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Unified Diff: third_party/libwebp/dec/vp8.c

Issue 116213006: Update libwebp to 0.4.0 (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: After Blink Roll Created 6 years, 11 months ago
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Index: third_party/libwebp/dec/vp8.c
diff --git a/third_party/libwebp/dec/vp8.c b/third_party/libwebp/dec/vp8.c
index 8632e48e572e5fe6d10c384757c259450550697c..bfd0e8f9d3827ad77469d9ef8137acfadddcd7ab 100644
--- a/third_party/libwebp/dec/vp8.c
+++ b/third_party/libwebp/dec/vp8.c
@@ -13,15 +13,12 @@
#include <stdlib.h>
+#include "./alphai.h"
#include "./vp8i.h"
#include "./vp8li.h"
#include "./webpi.h"
#include "../utils/bit_reader.h"
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
//------------------------------------------------------------------------------
int WebPGetDecoderVersion(void) {
@@ -123,6 +120,9 @@ int VP8GetInfo(const uint8_t* data, size_t data_size, size_t chunk_size,
if (((bits >> 5)) >= chunk_size) { // partition_length
return 0; // inconsistent size information.
}
+ if (w == 0 || h == 0) {
+ return 0; // We don't support both width and height to be zero.
+ }
if (width) {
*width = w;
@@ -249,7 +249,6 @@ int VP8GetHeaders(VP8Decoder* const dec, VP8Io* const io) {
VP8PictureHeader* pic_hdr;
VP8BitReader* br;
VP8StatusCode status;
- WebPHeaderStructure headers;
if (dec == NULL) {
return 0;
@@ -259,33 +258,8 @@ int VP8GetHeaders(VP8Decoder* const dec, VP8Io* const io) {
return VP8SetError(dec, VP8_STATUS_INVALID_PARAM,
"null VP8Io passed to VP8GetHeaders()");
}
-
- // Process Pre-VP8 chunks.
- headers.data = io->data;
- headers.data_size = io->data_size;
- status = WebPParseHeaders(&headers);
- if (status != VP8_STATUS_OK) {
- return VP8SetError(dec, status, "Incorrect/incomplete header.");
- }
- if (headers.is_lossless) {
- return VP8SetError(dec, VP8_STATUS_BITSTREAM_ERROR,
- "Unexpected lossless format encountered.");
- }
-
- if (dec->alpha_data_ == NULL) {
- assert(dec->alpha_data_size_ == 0);
- // We have NOT set alpha data yet. Set it now.
- // (This is to ensure that dec->alpha_data_ is NOT reset to NULL if
- // WebPParseHeaders() is called more than once, as in incremental decoding
- // case.)
- dec->alpha_data_ = headers.alpha_data;
- dec->alpha_data_size_ = headers.alpha_data_size;
- }
-
- // Process the VP8 frame header.
- buf = headers.data + headers.offset;
- buf_size = headers.data_size - headers.offset;
- assert(headers.data_size >= headers.offset); // WebPParseHeaders' guarantee
+ buf = io->data;
+ buf_size = io->data_size;
if (buf_size < 4) {
return VP8SetError(dec, VP8_STATUS_NOT_ENOUGH_DATA,
"Truncated header.");
@@ -381,38 +355,11 @@ int VP8GetHeaders(VP8Decoder* const dec, VP8Io* const io) {
// Frame buffer marking
if (!frm_hdr->key_frame_) {
- // Paragraph 9.7
-#ifndef ONLY_KEYFRAME_CODE
- dec->buffer_flags_ = VP8Get(br) << 0; // update golden
- dec->buffer_flags_ |= VP8Get(br) << 1; // update alt ref
- if (!(dec->buffer_flags_ & 1)) {
- dec->buffer_flags_ |= VP8GetValue(br, 2) << 2;
- }
