| /* |
| * buffered I/O |
| * Copyright (c) 2000,2001 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * 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. |
| * |
| * 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 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" |
| #include "internal.h" |
| #include "url.h" |
| #include <stdarg.h> |
| |
| #define IO_BUFFER_SIZE 32768 |
| |
| /** |
| * Do seeks within this distance ahead of the current buffer by skipping |
| * data instead of calling the protocol seek function, for seekable |
| * protocols. |
| */ |
| #define SHORT_SEEK_THRESHOLD 4096 |
| |
| static void *ffio_url_child_next(void *obj, void *prev) |
| { |
| AVIOContext *s = obj; |
| return prev ? NULL : s->opaque; |
| } |
| |
| static const AVClass *ffio_url_child_class_next(const AVClass *prev) |
| { |
| return prev ? NULL : &ffurl_context_class; |
| } |
| |
| static const AVOption ffio_url_options[] = { |
| { NULL }, |
| }; |
| |
| const AVClass ffio_url_class = { |
| .class_name = "AVIOContext", |
| .item_name = av_default_item_name, |
| .version = LIBAVUTIL_VERSION_INT, |
| .option = ffio_url_options, |
| .child_next = ffio_url_child_next, |
| .child_class_next = ffio_url_child_class_next, |
| }; |
| |
| static void fill_buffer(AVIOContext *s); |
| static int url_resetbuf(AVIOContext *s, int flags); |
| |
| int ffio_init_context(AVIOContext *s, |
| unsigned char *buffer, |
| int buffer_size, |
| int write_flag, |
| void *opaque, |
| int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
| int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 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); |
| |
| s->write_packet = write_packet; |
| s->read_packet = read_packet; |
| s->seek = seek; |
| s->pos = 0; |
| s->must_flush = 0; |
| s->eof_reached = 0; |
| s->error = 0; |
| s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0; |
| s->max_packet_size = 0; |
| s->update_checksum = NULL; |
| |
| if (!read_packet && !write_flag) { |
| s->pos = buffer_size; |
| s->buf_end = s->buffer + buffer_size; |
| } |
| s->read_pause = NULL; |
| s->read_seek = NULL; |
| |
| return 0; |
| } |
| |
| AVIOContext *avio_alloc_context( |
| unsigned char *buffer, |
| int buffer_size, |
| int write_flag, |
| void *opaque, |
| int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
| int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
| int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
| { |
| AVIOContext *s = av_mallocz(sizeof(AVIOContext)); |
| if (!s) |
| return NULL; |
| ffio_init_context(s, buffer, buffer_size, write_flag, opaque, |
| read_packet, write_packet, seek); |
| return s; |
| } |
| |
| static void writeout(AVIOContext *s, const uint8_t *data, int len) |
| { |
| 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->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->buf_ptr = 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); |
| } |
| |
| void ffio_fill(AVIOContext *s, int b, int count) |
| { |
| while (count > 0) { |
| int len = FFMIN(s->buf_end - s->buf_ptr, count); |
| memset(s->buf_ptr, b, len); |
| s->buf_ptr += len; |
| |
| if (s->buf_ptr >= s->buf_end) |
| flush_buffer(s); |
| |
| count -= len; |
| } |
| } |
| |
| 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); |
| s->buf_ptr += len; |
| |
| if (s->buf_ptr >= s->buf_end) |
| flush_buffer(s); |
| |
| buf += len; |
| size -= len; |
| } |
| } |
| |
| void avio_flush(AVIOContext *s) |
| { |
| flush_buffer(s); |
| s->must_flush = 0; |
| } |
| |
