diff options
Diffstat (limited to 'libavformat/aviobuf.c')
-rw-r--r-- | libavformat/aviobuf.c | 253 |
1 files changed, 197 insertions, 56 deletions
diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c index 59f807c..7de59f1 100644 --- a/libavformat/aviobuf.c +++ b/libavformat/aviobuf.c @@ -2,28 +2,30 @@ * buffered I/O * Copyright (c) 2000,2001 Fabrice Bellard * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg 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. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +#include "libavutil/bprint.h" #include "libavutil/crc.h" #include "libavutil/dict.h" #include "libavutil/intreadwrite.h" #include "libavutil/log.h" #include "libavutil/opt.h" +#include "libavutil/avassert.h" #include "avformat.h" #include "avio.h" #include "avio_internal.h" @@ -77,9 +79,11 @@ int ffio_init_context(AVIOContext *s, int64_t (*seek)(void *opaque, int64_t offset, int whence)) { s->buffer = buffer; + s->orig_buffer_size = s->buffer_size = buffer_size; s->buf_ptr = buffer; s->opaque = opaque; + s->direct = 0; url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ); @@ -121,28 +125,36 @@ AVIOContext *avio_alloc_context( return s; } -static void flush_buffer(AVIOContext *s) +static void writeout(AVIOContext *s, const uint8_t *data, int len) { - if (s->buf_ptr > s->buffer) { - if (s->write_packet && !s->error) { - int ret = s->write_packet(s->opaque, s->buffer, - s->buf_ptr - s->buffer); - if (ret < 0) { - s->error = ret; - } + if (s->write_packet && !s->error) { + int ret = s->write_packet(s->opaque, (uint8_t *)data, len); + if (ret < 0) { + s->error = ret; } + } + s->writeout_count ++; + s->pos += len; +} + +static void flush_buffer(AVIOContext *s) +{ + if (s->write_flag && s->buf_ptr > s->buffer) { + writeout(s, s->buffer, s->buf_ptr - s->buffer); if (s->update_checksum) { s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr); s->checksum_ptr = s->buffer; } - s->pos += s->buf_ptr - s->buffer; } s->buf_ptr = s->buffer; + if (!s->write_flag) + s->buf_end = s->buffer; } void avio_w8(AVIOContext *s, int b) { + av_assert2(b>=-128 && b<=255); *s->buf_ptr++ = b; if (s->buf_ptr >= s->buf_end) flush_buffer(s); @@ -164,6 +176,11 @@ void ffio_fill(AVIOContext *s, int b, int count) void avio_write(AVIOContext *s, const unsigned char *buf, int size) { + if (s->direct && !s->update_checksum) { + avio_flush(s); + writeout(s, buf, size); + return; + } while (size > 0) { int len = FFMIN(s->buf_end - s->buf_ptr, size); memcpy(s->buf_ptr, buf, len); @@ -188,12 +205,14 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence) int64_t offset1; int64_t pos; int force = whence & AVSEEK_FORCE; + int buffer_size; whence &= ~AVSEEK_FORCE; if(!s) return AVERROR(EINVAL); - pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer)); + buffer_size = s->buf_end - s->buffer; + pos = s->pos - (s->write_flag ? 0 : buffer_size); if (whence != SEEK_CUR && whence != SEEK_SET) return AVERROR(EINVAL); @@ -204,23 +223,38 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence) return offset1; offset += offset1; } + if (offset < 0) + return AVERROR(EINVAL); + offset1 = offset - pos; - if (!s->must_flush && - offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) { + if (!s->must_flush && (!s->direct || !s->seek) && + offset1 >= 0 && offset1 <= buffer_size - s->write_flag) { /* can do the seek inside the buffer */ s->buf_ptr = s->buffer + offset1; } else if ((!s->seekable || offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) && !s->write_flag && offset1 >= 0 && + (!s->direct || !s->seek) && (whence != SEEK_END || force)) { while(s->pos < offset && !s->eof_reached) fill_buffer(s); if (s->eof_reached) return AVERROR_EOF; s->buf_ptr = s->buf_end + offset - s->pos; - } else { + } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) { int64_t res; + pos -= FFMIN(buffer_size>>1, pos); + if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0) + return res; + s->buf_end = + s->buf_ptr = s->buffer; + s->pos = pos; + s->eof_reached = 0; + fill_buffer(s); + return avio_seek(s, offset, SEEK_SET | force); + } else { + int64_t res; if (s->write_flag) { flush_buffer(s); s->must_flush = 1; @@ -229,6 +263,7 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence) return AVERROR(EPIPE); if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0) return res; + s->seek_count ++; if (!s->write_flag) s->buf_end = s->buffer; s->buf_ptr = s->buffer; @@ -238,6 +273,11 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence) return