- if (!(dec->buffer_flags_ & 2)) {
- dec->buffer_flags_ |= VP8GetValue(br, 2) << 4;
- }
- dec->buffer_flags_ |= VP8Get(br) << 6; // sign bias golden
- dec->buffer_flags_ |= VP8Get(br) << 7; // sign bias alt ref
-#else
return VP8SetError(dec, VP8_STATUS_UNSUPPORTED_FEATURE,
"Not a key frame.");
-#endif
- } else {
- dec->buffer_flags_ = 0x003 | 0x100;
}
- // Paragraph 9.8
-#ifndef ONLY_KEYFRAME_CODE
- dec->update_proba_ = VP8Get(br);
- if (!dec->update_proba_) { // save for later restore
- dec->proba_saved_ = dec->proba_;
- }
- dec->buffer_flags_ &= 1 << 8;
- dec->buffer_flags_ |=
- (frm_hdr->key_frame_ || VP8Get(br)) << 8; // refresh last frame
-#else
- VP8Get(br); // just ignore the value of update_proba_
-#endif
+ VP8Get(br); // ignore the value of update_proba_
VP8ParseProba(br, dec);
@@ -461,9 +408,6 @@ static const uint8_t kZigzag[16] = {
0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15
};
-typedef const uint8_t (*ProbaArray)[NUM_CTX][NUM_PROBAS]; // for const-casting
-typedef const uint8_t (*ProbaCtxArray)[NUM_PROBAS];
-
// See section 13-2: http://tools.ietf.org/html/rfc6386#section-13.2
static int GetLargeValue(VP8BitReader* const br, const uint8_t* const p) {
int v;
@@ -497,19 +441,20 @@ static int GetLargeValue(VP8BitReader* const br, const uint8_t* const p) {
}
// Returns the position of the last non-zero coeff plus one
-// (and 0 if there's no coeff at all)
-static int GetCoeffs(VP8BitReader* const br, ProbaArray prob,
+static int GetCoeffs(VP8BitReader* const br, const VP8BandProbas* const prob,
int ctx, const quant_t dq, int n, int16_t* out) {
// n is either 0 or 1 here. kBands[n] is not necessary for extracting '*p'.
- const uint8_t* p = prob[n][ctx];
- if (!VP8GetBit(br, p[0])) { // first EOB is more a 'CBP' bit.
- return 0;
- }
+ const uint8_t* p = prob[n].probas_[ctx];
for (; n < 16; ++n) {
- const ProbaCtxArray p_ctx = prob[kBands[n + 1]];
- if (!VP8GetBit(br, p[1])) {
- p = p_ctx[0];
- } else { // non zero coeff
+ if (!VP8GetBit(br, p[0])) {
+ return n; // previous coeff was last non-zero coeff
+ }
+ while (!VP8GetBit(br, p[1])) { // sequence of zero coeffs
+ p = prob[kBands[++n]].probas_[0];
+ if (n == 16) return 16;
+ }
+ { // non zero coeff
+ const VP8ProbaArray* const p_ctx = &prob[kBands[n + 1]].probas_[0];
int v;
if (!VP8GetBit(br, p[2])) {
v = 1;
@@ -519,115 +464,107 @@ static int GetCoeffs(VP8BitReader* const br, ProbaArray prob,
p = p_ctx[2];
}
out[kZigzag[n]] = VP8GetSigned(br, v) * dq[n > 0];
- if (n < 15 && !VP8GetBit(br, p[0])) { // EOB
- return n + 1;
- }
}
}
return 16;
}
-// Alias-safe way of converting 4bytes to 32bits.
-typedef union {
- uint8_t i8[4];
- uint32_t i32;
-} PackedNz;
-
-// Table to unpack four bits into four bytes
-static const PackedNz kUnpackTab[16] = {
- {{0, 0, 0, 0}}, {{1, 0, 0, 0}}, {{0, 1, 0, 0}}, {{1, 1, 0, 0}},
- {{0, 0, 1, 0}}, {{1, 0, 1, 0}}, {{0, 1, 1, 0}}, {{1, 1, 1, 0}},
- {{0, 0, 0, 1}}, {{1, 0, 0, 1}}, {{0, 1, 0, 1}}, {{1, 1, 0, 1}},
- {{0, 0, 1, 1}}, {{1, 0, 1, 1}}, {{0, 1, 1, 1}}, {{1, 1, 1, 1}} };
-
-// Macro to pack four LSB of four bytes into four bits.
