yading@10: /* yading@10: * Bytestream functions yading@10: * copyright (c) 2006 Baptiste Coudurier yading@10: * Copyright (c) 2012 Aneesh Dogra (lionaneesh) yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: #ifndef AVCODEC_BYTESTREAM_H yading@10: #define AVCODEC_BYTESTREAM_H yading@10: yading@10: #include yading@10: #include yading@10: yading@10: #include "libavutil/common.h" yading@10: #include "libavutil/intreadwrite.h" yading@10: yading@10: typedef struct GetByteContext { yading@10: const uint8_t *buffer, *buffer_end, *buffer_start; yading@10: } GetByteContext; yading@10: yading@10: typedef struct PutByteContext { yading@10: uint8_t *buffer, *buffer_end, *buffer_start; yading@10: int eof; yading@10: } PutByteContext; yading@10: yading@10: #define DEF(type, name, bytes, read, write) \ yading@10: static av_always_inline type bytestream_get_ ## name(const uint8_t **b) \ yading@10: { \ yading@10: (*b) += bytes; \ yading@10: return read(*b - bytes); \ yading@10: } \ yading@10: static av_always_inline void bytestream_put_ ## name(uint8_t **b, \ yading@10: const type value) \ yading@10: { \ yading@10: write(*b, value); \ yading@10: (*b) += bytes; \ yading@10: } \ yading@10: static av_always_inline void bytestream2_put_ ## name ## u(PutByteContext *p, \ yading@10: const type value) \ yading@10: { \ yading@10: bytestream_put_ ## name(&p->buffer, value); \ yading@10: } \ yading@10: static av_always_inline void bytestream2_put_ ## name(PutByteContext *p, \ yading@10: const type value) \ yading@10: { \ yading@10: if (!p->eof && (p->buffer_end - p->buffer >= bytes)) { \ yading@10: write(p->buffer, value); \ yading@10: p->buffer += bytes; \ yading@10: } else \ yading@10: p->eof = 1; \ yading@10: } \ yading@10: static av_always_inline type bytestream2_get_ ## name ## u(GetByteContext *g) \ yading@10: { \ yading@10: return bytestream_get_ ## name(&g->buffer); \ yading@10: } \ yading@10: static av_always_inline type bytestream2_get_ ## name(GetByteContext *g) \ yading@10: { \ yading@10: if (g->buffer_end - g->buffer < bytes) \ yading@10: return 0; \ yading@10: return bytestream2_get_ ## name ## u(g); \ yading@10: } \ yading@10: static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g) \ yading@10: { \ yading@10: if (g->buffer_end - g->buffer < bytes) \ yading@10: return 0; \ yading@10: return read(g->buffer); \ yading@10: } yading@10: yading@10: DEF(uint64_t, le64, 8, AV_RL64, AV_WL64) yading@10: DEF(unsigned int, le32, 4, AV_RL32, AV_WL32) yading@10: DEF(unsigned int, le24, 3, AV_RL24, AV_WL24) yading@10: DEF(unsigned int, le16, 2, AV_RL16, AV_WL16) yading@10: DEF(uint64_t, be64, 8, AV_RB64, AV_WB64) yading@10: DEF(unsigned int, be32, 4, AV_RB32, AV_WB32) yading@10: DEF(unsigned int, be24, 3, AV_RB24, AV_WB24) yading@10: DEF(unsigned int, be16, 2, AV_RB16, AV_WB16) yading@10: DEF(unsigned int, byte, 1, AV_RB8 , AV_WB8) yading@10: yading@10: #if HAVE_BIGENDIAN yading@10: # define bytestream2_get_ne16 bytestream2_get_be16 yading@10: # define bytestream2_get_ne24 bytestream2_get_be24 yading@10: # define bytestream2_get_ne32 bytestream2_get_be32 yading@10: # define bytestream2_get_ne64 bytestream2_get_be64 yading@10: # define bytestream2_get_ne16u bytestream2_get_be16u yading@10: # define bytestream2_get_ne24u bytestream2_get_be24u yading@10: # define bytestream2_get_ne32u bytestream2_get_be32u yading@10: # define bytestream2_get_ne64u bytestream2_get_be64u yading@10: # define bytestream2_put_ne16 bytestream2_put_be16 yading@10: # define bytestream2_put_ne24 bytestream2_put_be24 yading@10: # define bytestream2_put_ne32 bytestream2_put_be32 yading@10: # define bytestream2_put_ne64 bytestream2_put_be64 yading@10: # define bytestream2_peek_ne16 bytestream2_peek_be16 yading@10: # define bytestream2_peek_ne24 bytestream2_peek_be24 yading@10: # define bytestream2_peek_ne32 bytestream2_peek_be32 yading@10: # define bytestream2_peek_ne64 bytestream2_peek_be64 yading@10: #else