| 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); |
| |
| 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); |
| |
| if (whence == SEEK_CUR) { |
| offset1 = pos + (s->buf_ptr - s->buffer); |
| if (offset == 0) |
| return offset1; |
| offset += offset1; |
| } |
| offset1 = offset - pos; |
| if (!s->must_flush && (!s->direct || !s->seek) && |
| offset1 >= 0 && offset1 <= buffer_size) { |
| /* 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 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; |
| } |
| if (!s->seek) |
| 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; |
| s->pos = offset; |
| } |
| s->eof_reached = 0; |
| 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; |
| |
| if (!s) |
| return AVERROR(EINVAL); |
| |
| if (!s->seek) |
| return AVERROR(ENOSYS); |
| size = s->seek(s->opaque, 0, AVSEEK_SIZE); |
| if (size < 0) { |
| if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0) |
| return size; |
| size++; |
| s->seek(s->opaque, s->pos, SEEK_SET); |
| } |
| 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, (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, (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) |
| { |
| int len = 1; |
| if (str) { |
| len += strlen(str); |
| avio_write(s, (const unsigned char *) str, len); |
| } else |
| avio_w8(s, 0); |
| return len; |
| } |
| |
| int avio_put_str16le(AVIOContext *s, const char *str) |
| { |
| const uint8_t *q = str; |
| int ret = 0; |
| int err = 0; |
| |
| while (*q) { |
| uint32_t ch; |
| uint16_t tmp; |
| |
| GET_UTF8(ch, *q++, goto invalid;) |
| PUT_UTF16(ch, tmp, avio_wl16(s, tmp); ret += 2;) |
| continue; |
| invalid: |
| av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16le\n"); |
| err = AVERROR(EINVAL); |
| } |
| avio_wl16(s, 0); |
| if (err) |
| return err; |
| ret += 2; |
| return ret; |
| } |
| |
| int ff_get_v_length(uint64_t val) |
| { |
| int i = 1; |
| |
| while (val >>= 7) |
| i++; |
| |
| return i; |
| } |
| |
| void ff_put_v(AVIOContext *bc, uint64_t val) |
| { |
| int i = ff_get_v_length(val); |
| |
| while (--i > 0) |
| avio_w8(bc, 128 | (uint8_t)(val >> (7*i))); |
| |
| avio_w8(bc, val & 127); |
| } |
| |
| void avio_wl64(AVIOContext *s, uint64_t val) |
| { |
| avio_wl32(s, (uint32_t)(val & 0xffffffff)); |
| avio_wl32(s, (uint32_t)(val >> 32)); |
| } |
| |
| void avio_wb64(AVIOContext *s, uint64_t val) |
| { |
| avio_wb32(s, (uint32_t)(val >> 32)); |
| avio_wb32(s, (uint32_t)(val & 0xffffffff)); |
| } |
| |
| void avio_wl16(AVIOContext *s, unsigned int val) |
| { |
| avio_w8(s, (uint8_t)val); |
| avio_w8(s, (int)val >> 8); |
| } |
| |
| void avio_wb16(AVIOContext *s, unsigned int 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, (int)val >> 16); |
| } |
| |
| void avio_wb24(AVIOContext *s, unsigned int val) |
| { |
| avio_wb16(s, (int)val >> 8); |
| avio_w8(s, (uint8_t)val); |
| } |
| |
| /* Input stream */ |
| |
| static void fill_buffer(AVIOContext *s) |
| { |
| 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) |
| s->eof_reached = 1; |
| |
| /* no need to do anything if EOF already reached */ |
| if (s->eof_reached) |
| return; |
| |
| if (s->update_checksum && dst == s->buffer) { |
| if (s->buf_end > s->checksum_ptr) |
| s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, |
| s->buf_end - s->checksum_ptr); |
| s->checksum_ptr = s->buffer; |
| } |
| |
| /* make buffer smaller in case it ended up large after probing */ |
| 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; |
| } |
