
cbp += cbp;
if (s->block_last_index[i] >= 0)
cbp++;
}
if (s->flags & CODEC_FLAG_GRAY) {
if (s->mb_intra) { // intra frames are always full chroma blocks
for (i = 4; i < blocks_per_mb; i++) {
memset(s->pblocks[i], 0, sizeof(*s->pblocks[i])); // so we need to clear them
if (!render->unsigned_intra)
*s->pblocks[i][0] = 1 << 10;
}
} else {
cbp &= 0xf << (blocks_per_mb - 4);
blocks_per_mb = 4; // luminance blocks only
}
}
mv_block->coded_block_pattern = cbp;
if (cbp == 0)
mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
for (i = 0; i < blocks_per_mb; i++) {
if (s->block_last_index[i] >= 0) {
// I do not have unsigned_intra MOCO to test, hope it is OK.
if (s->mb_intra && (render->idct || !render->unsigned_intra))
*s->pblocks[i][0] -= 1 << 10;
if (!render->idct) {
s->dsp.idct(*s->pblocks[i]);
/* It is unclear if MC hardware requires pixel diff values to be
* in the range [-255;255]. TODO: Clipping if such hardware is
* ever found. As of now it would only be an unnecessary
* slowdown. */
}
// copy blocks only if the codec doesn't support pblocks reordering
if (s->avctx->xvmc_acceleration == 1) {
memcpy(&render->data_blocks[render->next_free_data_block_num*64],
s->pblocks[i], sizeof(*s->pblocks[i]));
}
render->next_free_data_block_num++;
}
}
render->filled_mv_blocks_num++;
assert(render->filled_mv_blocks_num <= render->allocated_mv_blocks);
assert(render->next_free_data_block_num <= render->allocated_data_blocks);
/* The above conditions should not be able to fail as long as this function
* is used and the following 'if ()' automatically calls a callback to free
* blocks. */
if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
ff_mpeg_draw_horiz_band(s, 0, 0);
}
#endif /* FF_API_XVMC */
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