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gstreamer/gst-libs/gst/codecparsers/gstvc1parser.c
Thibault Saunier 705a80d957 codecparser: VC1: Implement a VC1 parsing library
2011-09-26 08:46:37 -03:00

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/* Gstreamer
* Copyright (C) <2011> Intel
* Copyright (C) <2011> Collabora Ltd.
* Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstvc1parser
* @short_description: Convenience library for parsing vc1 video
* bitstream.
*
* For more details about the structures, look at the
* smpte specifications (S421m-2006.pdf).
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstvc1parser.h"
#include <gst/base/gstbytereader.h>
#include <gst/base/gstbitreader.h>
#include <string.h>
#ifndef GST_DISABLE_GST_DEBUG
#define GST_CAT_DEFAULT ensure_debug_category()
static GstDebugCategory *
ensure_debug_category (void)
{
static gsize cat_gonce = 0;
if (g_once_init_enter (&cat_gonce)) {
gsize cat_done;
cat_done = (gsize) _gst_debug_category_new ("codecparsers_vc1", 0,
"VC1 codec parsing library");
g_once_init_leave (&cat_gonce, cat_done);
}
return (GstDebugCategory *) cat_gonce;
}
#else
#define ensure_debug_category() /* NOOP */
#endif /* GST_DISABLE_GST_DEBUG */
/* ------------------------------------------------------------------------- */
#define GET_BITS(b, num, bits) G_STMT_START { \
if (!gst_bit_reader_get_bits_uint32(b, bits, num)) \
goto failed; \
GST_TRACE ("parsed %d bits: %d", num, *(bits)); \
} G_STMT_END
#define READ_UINT8(br, val, nbits) G_STMT_START { \
if (!gst_bit_reader_get_bits_uint8 (br, &val, nbits)) { \
GST_WARNING ("failed to read uint8, nbits: %d", nbits); \
goto failed; \
} \
} G_STMT_END
#define READ_UINT16(br, val, nbits) G_STMT_START { \
if (!gst_bit_reader_get_bits_uint16 (br, &val, nbits)) { \
GST_WARNING ("failed to read uint16, nbits: %d", nbits); \
goto failed; \
} \
} G_STMT_END
#define READ_UINT32(br, val, nbits) G_STMT_START { \
if (!gst_bit_reader_get_bits_uint32 (br, &val, nbits)) { \
GST_WARNING ("failed to read uint32, nbits: %d", nbits); \
goto failed; \
} \
} G_STMT_END
#define SKIP(br, nbits) G_STMT_START { \
if (!gst_bit_reader_skip (br, nbits)) { \
GST_WARNING ("Failed to skip nbits: %d", nbits); \
goto failed; \
} \
} G_STMT_END
const guint8 vc1_pquant_table[3][32] = {
{ /* Implicit quantizer */
0, 1, 2, 3, 4, 5, 6, 7, 8, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31},
{ /* Explicit quantizer, pquantizer uniform */
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31},
{ /* Explicit quantizer, pquantizer non-uniform */
0, 1, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31}
};
const guint8 mvmode_table[2][5] = {
{
GST_VC1_MVMODE_1MV_HPEL_BILINEAR,
GST_VC1_MVMODE_1MV,
GST_VC1_MVMODE_1MV_HPEL,
GST_VC1_MVMODE_MIXED_MV,
GST_VC1_MVMODE_INTENSITY_COMP},
{
GST_VC1_MVMODE_1MV,
GST_VC1_MVMODE_MIXED_MV,
GST_VC1_MVMODE_1MV_HPEL,
GST_VC1_MVMODE_INTENSITY_COMP,
GST_VC1_MVMODE_1MV_HPEL_BILINEAR}
};
const guint8 mvmode2_table[2][4] = {
{
GST_VC1_MVMODE_1MV_HPEL_BILINEAR,
GST_VC1_MVMODE_1MV,
GST_VC1_MVMODE_1MV_HPEL,
GST_VC1_MVMODE_MIXED_MV},
{
GST_VC1_MVMODE_1MV,
GST_VC1_MVMODE_MIXED_MV,
GST_VC1_MVMODE_1MV_HPEL,
GST_VC1_MVMODE_1MV_HPEL_BILINEAR}
};
static const guint bfraction_vlc_table[] = {
0x00, 3, 128,
0x01, 3, 85,
0x02, 3, 170,
0x03, 3, 64,
0x04, 3, 192,
0x05, 3, 51,
0x06, 3, 102,
0x70, 3, 153,
0x71, 7, 204,
0x72, 7, 43,
0x73, 7, 215,
0x74, 7, 37,
0x75, 7, 74,
0x76, 7, 111,
0x77, 7, 148,
0x78, 7, 185,
0x79, 7, 222,
0x7a, 7, 32,
0x7b, 7, 96,
0x7c, 7, 160,
0x7d, 7, 224,
0x7e, 7, 0, /* Indicate sthat it is smtpe reserved */
0x7f, 7, GST_VC1_PICTURE_TYPE_BI
};
/* Imode types */
enum
{
IMODE_RAW,
IMODE_NORM2,
IMODE_DIFF2,
IMODE_NORM6,
IMODE_DIFF6,
IMODE_ROWSKIP,
IMODE_COLSKIP
};
static const guint imode_vlc_table[] = {
0x02, 2, IMODE_NORM2, /* 10 */
0x03, 2, IMODE_NORM6, /* 11 */
0x02, 3, IMODE_ROWSKIP, /* 010 */
0x03, 3, IMODE_COLSKIP, /* 011 */
0x01, 3, IMODE_DIFF2, /* 001 */
0x01, 4, IMODE_DIFF6, /* 0001 */
0x00, 4, IMODE_RAW /* 0000 */