| av_assert0(len >= s->orig_buffer_size); |
| len = s->orig_buffer_size; |
| } |
| |
| if (s->read_packet) |
| len = s->read_packet(s->opaque, dst, len); |
| else |
| len = 0; |
| if (len <= 0) { |
| /* do not modify buffer if EOF reached so that a seek back can |
| be done without rereading data */ |
| s->eof_reached = 1; |
| if (len < 0) |
| s->error = len; |
| } else { |
| s->pos += len; |
| s->buf_ptr = dst; |
| s->buf_end = dst + len; |
| s->bytes_read += len; |
| } |
| } |
| |
| unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, |
| unsigned int len) |
| { |
| return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len); |
| } |
| |
| unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf, |
| unsigned int len) |
| { |
| return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len); |
| } |
| |
| unsigned long ffio_get_checksum(AVIOContext *s) |
| { |
| s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, |
| s->buf_ptr - s->checksum_ptr); |
| s->update_checksum = NULL; |
| return s->checksum; |
| } |
| |
| void ffio_init_checksum(AVIOContext *s, |
| unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), |
| unsigned long checksum) |
| { |
| s->update_checksum = update_checksum; |
| if (s->update_checksum) { |
| s->checksum = checksum; |
| s->checksum_ptr = s->buf_ptr; |
| } |
| } |
| |
| /* XXX: put an inline version */ |
| int avio_r8(AVIOContext *s) |
| { |
| if (s->buf_ptr >= s->buf_end) |
| fill_buffer(s); |
| if (s->buf_ptr < s->buf_end) |
| return *s->buf_ptr++; |
| return 0; |
| } |
| |
| int avio_read(AVIOContext *s, unsigned char *buf, int size) |
| { |
| int len, size1; |
| |
| size1 = size; |
| while (size > 0) { |
| len = s->buf_end - s->buf_ptr; |
| if (len > size) |
| len = size; |
| if (len == 0 || s->write_flag) { |
| 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) { |
| /* do not modify buffer if EOF reached so that a seek back can |
| be done without rereading data */ |
| s->eof_reached = 1; |
| if(len<0) |
| s->error= len; |
| break; |
| } else { |
| s->pos += len; |
| s->bytes_read += len; |
| size -= len; |
| buf += len; |
| s->buf_ptr = s->buffer; |
| s->buf_end = s->buffer/* + len*/; |
| } |
| } else { |
| fill_buffer(s); |
| len = s->buf_end - s->buf_ptr; |
| if (len == 0) |
| break; |
| } |
| } else { |
| memcpy(buf, s->buf_ptr, len); |
| buf += len; |
| s->buf_ptr += len; |
| size -= len; |
| } |
| } |
| if (size1 == size) { |
| if (s->error) return s->error; |
| if (avio_feof(s)) return AVERROR_EOF; |
| } |
| return size1 - size; |
| } |
| |
| int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data) |
| { |
| if (s->buf_end - s->buf_ptr >= size && !s->write_flag) { |
| *data = s->buf_ptr; |
| s->buf_ptr += size; |
| return size; |
| } else { |
| *data = buf; |
| return avio_read(s, buf, size); |
| } |
| } |
| |
| int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size) |
| { |
| int len; |
| |
| if (size < 0) |
| return -1; |
| |
| if (s->read_packet && s->write_flag) { |
| len = s->read_packet(s->opaque, buf, size); |
| if (len > 0) |
| s->pos += len; |
| return len; |
| } |
| |
| len = s->buf_end - s->buf_ptr; |
| if (len == 0) { |
| /* Reset the buf_end pointer to the start of the buffer, to make sure |
| * the fill_buffer call tries to read as much data as fits into the |
| * full buffer, instead of just what space is left after buf_end. |
| * This avoids returning partial packets at the end of the buffer, |
| * for packet based inputs. |
| */ |
| s->buf_end = s->buf_ptr = s->buffer; |
| fill_buffer(s); |
