gstreamer/gst-libs/gst/codecparsers/gstvp9parser.c

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/* gstvp9parser.c
*
* Copyright (C) 2013-2014 Intel Corporation
* Copyright (C) 2015 Intel Corporation
* Author: XuGuangxin<Guangxin.Xu@intel.com>
* Author: Sreerenj Balachandran<sreerenj.balachandran@intel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstvp9parser
* @title: GstVp9Parser
* @short_description: Convenience library for parsing vp9 video bitstream.
*
* For more details about the structures, you can refer to the
* specifications:
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <gst/base/gstbitreader.h>
#include "vp9utils.h"
#include "gstvp9parser.h"
#define MIN_TILE_WIDTH_B64 4
#define MAX_TILE_WIDTH_B64 64
/* order of sb64, where sb64 = 64x64 */
#define ALIGN_SB64(w) ((w + 63) >> 6)
GST_DEBUG_CATEGORY_STATIC (gst_vp9_parser_debug);
#define GST_CAT_DEFAULT gst_vp9_parser_debug
static gboolean initialized = FALSE;
#define INITIALIZE_DEBUG_CATEGORY \
if (!initialized) { \
GST_DEBUG_CATEGORY_INIT (gst_vp9_parser_debug, "codecparsers_vp9", 0, \
"vp9 parser library"); \
initialized = TRUE; \
}
#define gst_vp9_read_bit(br) gst_bit_reader_get_bits_uint8_unchecked(br, 1)
#define gst_vp9_read_bits(br, bits) gst_bit_reader_get_bits_uint32_unchecked(br, bits)
#define GST_VP9_PARSER_GET_PRIVATE(parser) ((GstVp9ParserPrivate *)(parser->priv))
typedef struct _ReferenceSize
{
guint32 width;
guint32 height;
} ReferenceSize;
typedef struct
{
/* for loop filters */
gint8 ref_deltas[GST_VP9_MAX_REF_LF_DELTAS];
gint8 mode_deltas[GST_VP9_MAX_MODE_LF_DELTAS];
guint8 segmentation_abs_delta;
GstVp9SegmentationInfoData segmentation[GST_VP9_MAX_SEGMENTS];
ReferenceSize reference[GST_VP9_REF_FRAMES];
} GstVp9ParserPrivate;
static gint32
gst_vp9_read_signed_bits (GstBitReader * br, int bits)
{
const gint32 value = gst_vp9_read_bits (br, bits);
return gst_vp9_read_bit (br) ? -value : value;
}
static gboolean
verify_frame_marker (GstBitReader * br)
{
guint8 frame_marker = gst_vp9_read_bits (br, 2);
if (frame_marker != GST_VP9_FRAME_MARKER) {
GST_ERROR ("Invalid VP9 Frame Marker !");
return FALSE;
}
return TRUE;
}
static gboolean
verify_sync_code (GstBitReader * const br)
{
return (gst_vp9_read_bits (br, 24) == GST_VP9_SYNC_CODE);
}
static gboolean
parse_bitdepth_colorspace_sampling (GstVp9Parser * parser,
GstBitReader * const br, GstVp9FrameHdr * frame_hdr)
{
if (frame_hdr->profile > GST_VP9_PROFILE_1)
parser->bit_depth =
gst_vp9_read_bit (br) ? GST_VP9_BIT_DEPTH_12 : GST_VP9_BIT_DEPTH_10;
else
parser->bit_depth = GST_VP9_BIT_DEPTH_8;
parser->color_space = gst_vp9_read_bits (br, 3);
if (parser->color_space != GST_VP9_CS_SRGB) {
parser->color_range = gst_vp9_read_bit (br);
if (frame_hdr->profile == GST_VP9_PROFILE_1
|| frame_hdr->profile == GST_VP9_PROFILE_3) {
parser->subsampling_x = gst_vp9_read_bit (br);
parser->subsampling_y = gst_vp9_read_bit (br);
if (parser->subsampling_x == 1 && parser->subsampling_y == 1) {
GST_ERROR
("4:2:0 subsampling is not supported in profile_1 or profile_3");
goto error;
}
if (gst_vp9_read_bit (br)) {
GST_ERROR ("Reserved bit set!");
goto error;
}
} else {
parser->subsampling_y = parser->subsampling_x = 1;
}
} else {
parser->color_range = GST_VP9_CR_FULL;
if (frame_hdr->profile == GST_VP9_PROFILE_1
|| frame_hdr->profile == GST_VP9_PROFILE_3) {
if (gst_vp9_read_bit (br)) {
GST_ERROR ("Reserved bit set!");
