ref: 10783d4f3a6188a01f9a993c56ab0013acd97214
dir: /vp9/decoder/vp9_decoder.c/
/*
* 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 <assert.h>
#include <limits.h>
#include <stdio.h>
#include "./vpx_scale_rtcd.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/vpx_timer.h"
#include "vpx_scale/vpx_scale.h"
#include "vp9/common/vp9_alloccommon.h"
#include "vp9/common/vp9_loopfilter.h"
#include "vp9/common/vp9_onyxc_int.h"
#if CONFIG_VP9_POSTPROC
#include "vp9/common/vp9_postproc.h"
#endif
#include "vp9/common/vp9_quant_common.h"
#include "vp9/common/vp9_reconintra.h"
#include "vp9/common/vp9_systemdependent.h"
#include "vp9/decoder/vp9_decodeframe.h"
#include "vp9/decoder/vp9_decoder.h"
#include "vp9/decoder/vp9_detokenize.h"
#include "vp9/decoder/vp9_dthread.h"
static void initialize_dec() {
static int init_done = 0;
if (!init_done) {
vp9_rtcd();
vp9_init_neighbors();
vp9_init_intra_predictors();
init_done = 1;
}
}
VP9Decoder *vp9_decoder_create() {
VP9Decoder *const pbi = vpx_memalign(32, sizeof(*pbi));
VP9_COMMON *const cm = pbi ? &pbi->common : NULL;
if (!cm)
return NULL;
vp9_zero(*pbi);
if (setjmp(cm->error.jmp)) {
cm->error.setjmp = 0;
vp9_decoder_remove(pbi);
return NULL;
}
cm->error.setjmp = 1;
pbi->need_resync = 1;
initialize_dec();
// Initialize the references to not point to any frame buffers.
vpx_memset(&cm->ref_frame_map, -1, sizeof(cm->ref_frame_map));
cm->current_video_frame = 0;
pbi->ready_for_new_data = 1;
cm->bit_depth = VPX_BITS_8;
// vp9_init_dequantizer() is first called here. Add check in
// frame_init_dequantizer() to avoid unnecessary calling of
// vp9_init_dequantizer() for every frame.
vp9_init_dequantizer(cm);
vp9_loop_filter_init(cm);
cm->error.setjmp = 0;
vp9_get_worker_interface()->init(&pbi->lf_worker);
return pbi;
}
void vp9_decoder_remove(VP9Decoder *pbi) {
VP9_COMMON *const cm = &pbi->common;
int i;
vp9_get_worker_interface()->end(&pbi->lf_worker);
vpx_free(pbi->lf_worker.data1);
vpx_free(pbi->tile_data);
for (i = 0; i < pbi->num_tile_workers; ++i) {
VP9Worker *const worker = &pbi->tile_workers[i];
vp9_get_worker_interface()->end(worker);
vpx_free(worker->data1);
vpx_free(worker->data2);
}
vpx_free(pbi->tile_workers);
if (pbi->num_tile_workers > 0) {
vp9_loop_filter_dealloc(&pbi->lf_row_sync);
}
vp9_remove_common(cm);
vpx_free(pbi);
}
static int equal_dimensions(const YV12_BUFFER_CONFIG *a,
const YV12_BUFFER_CONFIG *b) {
return a->y_height == b->y_height && a->y_width == b->y_width &&
a->uv_height == b->uv_height && a->uv_width == b->uv_width;
}
vpx_codec_err_t vp9_copy_reference_dec(VP9Decoder *pbi,
VP9_REFFRAME ref_frame_flag,
YV12_BUFFER_CONFIG *sd) {
VP9_COMMON *cm = &pbi->common;
/* TODO(jkoleszar): The decoder doesn't have any real knowledge of what the
* encoder is using the frame buffers for. This is just a stub to keep the
* vpxenc --test-decode functionality working, and will be replaced in a
* later commit that adds VP9-specific controls for this functionality.