yading@10: # define bytestream2_get_ne16 bytestream2_get_le16 yading@10: # define bytestream2_get_ne24 bytestream2_get_le24 yading@10: # define bytestream2_get_ne32 bytestream2_get_le32 yading@10: # define bytestream2_get_ne64 bytestream2_get_le64 yading@10: # define bytestream2_get_ne16u bytestream2_get_le16u yading@10: # define bytestream2_get_ne24u bytestream2_get_le24u yading@10: # define bytestream2_get_ne32u bytestream2_get_le32u yading@10: # define bytestream2_get_ne64u bytestream2_get_le64u yading@10: # define bytestream2_put_ne16 bytestream2_put_le16 yading@10: # define bytestream2_put_ne24 bytestream2_put_le24 yading@10: # define bytestream2_put_ne32 bytestream2_put_le32 yading@10: # define bytestream2_put_ne64 bytestream2_put_le64 yading@10: # define bytestream2_peek_ne16 bytestream2_peek_le16 yading@10: # define bytestream2_peek_ne24 bytestream2_peek_le24 yading@10: # define bytestream2_peek_ne32 bytestream2_peek_le32 yading@10: # define bytestream2_peek_ne64 bytestream2_peek_le64 yading@10: #endif yading@10: yading@10: static av_always_inline void bytestream2_init(GetByteContext *g, yading@10: const uint8_t *buf, yading@10: int buf_size) yading@10: { yading@10: g->buffer = buf; yading@10: g->buffer_start = buf; yading@10: g->buffer_end = buf + buf_size; yading@10: } yading@10: yading@10: static av_always_inline void bytestream2_init_writer(PutByteContext *p, yading@10: uint8_t *buf, yading@10: int buf_size) yading@10: { yading@10: p->buffer = buf; yading@10: p->buffer_start = buf; yading@10: p->buffer_end = buf + buf_size; yading@10: p->eof = 0; yading@10: } yading@10: yading@10: static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g) yading@10: { yading@10: return g->buffer_end - g->buffer; yading@10: } yading@10: yading@10: static av_always_inline unsigned int bytestream2_get_bytes_left_p(PutByteContext *p) yading@10: { yading@10: return p->buffer_end - p->buffer; yading@10: } yading@10: yading@10: static av_always_inline void bytestream2_skip(GetByteContext *g, yading@10: unsigned int size) yading@10: { yading@10: g->buffer += FFMIN(g->buffer_end - g->buffer, size); yading@10: } yading@10: yading@10: static av_always_inline void bytestream2_skipu(GetByteContext *g, yading@10: unsigned int size) yading@10: { yading@10: g->buffer += size; yading@10: } yading@10: yading@10: static av_always_inline void bytestream2_skip_p(PutByteContext *p, yading@10: unsigned int size) yading@10: { yading@10: int size2; yading@10: if (p->eof) yading@10: return; yading@10: size2 = FFMIN(p->buffer_end - p->buffer, size); yading@10: if (size2 != size) yading@10: p->eof = 1; yading@10: p->buffer += size2; yading@10: } yading@10: yading@10: static av_always_inline int bytestream2_tell(GetByteContext *g) yading@10: { yading@10: return (int)(g->buffer - g->buffer_start); yading@10: } yading@10: yading@10: static av_always_inline int bytestream2_tell_p(PutByteContext *p) yading@10: { yading@10: return (int)(p->buffer - p->buffer_start); yading@10: } yading@10: yading@10: static av_always_inline int bytestream2_size(GetByteContext *g) yading@10: { yading@10: return (int)(g->buffer_end - g->buffer_start); yading@10: } yading@10: yading@10: static av_always_inline int bytestream2_size_p(PutByteContext *p) yading@10: { yading@10: return (int)(p->buffer_end - p->buffer_start); yading@10: } yading@10: yading@10: static av_always_inline int bytestream2_seek(GetByteContext *g, yading@10: int offset, yading@10: int whence) yading@10: { yading@10: switch (whence) { yading@10: case SEEK_CUR: yading@10: offset = av_clip(offset, -(g->buffer - g->buffer_start), yading@10: g->buffer_end - g->buffer); yading@10: g->buffer += offset; yading@10: break; yading@10: case SEEK_END: yading@10: offset = av_clip(offset, -(g->buffer_end - g->buffer_start), 0); yading@10: g->buffer = g->buffer_end + offset; yading@10: break; yading@10: case SEEK_SET: yading@10: offset = av_clip(offset, 