438 lines
14 KiB
C
438 lines
14 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
|
|
//
|
|
// This code is licensed under the same terms as WebM:
|
|
// Software License Agreement: http://www.webmproject.org/license/software/
|
|
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// Header syntax writing
|
|
//
|
|
// Author: Skal (pascal.massimino@gmail.com)
|
|
|
|
#include <assert.h>
|
|
|
|
#include "../webp/format_constants.h"
|
|
#include "./vp8enci.h"
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Helper functions
|
|
|
|
// TODO(later): Move to webp/format_constants.h?
|
|
static void PutLE24(uint8_t* const data, uint32_t val) {
|
|
data[0] = (val >> 0) & 0xff;
|
|
data[1] = (val >> 8) & 0xff;
|
|
data[2] = (val >> 16) & 0xff;
|
|
}
|
|
|
|
static void PutLE32(uint8_t* const data, uint32_t val) {
|
|
PutLE24(data, val);
|
|
data[3] = (val >> 24) & 0xff;
|
|
}
|
|
|
|
static int IsVP8XNeeded(const VP8Encoder* const enc) {
|
|
return !!enc->has_alpha_; // Currently the only case when VP8X is needed.
|
|
// This could change in the future.
|
|
}
|
|
|
|
static int PutPaddingByte(const WebPPicture* const pic) {
|
|
|
|
const uint8_t pad_byte[1] = { 0 };
|
|
return !!pic->writer(pad_byte, 1, pic);
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Writers for header's various pieces (in order of appearance)
|
|
|
|
static WebPEncodingError PutRIFFHeader(const VP8Encoder* const enc,
|
|
size_t riff_size) {
|
|
const WebPPicture* const pic = enc->pic_;
|
|
uint8_t riff[RIFF_HEADER_SIZE] = {
|
|
'R', 'I', 'F', 'F', 0, 0, 0, 0, 'W', 'E', 'B', 'P'
|
|
};
|
|
assert(riff_size == (uint32_t)riff_size);
|
|
PutLE32(riff + TAG_SIZE, (uint32_t)riff_size);
|
|
if (!pic->writer(riff, sizeof(riff), pic)) {
|
|
return VP8_ENC_ERROR_BAD_WRITE;
|
|
}
|
|
return VP8_ENC_OK;
|
|
}
|
|
|
|
static WebPEncodingError PutVP8XHeader(const VP8Encoder* const enc) {
|
|
const WebPPicture* const pic = enc->pic_;
|
|
uint8_t vp8x[CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE] = {
|
|
'V', 'P', '8', 'X'
|
|
};
|
|
uint32_t flags = 0;
|
|
|
|
assert(IsVP8XNeeded(enc));
|
|
assert(pic->width >= 1 && pic->height >= 1);
|
|
assert(pic->width <= MAX_CANVAS_SIZE && pic->height <= MAX_CANVAS_SIZE);
|
|
|
|
if (enc->has_alpha_) {
|
|
flags |= ALPHA_FLAG_BIT;
|
|
}
|
|
|
|
PutLE32(vp8x + TAG_SIZE, VP8X_CHUNK_SIZE);
|
|
PutLE32(vp8x + CHUNK_HEADER_SIZE, flags);
|
|
PutLE24(vp8x + CHUNK_HEADER_SIZE + 4, pic->width - 1);
|
|
PutLE24(vp8x + CHUNK_HEADER_SIZE + 7, pic->height - 1);
|
|
if(!pic->writer(vp8x, sizeof(vp8x), pic)) {
|
|
return VP8_ENC_ERROR_BAD_WRITE;
|
|
}
|
|
return VP8_ENC_OK;
|
|
}
|
|
|
|
static WebPEncodingError PutAlphaChunk(const VP8Encoder* const enc) {
|
|
const WebPPicture* const pic = enc->pic_;
|
|
uint8_t alpha_chunk_hdr[CHUNK_HEADER_SIZE] = {
|
|
'A', 'L', 'P', 'H'
|
|
};
|
|
|
|
assert(enc->has_alpha_);
|
|
|
|
// Alpha chunk header.