};
const guint vc1_norm2_codes_vlc_table[] = {
0x00, 1, 1,
0x03, 2, 3,
0x04, 3, 3,
0x05, 3, 2
};
const guint norm6_vlc_table[256] = {
0x001, 1, 0,
0x002, 4, 0,
0x003, 4, 0,
0x004, 4, 0,
0x005, 4, 0,
0x006, 4, 0,
0x007, 4, 0,
0x007, 6, 0,
0x000, 8, 0,
0x001, 8, 0,
0x002, 8, 0,
0x003, 8, 0,
0x004, 8, 0,
0x005, 8, 0,
0x006, 8, 0,
0x007, 8, 0,
0x008, 8, 0,
0x009, 8, 0,
0x00A, 8, 0,
0x00B, 8, 0,
0x00C, 8, 0,
0x00D, 8, 0,
0x00E, 8, 0,
0x037, 9, 0,
0x036, 9, 0,
0x035, 9, 0,
0x034, 9, 0,
0x033, 9, 0,
0x032, 9, 0,
0x047, 10, 0,
0x04B, 10, 0,
0x04D, 10, 0,
0x04E, 10, 0,
0x30E, 13, 0,
0x053, 10, 0,
0x055, 10, 0,
0x056, 10, 0,
0x30D, 13, 0,
0x059, 10, 0,
0x05A, 10, 0,
0x30C, 13, 0,
0x05C, 10, 0,
0x30B, 13, 0,
0x30A, 13, 0,
0x043, 10, 0,
0x045, 10, 0,
0x046, 10, 0,
0x309, 13, 0,
0x049, 10, 0,
0x04A, 10, 0,
0x308, 13, 0,
0x04C, 10, 0,
0x307, 13, 0,
0x306, 13, 0,
0x051, 10, 0,
0x052, 10, 0,
0x305, 13, 0,
0x054, 10, 0,
0x304, 13, 0,
0x303, 13, 0,
0x058, 10, 0,
0x302, 13, 0,
0x301, 13, 0,
0x300, 13, 0
};
static inline guint8
decode_colskip (GstBitReader * br, guint width, guint height)
{
guint i;
guint8 colskip;
GST_DEBUG ("Colskip rowskip");
for (i = 0; i < height; i++) {
READ_UINT8 (br, colskip, 1);
if (colskip)
SKIP (br, width);
}
return 1;
failed:
GST_WARNING ("Failed to parse colskip");
return 0;
}
static inline guint8
decode_rowskip (GstBitReader * br, guint width, guint height)
{
guint i;
guint8 rowskip;
GST_DEBUG ("Parsing rowskip");
for (i = 0; i < height; i++) {
READ_UINT8 (br, rowskip, 1);
if (rowskip)
SKIP (br, width);
}
return 1;
failed:
GST_WARNING ("Failed to parse rowskip");
return 0;
}
static inline gint8
decode012 (GstBitReader * br)
{
guint8 n;
READ_UINT8 (br, n, 1);
if (n == 0)
return 0;
READ_UINT8 (br, n, 1);
return n + 1;
failed:
GST_WARNING ("Could not decode 0 1 2 returning -1");
return -1;
}
static inline guint
calculate_nb_pan_scan_win (GstVC1AdvancedSeqHdr * advseqhdr,
GstVC1PicAdvanced * pic)
{
if (advseqhdr->interlace && !advseqhdr->psf) {
if (advseqhdr->pulldown)
return pic->rff + 2;
return 2;
} else {
if (advseqhdr->pulldown)
return pic->rptfrm + 1;
return 1;
}
}
/**
* table should look like:
* {Value, nbBits, Meaning,
* ...
* } nbBits must be increasing
*/
static gboolean
decode_vlc (GstBitReader * br, guint * res, const guint * table, guint length)
{
guint8 i;
guint cbits = 0;
guint32 value = 0;
for (i = 0; i < length; i += 3) {
if (cbits != table[i + 1]) {
cbits = table[i + 1];
if (!gst_bit_reader_peek_bits_uint32 (br, &value, cbits)) {
goto failed;
}
}
if (value == table[i]) {
SKIP (br, cbits);
if (res)
*res = table[i + 2];
return TRUE;
}
}
failed:
{
GST_DEBUG ("Could not decode VLC returning -1");
return FALSE;
}
}
/*** bitplane decoding ***/
static gint
bitplane_decoding (GstBitReader * br, guint height,
guint width, guint8 * is_raw)
{
guint imode;
guint i, j, offset = 0;
SKIP (br, 1);
if (!decode_vlc (br, &imode, imode_vlc_table, G_N_ELEMENTS (imode_vlc_table)))
goto failed;
switch (imode) {
case IMODE_RAW:
GST_DEBUG ("Parsing IMODE_RAW");
*is_raw = TRUE;
return TRUE;
case IMODE_DIFF2:
case IMODE_NORM2:
GST_DEBUG ("Parsing IMODE_DIFF2 or IMODE_NORM2 biplane");
if ((height * width) & 1) {
SKIP (br, 1);
}
for (i = offset; i < height * width; i += 2) {
/*guint x; */
if (!decode_vlc (br, NULL, vc1_norm2_codes_vlc_table,
G_N_ELEMENTS (vc1_norm2_codes_vlc_table))) {
goto failed;
}
}
break;
case IMODE_DIFF6:
case IMODE_NORM6:
GST_DEBUG ("Parsing IMODE_DIFF6 or IMODE_NORM6 biplane");
if (!(height % 3) && (width % 3)) { // use 2x3 decoding
for (i = 0; i < height; i += 3) {
for (j = width & 1; j < width; j += 2) {
if (!decode_vlc (br, NULL, norm6_vlc_table,
G_N_ELEMENTS (norm6_vlc_table))) {
goto failed;
}
}
}
} else {
for (i = height & 1; i < height; i += 2) {
for (j = width % 3; j < width; j += 3) {
if (!decode_vlc (br, NULL, norm6_vlc_table,
G_N_ELEMENTS (norm6_vlc_table))) {
goto failed;
}
}
}
j = width % 3;
if (j)
decode_colskip (br, height, width);
if (height & 1)
decode_rowskip (br, height, width);