| len = s->buf_end - s->buf_ptr; |
| } |
| if (len > size) |
| len = size; |
| memcpy(buf, s->buf_ptr, len); |
| s->buf_ptr += len; |
| if (!len) { |
| if (s->error) return s->error; |
| if (avio_feof(s)) return AVERROR_EOF; |
| } |
| return len; |
| } |
| |
| unsigned int avio_rl16(AVIOContext *s) |
| { |
| unsigned int val; |
| val = avio_r8(s); |
| val |= avio_r8(s) << 8; |
| return val; |
| } |
| |
| unsigned int avio_rl24(AVIOContext *s) |
| { |
| unsigned int val; |
| val = avio_rl16(s); |
| val |= avio_r8(s) << 16; |
| return val; |
| } |
| |
| unsigned int avio_rl32(AVIOContext *s) |
| { |
| unsigned int val; |
| val = avio_rl16(s); |
| val |= avio_rl16(s) << 16; |
| return val; |
| } |
| |
| uint64_t avio_rl64(AVIOContext *s) |
| { |
| uint64_t val; |
| val = (uint64_t)avio_rl32(s); |
| val |= (uint64_t)avio_rl32(s) << 32; |
| return val; |
| } |
| |
| unsigned int avio_rb16(AVIOContext *s) |
| { |
| unsigned int val; |
| val = avio_r8(s) << 8; |
| val |= avio_r8(s); |
| return val; |
| } |
| |
| unsigned int avio_rb24(AVIOContext *s) |
| { |
| unsigned int val; |
| val = avio_rb16(s) << 8; |
| val |= avio_r8(s); |
| return val; |
| } |
| unsigned int avio_rb32(AVIOContext *s) |
| { |
| unsigned int val; |
| val = avio_rb16(s) << 16; |
| val |= avio_rb16(s); |
| return val; |
| } |
| |
| int ff_get_line(AVIOContext *s, char *buf, int maxlen) |
| { |
| int i = 0; |
| char c; |
| |
| do { |
| c = avio_r8(s); |
| if (c && i < maxlen-1) |
| buf[i++] = c; |
| } while (c != '\n' && c != '\r' && c); |
| if (c == '\r' && avio_r8(s) != '\n') |
| avio_skip(s, -1); |
| |
| buf[i] = 0; |
| return i; |
| } |
| |
| int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen) |
| { |
| int i; |
| |
| if (buflen <= 0) |
| return AVERROR(EINVAL); |
| // reserve 1 byte for terminating 0 |
| buflen = FFMIN(buflen - 1, maxlen); |
| for (i = 0; i < buflen; i++) |
| if (!(buf[i] = avio_r8(s))) |
| return i + 1; |
| buf[i] = 0; |
| for (; i < maxlen; i++) |
| if (!avio_r8(s)) |
| return i + 1; |
| return maxlen; |
| } |
| |
| #define GET_STR16(type, read) \ |
| int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\ |
| {\ |
| char* q = buf;\ |
| int ret = 0;\ |
| if (buflen <= 0) \ |
| return AVERROR(EINVAL); \ |
| while (ret + 1 < maxlen) {\ |
| uint8_t tmp;\ |
| uint32_t ch;\ |
| GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\ |
| if (!ch)\ |
| break;\ |
| PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\ |
| }\ |
| *q = 0;\ |
| return ret;\ |
| }\ |
| |
| GET_STR16(le, avio_rl16) |
| GET_STR16(be, avio_rb16) |
| |
| #undef GET_STR16 |
| |
| uint64_t avio_rb64(AVIOContext *s) |
| { |
| uint64_t val; |
| val = (uint64_t)avio_rb32(s) << 32; |
| val |= (uint64_t)avio_rb32(s); |
| return val; |
| } |
| |
| uint64_t ffio_read_varlen(AVIOContext *bc){ |
| uint64_t val = 0; |
| int tmp; |
| |
| do{ |
| tmp = avio_r8(bc); |
| val= (val<<7) + (tmp&127); |
| }while(tmp&128); |
| return val; |
| } |
| |
| int ffio_fdopen(AVIOContext **s, URLContext *h) |
| { |
| uint8_t *buffer; |
| int buffer_size, max_packet_size; |
| |
| max_packet_size = h->max_packet_size; |
| if (max_packet_size) { |
| buffer_size = max_packet_size; /* no need to bufferize more than one packet */ |
| } else { |
| buffer_size = IO_BUFFER_SIZE; |
| } |
| buffer = av_malloc(buffer_size); |
| if (!buffer) |
| return AVERROR(ENOMEM); |
| |
| *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h, |
| (void*)ffurl_read, (void*)ffurl_write, (void*)ffurl_seek); |
| if (!*s) { |