|
|
PutLE32(alpha_chunk_hdr + TAG_SIZE, enc->alpha_data_size_);
|
|
if (!pic->writer(alpha_chunk_hdr, sizeof(alpha_chunk_hdr), pic)) {
|
|
return VP8_ENC_ERROR_BAD_WRITE;
|
|
}
|
|
|
|
// Alpha chunk data.
|
|
if (!pic->writer(enc->alpha_data_, enc->alpha_data_size_, pic)) {
|
|
return VP8_ENC_ERROR_BAD_WRITE;
|
|
}
|
|
|
|
// Padding.
|
|
if ((enc->alpha_data_size_ & 1) && !PutPaddingByte(pic)) {
|
|
return VP8_ENC_ERROR_BAD_WRITE;
|
|
}
|
|
return VP8_ENC_OK;
|
|
}
|
|
|
|
static WebPEncodingError PutVP8Header(const WebPPicture* const pic,
|
|
size_t vp8_size) {
|
|
uint8_t vp8_chunk_hdr[CHUNK_HEADER_SIZE] = {
|
|
'V', 'P', '8', ' '
|
|
};
|
|
assert(vp8_size == (uint32_t)vp8_size);
|
|
PutLE32(vp8_chunk_hdr + TAG_SIZE, (uint32_t)vp8_size);
|
|
if (!pic->writer(vp8_chunk_hdr, sizeof(vp8_chunk_hdr), pic)) {
|
|
return VP8_ENC_ERROR_BAD_WRITE;
|
|
}
|
|
return VP8_ENC_OK;
|
|
}
|
|
|
|
static WebPEncodingError PutVP8FrameHeader(const WebPPicture* const pic,
|
|
int profile, size_t size0) {
|
|
uint8_t vp8_frm_hdr[VP8_FRAME_HEADER_SIZE];
|
|
uint32_t bits;
|
|
|
|
if (size0 >= VP8_MAX_PARTITION0_SIZE) { // partition #0 is too big to fit
|
|
return VP8_ENC_ERROR_PARTITION0_OVERFLOW;
|
|
}
|
|
|
|
// Paragraph 9.1.
|
|
bits = 0 // keyframe (1b)
|
|
| (profile << 1) // profile (3b)
|
|
| (1 << 4) // visible (1b)
|
|
| ((uint32_t)size0 << 5); // partition length (19b)
|
|
vp8_frm_hdr[0] = (bits >> 0) & 0xff;
|
|
vp8_frm_hdr[1] = (bits >> 8) & 0xff;
|
|
vp8_frm_hdr[2] = (bits >> 16) & 0xff;
|
|
// signature
|
|
vp8_frm_hdr[3] = (VP8_SIGNATURE >> 16) & 0xff;
|
|
vp8_frm_hdr[4] = (VP8_SIGNATURE >> 8) & 0xff;
|
|
vp8_frm_hdr[5] = (VP8_SIGNATURE >> 0) & 0xff;
|
|
// dimensions
|
|
vp8_frm_hdr[6] = pic->width & 0xff;
|
|
vp8_frm_hdr[7] = pic->width >> 8;
|
|
vp8_frm_hdr[8] = pic->height & 0xff;
|
|
vp8_frm_hdr[9] = pic->height >> 8;
|
|
|
|
if (!pic->writer(vp8_frm_hdr, sizeof(vp8_frm_hdr), pic)) {
|
|
return VP8_ENC_ERROR_BAD_WRITE;
|
|
}
|
|
return VP8_ENC_OK;
|
|
}
|
|
|
|
// WebP Headers.
|
|
static int PutWebPHeaders(const VP8Encoder* const enc, size_t size0,
|
|
size_t vp8_size, size_t riff_size) {
|
|
WebPPicture* const pic = enc->pic_;
|
|
WebPEncodingError err = VP8_ENC_OK;
|
|
|
|
// RIFF header.
|
|
err = PutRIFFHeader(enc, riff_size);
|
|
if (err != VP8_ENC_OK) goto Error;
|
|
|
|
// VP8X.
|
|
if (IsVP8XNeeded(enc)) {
|
|
err = PutVP8XHeader(enc);
|
|
if (err != VP8_ENC_OK) goto Error;
|
|
}
|
|
|
|
// Alpha.
