* Bytestream functions
* copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#ifndef FFMPEG_BYTESTREAM_H
-#define FFMPEG_BYTESTREAM_H
+#ifndef AVCODEC_BYTESTREAM_H
+#define AVCODEC_BYTESTREAM_H
-static always_inline unsigned int bytestream_get_le32(uint8_t **b)
+#include <string.h>
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+
+typedef struct {
+ const uint8_t *buffer, *buffer_end, *buffer_start;
+} GetByteContext;
+
+#define DEF_T(type, name, bytes, read, write) \
+static av_always_inline type bytestream_get_ ## name(const uint8_t **b){\
+ (*b) += bytes;\
+ return read(*b - bytes);\
+}\
+static av_always_inline void bytestream_put_ ##name(uint8_t **b, const type value){\
+ write(*b, value);\
+ (*b) += bytes;\
+}\
+static av_always_inline type bytestream2_get_ ## name ## u(GetByteContext *g)\
+{\
+ return bytestream_get_ ## name(&g->buffer);\
+}\
+static av_always_inline type bytestream2_get_ ## name(GetByteContext *g)\
+{\
+ if (g->buffer_end - g->buffer < bytes)\
+ return 0;\
+ return bytestream2_get_ ## name ## u(g);\
+}\
+static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g)\
+{\
+ if (g->buffer_end - g->buffer < bytes)\
+ return 0;\
+ return read(g->buffer);\
+}
+
+#define DEF(name, bytes, read, write) \
+ DEF_T(unsigned int, name, bytes, read, write)
+#define DEF64(name, bytes, read, write) \
+ DEF_T(uint64_t, name, bytes, read, write)
+
+DEF64(le64, 8, AV_RL64, AV_WL64)
+DEF (le32, 4, AV_RL32, AV_WL32)
+DEF (le24, 3, AV_RL24, AV_WL24)
+DEF (le16, 2, AV_RL16, AV_WL16)
+DEF64(be64, 8, AV_RB64, AV_WB64)
+DEF (be32, 4, AV_RB32, AV_WB32)
+DEF (be24, 3, AV_RB24, AV_WB24)
+DEF (be16, 2, AV_RB16, AV_WB16)
+DEF (byte, 1, AV_RB8 , AV_WB8 )
+
+#undef DEF
+#undef DEF64
+#undef DEF_T
+
+#if HAVE_BIGENDIAN
+# define bytestream2_get_ne16 bytestream2_get_be16
+# define bytestream2_get_ne24 bytestream2_get_be24
+# define bytestream2_get_ne32 bytestream2_get_be32
+# define bytestream2_get_ne64 bytestream2_get_be64
+# define bytestream2_get_ne16u bytestream2_get_be16u
+# define bytestream2_get_ne24u bytestream2_get_be24u
+# define bytestream2_get_ne32u bytestream2_get_be32u
+# define bytestream2_get_ne64u bytestream2_get_be64u
+# define bytestream2_put_ne16 bytestream2_put_be16
+# define bytestream2_put_ne24 bytestream2_put_be24
+# define bytestream2_put_ne32 bytestream2_put_be32
+# define bytestream2_put_ne64 bytestream2_put_be64
+# define bytestream2_peek_ne16 bytestream2_peek_be16
+# define bytestream2_peek_ne24 bytestream2_peek_be24
+# define bytestream2_peek_ne32 bytestream2_peek_be32
+# define bytestream2_peek_ne64 bytestream2_peek_be64
+#else
+# define bytestream2_get_ne16 bytestream2_get_le16
+# define bytestream2_get_ne24 bytestream2_get_le24
+# define bytestream2_get_ne32 bytestream2_get_le32
+# define bytestream2_get_ne64 bytestream2_get_le64
+# define bytestream2_get_ne16u bytestream2_get_le16u
+# define bytestream2_get_ne24u bytestream2_get_le24u
+# define bytestream2_get_ne32u bytestream2_get_le32u
+# define bytestream2_get_ne64u bytestream2_get_le64u
+# define bytestream2_put_ne16 bytestream2_put_le16
+# define bytestream2_put_ne24 bytestream2_put_le24
+# define bytestream2_put_ne32 bytestream2_put_le32
+# define bytestream2_put_ne64 bytestream2_put_le64
+# define bytestream2_peek_ne16 bytestream2_peek_le16
+# define bytestream2_peek_ne24 bytestream2_peek_le24
+# define bytestream2_peek_ne32 bytestream2_peek_le32
+# define bytestream2_peek_ne64 bytestream2_peek_le64
+#endif
+
+static av_always_inline void bytestream2_init(GetByteContext *g,
+ const uint8_t *buf, int buf_size)
{
- (*b) += 4;
- return LE_32(*b - 4);
+ g->buffer = buf;
+ g->buffer_start = buf;
+ g->buffer_end = buf + buf_size;
}
-static always_inline unsigned int bytestream_get_le16(uint8_t **b)
+static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
{
- (*b) += 2;
- return LE_16(*b - 2);
+ return g->buffer_end - g->buffer;
}
-static always_inline unsigned int bytestream_get_byte(uint8_t **b)
+static av_always_inline void bytestream2_skip(GetByteContext *g,
+ unsigned int size)
{
- (*b)++;
- return (*b)[-1];
+ g->buffer += FFMIN(g->buffer_end - g->buffer, size);
}
-static always_inline unsigned int bytestream_get_buffer(uint8_t **b, uint8_t *dst, unsigned int size)
+static av_always_inline int bytestream2_tell(GetByteContext *g)
{
- memcpy(dst, *b, size);
- (*b) += size;
- return size;
+ return (int)(g->buffer - g->buffer_start);
}
-static always_inline void bytestream_put_le32(uint8_t **b, const unsigned int value)
+static av_always_inline int bytestream2_seek(GetByteContext *g, int offset,
+ int whence)
{
- *(*b)++ = value;
- *(*b)++ = value >> 8;
- *(*b)++ = value >> 16;
- *(*b)++ = value >> 24;
+ switch (whence) {
+ case SEEK_CUR:
+ offset = av_clip(offset, -(g->buffer - g->buffer_start),
+ g->buffer_end - g->buffer);
+ g->buffer += offset;
+ break;
+ case SEEK_END:
+ offset = av_clip(offset, -(g->buffer_end - g->buffer_start), 0);
+ g->buffer = g->buffer_end + offset;
+ break;
+ case SEEK_SET:
+ offset = av_clip(offset, 0, g->buffer_end - g->buffer_start);
+ g->buffer = g->buffer_start + offset;
+ break;
+ default:
+ return AVERROR(EINVAL);
+ }
+ return bytestream2_tell(g);
}
-static always_inline void bytestream_put_le16(uint8_t **b, const unsigned int value)
+static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g,
+ uint8_t *dst,
+ unsigned int size)
{
- *(*b)++ = value;
- *(*b)++ = value >> 8;
+ int size2 = FFMIN(g->buffer_end - g->buffer, size);
+ memcpy(dst, g->buffer, size2);
+ g->buffer += size2;
+ return size2;
}
-static always_inline void bytestream_put_byte(uint8_t **b, const unsigned int value)
+static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size)
{
- *(*b)++ = value;
+ memcpy(dst, *b, size);
+ (*b) += size;
+ return size;
}
-static always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
+static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
{
memcpy(*b, src, size);
(*b) += size;
}
-#endif /* FFMPEG_BYTESTREAM_H */
+#endif /* AVCODEC_BYTESTREAM_H */
projects / ffmpeg / blobdiff