}
break;
case IMODE_ROWSKIP:
GST_DEBUG ("Parsing IMODE_ROWSKIP biplane");
if (!decode_rowskip (br, width, height))
goto failed;
break;
case IMODE_COLSKIP:
GST_DEBUG ("Parsing IMODE_COLSKIP biplane");
if (decode_colskip (br, width, height))
goto failed;
break;
}
return TRUE;
failed:
GST_WARNING ("Failed to decode bitplane");
return FALSE;
}
static gboolean
parse_vopdquant (GstBitReader * br, GstVC1FrameHdr * framehdr, guint8 dquant)
{
GstVC1VopDquant *vopdquant = &framehdr->vopdquant;
GST_DEBUG ("Parsing vopdquant");
vopdquant->dqbilevel = 0;
if (dquant == 2) {
READ_UINT8 (br, vopdquant->dquantfrm, 1);
READ_UINT8 (br, vopdquant->pqdiff, 3);
if (vopdquant->pqdiff == 7)
READ_UINT8 (br, vopdquant->abspq, 5);
else
vopdquant->abspq = framehdr->pquant + vopdquant->pqdiff + 1;
} else {
READ_UINT8 (br, vopdquant->dquantfrm, 1);
GST_DEBUG (" %u DquantFrm %u", gst_bit_reader_get_pos (br),
vopdquant->dquantfrm);
if (vopdquant->dquantfrm) {
READ_UINT8 (br, vopdquant->dqprofile, 1);
switch (vopdquant->dqprofile) {
case GST_VC1_DQPROFILE_SINGLE_EDGE:
case GST_VC1_DQPROFILE_DOUBLE_EDGES:
READ_UINT8 (br, vopdquant->dqsbedge, 2);
break;
case GST_VC1_DQPROFILE_ALL_MBS:
READ_UINT8 (br, vopdquant->dqbilevel, 1);
break;
}
if (vopdquant->dqbilevel
|| vopdquant->dqprofile != GST_VC1_DQPROFILE_ALL_MBS) {
{
READ_UINT8 (br, vopdquant->pqdiff, 3);
if (vopdquant->pqdiff == 7)
READ_UINT8 (br, vopdquant->abspq, 5);
}
}
}
}
return TRUE;
failed:
GST_WARNING ("Failed to parse vopdquant");
return FALSE;
}
static inline gint
scan_for_start_codes (const guint8 * data, guint size)
{
GstByteReader br;
gst_byte_reader_init (&br, data, size);
/* NALU not empty, so we can at least expect 1 (even 2) bytes following sc */
return gst_byte_reader_masked_scan_uint32 (&br, 0xffffff00, 0x00000100,
0, size);
}
static inline gint
get_unary (GstBitReader * br, gint stop, gint len)
{
int i;
guint8 current = 0xff;
for (i = 0; i < len; i++) {
gst_bit_reader_get_bits_uint8 (br, &current, 1);
if (current == stop)
return i;
}
return i;
}
static GstVC1ParseResult
parse_hrd_param_flag (GstBitReader * br, GstVC1HrdParam * hrd_param)
{
guint i;
GST_DEBUG ("Parsing Hrd param flag");
if (gst_bit_reader_get_remaining (br) < 13)
goto failed;
hrd_param->hrd_num_leaky_buckets =
gst_bit_reader_get_bits_uint8_unchecked (br, 5);
hrd_param->bit_rate_exponent =
gst_bit_reader_get_bits_uint8_unchecked (br, 4);
hrd_param->buffer_size_exponent =
gst_bit_reader_get_bits_uint8_unchecked (br, 4);
if (gst_bit_reader_get_remaining (br) <
(32 * hrd_param->hrd_num_leaky_buckets))
goto failed;
for (i = 0; i < hrd_param->hrd_num_leaky_buckets; i++) {
hrd_param->hrd_rate[i] = gst_bit_reader_get_bits_uint16_unchecked (br, 16);
hrd_param->hrd_buffer[i] =
gst_bit_reader_get_bits_uint16_unchecked (br, 16);
}
return GST_VC1_PARSER_OK;
failed:
GST_WARNING ("Failed to parse hrd param flag");
return GST_VC1_PARSER_ERROR;
}
static GstVC1ParseResult
parse_sequence_header_advanced (GstVC1SeqHdr * seqhdr, GstBitReader * br)
{
GstVC1AdvancedSeqHdr *advanced = &seqhdr->profile.advanced;
GST_DEBUG ("Parsing sequence header in advanced mode");
READ_UINT8 (br, advanced->level, 3);
READ_UINT8 (br, seqhdr->colordiff_format, 2);
READ_UINT8 (br, seqhdr->frmrtq_postproc, 3);
READ_UINT8 (br, seqhdr->bitrtq_postproc, 5);
GST_DEBUG ("level %u, colordiff_format %u , frmrtq_postproc %u,"
" bitrtq_postproc %u", advanced->level, seqhdr->colordiff_format,
seqhdr->frmrtq_postproc, seqhdr->bitrtq_postproc);
/* Calulate bitrate and framerate */
if (seqhdr->frmrtq_postproc == 0 && seqhdr->bitrtq_postproc == 30) {
seqhdr->framerate = 0;
seqhdr->bitrate = 0;
} else if (seqhdr->frmrtq_postproc == 0 && seqhdr->bitrtq_postproc == 30) {
seqhdr->framerate = 2;
seqhdr->bitrate = 1952;
} else if (seqhdr->frmrtq_postproc == 0 && seqhdr->bitrtq_postproc == 31) {
seqhdr->framerate = 6;
seqhdr->bitrate = 2016;
} else {
if (seqhdr->frmrtq_postproc == 7) {
seqhdr->framerate = 30;
} else {
seqhdr->framerate = 2 + (seqhdr->frmrtq_postproc * 4);