*/
if (ref_frame_flag == VP9_LAST_FLAG) {
const YV12_BUFFER_CONFIG *const cfg = get_ref_frame(cm, 0);
if (cfg == NULL) {
vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
"No 'last' reference frame");
return VPX_CODEC_ERROR;
}
if (!equal_dimensions(cfg, sd))
vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
"Incorrect buffer dimensions");
else
vp8_yv12_copy_frame(cfg, sd);
} else {
vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
"Invalid reference frame");
}
return cm->error.error_code;
}
vpx_codec_err_t vp9_set_reference_dec(VP9_COMMON *cm,
VP9_REFFRAME ref_frame_flag,
YV12_BUFFER_CONFIG *sd) {
RefBuffer *ref_buf = NULL;
// TODO(jkoleszar): The decoder doesn't have any real knowledge of what the
// encoder is using the frame buffers for. This is just a stub to keep the
// vpxenc --test-decode functionality working, and will be replaced in a
// later commit that adds VP9-specific controls for this functionality.
if (ref_frame_flag == VP9_LAST_FLAG) {
ref_buf = &cm->frame_refs[0];
} else if (ref_frame_flag == VP9_GOLD_FLAG) {
ref_buf = &cm->frame_refs[1];
} else if (ref_frame_flag == VP9_ALT_FLAG) {
ref_buf = &cm->frame_refs[2];
} else {
vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
"Invalid reference frame");
return cm->error.error_code;
}
if (!equal_dimensions(ref_buf->buf, sd)) {
vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
"Incorrect buffer dimensions");
} else {
int *ref_fb_ptr = &ref_buf->idx;
// Find an empty frame buffer.
const int free_fb = get_free_fb(cm);
// Decrease ref_count since it will be increased again in
// ref_cnt_fb() below.
cm->frame_bufs[free_fb].ref_count--;
// Manage the reference counters and copy image.
ref_cnt_fb(cm->frame_bufs, ref_fb_ptr, free_fb);
ref_buf->buf = &cm->frame_bufs[*ref_fb_ptr].buf;
vp8_yv12_copy_frame(sd, ref_buf->buf);
}
return cm->error.error_code;
}
/* If any buffer updating is signaled it should be done here. */
static void swap_frame_buffers(VP9Decoder *pbi) {
int ref_index = 0, mask;
VP9_COMMON *const cm = &pbi->common;
for (mask = pbi->refresh_frame_flags; mask; mask >>= 1) {
if (mask & 1) {
const int old_idx = cm->ref_frame_map[ref_index];
ref_cnt_fb(cm->frame_bufs, &cm->ref_frame_map[ref_index],
cm->new_fb_idx);
if (old_idx >= 0 && cm->frame_bufs[old_idx].ref_count == 0)
cm->release_fb_cb(cm->cb_priv,
&cm->frame_bufs[old_idx].raw_frame_buffer);
}
++ref_index;
}
cm->frame_to_show = get_frame_new_buffer(cm);
cm->frame_bufs[cm->new_fb_idx].ref_count--;
// Invalidate these references until the next frame starts.
for (ref_index = 0; ref_index < 3; ref_index++)
cm->frame_refs[ref_index].idx = INT_MAX;
}
int vp9_receive_compressed_data(VP9Decoder *pbi,
size_t size, const uint8_t **psource) {
VP9_COMMON *const cm = &pbi->common;
const uint8_t *source = *psource;
int retcode = 0;
cm->error.error_code = VPX_CODEC_OK;
if (size == 0) {
// This is used to signal that we are missing frames.
// 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.
//
// TODO(jkoleszar): Error concealment is undefined and non-normative
// at this point, but if it becomes so, [0] may not always be the correct
// thing to do here.
if (cm->frame_refs[0].idx != INT_MAX)
cm->frame_refs[0].buf->corrupted = 1;
}
// Check if the previous frame was a frame without any references to it.
if (cm->new_fb_idx >= 0 && cm->frame_bufs[cm->new_fb_idx].ref_count == 0)
cm->release_fb_cb(cm->cb_priv,
&cm->frame_bufs[cm->new_fb_idx].raw_frame_buffer);
cm->new_fb_idx = get_free_fb(cm);
if (setjmp(cm->error.jmp)) {
pbi->need_resync = 1;
cm->error.setjmp = 0;
vp9_clear_system_state();
// 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.
