iter2 step2: GLib/GStreamer compat shim, build succeeds

Vendored gsth265parser + nalutils + gstbitreader + gstbytereader (the Step 1 commit) compile cleanly against libc + libv4l2 only after adding 1 compat translation unit + 5 stub headers, no edits to the vendored .c/.h files themselves. src/h265_parser/gst_compat.{h,c} — new files (MIT, original work): - GLib type aliases (gboolean, gchar, gint*, guint*, gsize, gpointer) - Memory helpers (g_malloc/g_free as #define free, g_memdup2 inline) - Asserts as no-op + parser-return-code-propagation - All GST_DEBUG/INFO/WARNING/ERROR/LOG/FIXME as no-ops (the parser is heavy on debug logging; we compile it all out) - GArray implementation (~100 LOC, just enough for gsth265parser.c's 24 call sites) - GList full struct with .data/.next/.prev so callers compile; list-manipulation functions abort() — dead code paths only - Byte-order read/write macros (GST_READ_UINT8/16/24/32/64_LE/BE, GST_WRITE_UINT8/16/24/32_BE) — aarch64 LE inlines - g_once_init_enter/leave as simple gate - G_MAXUINT*, G_MAXINT*, G_MINxxx, G_GNUC_* attribute macros, etc. - Opaque GstBuffer/GstMemory/GstMapInfo + abort-stub functions for the encoder-side SEI-insertion paths the libva backend never invokes - gst_util_ceil_log2 real impl (used by slice-header parser; dead for our SPS-only call path but cheaper to implement than stub) src/h265_parser/gst/{gst.h,base/base-prelude.h,base/gstbitwriter.h, codecparsers/codecparsers-prelude.h,glib-compat-private.h} — 5 new stub headers (MIT). All include gst_compat.h. gstbitwriter.h adds abort-stub functions for the bit-writer API (used by nalutils.c's NAL emulation-prevention encoder path — dead code for the parse-only libva backend). src/meson.build — added the 5 new .c source files and 10 new .h headers; added include_directories('h265_parser') to the include path so the vendored files' '#include <gst/base/...>' style references resolve to the stub headers + actual vendored files in the local tree. Build verified: ninja -C build produces v4l2_request_drv_video.so (682 KB, up from 485 KB pre-vendor — the +200 KB is the vendored parser code). nm shows gst_h265_parse_sps, gst_h265_parse_sps_ext, gst_h265_parser_identify_nalu, and the other functions we need for Step 4 are present in the binary. Two #warning messages from gsth265parser.h about API stability are upstream-intentional and harmless ('The H.265 parsing library is unstable API and may change in future'). This commit completes Step 2 of ampere-kernel-decoders iter2 Phase 6. Backend remains functionally identical to pre-iter2 — the new code compiles + links but is not yet called from h265_set_controls (that's Step 4). Existing 5 codecs continue to work as before. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-16 11:06:30 +02:00
parent c9b7fcff50
commit 9f7437e8ee
16 changed files with 746 additions and 3 deletions
@@ -0,0 +1,307 @@
+/* GStreamer
+ *
+ * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#define GST_BIT_READER_DISABLE_INLINES
+#include "gstbitreader.h"
+
+#include <string.h>
+
+/**
+ * SECTION:gstbitreader
+ * @title: GstBitReader
+ * @short_description: Reads any number of bits from a memory buffer
+ * @symbols:
+ * - gst_bit_reader_skip_unchecked
+ * - gst_bit_reader_skip_to_byte_unchecked
+ * - gst_bit_reader_get_bits_uint8_unchecked
+ * - gst_bit_reader_peek_bits_uint8_unchecked
+ * - gst_bit_reader_get_bits_uint16_unchecked
+ * - gst_bit_reader_peek_bits_uint16_unchecked
+ * - gst_bit_reader_get_bits_uint32_unchecked
+ * - gst_bit_reader_peek_bits_uint32_unchecked
+ * - gst_bit_reader_get_bits_uint64_unchecked
+ * - gst_bit_reader_peek_bits_uint64_unchecked
+ *
+ * #GstBitReader provides a bit reader that can read any number of bits
+ * from a memory buffer. It provides functions for reading any number of bits
+ * into 8, 16, 32 and 64 bit variables.