}
if (seqhdr->bitrtq_postproc == 31) {
seqhdr->bitrate = 2016;
} else {
seqhdr->bitrate = 32 + (seqhdr->bitrtq_postproc * 64);
}
}
if (gst_bit_reader_get_remaining (br) < 32)
goto failed;
advanced->postprocflag = gst_bit_reader_get_bits_uint8_unchecked (br, 1);
advanced->max_coded_width = gst_bit_reader_get_bits_uint16_unchecked (br, 12);
advanced->max_coded_height =
gst_bit_reader_get_bits_uint16_unchecked (br, 12);
advanced->max_coded_width = (advanced->max_coded_width + 1) << 1;
advanced->max_coded_height = (advanced->max_coded_height + 1) << 1;
advanced->pulldown = gst_bit_reader_get_bits_uint8_unchecked (br, 1);
advanced->interlace = gst_bit_reader_get_bits_uint8_unchecked (br, 1);
advanced->tfcntrflag = gst_bit_reader_get_bits_uint8_unchecked (br, 1);
seqhdr->finterpflag = gst_bit_reader_get_bits_uint8_unchecked (br, 1);
GST_DEBUG ("postprocflag %u, max_coded_width %u, max_coded_height %u,"
"pulldown %u, interlace %u, tfcntrflag %u, finterpflag %u",
advanced->postprocflag, advanced->max_coded_width,
advanced->max_coded_height, advanced->pulldown,
advanced->interlace, advanced->tfcntrflag, seqhdr->finterpflag);
/* Skipping reserved bit */
gst_bit_reader_skip_unchecked (br, 1);
advanced->psf = gst_bit_reader_get_bits_uint8_unchecked (br, 1);
advanced->display_ext = gst_bit_reader_get_bits_uint8_unchecked (br, 1);
if (advanced->display_ext) {
READ_UINT16 (br, advanced->disp_horiz_size, 14);
READ_UINT16 (br, advanced->disp_vert_size, 14);
advanced->disp_horiz_size++;
advanced->disp_vert_size++;
READ_UINT8 (br, advanced->aspect_ratio_flag, 1);
if (advanced->aspect_ratio_flag) {
READ_UINT8 (br, advanced->aspect_ratio, 4);
if (advanced->aspect_ratio == 15) {
READ_UINT8 (br, advanced->aspect_horiz_size, 8);
READ_UINT8 (br, advanced->aspect_vert_size, 8);
}
}
READ_UINT8 (br, advanced->framerate_flag, 1);
if (advanced->framerate_flag) {
READ_UINT8 (br, advanced->framerateind, 1);
if (!advanced->framerateind) {
READ_UINT8 (br, advanced->frameratenr, 8);
READ_UINT8 (br, advanced->frameratedr, 4);
} else {
READ_UINT16 (br, advanced->framerateexp, 16);
}
}
READ_UINT8 (br, advanced->color_format_flag, 1);
if (advanced->color_format_flag) {
if (gst_bit_reader_get_remaining (br) < 24)
goto failed;
advanced->color_prim = gst_bit_reader_get_bits_uint8_unchecked (br, 8);
advanced->transfer_char = gst_bit_reader_get_bits_uint8_unchecked (br, 8);
advanced->matrix_coef = gst_bit_reader_get_bits_uint8_unchecked (br, 8);
}
}
READ_UINT8 (br, advanced->hrd_param_flag, 1);
if (advanced->hrd_param_flag)
return parse_hrd_param_flag (br, &advanced->hrd_param);
return GST_VC1_PARSER_OK;
failed:
GST_WARNING ("Failed to parse advanced headers");
return GST_VC1_PARSER_ERROR;
}
static GstVC1ParseResult
parse_frame_header_advanced (GstBitReader * br, GstVC1FrameHdr * framehdr,
GstVC1SeqHdr * seqhdr)
{
GstVC1AdvancedSeqHdr *advhdr = &seqhdr->profile.advanced;
GstVC1PicAdvanced *pic = &framehdr->pic.advanced;
GstVC1EntryPointHdr *entrypthdr = &advhdr->entrypoint;
guint8 mvmodeidx;
guint width = (entrypthdr->coded_width + 15) >> 4;
guint height = (entrypthdr->coded_height + 15) >> 4;
GST_DEBUG ("Parsing Frame header advanced %u", advhdr->interlace);
/* Set the conveninence fields */
framehdr->profile = seqhdr->profiletype;
framehdr->dquant = entrypthdr->dquant;
if (advhdr->interlace) {
gint8 fcm = decode012 (br);
if (fcm < 0)
goto failed;
pic->fcm = (guint8) fcm;
}
framehdr->ptype = get_unary (br, 0, 4);
if (framehdr->ptype == GST_VC1_PICTURE_TYPE_SKIPPED)
goto failed;
if (advhdr->tfcntrflag) {
READ_UINT8 (br, pic->tfcntr, 8);
GST_DEBUG ("tfcntr %u", pic->tfcntr);
}
if (advhdr->pulldown) {
if (!advhdr->interlace || advhdr->psf) {
READ_UINT8 (br, pic->rptfrm, 2);
GST_DEBUG ("rptfrm %u", pic->rptfrm);
} else {
READ_UINT8 (br, pic->tff, 1);
READ_UINT8 (br, pic->rff, 1);
GST_DEBUG ("tff %u, rff %u", pic->tff, pic->rff);
}
}
if (entrypthdr->panscan_flag) {
READ_UINT8 (br, pic->ps_present, 1);
if (pic->ps_present) {
