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We not only want to create a NAL gstmemory, but also need to create and get the raw data of a NAL writer for the later usage. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1051>
265 lines
7.6 KiB
C
265 lines
7.6 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 <gst/base/gstbitwriter.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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typedef struct
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{
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GstBitWriter bw;
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guint nal_prefix_size;
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gboolean packetized;
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} NalWriter;
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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_WITH_DEBUG(dbg, val, max) { \
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if (val > max) { \
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GST_WARNING ("value for '" dbg "' 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_MAX(val, max) \
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CHECK_ALLOWED_MAX_WITH_DEBUG (G_STRINGIFY (val), val, max)
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#define CHECK_ALLOWED_WITH_DEBUG(dbg, val, min, max) { \
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if (val < min || val > max) { \
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GST_WARNING ("value for '" dbg "' 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 CHECK_ALLOWED(val, min, max) \
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CHECK_ALLOWED_WITH_DEBUG (G_STRINGIFY (val), val, min, max)
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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 for '" G_STRINGIFY (val) "', 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 for '" G_STRINGIFY (val) "', 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 for '" G_STRINGIFY (val) "', 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 for '" G_STRINGIFY (val) "', 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 for '" G_STRINGIFY (val) "'"); \
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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_WITH_DEBUG (G_STRINGIFY (val), 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_WITH_DEBUG (G_STRINGIFY (val), 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 for '" G_STRINGIFY (val) "'"); \
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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_WITH_DEBUG (G_STRINGIFY (val), 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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G_GNUC_INTERNAL
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void nal_writer_init (NalWriter * nw, guint nal_prefix_size, gboolean packetized);
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G_GNUC_INTERNAL
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void nal_writer_reset (NalWriter * nw);
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G_GNUC_INTERNAL
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gboolean nal_writer_do_rbsp_trailing_bits (NalWriter * nw);
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G_GNUC_INTERNAL
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GstMemory * nal_writer_reset_and_get_memory (NalWriter * nw);
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G_GNUC_INTERNAL
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guint8 * nal_writer_reset_and_get_data (NalWriter * nw, guint32 * ret_size);
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G_GNUC_INTERNAL
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gboolean nal_writer_put_bits_uint8 (NalWriter * nw, guint8 value, guint nbits);
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G_GNUC_INTERNAL
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gboolean nal_writer_put_bits_uint16 (NalWriter * nw, guint16 value, guint nbits);
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G_GNUC_INTERNAL
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gboolean nal_writer_put_bits_uint32 (NalWriter * nw, guint32 value, guint nbits);
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G_GNUC_INTERNAL
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gboolean nal_writer_put_bytes (NalWriter * nw, const guint8 * data, guint nbytes);
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G_GNUC_INTERNAL
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gboolean nal_writer_put_ue (NalWriter * nw, guint32 value);
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G_GNUC_INTERNAL
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gboolean count_exp_golomb_bits (guint32 value, guint * leading_zeros, guint * rest);
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#define WRITE_UINT8(nw, val, nbits) { \
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if (!nal_writer_put_bits_uint8 (nw, val, nbits)) { \
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GST_WARNING ("failed to write uint8 for '" G_STRINGIFY (val) "', nbits: %d", nbits); \
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goto error; \
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} \
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}
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#define WRITE_UINT16(nw, val, nbits) { \
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if (!nal_writer_put_bits_uint16 (nw, val, nbits)) { \
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GST_WARNING ("failed to write uint16 for '" G_STRINGIFY (val) "', nbits: %d", nbits); \
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goto error; \
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} \
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}
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#define WRITE_UINT32(nw, val, nbits) { \
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if (!nal_writer_put_bits_uint32 (nw, val, nbits)) { \
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GST_WARNING ("failed to write uint32 for '" G_STRINGIFY (val) "', nbits: %d", nbits); \
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goto error; \
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} \
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}
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#define WRITE_BYTES(nw, data, nbytes) { \
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if (!nal_writer_put_bytes (nw, data, nbytes)) { \
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GST_WARNING ("failed to write bytes for '" G_STRINGIFY (val) "', nbits: %d", nbytes); \
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goto error; \
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} \
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}
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#define WRITE_UE(nw, val) { \
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if (!nal_writer_put_ue (nw, val)) { \
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GST_WARNING ("failed to write ue for '" G_STRINGIFY (val) "'"); \
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goto error; \
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} \
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}
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