offset; } +int64_t avio_skip(AVIOContext *s, int64_t offset) +{ + return avio_seek(s, offset, SEEK_CUR); +} + int64_t avio_size(AVIOContext *s) { int64_t size; @@ -257,20 +297,38 @@ int64_t avio_size(AVIOContext *s) return size; } +int avio_feof(AVIOContext *s) +{ + if(!s) + return 0; + if(s->eof_reached){ + s->eof_reached=0; + fill_buffer(s); + } + return s->eof_reached; +} + +#if FF_API_URL_FEOF +int url_feof(AVIOContext *s) +{ + return avio_feof(s); +} +#endif + void avio_wl32(AVIOContext *s, unsigned int val) { - avio_w8(s, val); - avio_w8(s, val >> 8); - avio_w8(s, val >> 16); - avio_w8(s, val >> 24); + avio_w8(s, (uint8_t) val ); + avio_w8(s, (uint8_t)(val >> 8 )); + avio_w8(s, (uint8_t)(val >> 16)); + avio_w8(s, val >> 24 ); } void avio_wb32(AVIOContext *s, unsigned int val) { - avio_w8(s, val >> 24); - avio_w8(s, val >> 16); - avio_w8(s, val >> 8); - avio_w8(s, val); + avio_w8(s, val >> 24 ); + avio_w8(s, (uint8_t)(val >> 16)); + avio_w8(s, (uint8_t)(val >> 8 )); + avio_w8(s, (uint8_t) val ); } int avio_put_str(AVIOContext *s, const char *str) @@ -284,23 +342,45 @@ int avio_put_str(AVIOContext *s, const char *str) return len; } -int avio_put_str16le(AVIOContext *s, const char *str) +static inline int put_str16(AVIOContext *s, const char *str, const int be) { const uint8_t *q = str; int ret = 0; + int err = 0; while (*q) { uint32_t ch; uint16_t tmp; - GET_UTF8(ch, *q++, break;) - PUT_UTF16(ch, tmp, avio_wl16(s, tmp); ret += 2;) + GET_UTF8(ch, *q++, goto invalid;) + PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp); + ret += 2;) + continue; +invalid: + av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le"); + err = AVERROR(EINVAL); } - avio_wl16(s, 0); + if (be) + avio_wb16(s, 0); + else + avio_wl16(s, 0); + if (err) + return err; ret += 2; return ret; } +#define PUT_STR16(type, big_endian) \ +int avio_put_str16 ## type(AVIOContext *s, const char *str) \ +{ \ +return put_str16(s, str, big_endian); \ +} + +PUT_STR16(le, 0) +PUT_STR16(be, 1) + +#undef PUT_STR16 + int ff_get_v_length(uint64_t val) { int i = 1; @@ -316,7 +396,7 @@ void ff_put_v(AVIOContext *bc, uint64_t val) int i = ff_get_v_length(val); while (--i > 0) - avio_w8(bc, 128 | (val >> (7 * i))); + avio_w8(bc, 128 | (uint8_t)(val >> (7*i))); avio_w8(bc, val & 127); } @@ -335,38 +415,37 @@ void avio_wb64(AVIOContext *s, uint64_t val) void avio_wl16(AVIOContext *s, unsigned int val) { - avio_w8(s, val); - avio_w8(s, val >> 8); + avio_w8(s, (uint8_t)val); + avio_w8(s, (int)val >> 8); } void avio_wb16(AVIOContext *s, unsigned int val) { - avio_w8(s, val >> 8); - avio_w8(s, val); + avio_w8(s, (int)val >> 8); + avio_w8(s, (uint8_t)val); } void avio_wl24(AVIOContext *s, unsigned int val) { avio_wl16(s, val & 0xffff); - avio_w8(s, val >> 16); + avio_w8(s, (int)val >> 16); } void avio_wb24(AVIOContext *s, unsigned int val) { - avio_wb16(s, val >> 8); - avio_w8(s, val); + avio_wb16(s, (int)val >> 8); + avio_w8(s, (uint8_t)val); } /* Input stream */ static void fill_buffer(AVIOContext *s) { - uint8_t *dst = !s->max_packet_size && - s->buf_end - s->buffer < s->buffer_size ? - s->buf_end : s->buffer; - int len = s->buffer_size - (dst - s->buffer); int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE; + uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ? + s->buf_end : s->buffer; + int len = s->buffer_size - (dst - s->buffer); /* can't fill the buffer without read_packet, just set EOF if appropriate */ if (!s->read_packet && s->buf_ptr >= s->buf_end) @@ -384,11 +463,14 @@ static void fill_buffer(AVIOContext *s) } /* make buffer smaller in case it ended up large after probing */ - if (s->buffer_size > max_buffer_size) { - ffio_set_buf_size(s, max_buffer_size); + if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) { + if (dst == s->buffer) { + ffio_set_buf_size(s, s->orig_buffer_size); - s->checksum_ptr = dst = s->buffer; - len = s->buffer_size; + s->checksum_ptr = dst = s->buffer; + } + av_assert0(len >= s->orig_buffer_size); + len = s->orig_buffer_size; } if (s->read_packet) @@ -405,6 +487,7 @@ static void fill_buffer(AVIOContext *s) s->pos += len; s->buf_ptr = dst; s->buf_end = dst + len; + s->bytes_read += len; } } @@ -459,7 +542,7 @@ int avio_read(AVIOContext *s, unsigned char *buf, int size) if (len > size) len = size; if (len == 0 || s->write_flag) { - if(size > s->buffer_size && !s->update_checksum){ + if((s->direct || size > s->buffer_size) && !s->update_checksum){ if(s->read_packet) len = s->read_packet(s->opaque, buf, size); if (len <= 