/*
* Bytestream functions
* copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
+ * Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
*
- * 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
-#define DEF(name, bytes, read, write)\
-static av_always_inline unsigned int bytestream_get_ ## name(uint8_t **b){\
- (*b) += bytes;\
- return read(*b - bytes);\
-}\
-static av_always_inline void bytestream_put_ ##name(uint8_t **b, const unsigned int value){\
- write(*b, value);\
- (*b) += bytes;\
-};
+#include <stdint.h>
+#include <string.h>
-DEF(le32, 4, AV_RL32, AV_WL32)
-DEF(le16, 2, AV_RL16, AV_WL16)
-DEF(be32, 4, AV_RB32, AV_WB32)
-DEF(be16, 2, AV_RB16, AV_WB16)
-DEF(byte, 1, AV_RB8 , AV_WB8 )
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
-#undef DEF
+typedef struct GetByteContext {
+ const uint8_t *buffer, *buffer_end, *buffer_start;
+} GetByteContext;
-static av_always_inline unsigned int bytestream_get_buffer(uint8_t **b, uint8_t *dst, unsigned int size)
+typedef struct PutByteContext {
+ uint8_t *buffer, *buffer_end, *buffer_start;
+ int eof;
+} PutByteContext;
+
+#define DEF(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 void bytestream2_put_ ## name ## u(PutByteContext *p, \
+ const type value) \
+{ \
+ bytestream_put_ ## name(&p->buffer, value); \
+} \
+static av_always_inline void bytestream2_put_ ## name(PutByteContext *p, \
+ const type value) \
+{ \
+ if (!p->eof && (p->buffer_end - p->buffer >= bytes)) { \
+ write(p->buffer, value); \
+ p->buffer += bytes; \
+ } else \
+ p->eof = 1; \
+} \
+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); \
+}
+
+DEF(uint64_t, le64, 8, AV_RL64, AV_WL64)
+DEF(unsigned int, le32, 4, AV_RL32, AV_WL32)
+DEF(unsigned int, le24, 3, AV_RL24, AV_WL24)
+DEF(unsigned int, le16, 2, AV_RL16, AV_WL16)
+DEF(uint64_t, be64, 8, AV_RB64, AV_WB64)
+DEF(unsigned int, be32, 4, AV_RB32, AV_WB32)
+DEF(unsigned int, be24, 3, AV_RB24, AV_WB24)
+DEF(unsigned int, be16, 2, AV_RB16, AV_WB16)
+DEF(unsigned int, byte, 1, AV_RB8 , AV_WB8)
+
+#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)
+{
+ g->buffer = buf;
+ g->buffer_start = buf;
+ g->buffer_end = buf + buf_size;
+}
+
+static av_always_inline void bytestream2_init_writer(PutByteContext *p,
+ uint8_t *buf,
+ int buf_size)
+{
+ p->buffer = buf;
+ p->buffer_start = buf;
+ p->buffer_end = buf + buf_size;
+ p->eof = 0;
+}
+
+static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
+{
+ return g->buffer_end - g->buffer;
+}
+
+static av_always_inline unsigned int bytestream2_get_bytes_left_p(PutByteContext *p)
+{
+ return p->buffer_end - p->buffer;
+}
+
+static av_always_inline void bytestream2_skip(GetByteContext *g,
+ unsigned int size)
+{
+ g->buffer += FFMIN(g->buffer_end - g->buffer, size);
+}
+
+static av_always_inline void bytestream2_skipu(GetByteContext *g,
+ unsigned int size)
+{
+ g->buffer += size;
+}
+
+static av_always_inline void bytestream2_skip_p(PutByteContext *p,
+ unsigned int size)
+{
+ int size2;
+ if (p->eof)
+ return;
+ size2 = FFMIN(p->buffer_end - p->buffer, size);
+ if (size2 != size)
+ p->eof = 1;
+ p->buffer += size2;
+}
+
+static av_always_inline int bytestream2_tell(GetByteContext *g)
+{
+ return (int)(g->buffer - g->buffer_start);
+}
+
+static av_always_inline int bytestream2_tell_p(PutByteContext *p)
+{
+ return (int)(p->buffer - p->buffer_start);
+}
+
+static av_always_inline int bytestream2_seek(GetByteContext *g,
+ int offset,
+ int whence)
+{
+ 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 av_always_inline int bytestream2_seek_p(PutByteContext *p,
+ int offset,
+ int whence)
+{
+ p->eof = 0;
+ switch (whence) {
+ case SEEK_CUR:
+ if (p->buffer_end - p->buffer < offset)
+ p->eof = 1;
+ offset = av_clip(offset, -(p->buffer - p->buffer_start),
+ p->buffer_end - p->buffer);
+ p->buffer += offset;
+ break;
+ case SEEK_END:
+ if (offset > 0)
+ p->eof = 1;
+ offset = av_clip(offset, -(p->buffer_end - p->buffer_start), 0);
+ p->buffer = p->buffer_end + offset;
+ break;
+ case SEEK_SET:
+ if (p->buffer_end - p->buffer_start < offset)
+ p->eof = 1;
+ offset = av_clip(offset, 0, p->buffer_end - p->buffer_start);
+ p->buffer = p->buffer_start + offset;
+ break;
+ default:
+ return AVERROR(EINVAL);
+ }
+ return bytestream2_tell_p(p);
+}
+
+static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g,
+ uint8_t *dst,
+ unsigned int size)
+{
+ int size2 = FFMIN(g->buffer_end - g->buffer, size);
+ memcpy(dst, g->buffer, size2);
+ g->buffer += size2;
+ return size2;
+}
+
+static av_always_inline unsigned int bytestream2_get_bufferu(GetByteContext *g,
+ uint8_t *dst,
+ unsigned int size)
+{
+ memcpy(dst, g->buffer, size);
+ g->buffer += size;
+ return size;
+}
+
+static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p,
+ const uint8_t *src,
+ unsigned int size)
+{
+ int size2;
+ if (p->eof)
+ return 0;
+ size2 = FFMIN(p->buffer_end - p->buffer, size);
+ if (size2 != size)
+ p->eof = 1;
+ memcpy(p->buffer, src, size2);
+ p->buffer += size2;
+ return size2;
+}
+
+static av_always_inline unsigned int bytestream2_put_bufferu(PutByteContext *p,
+ const uint8_t *src,
+ unsigned int size)
+{
+ memcpy(p->buffer, src, size);
+ p->buffer += size;
+ return size;
+}
+
+static av_always_inline void bytestream2_set_buffer(PutByteContext *p,
+ const uint8_t c,
+ unsigned int size)
+{
+ int size2;
+ if (p->eof)
+ return;
+ size2 = FFMIN(p->buffer_end - p->buffer, size);
+ if (size2 != size)
+ p->eof = 1;
+ memset(p->buffer, c, size2);
+ p->buffer += size2;
+}
+
+static av_always_inline void bytestream2_set_bufferu(PutByteContext *p,
+ const uint8_t c,
+ unsigned int size)
+{
+ memset(p->buffer, c, size);
+ p->buffer += size;
+}
+
+static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p)
+{
+ return p->eof;
+}
+
+static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b,
+ uint8_t *dst,
+ unsigned int size)
{
memcpy(dst, *b, size);
(*b) += size;
return size;
}
-static av_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