guint i, nb_pan_scan_win = calculate_nb_pan_scan_win (advhdr, pic);
if (gst_bit_reader_get_remaining (br) < 64 * nb_pan_scan_win)
goto failed;
for (i = 0; i < nb_pan_scan_win; i++) {
pic->ps_hoffset = gst_bit_reader_get_bits_uint32_unchecked (br, 18);
pic->ps_voffset = gst_bit_reader_get_bits_uint32_unchecked (br, 18);
pic->ps_width = gst_bit_reader_get_bits_uint16_unchecked (br, 14);
pic->ps_height = gst_bit_reader_get_bits_uint16_unchecked (br, 14);
}
}
}
READ_UINT8 (br, pic->rndctrl, 1);
if (advhdr->interlace) {
READ_UINT8 (br, pic->uvsamp, 1);
GST_DEBUG ("uvsamp %u", pic->uvsamp);
}
if (seqhdr->finterpflag) {
READ_UINT8 (br, framehdr->interpfrm, 1);
GST_DEBUG ("interpfrm %u", framehdr->interpfrm);
}
if (framehdr->ptype == GST_VC1_PICTURE_TYPE_B) {
if (!decode_vlc (br, (guint *) & pic->bfraction, bfraction_vlc_table,
G_N_ELEMENTS (bfraction_vlc_table)))
goto failed;
GST_DEBUG ("bfraction %u", pic->bfraction);
if (pic->bfraction == GST_VC1_PICTURE_TYPE_BI) {
framehdr->ptype = GST_VC1_PICTURE_TYPE_BI;
}
}
READ_UINT8 (br, framehdr->pqindex, 5);
if (!framehdr->pqindex)
goto failed;
/* compute pquant */
if (entrypthdr->quantizer == GST_VC1_QUANTIZER_IMPLICITLY)
framehdr->pquant = vc1_pquant_table[0][framehdr->pqindex];
else
framehdr->pquant = vc1_pquant_table[1][framehdr->pqindex];
framehdr->pquantizer = 1;
if (entrypthdr->quantizer == GST_VC1_QUANTIZER_IMPLICITLY)
framehdr->pquantizer = framehdr->pqindex < 9;
if (entrypthdr->quantizer == GST_VC1_QUANTIZER_NON_UNIFORM)
framehdr->pquantizer = 0;
if (framehdr->pqindex <= 8)
READ_UINT8 (br, framehdr->halfqp, 1);
else
framehdr->halfqp = 0;
if (entrypthdr->quantizer == GST_VC1_QUANTIZER_EXPLICITLY) {
READ_UINT8 (br, framehdr->pquantizer, 1);
}
if (advhdr->postprocflag)
READ_UINT8 (br, pic->postproc, 2);
GST_DEBUG ("Parsing %u picture, pqindex %u, pquant %u pquantizer %u"
"halfqp %u", framehdr->ptype, framehdr->pqindex, framehdr->pquant,
framehdr->pquantizer, framehdr->halfqp);
switch (framehdr->ptype) {
case GST_VC1_PICTURE_TYPE_I:
case GST_VC1_PICTURE_TYPE_BI:
if (!bitplane_decoding (br, height, width, &pic->acpred))
goto failed;
if (entrypthdr->overlap && framehdr->pquant <= 8) {
pic->condover = decode012 (br);
if (pic->condover == (guint8) - 1)
goto failed;
else if (pic->condover == GST_VC1_CONDOVER_SELECT) {
if (!bitplane_decoding (br, height, width, &pic->overflags))
goto failed;
GST_DEBUG ("overflags %u", pic->overflags);
}
}
framehdr->transacfrm = get_unary (br, 0, 2);
pic->transacfrm2 = get_unary (br, 0, 2);
READ_UINT8 (br, framehdr->transdctab, 1);
if (framehdr->dquant)
parse_vopdquant (br, framehdr, framehdr->dquant);
GST_DEBUG ("acpred %u, condover %u transacfrm %u transacfrm2 %u,",
pic->acpred, pic->condover, framehdr->transacfrm, pic->transacfrm2);
break;
case GST_VC1_PICTURE_TYPE_B:
if (entrypthdr->extended_mv)
pic->mvrange = get_unary (br, 0, 3);
else
pic->mvrange = 0;
READ_UINT8 (br, pic->mvmode, 1);
if (!bitplane_decoding (br, height, width, &pic->directmb))
goto failed;
if (!bitplane_decoding (br, height, width, &pic->skipmb))
goto failed;
READ_UINT8 (br, pic->mvtab, 2);
READ_UINT8 (br, pic->cbptab, 2);
if (framehdr->dquant) {
parse_vopdquant (br, framehdr, framehdr->dquant);
}
if (entrypthdr->vstransform) {
READ_UINT8 (br, pic->ttmbf, 1);
if (pic->ttmbf) {
READ_UINT8 (br, pic->ttfrm, 2);
}
}
framehdr->transacfrm = get_unary (br, 0, 2);
READ_UINT8 (br, framehdr->transdctab, 1);
GST_DEBUG ("transacfrm %u transdctab %u mvmode %u mvtab %u,"
"cbptab %u directmb %u skipmb %u", framehdr->transacfrm,
framehdr->transdctab, pic->mvmode, pic->mvtab, pic->cbptab,
pic->directmb, pic->skipmb);
break;
case GST_VC1_PICTURE_TYPE_P:
if (entrypthdr->extended_mv)
pic->mvrange = get_unary (br, 0, 3);
else
pic->mvrange = 0;
mvmodeidx = framehdr->pquant > 12 ? 0 : 1;
pic->mvmode = mvmode_table[mvmodeidx][get_unary (br, 1, 4)];
if (pic->mvmode == GST_VC1_MVMODE_INTENSITY_COMP) {
pic->mvmode2 = mvmode2_table[mvmodeidx][get_unary (br, 1, 4)];
READ_UINT8 (br, pic->lumscale, 6);
READ_UINT8 (br, pic->lumshift, 6);