+ */
+
+/**
+ * gst_bit_reader_new: (skip)
+ * @data: (array length=size): Data from which the #GstBitReader
+ *   should read
+ * @size: Size of @data in bytes
+ *
+ * Create a new #GstBitReader instance, which will read from @data.
+ *
+ * Free-function: gst_bit_reader_free
+ *
+ * Returns: (transfer full): a new #GstBitReader instance
+ */
+GstBitReader *
+gst_bit_reader_new (const guint8 * data, guint size)
+{
+  GstBitReader *ret = g_new0 (GstBitReader, 1);
+
+  ret->data = data;
+  ret->size = size;
+
+  return ret;
+}
+
+/**
+ * gst_bit_reader_free:
+ * @reader: (in) (transfer full): a #GstBitReader instance
+ *
+ * Frees a #GstBitReader instance, which was previously allocated by
+ * gst_bit_reader_new().
+ */
+void
+gst_bit_reader_free (GstBitReader * reader)
+{
+  g_return_if_fail (reader != NULL);
+
+  g_free (reader);
+}
+
+/**
+ * gst_bit_reader_init:
+ * @reader: a #GstBitReader instance
+ * @data: (in) (array length=size): data from which the bit reader should read
+ * @size: Size of @data in bytes
+ *
+ * Initializes a #GstBitReader instance to read from @data. This function
+ * can be called on already initialized instances.
+ */
+void
+gst_bit_reader_init (GstBitReader * reader, const guint8 * data, guint size)
+{
+  g_return_if_fail (reader != NULL);
+
+  reader->data = data;
+  reader->size = size;
+  reader->byte = reader->bit = 0;
+}
+
+/**
+ * gst_bit_reader_set_pos:
+ * @reader: a #GstBitReader instance
+ * @pos: The new position in bits
+ *
+ * Sets the new position of a #GstBitReader instance to @pos in bits.
+ *
+ * Returns: %TRUE if the position could be set successfully, %FALSE
+ * otherwise.
+ */
+gboolean
+gst_bit_reader_set_pos (GstBitReader * reader, guint pos)
+{
+  g_return_val_if_fail (reader != NULL, FALSE);
+
+  if (pos > reader->size * 8)
+    return FALSE;
+
+  reader->byte = pos / 8;
+  reader->bit = pos % 8;
+
+  return TRUE;
+}
+
+/**
+ * gst_bit_reader_get_pos:
+ * @reader: a #GstBitReader instance
+ *
+ * Returns the current position of a #GstBitReader instance in bits.
+ *
+ * Returns: The current position of @reader in bits.
+ */
+guint
+gst_bit_reader_get_pos (const GstBitReader * reader)
+{
+  return _gst_bit_reader_get_pos_inline (reader);
+}
+
+/**
+ * gst_bit_reader_get_remaining:
+ * @reader: a #GstBitReader instance
+ *
+ * Returns the remaining number of bits of a #GstBitReader instance.
+ *
+ * Returns: The remaining number of bits of @reader instance.
+ */
+guint
+gst_bit_reader_get_remaining (const GstBitReader * reader)
+{
+  return _gst_bit_reader_get_remaining_inline (reader);
+}
+
+/**
+ * gst_bit_reader_get_size:
+ * @reader: a #GstBitReader instance
+ *
+ * Returns the total number of bits of a #GstBitReader instance.
+ *
+ * Returns: The total number of bits of @reader instance.
+ */
+guint
+gst_bit_reader_get_size (const GstBitReader * reader)
+{
+  return _gst_bit_reader_get_size_inline (reader);
+}
+
+/**
+ * gst_bit_reader_skip:
+ * @reader: a #GstBitReader instance
+ * @nbits: the number of bits to skip
+ *
+ * Skips @nbits bits of the #GstBitReader instance.
+ *
+ * Returns: %TRUE if @nbits bits could be skipped, %FALSE otherwise.
+ */
+gboolean
+gst_bit_reader_skip (GstBitReader * reader, guint nbits)
+{
+  return _gst_bit_reader_skip_inline (reader, nbits);
+}
+
+/**
+ * gst_bit_reader_skip_to_byte:
+ * @reader: a #GstBitReader instance
+ *
+ * Skips until the next byte.