-#if defined(__PPC__) || defined(_M_PPC) || defined(_ARCH_PPC) || \
- defined(__BIG_ENDIAN__)
-#define PACK_CST 0x08040201U
-#else
-#define PACK_CST 0x01020408U
-#endif
-#define PACK(X, S) ((((X).i32 * PACK_CST) & 0xff000000) >> (S))
-
-static void ParseResiduals(VP8Decoder* const dec,
- VP8MB* const mb, VP8BitReader* const token_br) {
- int out_t_nz, out_l_nz, first;
- ProbaArray ac_prob;
- const VP8QuantMatrix* q = &dec->dqm_[dec->segment_];
- int16_t* dst = dec->coeffs_;
+static WEBP_INLINE uint32_t NzCodeBits(uint32_t nz_coeffs, int nz, int dc_nz) {
+ nz_coeffs <<= 2;
+ nz_coeffs |= (nz > 3) ? 3 : (nz > 1) ? 2 : dc_nz;
+ return nz_coeffs;
+}
+
+static int ParseResiduals(VP8Decoder* const dec,
+ VP8MB* const mb, VP8BitReader* const token_br) {
+ VP8BandProbas (* const bands)[NUM_BANDS] = dec->proba_.bands_;
+ const VP8BandProbas* ac_proba;
+ const VP8QuantMatrix* const q = &dec->dqm_[dec->segment_];
+ VP8MBData* const block = dec->mb_data_ + dec->mb_x_;
+ int16_t* dst = block->coeffs_;
VP8MB* const left_mb = dec->mb_info_ - 1;
- PackedNz nz_ac, nz_dc;
- PackedNz tnz, lnz;
- uint32_t non_zero_ac = 0;
- uint32_t non_zero_dc = 0;
+ uint8_t tnz, lnz;
+ uint32_t non_zero_y = 0;
+ uint32_t non_zero_uv = 0;
int x, y, ch;
+ uint32_t out_t_nz, out_l_nz;
+ int first;
- nz_dc.i32 = nz_ac.i32 = 0;
memset(dst, 0, 384 * sizeof(*dst));
- if (!dec->is_i4x4_) { // parse DC
+ if (!block->is_i4x4_) { // parse DC
int16_t dc[16] = { 0 };
- const int ctx = mb->dc_nz_ + left_mb->dc_nz_;
- mb->dc_nz_ = left_mb->dc_nz_ =
- (GetCoeffs(token_br, (ProbaArray)dec->proba_.coeffs_[1],
- ctx, q->y2_mat_, 0, dc) > 0);
+ const int ctx = mb->nz_dc_ + left_mb->nz_dc_;
+ const int nz = GetCoeffs(token_br, bands[1], ctx, q->y2_mat_, 0, dc);
+ mb->nz_dc_ = left_mb->nz_dc_ = (nz > 0);
+ if (nz > 1) { // more than just the DC -> perform the full transform
+ VP8TransformWHT(dc, dst);
+ } else { // only DC is non-zero -> inlined simplified transform
+ int i;
+ const int dc0 = (dc[0] + 3) >> 3;
+ for (i = 0; i < 16 * 16; i += 16) dst[i] = dc0;
+ }
first = 1;
- ac_prob = (ProbaArray)dec->proba_.coeffs_[0];
- VP8TransformWHT(dc, dst);
+ ac_proba = bands[0];
} else {
first = 0;
- ac_prob = (ProbaArray)dec->proba_.coeffs_[3];
+ ac_proba = bands[3];
}
- tnz = kUnpackTab[mb->nz_ & 0xf];
- lnz = kUnpackTab[left_mb->nz_ & 0xf];
+ tnz = mb->nz_ & 0x0f;
+ lnz = left_mb->nz_ & 0x0f;
for (y = 0; y < 4; ++y) {
- int l = lnz.i8[y];
+ int l = lnz & 1;
+ uint32_t nz_coeffs = 0;
for (x = 0; x < 4; ++x) {
- const int ctx = l + tnz.i8[x];
- const int nz = GetCoeffs(token_br, ac_prob, ctx,
- q->y1_mat_, first, dst);
- tnz.i8[x] = l = (nz > 0);
- nz_dc.i8[x] = (dst[0] != 0);
- nz_ac.i8[x] = (nz > 1);
+ const int ctx = l + (tnz & 1);
