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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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55db6413d7
Add a separate epb_cache variable to the codecparser NalReader to detect Emulation Prevention Bytes separately from the main bit cache. This fixes problems where the existing logic can mistakenly detect multiple EPB with a sequence like: 0x00 0x00 0x03 0x00 0x03. In that case, the 5th byte should not be regarded as an EPB.
184 lines
5 KiB
C
184 lines
5 KiB
C
/* Gstreamer
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* Copyright (C) <2011> Intel Corporation
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* Copyright (C) <2011> Collabora Ltd.
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* Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.com>
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*
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* Some bits C-c,C-v'ed and s/4/3 from h264parse and videoparsers/h264parse.c:
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* Copyright (C) <2010> Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
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* Copyright (C) <2010> Collabora Multimedia
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* Copyright (C) <2010> Nokia Corporation
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*
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* (C) 2005 Michal Benes <michal.benes@itonis.tv>
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* (C) 2008 Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* Common code for NAL parsing from h264 and h265 parsers.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gst/base/gstbytereader.h>
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#include <gst/base/gstbitreader.h>
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#include <string.h>
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guint ceil_log2 (guint32 v);
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typedef struct
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{
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const guint8 *data;
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guint size;
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guint n_epb; /* Number of emulation prevention bytes */
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guint byte; /* Byte position */
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guint bits_in_cache; /* bitpos in the cache of next bit */
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guint8 first_byte;
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guint32 epb_cache; /* cache 3 bytes to check emulation prevention bytes */
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guint64 cache; /* cached bytes */
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} NalReader;
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G_GNUC_INTERNAL
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void nal_reader_init (NalReader * nr, const guint8 * data, guint size);
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G_GNUC_INTERNAL
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gboolean nal_reader_read (NalReader * nr, guint nbits);
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G_GNUC_INTERNAL
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gboolean nal_reader_skip (NalReader * nr, guint nbits);
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G_GNUC_INTERNAL
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gboolean nal_reader_skip_long (NalReader * nr, guint nbits);
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G_GNUC_INTERNAL
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guint nal_reader_get_pos (const NalReader * nr);
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G_GNUC_INTERNAL
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guint nal_reader_get_remaining (const NalReader * nr);
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G_GNUC_INTERNAL
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guint nal_reader_get_epb_count (const NalReader * nr);
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G_GNUC_INTERNAL
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gboolean nal_reader_is_byte_aligned (NalReader * nr);
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G_GNUC_INTERNAL
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gboolean nal_reader_has_more_data (NalReader * nr);
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#define NAL_READER_READ_BITS_H(bits) \
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G_GNUC_INTERNAL \
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gboolean nal_reader_get_bits_uint##bits (NalReader *nr, guint##bits *val, guint nbits)
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NAL_READER_READ_BITS_H (8);
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NAL_READER_READ_BITS_H (16);
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NAL_READER_READ_BITS_H (32);
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#define NAL_READER_PEEK_BITS_H(bits) \
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G_GNUC_INTERNAL \
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gboolean nal_reader_peek_bits_uint##bits (const NalReader *nr, guint##bits *val, guint nbits)
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NAL_READER_PEEK_BITS_H (8);
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G_GNUC_INTERNAL
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gboolean nal_reader_get_ue (NalReader * nr, guint32 * val);
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G_GNUC_INTERNAL
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gboolean nal_reader_get_se (NalReader * nr, gint32 * val);
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#define CHECK_ALLOWED_MAX(val, max) { \
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if (val > max) { \
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GST_WARNING ("value greater than max. value: %d, max %d", \
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val, max); \
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goto error; \
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} \
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}
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#define CHECK_ALLOWED(val, min, max) { \
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if (val < min || val > max) { \
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GST_WARNING ("value not in allowed range. value: %d, range %d-%d", \
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val, min, max); \
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goto error; \
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} \
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}
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#define READ_UINT8(nr, val, nbits) { \
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if (!nal_reader_get_bits_uint8 (nr, &val, nbits)) { \
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GST_WARNING ("failed to read uint8, nbits: %d", nbits); \
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goto error; \
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} \
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}
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#define READ_UINT16(nr, val, nbits) { \
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if (!nal_reader_get_bits_uint16 (nr, &val, nbits)) { \
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GST_WARNING ("failed to read uint16, nbits: %d", nbits); \
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goto error; \
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} \
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}
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#define READ_UINT32(nr, val, nbits) { \
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if (!nal_reader_get_bits_uint32 (nr, &val, nbits)) { \
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GST_WARNING ("failed to read uint32, nbits: %d", nbits); \
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goto error; \
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} \
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}
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#define READ_UINT64(nr, val, nbits) { \
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if (!nal_reader_get_bits_uint64 (nr, &val, nbits)) { \
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GST_WARNING ("failed to read uint32, nbits: %d", nbits); \
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goto error; \
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} \
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}
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#define READ_UE(nr, val) { \
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if (!nal_reader_get_ue (nr, &val)) { \
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GST_WARNING ("failed to read UE"); \
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goto error; \
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} \
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}
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#define READ_UE_ALLOWED(nr, val, min, max) { \
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guint32 tmp; \
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READ_UE (nr, tmp); \
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CHECK_ALLOWED (tmp, min, max); \
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val = tmp; \
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}
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#define READ_UE_MAX(nr, val, max) { \
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guint32 tmp; \
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READ_UE (nr, tmp); \
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CHECK_ALLOWED_MAX (tmp, max); \
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val = tmp; \
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}
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#define READ_SE(nr, val) { \
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if (!nal_reader_get_se (nr, &val)) { \
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GST_WARNING ("failed to read SE"); \
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goto error; \
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} \
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}
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#define READ_SE_ALLOWED(nr, val, min, max) { \
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gint32 tmp; \
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READ_SE (nr, tmp); \
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CHECK_ALLOWED (tmp, min, max); \
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val = tmp; \
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}
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G_GNUC_INTERNAL
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gint scan_for_start_codes (const guint8 * data, guint size);
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