goto error;
}
} else {
GST_ERROR
("4:4:4 subsampling is not supported in profile_0 and profile_2");
goto error;
}
}
return TRUE;
error:
return FALSE;
}
static guint
parse_profile (GstBitReader * br)
{
guint8 profile = gst_vp9_read_bit (br);
profile |= gst_vp9_read_bit (br) << 1;
if (profile > 2)
profile += gst_vp9_read_bit (br);
return profile;
}
static void
parse_frame_size (GstBitReader * br, guint32 * width, guint32 * height)
{
const guint32 w = gst_vp9_read_bits (br, 16) + 1;
const guint32 h = gst_vp9_read_bits (br, 16) + 1;
*width = w;
*height = h;
}
static void
parse_display_frame_size (GstBitReader * br, GstVp9FrameHdr * frame_hdr)
{
frame_hdr->display_size_enabled = gst_vp9_read_bit (br);
if (frame_hdr->display_size_enabled)
parse_frame_size (br, &frame_hdr->display_width,
&frame_hdr->display_height);
}
static void
parse_frame_size_from_refs (const GstVp9Parser * parser,
GstVp9FrameHdr * frame_hdr, GstBitReader * br)
{
gboolean found = FALSE;
int i;
GstVp9ParserPrivate *priv = GST_VP9_PARSER_GET_PRIVATE (parser);
for (i = 0; i < GST_VP9_REFS_PER_FRAME; i++) {
found = gst_vp9_read_bit (br);
if (found) {
guint8 idx = frame_hdr->ref_frame_indices[i];
frame_hdr->width = priv->reference[idx].width;
frame_hdr->height = priv->reference[idx].height;
break;
}
}
if (!found)
parse_frame_size (br, &frame_hdr->width, &frame_hdr->height);
}
static GstVp9InterpolationFilter
parse_interp_filter (GstBitReader * br)
{
static const GstVp9InterpolationFilter filter_map[] = {
GST_VP9_INTERPOLATION_FILTER_EIGHTTAP_SMOOTH,
GST_VP9_INTERPOLATION_FILTER_EIGHTTAP,
GST_VP9_INTERPOLATION_FILTER_EIGHTTAP_SHARP,
GST_VP9_INTERPOLATION_FILTER_BILINEAR
};
return gst_vp9_read_bit (br) ? GST_VP9_INTERPOLATION_FILTER_SWITCHABLE :
filter_map[gst_vp9_read_bits (br, 2)];
}
static void
parse_loopfilter (GstVp9LoopFilter * lf, GstBitReader * br)
{
lf->filter_level = gst_vp9_read_bits (br, 6);
lf->sharpness_level = gst_vp9_read_bits (br, 3);
lf->mode_ref_delta_update = 0;
lf->mode_ref_delta_enabled = gst_vp9_read_bit (br);
if (lf->mode_ref_delta_enabled) {
lf->mode_ref_delta_update = gst_vp9_read_bit (br);
if (lf->mode_ref_delta_update) {
int i;
for (i = 0; i < GST_VP9_MAX_REF_LF_DELTAS; i++) {
lf->update_ref_deltas[i] = gst_vp9_read_bit (br);
if (lf->update_ref_deltas[i])
lf->ref_deltas[i] = gst_vp9_read_signed_bits (br, 6);
}
for (i = 0; i < GST_VP9_MAX_MODE_LF_DELTAS; i++) {
lf->update_mode_deltas[i] = gst_vp9_read_bit (br);
if (lf->update_mode_deltas[i])
lf->mode_deltas[i] = gst_vp9_read_signed_bits (br, 6);
}
}
}
}
static gint8
parse_delta_q (GstBitReader * br)
{
return gst_vp9_read_bit (br) ? gst_vp9_read_signed_bits (br, 4) : 0;
}
static void
parse_quantization (GstVp9QuantIndices * quant_indices, GstBitReader * br)
{
quant_indices->y_ac_qi = gst_vp9_read_bits (br, QINDEX_BITS);
quant_indices->y_dc_delta = parse_delta_q (br);
quant_indices->uv_dc_delta = parse_delta_q (br);
quant_indices->uv_ac_delta = parse_delta_q (br);
}
static void
parse_segmentation (GstVp9SegmentationInfo * seg, GstBitReader * br)
{
int i;
seg->update_map = FALSE;
seg->update_data = FALSE;
seg->enabled = gst_vp9_read_bit (br);
if (!seg->enabled)
return;
/* Segmentation map update */
seg->update_map = gst_vp9_read_bit (br);
if (seg->update_map) {
for (i = 0; i < GST_VP9_SEG_TREE_PROBS; i++) {
seg->update_tree_probs[i] = gst_vp9_read_bit (br);
seg->tree_probs[i] = seg->update_tree_probs[i] ?