+ const int nz = GetCoeffs(token_br, ac_proba, ctx, q->y1_mat_, first, dst);
+ l = (nz > first);
+ tnz = (tnz >> 1) | (l << 7);
+ nz_coeffs = NzCodeBits(nz_coeffs, nz, dst[0] != 0);
dst += 16;
}
- lnz.i8[y] = l;
- non_zero_dc |= PACK(nz_dc, 24 - y * 4);
- non_zero_ac |= PACK(nz_ac, 24 - y * 4);
+ tnz >>= 4;
+ lnz = (lnz >> 1) | (l << 7);
+ non_zero_y = (non_zero_y << 8) | nz_coeffs;
}
- out_t_nz = PACK(tnz, 24);
- out_l_nz = PACK(lnz, 24);
+ out_t_nz = tnz;
+ out_l_nz = lnz >> 4;
- tnz = kUnpackTab[mb->nz_ >> 4];
- lnz = kUnpackTab[left_mb->nz_ >> 4];
for (ch = 0; ch < 4; ch += 2) {
+ uint32_t nz_coeffs = 0;
+ tnz = mb->nz_ >> (4 + ch);
+ lnz = left_mb->nz_ >> (4 + ch);
for (y = 0; y < 2; ++y) {
- int l = lnz.i8[ch + y];
+ int l = lnz & 1;
for (x = 0; x < 2; ++x) {
- const int ctx = l + tnz.i8[ch + x];
- const int nz =
- GetCoeffs(token_br, (ProbaArray)dec->proba_.coeffs_[2],
- ctx, q->uv_mat_, 0, dst);
- tnz.i8[ch + x] = l = (nz > 0);
- nz_dc.i8[y * 2 + x] = (dst[0] != 0);
- nz_ac.i8[y * 2 + x] = (nz > 1);
+ const int ctx = l + (tnz & 1);
+ const int nz = GetCoeffs(token_br, bands[2], ctx, q->uv_mat_, 0, dst);
+ l = (nz > 0);
+ tnz = (tnz >> 1) | (l << 3);
+ nz_coeffs = NzCodeBits(nz_coeffs, nz, dst[0] != 0);
dst += 16;
}
- lnz.i8[ch + y] = l;
+ tnz >>= 2;
+ lnz = (lnz >> 1) | (l << 5);
}
- non_zero_dc |= PACK(nz_dc, 8 - ch * 2);
- non_zero_ac |= PACK(nz_ac, 8 - ch * 2);
+ // Note: we don't really need the per-4x4 details for U/V blocks.
+ non_zero_uv |= nz_coeffs << (4 * ch);
+ out_t_nz |= (tnz << 4) << ch;
+ out_l_nz |= (lnz & 0xf0) << ch;
}
- out_t_nz |= PACK(tnz, 20);
- out_l_nz |= PACK(lnz, 20);
mb->nz_ = out_t_nz;
left_mb->nz_ = out_l_nz;
- dec->non_zero_ac_ = non_zero_ac;
- dec->non_zero_ = non_zero_ac | non_zero_dc;
- mb->skip_ = !dec->non_zero_;
+ block->non_zero_y_ = non_zero_y;
+ block->non_zero_uv_ = non_zero_uv;
+
+ // We look at the mode-code of each block and check if some blocks have less
+ // than three non-zero coeffs (code < 2). This is to avoid dithering flat and
+ // empty blocks.
+ block->dither_ = (non_zero_uv & 0xaaaa) ? 0 : q->dither_;
+
+ return !(non_zero_y | non_zero_uv); // will be used for further optimization
}
-#undef PACK
//------------------------------------------------------------------------------
// Main loop
@@ -635,7 +572,9 @@ static void ParseResiduals(VP8Decoder* const dec,
int VP8DecodeMB(VP8Decoder* const dec, VP8BitReader* const token_br) {
VP8BitReader* const br = &dec->br_;
VP8MB* const left = dec->mb_info_ - 1;
- VP8MB* const info = dec->mb_info_ + dec->mb_x_;
+ VP8MB* const mb = dec->mb_info_ + dec->mb_x_;
+ VP8MBData* const block = dec->mb_data_ + dec->mb_x_;
+ int skip;
// Note: we don't save segment map (yet), as we don't expect
// to decode more than 1 keyframe.