GST_DEBUG ("lumscale %u lumshift %u", pic->lumscale, pic->lumshift);
}
if (pic->mvmode == GST_VC1_MVMODE_MIXED_MV ||
(pic->mvmode == GST_VC1_MVMODE_INTENSITY_COMP &&
pic->mvmode2 == GST_VC1_MVMODE_MIXED_MV)) {
if (!bitplane_decoding (br, height, width, &pic->mvtypemb))
goto failed;
GST_DEBUG ("mvtypemb %u", pic->mvtypemb);
}
if (!bitplane_decoding (br, height, width, &pic->skipmb) ||
gst_bit_reader_get_remaining (br) < 4)
goto failed;
pic->mvtab = gst_bit_reader_get_bits_uint8_unchecked (br, 2);
pic->cbptab = gst_bit_reader_get_bits_uint8_unchecked (br, 2);
if (framehdr->dquant) {
parse_vopdquant (br, framehdr, framehdr->dquant);
}
if (entrypthdr->vstransform) {
READ_UINT8 (br, pic->ttmbf, 1);
if (pic->ttmbf) {
READ_UINT8 (br, pic->ttfrm, 2);
}
}
framehdr->transacfrm = get_unary (br, 0, 2);
READ_UINT8 (br, framehdr->transdctab, 1);
GST_DEBUG ("transacfrm %u transdctab %u mvmode %u mvtab %u,"
"cbptab %u skipmb %u", framehdr->transacfrm, framehdr->transdctab,
pic->mvmode, pic->mvtab, pic->cbptab, pic->skipmb);
break;
}
return GST_VC1_PARSER_OK;
failed:
GST_WARNING ("Failed to parse frame header");
return GST_VC1_PARSER_ERROR;
}
static GstVC1ParseResult
parse_frame_header (GstBitReader * br, GstVC1FrameHdr * framehdr,
GstVC1SeqHdr * seqhdr)
{
guint8 mvmodeidx;
GstVC1PicSimpleMain *pic = &framehdr->pic.simple;
GstVC1SimpleMainSeqHdr *simplehdr = &seqhdr->profile.simplemain;
guint width = (simplehdr->coded_width + 15) >> 4;
guint height = (simplehdr->coded_height + 15) >> 4;
GST_DEBUG ("Parsing frame header in simple or main mode");
/* Set the conveninence fields */
framehdr->profile = seqhdr->profiletype;
framehdr->dquant = simplehdr->dquant;
framehdr->interpfrm = 0;
if (seqhdr->finterpflag)
READ_UINT8 (br, framehdr->interpfrm, 1);
READ_UINT8 (br, pic->frmcnt, 2);
pic->rangeredfrm = 0;
if (simplehdr->rangered) {
READ_UINT8 (br, pic->rangeredfrm, 2);
}
/* Figuring out the picture type */
READ_UINT8 (br, framehdr->ptype, 1);
if (simplehdr->maxbframes) {
if (!framehdr->ptype) {
READ_UINT8 (br, framehdr->ptype, 1);
if (framehdr->ptype)
framehdr->ptype = GST_VC1_PICTURE_TYPE_I;
else
framehdr->ptype = GST_VC1_PICTURE_TYPE_B;
} else
framehdr->ptype = GST_VC1_PICTURE_TYPE_P;
} else {
if (framehdr->ptype)
framehdr->ptype = GST_VC1_PICTURE_TYPE_P;
else
framehdr->ptype = GST_VC1_PICTURE_TYPE_I;
}
if (framehdr->ptype == GST_VC1_PICTURE_TYPE_B) {
if (!decode_vlc (br, (guint *) & pic->bfraction, bfraction_vlc_table,
G_N_ELEMENTS (bfraction_vlc_table)))
goto failed;
if (pic->bfraction == GST_VC1_PICTURE_TYPE_BI) {
framehdr->ptype = GST_VC1_PICTURE_TYPE_BI;
}
GST_DEBUG ("bfraction= %d", pic->bfraction);
}
if (framehdr->ptype == GST_VC1_PICTURE_TYPE_I ||
framehdr->ptype == GST_VC1_PICTURE_TYPE_BI)
READ_UINT8 (br, pic->bf, 7);
READ_UINT8 (br, framehdr->pqindex, 5);
if (!framehdr->pqindex)
return GST_VC1_PARSER_ERROR;
GST_DEBUG ("pqindex %u", framehdr->pqindex);
/* compute pquant */
if (simplehdr->quantizer == GST_VC1_QUANTIZER_IMPLICITLY)
framehdr->pquant = vc1_pquant_table[0][framehdr->pqindex];
else
framehdr->pquant = vc1_pquant_table[1][framehdr->pqindex];
GST_DEBUG ("pquant %u", framehdr->pquant);
if (framehdr->pqindex <= 8)
READ_UINT8 (br, framehdr->halfqp, 1);
else
framehdr->halfqp = 0;
/* Set pquantizer */
framehdr->pquantizer = 1;
if (simplehdr->quantizer == GST_VC1_QUANTIZER_IMPLICITLY)
framehdr->pquantizer = framehdr->pqindex < 9;
else if (simplehdr->quantizer == GST_VC1_QUANTIZER_NON_UNIFORM)
framehdr->pquantizer = 0;
if (simplehdr->quantizer == GST_VC1_QUANTIZER_EXPLICITLY)
READ_UINT8 (br, framehdr->pquantizer, 1);
if (simplehdr->extended_mv == 1) {
pic->mvrange = get_unary (br, 0, 3);
GST_DEBUG ("mvrange %u", pic->mvrange);
}
if (simplehdr->multires && (framehdr->ptype == GST_VC1_PICTURE_TYPE_P ||
framehdr->ptype == GST_VC1_PICTURE_TYPE_I)) {
READ_UINT8 (br, pic->respic, 2);
GST_DEBUG ("Respic %u", pic->respic);
}
GST_DEBUG ("Parsing %u Frame, pquantizer %u, halfqp %u, rangeredfrm %u, "