gst_vp9_read_bits (br, 8) : GST_VP9_MAX_PROB;
}
seg->temporal_update = gst_vp9_read_bit (br);
if (seg->temporal_update) {
for (i = 0; i < GST_VP9_PREDICTION_PROBS; i++) {
seg->update_pred_probs[i] = gst_vp9_read_bit (br);
seg->pred_probs[i] = seg->update_pred_probs[i] ?
gst_vp9_read_bits (br, 8) : GST_VP9_MAX_PROB;
}
} else {
for (i = 0; i < GST_VP9_PREDICTION_PROBS; i++)
seg->pred_probs[i] = GST_VP9_MAX_PROB;
}
}
/* Segmentation data update */
seg->update_data = gst_vp9_read_bit (br);
if (seg->update_data) {
/* clear all features */
memset (seg->data, 0, sizeof (seg->data));
seg->abs_delta = gst_vp9_read_bit (br);
for (i = 0; i < GST_VP9_MAX_SEGMENTS; i++) {
GstVp9SegmentationInfoData *seg_data = seg->data + i;
guint8 data;
/* SEG_LVL_ALT_Q */
seg_data->alternate_quantizer_enabled = gst_vp9_read_bit (br);
if (seg_data->alternate_quantizer_enabled) {
data = gst_vp9_read_bits (br, 8);
seg_data->alternate_quantizer = gst_vp9_read_bit (br) ? -data : data;
}
/* SEG_LVL_ALT_LF */
seg_data->alternate_loop_filter_enabled = gst_vp9_read_bit (br);
if (seg_data->alternate_loop_filter_enabled) {
data = gst_vp9_read_bits (br, 6);
seg_data->alternate_loop_filter = gst_vp9_read_bit (br) ? -data : data;
}
/* SEG_LVL_REF_FRAME */
seg_data->reference_frame_enabled = gst_vp9_read_bit (br);
if (seg_data->reference_frame_enabled) {
seg_data->reference_frame = gst_vp9_read_bits (br, 2);
}
seg_data->reference_skip = gst_vp9_read_bit (br);
}
}
}
static guint32
get_max_lb_tile_cols (guint32 sb_cols)
{
gint max_log2 = 1;
while ((sb_cols >> max_log2) >= MIN_TILE_WIDTH_B64)
++max_log2;
return max_log2 - 1;
}
static guint32
get_min_lb_tile_cols (guint32 sb_cols)
{
gint min_log2 = 0;
while ((MAX_TILE_WIDTH_B64 << min_log2) < sb_cols)
++min_log2;
return min_log2;
}
static gboolean
parse_tile_info (GstVp9FrameHdr * frame_hdr, GstBitReader * br)
{
guint32 max_ones;
const guint32 sb_cols = ALIGN_SB64 (frame_hdr->width);
guint32 min_lb_tile_cols = get_min_lb_tile_cols (sb_cols);
guint32 max_lb_tile_cols = get_max_lb_tile_cols (sb_cols);
g_assert (min_lb_tile_cols <= max_lb_tile_cols);
max_ones = max_lb_tile_cols - min_lb_tile_cols;
/* columns */
frame_hdr->log2_tile_columns = min_lb_tile_cols;
while (max_ones-- && gst_vp9_read_bit (br))
frame_hdr->log2_tile_columns++;
if (frame_hdr->log2_tile_columns > 6) {
GST_ERROR ("Invalid number of tile columns..!");
return FALSE;
}
/* row */
frame_hdr->log2_tile_rows = gst_vp9_read_bit (br);
if (frame_hdr->log2_tile_rows)
frame_hdr->log2_tile_rows += gst_vp9_read_bit (br);
return TRUE;
}
static void
loop_filter_update (GstVp9Parser * parser, const GstVp9LoopFilter * lf)
{
GstVp9ParserPrivate *priv = GST_VP9_PARSER_GET_PRIVATE (parser);
int i;
for (i = 0; i < GST_VP9_MAX_REF_LF_DELTAS; i++) {
if (lf->update_ref_deltas[i])
priv->ref_deltas[i] = lf->ref_deltas[i];
}
for (i = 0; i < GST_VP9_MAX_MODE_LF_DELTAS; i++) {
if (lf->update_mode_deltas[i])
priv->mode_deltas[i] = lf->mode_deltas[i];
}
}
static guint8
seg_get_base_qindex (const GstVp9Parser * parser,