+ *
+ * Returns: %TRUE if successful, %FALSE otherwise.
+ */
+gboolean
+gst_bit_reader_skip_to_byte (GstBitReader * reader)
+{
+  return _gst_bit_reader_skip_to_byte_inline (reader);
+}
+
+/**
+ * gst_bit_reader_get_bits_uint8:
+ * @reader: a #GstBitReader instance
+ * @val: (out): Pointer to a #guint8 to store the result
+ * @nbits: number of bits to read
+ *
+ * Read @nbits bits into @val and update the current position.
+ *
+ * Returns: %TRUE if successful, %FALSE otherwise.
+ */
+
+/**
+ * gst_bit_reader_get_bits_uint16:
+ * @reader: a #GstBitReader instance
+ * @val: (out): Pointer to a #guint16 to store the result
+ * @nbits: number of bits to read
+ *
+ * Read @nbits bits into @val and update the current position.
+ *
+ * Returns: %TRUE if successful, %FALSE otherwise.
+ */
+
+/**
+ * gst_bit_reader_get_bits_uint32:
+ * @reader: a #GstBitReader instance
+ * @val: (out): Pointer to a #guint32 to store the result
+ * @nbits: number of bits to read
+ *
+ * Read @nbits bits into @val and update the current position.
+ *
+ * Returns: %TRUE if successful, %FALSE otherwise.
+ */
+
+/**
+ * gst_bit_reader_get_bits_uint64:
+ * @reader: a #GstBitReader instance
+ * @val: (out): Pointer to a #guint64 to store the result
+ * @nbits: number of bits to read
+ *
+ * Read @nbits bits into @val and update the current position.
+ *
+ * Returns: %TRUE if successful, %FALSE otherwise.
+ */
+
+/**
+ * gst_bit_reader_peek_bits_uint8:
+ * @reader: a #GstBitReader instance
+ * @val: (out): Pointer to a #guint8 to store the result
+ * @nbits: number of bits to read
+ *
+ * Read @nbits bits into @val but keep the current position.
+ *
+ * Returns: %TRUE if successful, %FALSE otherwise.
+ */
+
+/**
+ * gst_bit_reader_peek_bits_uint16:
+ * @reader: a #GstBitReader instance
+ * @val: (out): Pointer to a #guint16 to store the result
+ * @nbits: number of bits to read
+ *
+ * Read @nbits bits into @val but keep the current position.
+ *
+ * Returns: %TRUE if successful, %FALSE otherwise.
+ */
+
+/**
+ * gst_bit_reader_peek_bits_uint32:
+ * @reader: a #GstBitReader instance
+ * @val: (out): Pointer to a #guint32 to store the result
+ * @nbits: number of bits to read
+ *
+ * Read @nbits bits into @val but keep the current position.
+ *
+ * Returns: %TRUE if successful, %FALSE otherwise.
+ */
+
+/**
+ * gst_bit_reader_peek_bits_uint64:
+ * @reader: a #GstBitReader instance
+ * @val: (out): Pointer to a #guint64 to store the result
+ * @nbits: number of bits to read
+ *
+ * Read @nbits bits into @val but keep the current position.
+ *
+ * Returns: %TRUE if successful, %FALSE otherwise.
+ */
+
+#define GST_BIT_READER_READ_BITS(bits) \
+gboolean \
+gst_bit_reader_peek_bits_uint##bits (const GstBitReader *reader, guint##bits *val, guint nbits) \
+{ \
+  return _gst_bit_reader_peek_bits_uint##bits##_inline (reader, val, nbits); \
+} \
+\
+gboolean \
+gst_bit_reader_get_bits_uint##bits (GstBitReader *reader, guint##bits *val, guint nbits) \
+{ \
+  return _gst_bit_reader_get_bits_uint##bits##_inline (reader, val, nbits); \
+}
+
+GST_BIT_READER_READ_BITS (8);
+GST_BIT_READER_READ_BITS (16);
+GST_BIT_READER_READ_BITS (32);
+GST_BIT_READER_READ_BITS (64);