"interpfrm %u", framehdr->ptype, framehdr->pquantizer, framehdr->halfqp,
pic->rangeredfrm, framehdr->interpfrm);
switch (framehdr->ptype) {
case GST_VC1_PICTURE_TYPE_I:
case GST_VC1_PICTURE_TYPE_BI:
framehdr->transacfrm = get_unary (br, 0, 2);
pic->transacfrm2 = get_unary (br, 0, 2);
READ_UINT8 (br, framehdr->transdctab, 1);
GST_DEBUG ("transacfrm %u, transacfrm2 %u, transdctab %u",
framehdr->transacfrm, pic->transacfrm2, framehdr->transdctab);
break;
case GST_VC1_PICTURE_TYPE_P:
mvmodeidx = framehdr->pquant > 12;
pic->mvmode = mvmode_table[mvmodeidx][get_unary (br, 1, 4)];
if (pic->mvmode == GST_VC1_MVMODE_INTENSITY_COMP) {
pic->mvmode2 = mvmode2_table[mvmodeidx][get_unary (br, 1, 4)];
READ_UINT8 (br, pic->lumscale, 6);
READ_UINT8 (br, pic->lumshift, 6);
GST_DEBUG ("lumscale %u lumshift %u", pic->lumscale, pic->lumshift);
}
if (pic->mvmode == GST_VC1_MVMODE_MIXED_MV ||
(pic->mvmode == GST_VC1_MVMODE_INTENSITY_COMP &&
pic->mvmode2 == GST_VC1_MVMODE_MIXED_MV)) {
if (!bitplane_decoding (br, height, width, &pic->mvtypemb))
goto failed;
GST_DEBUG ("mvtypemb %u", pic->mvtypemb);
}
if (!bitplane_decoding (br, height, width, &pic->skipmb))
goto failed;
READ_UINT8 (br, pic->mvtab, 2);
READ_UINT8 (br, pic->cbptab, 2);
if (framehdr->dquant) {
parse_vopdquant (br, framehdr, framehdr->dquant);
}
if (simplehdr->vstransform) {
READ_UINT8 (br, pic->ttmbf, 1);
GST_DEBUG ("ttmbf %u", pic->ttmbf);
if (pic->ttmbf) {
READ_UINT8 (br, pic->ttfrm, 2);
GST_DEBUG ("ttfrm %u", pic->ttfrm);
}
}
framehdr->transacfrm = get_unary (br, 0, 2);
READ_UINT8 (br, framehdr->transdctab, 1);
GST_DEBUG ("transacfrm %u transdctab %u mvmode %u mvtab %u,"
"cbptab %u skipmb %u", framehdr->transacfrm, framehdr->transdctab,
pic->mvmode, pic->mvtab, pic->cbptab, pic->skipmb);
break;
case GST_VC1_PICTURE_TYPE_B:
READ_UINT8 (br, pic->mvmode, 1);
if (!bitplane_decoding (br, height, width, &pic->directmb))
goto failed;
if (!bitplane_decoding (br, height, width, &pic->skipmb) == -1)
goto failed;
READ_UINT8 (br, pic->mvtab, 2);
READ_UINT8 (br, pic->cbptab, 2);
if (framehdr->dquant)
parse_vopdquant (br, framehdr, framehdr->dquant);
if (simplehdr->vstransform) {
READ_UINT8 (br, pic->ttmbf, 1);
if (pic->ttmbf) {
READ_UINT8 (br, pic->ttfrm, 2);
}
}
framehdr->transacfrm = get_unary (br, 0, 2);
READ_UINT8 (br, framehdr->transdctab, 1);
GST_DEBUG ("transacfrm %u transdctab %u mvmode %u mvtab %u,"
"cbptab %u directmb %u skipmb %u", framehdr->transacfrm,
framehdr->transdctab, pic->mvmode, pic->mvtab, pic->cbptab,
pic->directmb, pic->skipmb);
break;
}
return GST_VC1_PARSER_OK;
failed:
GST_WARNING ("Failed to parse Simple picture header");
return GST_VC1_PARSER_ERROR;
}
/**** API ****/
/**
* gst_vc1_identify_next_bdu:
* @data: The data to parse
* @size: the size of @data
* @bdu: (out): The #GstVC1BDU where to store parsed bdu headers
*
* Parses @data and fills @bdu fields
*
* Returns: a #GstVC1ParseResult
*/
GstVC1ParseResult
gst_vc1_identify_next_bdu (const guint8 * data, gsize size, GstVC1BDU * bdu)
{
gint off1, off2;
g_return_val_if_fail (bdu != NULL, GST_VC1_PARSER_ERROR);
ensure_debug_category ();
if (size <= 4) {
GST_DEBUG ("Can't parse, buffer is to small size %" G_GSSIZE_FORMAT, size);
return GST_VC1_PARSER_ERROR;
}
off1 = scan_for_start_codes (data, size);
if (off1 < 0) {
GST_DEBUG ("No start code prefix in this buffer");
return GST_VC1_PARSER_NO_BDU;
}
bdu->sc_offset = off1;
bdu->offset = off1 + 4;
bdu->data = (guint8 *) data;
bdu->type = (GstVC1StartCode) (data[bdu->offset - 1]);
off2 = scan_for_start_codes (data + bdu->offset, size - bdu->offset);
if (off2 < 0) {
GST_DEBUG ("Bdu start %d, No end found", bdu->offset);
return GST_VC1_PARSER_NO_BDU_END;
}
if (off2 > 0 && data[bdu->offset + off2 - 1] == 00)
off2--;
bdu->size = off2;
GST_DEBUG ("Complete bdu found. Off: %d, Size: %d", bdu->offset, bdu->size);
return GST_VC1_PARSER_OK;
}
/**
* gst_vc1_parse_sequence_header:
* @data: The data to parse
* @size: the size of @data
* @seqhdr: The #GstVC1SeqHdr to set.
*
* Parses @data, and fills @seqhdr fields.