const GstVp9FrameHdr * frame_hdr, int segid)
{
int seg_base = frame_hdr->quant_indices.y_ac_qi;
GstVp9ParserPrivate *priv = GST_VP9_PARSER_GET_PRIVATE (parser);
const GstVp9SegmentationInfoData *seg = priv->segmentation + segid;
/* DEBUG("id = %d, seg_base = %d, seg enable = %d, alt eanble = %d, abs = %d, alt= %d\n",segid,
seg_base, frame_hdr->segmentation.enabled, seg->alternate_quantizer_enabled, priv->segmentation_abs_delta, seg->alternate_quantizer);
*/
if (frame_hdr->segmentation.enabled && seg->alternate_quantizer_enabled) {
if (priv->segmentation_abs_delta)
seg_base = seg->alternate_quantizer;
else
seg_base += seg->alternate_quantizer;
}
return CLAMP (seg_base, 0, MAXQ);
}
static guint8
seg_get_filter_level (const GstVp9Parser * parser,
const GstVp9FrameHdr * frame_hdr, int segid)
{
int seg_filter = frame_hdr->loopfilter.filter_level;
GstVp9ParserPrivate *priv = GST_VP9_PARSER_GET_PRIVATE (parser);
const GstVp9SegmentationInfoData *seg = priv->segmentation + segid;
if (frame_hdr->segmentation.enabled && seg->alternate_loop_filter_enabled) {
if (priv->segmentation_abs_delta)
seg_filter = seg->alternate_loop_filter;
else
seg_filter += seg->alternate_loop_filter;
}
return CLAMP (seg_filter, 0, GST_VP9_MAX_LOOP_FILTER);
}
/*save segmentation info from frame header to parser*/
static void
segmentation_save (GstVp9Parser * parser, const GstVp9FrameHdr * frame_hdr)
{
const GstVp9SegmentationInfo *info = &frame_hdr->segmentation;
if (!info->enabled)
return;
if (info->update_map) {
g_assert (G_N_ELEMENTS (parser->mb_segment_tree_probs) ==
G_N_ELEMENTS (info->tree_probs));
g_assert (G_N_ELEMENTS (parser->segment_pred_probs) ==
G_N_ELEMENTS (info->pred_probs));
memcpy (parser->mb_segment_tree_probs, info->tree_probs,
sizeof (info->tree_probs));
memcpy (parser->segment_pred_probs, info->pred_probs,
sizeof (info->pred_probs));
}
if (info->update_data) {
GstVp9ParserPrivate *priv = GST_VP9_PARSER_GET_PRIVATE (parser);
priv->segmentation_abs_delta = info->abs_delta;
g_assert (G_N_ELEMENTS (priv->segmentation) == G_N_ELEMENTS (info->data));
memcpy (priv->segmentation, info->data, sizeof (info->data));
}
}
static void
segmentation_update (GstVp9Parser * parser, const GstVp9FrameHdr * frame_hdr)
{
int i = 0;
const GstVp9ParserPrivate *priv = GST_VP9_PARSER_GET_PRIVATE (parser);
const GstVp9LoopFilter *lf = &frame_hdr->loopfilter;
const GstVp9QuantIndices *quant_indices = &frame_hdr->quant_indices;
int default_filter = lf->filter_level;
const int scale = 1 << (default_filter >> 5);
segmentation_save (parser, frame_hdr);
for (i = 0; i < GST_VP9_MAX_SEGMENTS; i++) {
guint8 q = seg_get_base_qindex (parser, frame_hdr, i);
GstVp9Segmentation *seg = parser->segmentation + i;
const GstVp9SegmentationInfoData *info = priv->segmentation + i;
seg->luma_dc_quant_scale =
gst_vp9_dc_quant (q, quant_indices->y_dc_delta, parser->bit_depth);
seg->luma_ac_quant_scale = gst_vp9_ac_quant (q, 0, parser->bit_depth);
seg->chroma_dc_quant_scale =
gst_vp9_dc_quant (q, quant_indices->uv_dc_delta, parser->bit_depth);