0, g->buffer_end - g->buffer_start); yading@10: g->buffer = g->buffer_start + offset; yading@10: break; yading@10: default: yading@10: return AVERROR(EINVAL); yading@10: } yading@10: return bytestream2_tell(g); yading@10: } yading@10: yading@10: static av_always_inline int bytestream2_seek_p(PutByteContext *p, yading@10: int offset, yading@10: int whence) yading@10: { yading@10: p->eof = 0; yading@10: switch (whence) { yading@10: case SEEK_CUR: yading@10: if (p->buffer_end - p->buffer < offset) yading@10: p->eof = 1; yading@10: offset = av_clip(offset, -(p->buffer - p->buffer_start), yading@10: p->buffer_end - p->buffer); yading@10: p->buffer += offset; yading@10: break; yading@10: case SEEK_END: yading@10: if (offset > 0) yading@10: p->eof = 1; yading@10: offset = av_clip(offset, -(p->buffer_end - p->buffer_start), 0); yading@10: p->buffer = p->buffer_end + offset; yading@10: break; yading@10: case SEEK_SET: yading@10: if (p->buffer_end - p->buffer_start < offset) yading@10: p->eof = 1; yading@10: offset = av_clip(offset, 0, p->buffer_end - p->buffer_start); yading@10: p->buffer = p->buffer_start + offset; yading@10: break; yading@10: default: yading@10: return AVERROR(EINVAL); yading@10: } yading@10: return bytestream2_tell_p(p); yading@10: } yading@10: yading@10: static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, yading@10: uint8_t *dst, yading@10: unsigned int size) yading@10: { yading@10: int size2 = FFMIN(g->buffer_end - g->buffer, size); yading@10: memcpy(dst, g->buffer, size2); yading@10: g->buffer += size2; yading@10: return size2; yading@10: } yading@10: yading@10: static av_always_inline unsigned int bytestream2_get_bufferu(GetByteContext *g, yading@10: uint8_t *dst, yading@10: unsigned int size) yading@10: { yading@10: memcpy(dst, g->buffer, size); yading@10: g->buffer += size; yading@10: return size; yading@10: } yading@10: yading@10: static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p, yading@10: const uint8_t *src, yading@10: unsigned int size) yading@10: { yading@10: int size2; yading@10: if (p->eof) yading@10: return 0; yading@10: size2 = FFMIN(p->buffer_end - p->buffer, size); yading@10: if (size2 != size) yading@10: p->eof = 1; yading@10: memcpy(p->buffer, src, size2); yading@10: p->buffer += size2; yading@10: return size2; yading@10: } yading@10: yading@10: static av_always_inline unsigned int bytestream2_put_bufferu(PutByteContext *p, yading@10: const uint8_t *src, yading@10: unsigned int size) yading@10: { yading@10: memcpy(p->buffer, src, size); yading@10: p->buffer += size; yading@10: return size; yading@10: } yading@10: yading@10: static av_always_inline void bytestream2_set_buffer(PutByteContext *p, yading@10: const uint8_t c, yading@10: unsigned int size) yading@10: { yading@10: int size2; yading@10: if (p->eof) yading@10: return; yading@10: size2 = FFMIN(p->buffer_end - p->buffer, size); yading@10: if (size2 != size) yading@10: p->eof = 1; yading@10: memset(p->buffer, c, size2); yading@10: p->buffer += size2; yading@10: } yading@10: yading@10: static av_always_inline void bytestream2_set_bufferu(PutByteContext *p, yading@10: const uint8_t c, yading@10: unsigned int size) yading@10: { yading@10: memset(p->buffer, c, size); yading@10: p->buffer += size; yading@10: } yading@10: yading@10: static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p) yading@10: { yading@10: return p->eof; yading@10: } yading@10: yading@10: static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, yading@10: uint8_t *dst, yading@10: unsigned int size) yading@10: { yading@10: memcpy(dst, *b, size); yading@10: (*b) += size; yading@10: return size; yading@10: } yading@10: yading@10: static av_always_inline void bytestream_put_buffer(uint8_t **b, yading@10: const uint8_t *src, yading@10: unsigned int size) yading@10: { yading@10: memcpy(*b, src, size); yading@10: (*b) += size; yading@10: } yading@10: yading@10: #endif /* AVCODEC_BYTESTREAM_H */