* XVideo Motion Compensation
* Copyright (c) 2003 Ivan Kalvachev
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * 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>
-//avcodec include
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#undef NDEBUG
#include <assert.h>
-//X11 includes are in libavcodec/xvmc.h
-//by replacing it with non-X one
-//XvMC emulation could be performed
-
#include "xvmc.h"
-
-//set s->block
+#include "xvmc_internal.h"
+
+/**
+ * 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_render_state * render;
- render = (struct xvmc_render_state*)s->current_picture.data[2];
- assert(render);
- if (!render || (render->magic != AV_XVMC_RENDER_MAGIC)) {
- assert(0);
- return;//make sure that this is a render packet
- }
- s->block = (DCTELEM *)(render->data_blocks+(render->next_free_data_block_num)*64);
+ 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 = (DCTELEM (*)[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;
+ int i, j = 0;
const int mb_block_count = 4 + (1 << s->chroma_format);
- j = 0;
cbp <<= 12-mb_block_count;
for (i = 0; i < mb_block_count; i++) {
- if (cbp & (1<<11)) {
- s->pblocks[i] = (short *)(&s->block[j++]);
- }else{
+ if (cbp & (1 << 11))
+ s->pblocks[i] = &s->block[j++];
+ else
s->pblocks[i] = NULL;
- }
- cbp+=cbp;
+ cbp += cbp;
}
}
-//These functions should be called on every new field and/or frame.
-//They should be safe if they are called a few times for the same field!
-int ff_xvmc_field_start(MpegEncContext*s, AVCodecContext *avctx)
+/**
+ * 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_render_state * render, * last, * next;
+ 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
+ }
- render = (struct xvmc_render_state*)s->current_picture.data[2];
- assert(render);
- if (!render || (render->magic != AV_XVMC_RENDER_MAGIC))
- return -1;//make sure that this is 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;
-
-//make sure that all data is drawn by XVMC_end_frame
- assert(render->filled_mv_blocks_num == 0);
-
- render->p_future_surface = NULL;
- render->p_past_surface = NULL;
-
- switch(s->pict_type){
- case FF_I_TYPE:
- return 0;// no prediction from other frames
- case FF_B_TYPE:
- next = (struct xvmc_render_state*)s->next_picture.data[2];
- assert(next);
+ 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->magic != AV_XVMC_RENDER_MAGIC)
+ 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 FF_P_TYPE:
- last = (struct xvmc_render_state*)s->last_picture.data[2];
- if (!last)// && !s->first_field)
- last = render;//predict second field from the first
- if (last->magic != AV_XVMC_RENDER_MAGIC)
+ // 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_render_state * render;
- render = (struct xvmc_render_state*)s->current_picture.data[2];
+ 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_draw_horiz_band(s,0,0);
+ ff_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_render_state * render;
- int i,cbp,blocks_per_mb;
+ 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;
return;
}
- //from MPV_decode_mb(),
- /* update DC predictors for P macroblocks */
+ // 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
+ // 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;
+ // Do I need to export quant when I could not perform postprocessing?
+ // Anyway, it doesn't hurt.
+ s->current_picture.f.qscale_table[mb_xy] = s->qscale;
-//START OF XVMC specific code
- render = (struct xvmc_render_state*)s->current_picture.data[2];
+ // start of XVMC-specific code
+ render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
assert(render);
- assert(render->magic==AV_XVMC_RENDER_MAGIC);
+ assert(render->xvmc_id == AV_XVMC_ID);
assert(render->mv_blocks);
- //take the next free macroblock
+ // take the next free macroblock
mv_block = &render->mv_blocks[render->start_mv_blocks_num +
- render->filled_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->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]
+ // 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][1][1] = s->mv[1][1][1];
}
- switch(s->mv_type){
+ switch(s->mv_type) {
case MV_TYPE_16X16:
mv_block->motion_type = XVMC_PREDICTION_FRAME;
break;
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][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[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][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
+ 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
+ } 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:
mv_block->motion_vertical_field_select = 0;
-//set correct field references
+ // set correct field references
if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
- if (s->field_select[0][0])
- mv_block->motion_vertical_field_select |= 1;
- if (s->field_select[1][0])
- mv_block->motion_vertical_field_select |= 2;
- if (s->field_select[0][1])
- mv_block->motion_vertical_field_select |= 4;
- if (s->field_select[1][1])
- mv_block->motion_vertical_field_select |= 8;
+ 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;
+ } // !intra
+ // time to handle data blocks
mv_block->index = render->next_free_data_block_num;
blocks_per_mb = 6;
blocks_per_mb = 4 + (1 << s->chroma_format);
}
-// calculate cbp
+ // calculate cbp
cbp = 0;
for (i = 0; i < blocks_per_mb; i++) {
cbp += cbp;
}
if (s->flags & CODEC_FLAG_GRAY) {
- if (s->mb_intra){//intra frames are always full chroma block
+ 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(short)*8*8);//so we need to clear them
+ 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;
+ *s->pblocks[i][0] = 1 << 10;
}
- }else{
+ } else {
cbp &= 0xf << (blocks_per_mb - 4);
- blocks_per_mb = 4;//luminance blocks only
+ blocks_per_mb = 4; // luminance blocks only
}
}
mv_block->coded_block_pattern = cbp;
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->idct && !render->unsigned_intra)))
- s->pblocks[i][0] -= 1 << 10;
+ if (s->mb_intra && (render->idct || !render->unsigned_intra))
+ *s->pblocks[i][0] -= 1 << 10;
if (!render->idct) {
- s->dsp.idct(s->pblocks[i]);
- //!!TODO!clip!!!
+ 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
+ // 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(short)*8*8);
+ 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->total_number_of_mv_blocks);
- assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
+ 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->total_number_of_mv_blocks)
- ff_draw_horiz_band(s,0,0);
+ if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
+ ff_draw_horiz_band(s, 0, 0);
}
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