seg->chroma_ac_quant_scale =
gst_vp9_ac_quant (q, quant_indices->uv_ac_delta, parser->bit_depth);
if (lf->filter_level) {
guint8 filter = seg_get_filter_level (parser, frame_hdr, i);
if (!lf->mode_ref_delta_enabled) {
memset (seg->filter_level, filter, sizeof (seg->filter_level));
} else {
int ref, mode;
const int intra_filter =
filter + priv->ref_deltas[GST_VP9_REF_FRAME_INTRA] * scale;
seg->filter_level[GST_VP9_REF_FRAME_INTRA][0] =
CLAMP (intra_filter, 0, GST_VP9_MAX_LOOP_FILTER);
for (ref = GST_VP9_REF_FRAME_LAST; ref < GST_VP9_REF_FRAME_MAX; ++ref) {
for (mode = 0; mode < GST_VP9_MAX_MODE_LF_DELTAS; ++mode) {
const int inter_filter = filter + priv->ref_deltas[ref] * scale
+ priv->mode_deltas[mode] * scale;
seg->filter_level[ref][mode] =
CLAMP (inter_filter, 0, GST_VP9_MAX_LOOP_FILTER);
}
}
}
}
seg->reference_frame_enabled = info->reference_frame_enabled;;
seg->reference_frame = info->reference_frame;
seg->reference_skip = info->reference_skip;
}
}
static void
reference_update (GstVp9Parser * parser, const GstVp9FrameHdr * const frame_hdr)
{
guint8 flag = 1;
guint8 refresh_frame_flags;
int i;
GstVp9ParserPrivate *priv = GST_VP9_PARSER_GET_PRIVATE (parser);
ReferenceSize *reference = priv->reference;
if (frame_hdr->frame_type == GST_VP9_KEY_FRAME) {
refresh_frame_flags = 0xff;
} else {
refresh_frame_flags = frame_hdr->refresh_frame_flags;
}
for (i = 0; i < GST_VP9_REF_FRAMES; i++) {
if (refresh_frame_flags & flag) {
reference[i].width = frame_hdr->width;
reference[i].height = frame_hdr->height;
}
flag <<= 1;
}
}
static inline int
frame_is_intra_only (const GstVp9FrameHdr * frame_hdr)
{
return frame_hdr->frame_type == GST_VP9_KEY_FRAME || frame_hdr->intra_only;
}
static void
set_default_lf_deltas (GstVp9Parser * parser)
{
GstVp9ParserPrivate *priv = GST_VP9_PARSER_GET_PRIVATE (parser);
priv->ref_deltas[GST_VP9_REF_FRAME_INTRA] = 1;
priv->ref_deltas[GST_VP9_REF_FRAME_LAST] = 0;
priv->ref_deltas[GST_VP9_REF_FRAME_GOLDEN] = -1;
priv->ref_deltas[GST_VP9_REF_FRAME_ALTREF] = -1;
priv->mode_deltas[0] = 0;
priv->mode_deltas[1] = 0;
}
static void
set_default_segmentation_info (GstVp9Parser * parser)
{
GstVp9ParserPrivate *priv = GST_VP9_PARSER_GET_PRIVATE (parser);
memset (priv->segmentation, 0, sizeof (priv->segmentation));
priv->segmentation_abs_delta = FALSE;
}
static void
setup_past_independence (GstVp9Parser * parser,
GstVp9FrameHdr * const frame_hdr)
{
set_default_lf_deltas (parser);
set_default_segmentation_info (parser);
memset (frame_hdr->ref_frame_sign_bias, 0,
sizeof (frame_hdr->ref_frame_sign_bias));
}
static void
gst_vp9_parser_reset (GstVp9Parser * parser)
{
GstVp9ParserPrivate *priv = parser->priv;
parser->priv = NULL;
memset (parser->mb_segment_tree_probs, 0,
sizeof (parser->mb_segment_tree_probs));
memset (parser->segment_pred_probs, 0, sizeof (parser->segment_pred_probs));
memset (parser->segmentation, 0, sizeof (parser->segmentation));
memset (priv, 0, sizeof (GstVp9ParserPrivate));
parser->priv = priv;
}
static GstVp9ParserResult