@@ -645,71 +584,64 @@ int VP8DecodeMB(VP8Decoder* const dec, VP8BitReader* const token_br) {
VP8GetBit(br, dec->proba_.segments_[1]) :
2 + VP8GetBit(br, dec->proba_.segments_[2]);
}
- info->skip_ = dec->use_skip_proba_ ? VP8GetBit(br, dec->skip_p_) : 0;
+ skip = dec->use_skip_proba_ ? VP8GetBit(br, dec->skip_p_) : 0;
VP8ParseIntraMode(br, dec);
if (br->eof_) {
return 0;
}
- if (!info->skip_) {
- ParseResiduals(dec, info, token_br);
+ if (!skip) {
+ skip = ParseResiduals(dec, mb, token_br);
} else {
- left->nz_ = info->nz_ = 0;
- if (!dec->is_i4x4_) {
- left->dc_nz_ = info->dc_nz_ = 0;
+ left->nz_ = mb->nz_ = 0;
+ if (!block->is_i4x4_) {
+ left->nz_dc_ = mb->nz_dc_ = 0;
}
- dec->non_zero_ = 0;
- dec->non_zero_ac_ = 0;
+ block->non_zero_y_ = 0;
+ block->non_zero_uv_ = 0;
}
if (dec->filter_type_ > 0) { // store filter info
VP8FInfo* const finfo = dec->f_info_ + dec->mb_x_;
- *finfo = dec->fstrengths_[dec->segment_][dec->is_i4x4_];
- finfo->f_inner_ = (!info->skip_ || dec->is_i4x4_);
+ *finfo = dec->fstrengths_[dec->segment_][block->is_i4x4_];
+ finfo->f_inner_ |= !skip;
}
- return (!token_br->eof_);
+ return !token_br->eof_;
}
void VP8InitScanline(VP8Decoder* const dec) {
VP8MB* const left = dec->mb_info_ - 1;
left->nz_ = 0;
- left->dc_nz_ = 0;
+ left->nz_dc_ = 0;
memset(dec->intra_l_, B_DC_PRED, sizeof(dec->intra_l_));
- dec->filter_row_ =
- (dec->filter_type_ > 0) &&
- (dec->mb_y_ >= dec->tl_mb_y_) && (dec->mb_y_ <= dec->br_mb_y_);
+ dec->mb_x_ = 0;
}
static int ParseFrame(VP8Decoder* const dec, VP8Io* io) {
for (dec->mb_y_ = 0; dec->mb_y_ < dec->br_mb_y_; ++dec->mb_y_) {
+ // Parse bitstream for this row.
VP8BitReader* const token_br =
&dec->parts_[dec->mb_y_ & (dec->num_parts_ - 1)];
- VP8InitScanline(dec);
- for (dec->mb_x_ = 0; dec->mb_x_ < dec->mb_w_; dec->mb_x_++) {
+ for (; dec->mb_x_ < dec->mb_w_; ++dec->mb_x_) {
if (!VP8DecodeMB(dec, token_br)) {
return VP8SetError(dec, VP8_STATUS_NOT_ENOUGH_DATA,
"Premature end-of-file encountered.");
}
- // Reconstruct and emit samples.
- VP8ReconstructBlock(dec);
}
+ VP8InitScanline(dec); // Prepare for next scanline
+
+ // Reconstruct, filter and emit the row.
if (!VP8ProcessRow(dec, io)) {
return VP8SetError(dec, VP8_STATUS_USER_ABORT, "Output aborted.");
}
}
- if (dec->use_threads_ && !WebPWorkerSync(&dec->worker_)) {
- return 0;
+ if (dec->mt_method_ > 0) {
+ if (!WebPWorkerSync(&dec->worker_)) return 0;
}
// Finish
-#ifndef ONLY_KEYFRAME_CODE
- if (!dec->update_proba_) {
- dec->proba_ = dec->proba_saved_;
- }
-#endif
-
#ifdef WEBP_EXPERIMENTAL_FEATURES
if (dec->layer_data_size_ > 0) {
if (!VP8DecodeLayer(dec)) {
@@ -765,12 +697,12 @@ void VP8Clear(VP8Decoder* const dec) {
if (dec == NULL) {
return;
}
- if (dec->use_threads_) {
+ if (dec->mt_method_ > 0) {
WebPWorkerEnd(&dec->worker_);
}
- if (dec->mem_) {
- free(dec->mem_);
- }
+ ALPHDelete(dec->alph_dec_);
+ dec->alph_dec_ = NULL;
+ free(dec->mem_);
dec->mem_ = NULL;
dec->mem_size_ = 0;
memset(&dec->br_, 0, sizeof(dec->br_));
@@ -779,6 +711,3 @@ void VP8Clear(VP8Decoder* const dec) {
//------------------------------------------------------------------------------
-#if defined(__cplusplus) || defined(c_plusplus)
-} // extern "C"
-#endif
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