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/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <stdio.h>
#include <assert.h>
#include "vp8_mem.h"
#include "vp8_decoder.h"
#include "alloccommon.h"
#include "dequantize_common.h"
#include "detokenize.h"
static int get_free_fb(VP8_COMMON *common)
{
int i;
for (i = 0; i < NUM_YV12_BUFFERS; i++)
if (common->fb_idx_ref_cnt[i] == 0)
break;
assert(i < NUM_YV12_BUFFERS);
common->fb_idx_ref_cnt[i] = 1;
return i;
}
static void ref_cnt_fb(int *buf, int *idx, int new_idx)
{
if (buf[*idx] > 0)
buf[*idx]--;
*idx = new_idx;
buf[new_idx]++;
}
/**
* If any buffer copy / swapping is signalled it should be done here.
*/
static int swap_frame_buffers(VP8_COMMON *common)
{
int err = 0;
/* The alternate reference frame or golden frame can be updated using the
* new, last, or golden/alt ref frame. If it is updated using the newly
* decoded frame it is a refresh. An update using the last or golden/alt
* ref frame is a copy. */
if (common->copy_buffer_to_alternate)
{
int new_fb = 0;
if (common->copy_buffer_to_alternate == 1)
new_fb = common->lst_fb_idx;
else if (common->copy_buffer_to_alternate == 2)
new_fb = common->gld_fb_idx;
else
err = -1;
ref_cnt_fb(common->fb_idx_ref_cnt, &common->alt_fb_idx, new_fb);
}
if (common->copy_buffer_to_golden)
{
int new_fb = 0;
if (common->copy_buffer_to_golden == 1)
new_fb = common->lst_fb_idx;
else if (common->copy_buffer_to_golden == 2)
new_fb = common->alt_fb_idx;
else
err = -1;
ref_cnt_fb(common->fb_idx_ref_cnt, &common->gld_fb_idx, new_fb);
}
if (common->refresh_golden_frame)
ref_cnt_fb(common->fb_idx_ref_cnt, &common->gld_fb_idx, common->new_fb_idx);
if (common->refresh_alternate_frame)
ref_cnt_fb(common->fb_idx_ref_cnt, &common->alt_fb_idx, common->new_fb_idx);
if (common->refresh_last_frame)
{
ref_cnt_fb(common->fb_idx_ref_cnt, &common->lst_fb_idx, common->new_fb_idx);
common->frame_to_show = &common->yv12_fb[common->lst_fb_idx];
}
else
common->frame_to_show = &common->yv12_fb[common->new_fb_idx];
common->fb_idx_ref_cnt[common->new_fb_idx]--;
return err;
}
/**
* Create a VP8 decoder instance.
*/
VP8_COMMON *vp8_decoder_create()
{
VP8_COMMON *common = vpx_memalign(32, sizeof(VP8_COMMON));
if (!common)
return NULL;
memset(common, 0, sizeof(VP8_COMMON));
if (setjmp(common->error.jmp))
{
common->error.setjmp = 0;
vp8_decoder_remove(common);
return 0;
}
common->error.setjmp = 1;
common->show_frame = 0;
vp8_initialize_common(common);
vp8_initialize_dequantizer(common);
//vp8_initialize_loopfilter(common);
common->error.setjmp = 0;
return common;
}
/**
* Decode one VP8 frame.
*/
int vp8_decoder_start(VP8_COMMON *common,
struct pipe_vp8_picture_desc *frame_header,
const unsigned char *data, unsigned data_size)
{
int retcode = 0;
int bitstreambuffer_offset = 0;
if (frame_header->key_frame == 0)
bitstreambuffer_offset = 10;
else
bitstreambuffer_offset = 3;
common->data = data + bitstreambuffer_offset;
common->data_size = data_size - bitstreambuffer_offset;
common->new_fb_idx = get_free_fb(common);
common->error.error_code = VPX_CODEC_OK;
if (setjmp(common->error.jmp))
{
common->error.setjmp = 0;
/* We do not know if the missing frame(s) was supposed to update
* any of the reference buffers, but we act conservative and
* mark only the last buffer as corrupted. */
common->yv12_fb[common->lst_fb_idx].corrupted = 1;
if (common->fb_idx_ref_cnt[common->new_fb_idx] > 0)
common->fb_idx_ref_cnt[common->new_fb_idx]--;
return -1;
}
common->error.setjmp = 1;
// Frame decoding
retcode = vp8_frame_decode(common, frame_header);
if (retcode < 0)
{
common->error.error_code = VPX_CODEC_ERROR;
common->error.setjmp = 0;
if (common->fb_idx_ref_cnt[common->new_fb_idx] > 0)
common->fb_idx_ref_cnt[common->new_fb_idx]--;
return retcode;
}
// Software frame buffer handling
{
if (swap_frame_buffers(common))
{
common->error.error_code = VPX_CODEC_ERROR;
common->error.setjmp = 0;
return -1;
}
/*
if (cm->filter_level)
{
// Apply the loop filter if appropriate.
vp8_loop_filter_frame(common, &mb);
}
*/
vp8_yv12_extend_frame_borders(common->frame_to_show);
}
/* from libvpx : vp8_print_modes_and_motion_vectors(cm->mi, cm->mb_rows, cm->mb_cols, current_video_frame); */
common->data_size = 0;
common->error.setjmp = 0;
return retcode;
}
/**
* Return a decoded VP8 frame in a YV12 framebuffer.
*/
int vp8_decoder_get_frame_decoded(VP8_COMMON *common, YV12_BUFFER_CONFIG *sd)
{
int ret = -1;
/* ie no raw frame to show!!! */
if (common->show_frame == 0)
return ret;
if (common->frame_to_show)
{
*sd = *common->frame_to_show;
sd->clrtype = common->color_space;
sd->y_width = common->width;
sd->y_height = common->height;
sd->uv_height = common->height / 2;
ret = 0;
}
return ret;
}
/**
* Destroy a VP8 decoder instance.
*/
void vp8_decoder_remove(VP8_COMMON *common)
{
if (!common)
return;
vp8_dealloc_frame_buffers(common);
vpx_free(common->mbd);
vpx_free(common);
}
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