*
* Returns: a #GstVC1ParseResult
*/
GstVC1ParseResult
gst_vc1_parse_sequence_header (const guint8 * data, gsize size,
GstVC1SeqHdr * seqhdr)
{
GstBitReader br;
guint8 old_interlaced_mode;
GstVC1SimpleMainSeqHdr *simplehdr = &seqhdr->profile.simplemain;
g_return_val_if_fail (seqhdr != NULL, GST_VC1_PARSER_ERROR);
ensure_debug_category ();
gst_bit_reader_init (&br, data, size);
READ_UINT8 (&br, seqhdr->profiletype, 2);
if (seqhdr->profiletype == GST_VC1_PROFILE_ADVANCED) {
return parse_sequence_header_advanced (seqhdr, &br);
}
GST_DEBUG ("Parsing sequence header in simple or main mode");
if (gst_bit_reader_get_remaining (&br) < 29)
goto failed;
/* Reserved bits */
old_interlaced_mode = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
if (old_interlaced_mode)
GST_WARNING ("Old interlaced mode used");
simplehdr->wmvp = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
if (simplehdr->wmvp)
GST_DEBUG ("WMVP mode");
seqhdr->frmrtq_postproc = gst_bit_reader_get_bits_uint8_unchecked (&br, 3);
seqhdr->bitrtq_postproc = gst_bit_reader_get_bits_uint8_unchecked (&br, 5);
simplehdr->loop_filter = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
/* Skipping reserved3 bit */
gst_bit_reader_skip_unchecked (&br, 1);
simplehdr->multires = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
/* Skipping reserved4 bit */
gst_bit_reader_skip_unchecked (&br, 1);
simplehdr->fastuvmc = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
simplehdr->extended_mv = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
simplehdr->dquant = gst_bit_reader_get_bits_uint8_unchecked (&br, 2);
simplehdr->vstransform = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
/* Skipping reserved5 bit */
gst_bit_reader_skip_unchecked (&br, 1);
simplehdr->overlap = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
simplehdr->syncmarker = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
simplehdr->rangered = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
simplehdr->maxbframes = gst_bit_reader_get_bits_uint8_unchecked (&br, 3);
simplehdr->quantizer = gst_bit_reader_get_bits_uint8_unchecked (&br, 2);
seqhdr->finterpflag = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
GST_DEBUG ("frmrtq_postproc %u, bitrtq_postproc %u, loop_filter %u, "
"multires %u, fastuvmc %u, extended_mv %u, dquant %u, vstransform %u, "
"overlap %u, syncmarker %u, rangered %u, maxbframes %u, quantizer %u, "
"finterpflag %u", seqhdr->frmrtq_postproc, seqhdr->bitrtq_postproc,
simplehdr->loop_filter, simplehdr->multires, simplehdr->fastuvmc,
simplehdr->extended_mv, simplehdr->dquant, simplehdr->vstransform,
simplehdr->overlap, simplehdr->syncmarker, simplehdr->rangered,
simplehdr->maxbframes, simplehdr->quantizer, seqhdr->finterpflag);
if (simplehdr->wmvp) {
if (gst_bit_reader_get_remaining (&br) < 29)
goto failed;
simplehdr->coded_width = gst_bit_reader_get_bits_uint16_unchecked (&br, 11);
simplehdr->coded_height =
gst_bit_reader_get_bits_uint16_unchecked (&br, 11);
simplehdr->framerate = gst_bit_reader_get_bits_uint8_unchecked (&br, 5);
gst_bit_reader_skip_unchecked (&br, 1);
simplehdr->slice_code = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
GST_DEBUG ("coded_width %u, coded_height %u, framerate %u slice_code %u",
simplehdr->coded_width, simplehdr->coded_height, simplehdr->framerate,
simplehdr->slice_code);
}
return GST_VC1_PARSER_OK;
failed:
GST_WARNING ("Failed to parse sequence header");
return GST_VC1_PARSER_ERROR;
}
/**
* gst_vc1_parse_entry_point_header:
* @data: The data to parse
* @size: the size of @data
* @entrypoint: (out): The #GstVC1EntryPointHdr to set.
* @seqhdr: The #GstVC1SeqHdr currently being parsed
*
* Parses @data, and sets @entrypoint fields.
*
* Returns: a #GstVC1EntryPointHdr
*/
GstVC1ParseResult
gst_vc1_parse_entry_point_header (const guint8 * data, gsize size,
GstVC1EntryPointHdr * entrypoint, GstVC1SeqHdr * seqhdr)
{
GstBitReader br;
guint8 i;
GstVC1AdvancedSeqHdr *advanced = &seqhdr->profile.advanced;
g_return_val_if_fail (entrypoint != NULL, GST_VC1_PARSER_ERROR);
ensure_debug_category ();
gst_bit_reader_init (&br, data, size);
if (gst_bit_reader_get_remaining (&br) < 13)
goto failed;
entrypoint->broken_link = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
entrypoint->closed_entry = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
entrypoint->panscan_flag = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
entrypoint->refdist_flag = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
entrypoint->loopfilter = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
entrypoint->fastuvmc = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
entrypoint->extended_mv = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
entrypoint->dquant = gst_bit_reader_get_bits_uint8_unchecked (&br, 2);
entrypoint->vstransform = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
entrypoint->overlap = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
entrypoint->quantizer = gst_bit_reader_get_bits_uint8_unchecked (&br, 2);
if (advanced->hrd_param_flag) {
for (i = 0; i < seqhdr->profile.advanced.hrd_param.hrd_num_leaky_buckets;
i++)
READ_UINT8 (&br, entrypoint->hrd_full[MAX_HRD_NUM_LEAKY_BUCKETS], 8);
}
READ_UINT8 (&br, entrypoint->coded_size_flag, 1);
if (entrypoint->coded_size_flag) {
READ_UINT16 (&br, entrypoint->coded_width, 12);
READ_UINT16 (&br, entrypoint->coded_height, 12);
entrypoint->coded_height = (entrypoint->coded_height + 1) << 1;
entrypoint->coded_width = (entrypoint->coded_width + 1) << 1;
}
if (entrypoint->extended_mv)
READ_UINT8 (&br, entrypoint->extended_dmv, 1);
READ_UINT8 (&br, entrypoint->range_mapy_flag, 1);
if (entrypoint->range_mapy_flag)
READ_UINT8 (&br, entrypoint->range_mapy, 3);
READ_UINT8 (&br, entrypoint->range_mapuv_flag, 1);
if (entrypoint->range_mapy_flag)
READ_UINT8 (&br, entrypoint->range_mapuv, 3);
advanced->entrypoint = *entrypoint;
return GST_VC1_PARSER_OK;
failed:
GST_WARNING ("Failed to parse entry point header");
return GST_VC1_PARSER_ERROR;
}
/**
* gst_vc1_parse_frame_header:
* @data: The data to parse
* @size: the size of @data
* @entrypoint: The #GstVC1EntryPointHdr to set.
* @seqhdr: The #GstVC1SeqHdr currently being parsed
*
* Parses @data, and fills @entrypoint fields.
*
* Returns: a #GstVC1EntryPointHdr
*/
GstVC1ParseResult
gst_vc1_parse_frame_header (const guint8 * data, gsize size,
GstVC1FrameHdr * framehdr, GstVC1SeqHdr * seqhdr)
{
GstBitReader br;
ensure_debug_category ();
gst_bit_reader_init (&br, data, size);
if (seqhdr->profiletype == GST_VC1_PROFILE_ADVANCED)
return parse_frame_header_advanced (&br, framehdr, seqhdr);
else
return parse_frame_header (&br, framehdr, seqhdr);
}
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