|
|
if (enc->has_alpha_) {
|
|
err = PutAlphaChunk(enc);
|
|
if (err != VP8_ENC_OK) goto Error;
|
|
}
|
|
|
|
// VP8 header.
|
|
err = PutVP8Header(pic, vp8_size);
|
|
if (err != VP8_ENC_OK) goto Error;
|
|
|
|
// VP8 frame header.
|
|
err = PutVP8FrameHeader(pic, enc->profile_, size0);
|
|
if (err != VP8_ENC_OK) goto Error;
|
|
|
|
// All OK.
|
|
return 1;
|
|
|
|
// Error.
|
|
Error:
|
|
return WebPEncodingSetError(pic, err);
|
|
}
|
|
|
|
// Segmentation header
|
|
static void PutSegmentHeader(VP8BitWriter* const bw,
|
|
const VP8Encoder* const enc) {
|
|
const VP8SegmentHeader* const hdr = &enc->segment_hdr_;
|
|
const VP8Proba* const proba = &enc->proba_;
|
|
if (VP8PutBitUniform(bw, (hdr->num_segments_ > 1))) {
|
|
// We always 'update' the quant and filter strength values
|
|
const int update_data = 1;
|
|
int s;
|
|
VP8PutBitUniform(bw, hdr->update_map_);
|
|
if (VP8PutBitUniform(bw, update_data)) {
|
|
// we always use absolute values, not relative ones
|
|
VP8PutBitUniform(bw, 1); // (segment_feature_mode = 1. Paragraph 9.3.)
|
|
for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
|
|
VP8PutSignedValue(bw, enc->dqm_[s].quant_, 7);
|
|
}
|
|
for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
|
|
VP8PutSignedValue(bw, enc->dqm_[s].fstrength_, 6);
|
|
}
|
|
}
|
|
if (hdr->update_map_) {
|
|
for (s = 0; s < 3; ++s) {
|
|
if (VP8PutBitUniform(bw, (proba->segments_[s] != 255u))) {
|
|
VP8PutValue(bw, proba->segments_[s], 8);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Filtering parameters header
|
|
static void PutFilterHeader(VP8BitWriter* const bw,
|
|
const VP8FilterHeader* const hdr) {
|
|
const int use_lf_delta = (hdr->i4x4_lf_delta_ != 0);
|
|
VP8PutBitUniform(bw, hdr->simple_);
|
|
VP8PutValue(bw, hdr->level_, 6);
|
|
VP8PutValue(bw, hdr->sharpness_, 3);
|
|
if (VP8PutBitUniform(bw, use_lf_delta)) {
|
|
// '0' is the default value for i4x4_lf_delta_ at frame #0.
|
|
const int need_update = (hdr->i4x4_lf_delta_ != 0);
|
|
if (VP8PutBitUniform(bw, need_update)) {
|
|
// we don't use ref_lf_delta => emit four 0 bits
|
|
VP8PutValue(bw, 0, 4);
|
|
// we use mode_lf_delta for i4x4
|
|
VP8PutSignedValue(bw, hdr->i4x4_lf_delta_, 6);
|
|
VP8PutValue(bw, 0, 3); // all others unused
|
|
}
|
|
}
|
|
}
|
|
|
|
// Nominal quantization parameters
|
|
static void PutQuant(VP8BitWriter* const bw,
|
|
const VP8Encoder* const enc) {
|
|
VP8PutValue(bw, enc->base_quant_, 7);
|
|
VP8PutSignedValue(bw, enc->dq_y1_dc_, 4);
|
|
VP8PutSignedValue(bw, enc->dq_y2_dc_, 4);
|
|
VP8PutSignedValue(bw, enc->dq_y2_ac_, 4);
|
|
VP8PutSignedValue(bw, enc->dq_uv_dc_, 4);
|
|
VP8PutSignedValue(bw, enc->dq_uv_ac_, 4);
|
|
}
|
|
|
|
// Partition sizes
|
|
static int EmitPartitionsSize(const VP8Encoder* const enc,
|
|
WebPPicture* const pic) {