| 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) { |
| (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause; |
| (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek; |
| } |
| (*s)->av_class = &ffio_url_class; |
| 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; |
| buffer = av_malloc(buf_size); |
| if (!buffer) |
| return AVERROR(ENOMEM); |
| |
| 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); |
| return 0; |
| } |
| |
| static int url_resetbuf(AVIOContext *s, int flags) |
| { |
| av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ); |
| |
| if (flags & AVIO_FLAG_WRITE) { |
| s->buf_end = s->buffer + s->buffer_size; |
| s->write_flag = 1; |
| } else { |
| s->buf_end = s->buffer; |
| s->write_flag = 0; |
| } |
| return 0; |
| } |
| |
| 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) { |
| 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) { |
| 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 = (*bufp) = av_realloc_f(buf, 1, alloc_size))) |
| return AVERROR(ENOMEM); |
| |
| if (new_size > buf_size) { |
| memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap); |
| buf_size = new_size; |
| } |
| |
| av_free(s->buffer); |
| s->buf_ptr = s->buffer = buf; |
| s->buffer_size = alloc_size; |
| s->pos = buf_size; |
| s->buf_end = s->buf_ptr + buf_size; |
| s->eof_reached = 0; |
| s->must_flush = 0; |
| |
| return 0; |
| } |
| |
| int avio_open(AVIOContext **s, const char *filename, int flags) |
| { |
| return avio_open2(s, filename, flags, NULL, NULL); |
| } |
| |
| int avio_open2(AVIOContext **s, const char *filename, int flags, |
| const AVIOInterruptCB *int_cb, AVDictionary **options) |
| { |
| URLContext *h; |
| int err; |
| |
| err = ffurl_open(&h, filename, flags, int_cb, options); |
| if (err < 0) |
| return err; |
| err = ffio_fdopen(s, h); |
| if (err < 0) { |
| ffurl_close(h); |
| return err; |
| } |
| return 0; |
| } |
| |
| int avio_close(AVIOContext *s) |
| { |
| URLContext *h; |
| |
| if (!s) |
| return 0; |
| |
| 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); |
| } |
| |
| int avio_closep(AVIOContext **s) |
| { |
| int ret = avio_close(*s); |
| *s = NULL; |
| return ret; |
| } |
| |
| int avio_printf(AVIOContext *s, const char *fmt, ...) |
| { |
| va_list ap; |
| char buf[4096]; |
| int ret; |
| |
| va_start(ap, fmt); |
| ret = vsnprintf(buf, sizeof(buf), fmt, ap); |
| va_end(ap); |
| avio_write(s, buf, strlen(buf)); |
| return ret; |
| } |
| |
| int avio_pause(AVIOContext *s, int pause) |
| { |
| if (!s->read_pause) |
| return AVERROR(ENOSYS); |
| return s->read_pause(s->opaque, pause); |
| } |
| |
| int64_t avio_seek_time(AVIOContext *s, int stream_index, |
| int64_t timestamp, int flags) |
| { |
| URLContext *h = s->opaque; |
| int64_t ret; |
| if (!s->read_seek) |
| return AVERROR(ENOSYS); |
| ret = s->read_seek(h, stream_index, timestamp, flags); |
| if (ret >= 0) { |
| int64_t pos; |
| s->buf_ptr = s->buf_end; // Flush buffer |
| pos = s->seek(h, 0, SEEK_CUR); |
| if (pos >= 0) |
| s->pos = pos; |
| else if (pos != AVERROR(ENOSYS)) |
| ret = pos; |
| } |
| 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 { |
| int pos, size, allocated_size; |
| uint8_t *buffer; |
| int io_buffer_size; |
| uint8_t io_buffer[1]; |
| } DynBuffer; |
| |
| static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size) |
| { |
| DynBuffer *d = opaque; |
| unsigned new_size, new_allocated_size; |
| |
| /* reallocate buffer if needed */ |
| new_size = d->pos + buf_size; |