0) { @@ -471,6 +554,7 @@ int avio_read(AVIOContext *s, unsigned char *buf, int size) break; } else { s->pos += len; + s->bytes_read += len; size -= len; buf += len; s->buf_ptr = s->buffer; @@ -490,8 +574,8 @@ int avio_read(AVIOContext *s, unsigned char *buf, int size) } } if (size1 == size) { - if (s->error) return s->error; - if (s->eof_reached) return AVERROR_EOF; + if (s->error) return s->error; + if (avio_feof(s)) return AVERROR_EOF; } return size1 - size; } @@ -539,8 +623,8 @@ int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size) memcpy(buf, s->buf_ptr, len); s->buf_ptr += len; if (!len) { - if (s->error) return s->error; - if (s->eof_reached) return AVERROR_EOF; + if (s->error) return s->error; + if (avio_feof(s)) return AVERROR_EOF; } return len; } @@ -609,7 +693,9 @@ int ff_get_line(AVIOContext *s, char *buf, int maxlen) c = avio_r8(s); if (c && i < maxlen-1) buf[i++] = c; - } while (c != '\n' && c); + } while (c != '\n' && c != '\r' && c); + if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s)) + avio_skip(s, -1); buf[i] = 0; return i; @@ -699,6 +785,7 @@ int ffio_fdopen(AVIOContext **s, URLContext *h) av_free(buffer); return AVERROR(ENOMEM); } + (*s)->direct = h->flags & AVIO_FLAG_DIRECT; (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL; (*s)->max_packet_size = max_packet_size; if(h->prot) { @@ -709,6 +796,32 @@ int ffio_fdopen(AVIOContext **s, URLContext *h) return 0; } +int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size) +{ + uint8_t *buffer; + int max_buffer_size = s->max_packet_size ? + s->max_packet_size : IO_BUFFER_SIZE; + int filled = s->buf_end - s->buffer; + + buf_size += s->buf_ptr - s->buffer + max_buffer_size; + + if (buf_size < filled || s->seekable) + return 0; + av_assert0(!s->write_flag); + + buffer = av_malloc(buf_size); + if (!buffer) + return AVERROR(ENOMEM); + + memcpy(buffer, s->buffer, filled); + av_free(s->buffer); + s->buf_ptr = buffer + (s->buf_ptr - s->buffer); + s->buf_end = buffer + (s->buf_end - s->buffer); + s->buffer = buffer; + s->buffer_size = buf_size; + return 0; +} + int ffio_set_buf_size(AVIOContext *s, int buf_size) { uint8_t *buffer; @@ -718,6 +831,7 @@ int ffio_set_buf_size(AVIOContext *s, int buf_size) av_free(s->buffer); s->buffer = buffer; + s->orig_buffer_size = s->buffer_size = buf_size; s->buf_ptr = buffer; url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ); @@ -726,7 +840,7 @@ int ffio_set_buf_size(AVIOContext *s, int buf_size) static int url_resetbuf(AVIOContext *s, int flags) { - assert(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ); + av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ); if (flags & AVIO_FLAG_WRITE) { s->buf_end = s->buffer + s->buffer_size; @@ -738,27 +852,32 @@ static int url_resetbuf(AVIOContext *s, int flags) return 0; } -int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size) +int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size) { int64_t buffer_start; int buffer_size; int overlap, new_size, alloc_size; + uint8_t *buf = *bufp; - if (s->write_flag) + if (s->write_flag) { + av_freep(bufp); return AVERROR(EINVAL); + } buffer_size = s->buf_end - s->buffer; /* the buffers must touch or overlap */ - if ((buffer_start = s->pos - buffer_size) > buf_size) + if ((buffer_start = s->pos - buffer_size) > buf_size) { + av_freep(bufp); return AVERROR(EINVAL); + } overlap = buf_size - buffer_start; new_size = buf_size + buffer_size - overlap; alloc_size = FFMAX(s->buffer_size, new_size); if (alloc_size > buf_size) - if (!(buf = av_realloc(buf, alloc_size))) + if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size))) return AVERROR(ENOMEM); if (new_size > buf_size) { @@ -809,6 +928,10 @@ int avio_close(AVIOContext *s) avio_flush(s); h = s->opaque; av_freep(&s->buffer); + if (s->write_flag) + av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count); + else + av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count); av_free(s); return ffurl_close(h); } @@ -860,6 +983,24 @@ int64_t avio_seek_time(AVIOContext *s, int stream_index, return ret; } +int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size) +{ + int ret; + char buf[1024]; + while (max_size) { + ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf))); + if (ret == AVERROR_EOF) + return 0; + if (ret <= 0) + return ret; + av_bprint_append_data(pb, buf, ret); + if (!av_bprint_is_complete(pb)) + return AVERROR(ENOMEM); + max_size -= ret; + } + return 0; +} + /* output in a dynamic buffer */ typedef struct DynBuffer { |