gst_vp9_parser_update (GstVp9Parser * parser, GstVp9FrameHdr * const frame_hdr)
{
if (frame_hdr->frame_type == GST_VP9_KEY_FRAME)
gst_vp9_parser_reset (parser);
if (frame_is_intra_only (frame_hdr) || frame_hdr->error_resilient_mode)
setup_past_independence (parser, frame_hdr);
loop_filter_update (parser, &frame_hdr->loopfilter);
segmentation_update (parser, frame_hdr);
reference_update (parser, frame_hdr);
return GST_VP9_PARSER_OK;
}
/******** API *************/
/**
* gst_vp9_parser_new:
*
* Creates a new #GstVp9Parser. It should be freed with
* gst_vp9_parser_free() after use.
*
* Returns: a new #GstVp9Parser
*
* Since: 1.8
*/
GstVp9Parser *
gst_vp9_parser_new (void)
{
GstVp9Parser *parser;
GstVp9ParserPrivate *priv;
INITIALIZE_DEBUG_CATEGORY;
GST_DEBUG ("Create VP9 Parser");
parser = g_slice_new0 (GstVp9Parser);
if (!parser)
return NULL;
priv = g_slice_new0 (GstVp9ParserPrivate);
if (!priv)
return NULL;
parser->priv = priv;
return parser;
}
/**
* gst_vp9_parser_free:
* @parser: the #GstVp9Parser to free
*
* Frees @parser.
*
* Since: 1.8
*/
void
gst_vp9_parser_free (GstVp9Parser * parser)
{
if (parser) {
if (parser->priv) {
g_slice_free (GstVp9ParserPrivate, parser->priv);
parser->priv = NULL;
}
g_slice_free (GstVp9Parser, parser);
}
}
/**
* gst_vp9_parser_parse_frame_header:
* @parser: The #GstVp9Parser
* @frame_hdr: The #GstVp9FrameHdr to fill
* @data: The data to parse
* @size: The size of the @data to parse
*
* Parses the VP9 bitstream contained in @data, and fills in @frame_hdr
* with the information. The @size argument represent the whole frame size.
*
* Returns: a #GstVp9ParserResult
*
* Since: 1.8
*/
GstVp9ParserResult
gst_vp9_parser_parse_frame_header (GstVp9Parser * parser,
GstVp9FrameHdr * frame_hdr, const guint8 * data, gsize size)
{
GstBitReader bit_reader;
GstBitReader *br = &bit_reader;
gst_bit_reader_init (br, data, size);
memset (frame_hdr, 0, sizeof (*frame_hdr));
/* Parsing Uncompressed Data Chunk */
if (!verify_frame_marker (br))
goto error;
frame_hdr->profile = parse_profile (br);
if (frame_hdr->profile > GST_VP9_PROFILE_UNDEFINED) {
GST_ERROR ("Stream has undefined VP9 profile !");
goto error;
}
frame_hdr->show_existing_frame = gst_vp9_read_bit (br);
if (frame_hdr->show_existing_frame) {
frame_hdr->frame_to_show = gst_vp9_read_bits (br, GST_VP9_REF_FRAMES_LOG2);
return GST_VP9_PARSER_OK;
}
frame_hdr->frame_type = gst_vp9_read_bit (br);
frame_hdr->show_frame = gst_vp9_read_bit (br);
frame_hdr->error_resilient_mode = gst_vp9_read_bit (br);
if (frame_hdr->frame_type == GST_VP9_KEY_FRAME) {
if (!verify_sync_code (br)) {
GST_ERROR ("Invalid VP9 Key-frame sync code !");
goto error;
}
if (!parse_bitdepth_colorspace_sampling (parser, br, frame_hdr)) {
GST_ERROR ("Failed to parse color_space/bit_depth info !");
goto error;
}
parse_frame_size (br, &frame_hdr->width, &frame_hdr->height);
parse_display_frame_size (br, frame_hdr);
} else {
frame_hdr->intra_only = frame_hdr->show_frame ? 0 : gst_vp9_read_bit (br);
frame_hdr->reset_frame_context = frame_hdr->error_resilient_mode ?