//
// TODO(jkoleszar): Error concealment is undefined and non-normative
// at this point, but if it becomes so, [0] may not always be the correct
// thing to do here.
if (cm->frame_refs[0].idx != INT_MAX && cm->frame_refs[0].buf != NULL)
cm->frame_refs[0].buf->corrupted = 1;
if (cm->new_fb_idx > 0 && cm->frame_bufs[cm->new_fb_idx].ref_count > 0)
cm->frame_bufs[cm->new_fb_idx].ref_count--;
return -1;
}
cm->error.setjmp = 1;
vp9_decode_frame(pbi, source, source + size, psource);
swap_frame_buffers(pbi);
vp9_clear_system_state();
cm->last_width = cm->width;
cm->last_height = cm->height;
if (!cm->show_existing_frame)
cm->last_show_frame = cm->show_frame;
if (cm->show_frame) {
if (!cm->show_existing_frame)
vp9_swap_mi_and_prev_mi(cm);
cm->current_video_frame++;
}
pbi->ready_for_new_data = 0;
cm->error.setjmp = 0;
return retcode;
}
int vp9_get_raw_frame(VP9Decoder *pbi, YV12_BUFFER_CONFIG *sd,
vp9_ppflags_t *flags) {
VP9_COMMON *const cm = &pbi->common;
int ret = -1;
#if !CONFIG_VP9_POSTPROC
(void)*flags;
#endif
if (pbi->ready_for_new_data == 1)
return ret;
/* no raw frame to show!!! */
if (!cm->show_frame)
return ret;
pbi->ready_for_new_data = 1;
#if CONFIG_VP9_POSTPROC
if (!cm->show_existing_frame) {
ret = vp9_post_proc_frame(cm, sd, flags);
} else {
*sd = *cm->frame_to_show;
ret = 0;
}
#else
*sd = *cm->frame_to_show;
ret = 0;
#endif /*!CONFIG_POSTPROC*/
vp9_clear_system_state();
return ret;
}
vpx_codec_err_t vp9_parse_superframe_index(const uint8_t *data,
size_t data_sz,
uint32_t sizes[8], int *count,
vpx_decrypt_cb decrypt_cb,
void *decrypt_state) {
// A chunk ending with a byte matching 0xc0 is an invalid chunk unless
// it is a super frame index. If the last byte of real video compression
// data is 0xc0 the encoder must add a 0 byte. If we have the marker but
// not the associated matching marker byte at the front of the index we have
// an invalid bitstream and need to return an error.
uint8_t marker;
assert(data_sz);
marker = read_marker(decrypt_cb, decrypt_state, data + data_sz - 1);
*count = 0;
if ((marker & 0xe0) == 0xc0) {
const uint32_t frames = (marker & 0x7) + 1;
const uint32_t mag = ((marker >> 3) & 0x3) + 1;
const size_t index_sz = 2 + mag * frames;
// This chunk is marked as having a superframe index but doesn't have
// enough data for it, thus it's an invalid superframe index.
if (data_sz < index_sz)
return VPX_CODEC_CORRUPT_FRAME;
{
const uint8_t marker2 = read_marker(decrypt_cb, decrypt_state,
data + data_sz - index_sz);
// This chunk is marked as having a superframe index but doesn't have
// the matching marker byte at the front of the index therefore it's an
// invalid chunk.
if (marker != marker2)
return VPX_CODEC_CORRUPT_FRAME;
}
{
// Found a valid superframe index.
uint32_t i, j;
const uint8_t *x = &data[data_sz - index_sz + 1];
// Frames has a maximum of 8 and mag has a maximum of 4.
uint8_t clear_buffer[32];
assert(sizeof(clear_buffer) >= frames * mag);
if (decrypt_cb) {
decrypt_cb(decrypt_state, x, clear_buffer, frames * mag);
x = clear_buffer;
}
for (i = 0; i < frames; ++i) {
uint32_t this_sz = 0;
for (j = 0; j < mag; ++j)
this_sz |= (*x++) << (j * 8);
sizes[i] = this_sz;
}
*count = frames;
}
}
return VPX_CODEC_OK;
}