|
|
uint8_t buf[3 * (MAX_NUM_PARTITIONS - 1)];
|
|
int p;
|
|
for (p = 0; p < enc->num_parts_ - 1; ++p) {
|
|
const size_t part_size = VP8BitWriterSize(enc->parts_ + p);
|
|
if (part_size >= VP8_MAX_PARTITION_SIZE) {
|
|
return WebPEncodingSetError(pic, VP8_ENC_ERROR_PARTITION_OVERFLOW);
|
|
}
|
|
buf[3 * p + 0] = (part_size >> 0) & 0xff;
|
|
buf[3 * p + 1] = (part_size >> 8) & 0xff;
|
|
buf[3 * p + 2] = (part_size >> 16) & 0xff;
|
|
}
|
|
return p ? pic->writer(buf, 3 * p, pic) : 1;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
#ifdef WEBP_EXPERIMENTAL_FEATURES
|
|
|
|
#define KTRAILER_SIZE 8
|
|
|
|
static int WriteExtensions(VP8Encoder* const enc) {
|
|
uint8_t buffer[KTRAILER_SIZE];
|
|
VP8BitWriter* const bw = &enc->bw_;
|
|
WebPPicture* const pic = enc->pic_;
|
|
|
|
// Layer (bytes 0..3)
|
|
PutLE24(buffer + 0, enc->layer_data_size_);
|
|
buffer[3] = enc->pic_->colorspace & WEBP_CSP_UV_MASK;
|
|
if (enc->layer_data_size_ > 0) {
|
|
assert(enc->use_layer_);
|
|
// append layer data to last partition
|
|
if (!VP8BitWriterAppend(&enc->parts_[enc->num_parts_ - 1],
|
|
enc->layer_data_, enc->layer_data_size_)) {
|
|
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY);
|
|
}
|
|
}
|
|
|
|
buffer[KTRAILER_SIZE - 1] = 0x01; // marker
|
|
if (!VP8BitWriterAppend(bw, buffer, KTRAILER_SIZE)) {
|
|
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#endif /* WEBP_EXPERIMENTAL_FEATURES */
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
static size_t GeneratePartition0(VP8Encoder* const enc) {
|
|
VP8BitWriter* const bw = &enc->bw_;
|
|
const int mb_size = enc->mb_w_ * enc->mb_h_;
|
|
uint64_t pos1, pos2, pos3;
|
|
#ifdef WEBP_EXPERIMENTAL_FEATURES
|
|
const int need_extensions = enc->use_layer_;
|
|
#endif
|
|
|
|
pos1 = VP8BitWriterPos(bw);
|
|
VP8BitWriterInit(bw, mb_size * 7 / 8); // ~7 bits per macroblock
|
|
#ifdef WEBP_EXPERIMENTAL_FEATURES
|
|
VP8PutBitUniform(bw, need_extensions); // extensions
|
|
#else
|
|
VP8PutBitUniform(bw, 0); // colorspace
|
|
#endif
|
|
VP8PutBitUniform(bw, 0); // clamp type
|
|
|
|
PutSegmentHeader(bw, enc);
|
|
PutFilterHeader(bw, &enc->filter_hdr_);
|
|
VP8PutValue(bw, enc->config_->partitions, 2);
|
|
PutQuant(bw, enc);
|
|
VP8PutBitUniform(bw, 0); // no proba update
|
|
VP8WriteProbas(bw, &enc->proba_);
|
|
pos2 = VP8BitWriterPos(bw);
|
|
VP8CodeIntraModes(enc);
|
|
VP8BitWriterFinish(bw);
|
|
|
|
#ifdef WEBP_EXPERIMENTAL_FEATURES
|
|
if (need_extensions && !WriteExtensions(enc)) {
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
pos3 = VP8BitWriterPos(bw);
|
|
|
|
if (enc->pic_->stats) {
|
|
enc->pic_->stats->header_bytes[0] = (int)((pos2 - pos1 + 7) >> 3);
|
|
enc->pic_->stats->header_bytes[1] = (int)((pos3 - pos2 + 7) >> 3);
|
|
enc->pic_->stats->alpha_data_size = (int)enc->alpha_data_size_;