0 : gst_vp9_read_bits (br, 2);
if (frame_hdr->intra_only) {
if (!verify_sync_code (br)) {
GST_ERROR ("Invalid VP9 sync code in intra-only frame !");
goto error;
}
if (frame_hdr->profile > GST_VP9_PROFILE_0) {
if (!parse_bitdepth_colorspace_sampling (parser, br, frame_hdr)) {
GST_ERROR ("Failed to parse color_space/bit_depth info !");
goto error;
}
} else {
parser->color_space = GST_VP9_CS_BT_601;
parser->color_range = GST_VP9_CR_LIMITED;
parser->subsampling_y = parser->subsampling_x = 1;
parser->bit_depth = GST_VP9_BIT_DEPTH_8;
}
frame_hdr->refresh_frame_flags =
gst_vp9_read_bits (br, GST_VP9_REF_FRAMES);
parse_frame_size (br, &frame_hdr->width, &frame_hdr->height);
parse_display_frame_size (br, frame_hdr);
} else {
int i;
frame_hdr->refresh_frame_flags =
gst_vp9_read_bits (br, GST_VP9_REF_FRAMES);
for (i = 0; i < GST_VP9_REFS_PER_FRAME; i++) {
frame_hdr->ref_frame_indices[i] =
gst_vp9_read_bits (br, GST_VP9_REF_FRAMES_LOG2);
frame_hdr->ref_frame_sign_bias[i] = gst_vp9_read_bit (br);
}
parse_frame_size_from_refs (parser, frame_hdr, br);
parse_display_frame_size (br, frame_hdr);
frame_hdr->allow_high_precision_mv = gst_vp9_read_bit (br);
frame_hdr->mcomp_filter_type = parse_interp_filter (br);
}
}
frame_hdr->refresh_frame_context =
frame_hdr->error_resilient_mode ? 0 : gst_vp9_read_bit (br);
frame_hdr->frame_parallel_decoding_mode =
frame_hdr->error_resilient_mode ? 1 : gst_vp9_read_bit (br);
frame_hdr->frame_context_idx =
gst_vp9_read_bits (br, GST_VP9_FRAME_CONTEXTS_LOG2);
/* loopfilter header */
parse_loopfilter (&frame_hdr->loopfilter, br);
/* quantization header */
parse_quantization (&frame_hdr->quant_indices, br);
/* set lossless_flag */
frame_hdr->lossless_flag = frame_hdr->quant_indices.y_ac_qi == 0 &&
frame_hdr->quant_indices.y_dc_delta == 0 &&
frame_hdr->quant_indices.uv_dc_delta == 0
&& frame_hdr->quant_indices.uv_ac_delta == 0;
/* segmentation header */
parse_segmentation (&frame_hdr->segmentation, br);
/* tile header */
if (!parse_tile_info (frame_hdr, br)) {
GST_ERROR ("Failed to parse tile info...!");
goto error;
}
/* size of the rest of the header */
frame_hdr->first_partition_size = gst_vp9_read_bits (br, 16);
if (!frame_hdr->first_partition_size) {
GST_ERROR ("Failed to parse the first partition size...!");
goto error;
}
frame_hdr->frame_header_length_in_bytes =
(gst_bit_reader_get_pos (br) + 7) / 8;
return gst_vp9_parser_update (parser, frame_hdr);
error:
return GST_VP9_PARSER_ERROR;
}