| new_allocated_size = d->allocated_size; |
| if (new_size < d->pos || new_size > INT_MAX/2) |
| return -1; |
| while (new_size > new_allocated_size) { |
| if (!new_allocated_size) |
| new_allocated_size = new_size; |
| else |
| new_allocated_size += new_allocated_size / 2 + 1; |
| } |
| |
| if (new_allocated_size > d->allocated_size) { |
| int err; |
| if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) { |
| d->allocated_size = 0; |
| d->size = 0; |
| return err; |
| } |
| d->allocated_size = new_allocated_size; |
| } |
| memcpy(d->buffer + d->pos, buf, buf_size); |
| d->pos = new_size; |
| if (d->pos > d->size) |
| d->size = d->pos; |
| return buf_size; |
| } |
| |
| static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size) |
| { |
| unsigned char buf1[4]; |
| int ret; |
| |
| /* packetized write: output the header */ |
| AV_WB32(buf1, buf_size); |
| ret = dyn_buf_write(opaque, buf1, 4); |
| if (ret < 0) |
| return ret; |
| |
| /* then the data */ |
| return dyn_buf_write(opaque, buf, buf_size); |
| } |
| |
| static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence) |
| { |
| DynBuffer *d = opaque; |
| |
| if (whence == SEEK_CUR) |
| offset += d->pos; |
| else if (whence == SEEK_END) |
| offset += d->size; |
| if (offset < 0 || offset > 0x7fffffffLL) |
| return -1; |
| d->pos = offset; |
| return 0; |
| } |
| |
| static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size) |
| { |
| DynBuffer *d; |
| unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024; |
| |
| if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size) |
| return -1; |
| d = av_mallocz(sizeof(DynBuffer) + io_buffer_size); |
| if (!d) |
| return AVERROR(ENOMEM); |
| d->io_buffer_size = io_buffer_size; |
| *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL, |
| max_packet_size ? dyn_packet_buf_write : dyn_buf_write, |
| max_packet_size ? NULL : dyn_buf_seek); |
| if(!*s) { |
| av_free(d); |
| return AVERROR(ENOMEM); |
| } |
| (*s)->max_packet_size = max_packet_size; |
| return 0; |
| } |
| |
| int avio_open_dyn_buf(AVIOContext **s) |
| { |
| return url_open_dyn_buf_internal(s, 0); |
| } |
| |
| int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size) |
| { |
| if (max_packet_size <= 0) |
| return -1; |
| return url_open_dyn_buf_internal(s, max_packet_size); |
| } |
| |
| int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer) |
| { |
| DynBuffer *d; |
| int size; |
| static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0}; |
| int padding = 0; |
| |
| if (!s) { |
| *pbuffer = NULL; |
| return 0; |
| } |
| d = s->opaque; |
| |
| /* don't attempt to pad fixed-size packet buffers */ |
| if (!s->max_packet_size) { |
| avio_write(s, padbuf, sizeof(padbuf)); |
| padding = FF_INPUT_BUFFER_PADDING_SIZE; |
| } |
| |
| avio_flush(s); |
| |
| *pbuffer = d->buffer; |
| size = d->size; |
| av_free(d); |
| av_free(s); |
| return size - padding; |
| } |
| |
| static int null_buf_write(void *opaque, uint8_t *buf, int buf_size) |
| { |
| DynBuffer *d = opaque; |
| |
| d->pos += buf_size; |
| if (d->pos > d->size) |
| d->size = d->pos; |
| return buf_size; |
| } |
| |
| int ffio_open_null_buf(AVIOContext **s) |
| { |
| int ret = url_open_dyn_buf_internal(s, 0); |
| if (ret >= 0) { |
| AVIOContext *pb = *s; |
| pb->write_packet = null_buf_write; |
| } |
| return ret; |
| } |
| |
| int ffio_close_null_buf(AVIOContext *s) |
| { |
| DynBuffer *d = s->opaque; |
| int size; |
| |
| avio_flush(s); |
| |
| size = d->size; |
| av_free(d); |
| av_free(s); |
| return size; |
| } |