|
|
enc->pic_->stats->layer_data_size = (int)enc->layer_data_size_;
|
|
}
|
|
return !bw->error_;
|
|
}
|
|
|
|
void VP8EncFreeBitWriters(VP8Encoder* const enc) {
|
|
int p;
|
|
VP8BitWriterWipeOut(&enc->bw_);
|
|
for (p = 0; p < enc->num_parts_; ++p) {
|
|
VP8BitWriterWipeOut(enc->parts_ + p);
|
|
}
|
|
}
|
|
|
|
int VP8EncWrite(VP8Encoder* const enc) {
|
|
WebPPicture* const pic = enc->pic_;
|
|
VP8BitWriter* const bw = &enc->bw_;
|
|
const int task_percent = 19;
|
|
const int percent_per_part = task_percent / enc->num_parts_;
|
|
const int final_percent = enc->percent_ + task_percent;
|
|
int ok = 0;
|
|
size_t vp8_size, pad, riff_size;
|
|
int p;
|
|
|
|
// Partition #0 with header and partition sizes
|
|
ok = !!GeneratePartition0(enc);
|
|
|
|
// Compute VP8 size
|
|
vp8_size = VP8_FRAME_HEADER_SIZE +
|
|
VP8BitWriterSize(bw) +
|
|
3 * (enc->num_parts_ - 1);
|
|
for (p = 0; p < enc->num_parts_; ++p) {
|
|
vp8_size += VP8BitWriterSize(enc->parts_ + p);
|
|
}
|
|
pad = vp8_size & 1;
|
|
vp8_size += pad;
|
|
|
|
// Compute RIFF size
|
|
// At the minimum it is: "WEBPVP8 nnnn" + VP8 data size.
|
|
riff_size = TAG_SIZE + CHUNK_HEADER_SIZE + vp8_size;
|
|
if (IsVP8XNeeded(enc)) { // Add size for: VP8X header + data.
|
|
riff_size += CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE;
|
|
}
|
|
if (enc->has_alpha_) { // Add size for: ALPH header + data.
|
|
const uint32_t padded_alpha_size = enc->alpha_data_size_ +
|
|
(enc->alpha_data_size_ & 1);
|
|
riff_size += CHUNK_HEADER_SIZE + padded_alpha_size;
|
|
}
|
|
// Sanity check.
|
|
if (riff_size > 0xfffffffeU) {
|
|
return WebPEncodingSetError(pic, VP8_ENC_ERROR_FILE_TOO_BIG);
|
|
}
|
|
|
|
// Emit headers and partition #0
|
|
{
|
|
const uint8_t* const part0 = VP8BitWriterBuf(bw);
|
|
const size_t size0 = VP8BitWriterSize(bw);
|
|
ok = ok && PutWebPHeaders(enc, size0, vp8_size, riff_size)
|
|
&& pic->writer(part0, size0, pic)
|
|
&& EmitPartitionsSize(enc, pic);
|
|
VP8BitWriterWipeOut(bw); // will free the internal buffer.
|
|
}
|
|
|
|
// Token partitions
|
|
for (p = 0; p < enc->num_parts_; ++p) {
|
|
const uint8_t* const buf = VP8BitWriterBuf(enc->parts_ + p);
|
|
const size_t size = VP8BitWriterSize(enc->parts_ + p);
|
|
if (size)
|
|
ok = ok && pic->writer(buf, size, pic);
|
|
VP8BitWriterWipeOut(enc->parts_ + p); // will free the internal buffer.
|
|
ok = ok && WebPReportProgress(pic, enc->percent_ + percent_per_part,
|
|
&enc->percent_);
|
|
}
|
|
|
|
// Padding byte
|
|
if (ok && pad) {
|
|
ok = PutPaddingByte(pic);
|
|
}
|
|
|
|
enc->coded_size_ = (int)(CHUNK_HEADER_SIZE + riff_size);
|
|
ok = ok && WebPReportProgress(pic, final_percent, &enc->percent_);
|
|
return ok;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
} // extern "C"
|
|
#endif
|