| /* |
| * 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 32768 |
| |
| static void *ff_avio_child_next(void *obj, void *prev) |
| { |
| AVIOContext *s = obj; |
| return prev ? NULL : s->opaque; |
| } |
| |
| #if FF_API_CHILD_CLASS_NEXT |
| static const AVClass *ff_avio_child_class_next(const AVClass *prev) |
| { |
| return prev ? NULL : &ffurl_context_class; |
| } |
| #endif |
| |
| static const AVClass *child_class_iterate(void **iter) |
| { |
| const AVClass *c = *iter ? NULL : &ffurl_context_class; |
| *iter = (void*)(uintptr_t)c; |
| return c; |
| } |
| |
| #define OFFSET(x) offsetof(AVIOContext,x) |
| #define E AV_OPT_FLAG_ENCODING_PARAM |
| #define D AV_OPT_FLAG_DECODING_PARAM |
| static const AVOption ff_avio_options[] = { |
| {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D }, |
| { NULL }, |
| }; |
| |
| const AVClass ff_avio_class = { |
| .class_name = "AVIOContext", |
| .item_name = av_default_item_name, |
| .version = LIBAVUTIL_VERSION_INT, |
| .option = ff_avio_options, |
| .child_next = ff_avio_child_next, |
| #if FF_API_CHILD_CLASS_NEXT |
| .child_class_next = ff_avio_child_class_next, |
| #endif |
| .child_class_iterate = child_class_iterate, |
| }; |
| |
| 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)) |
| { |
| memset(s, 0, sizeof(AVIOContext)); |
| |
| s->buffer = buffer; |
| s->orig_buffer_size = |
| s->buffer_size = buffer_size; |
| s->buf_ptr = buffer; |
| s->buf_ptr_max = 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->eof_reached = 0; |
| s->error = 0; |
| s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0; |
| s->min_packet_size = 0; |
| s->max_packet_size = 0; |
| s->update_checksum = NULL; |
| s->short_seek_threshold = SHORT_SEEK_THRESHOLD; |
| |
| if (!read_packet && !write_flag) { |
| s->pos = buffer_size; |
| s->buf_end = s->buffer + buffer_size; |
| } |
| s->read_pause = NULL; |
| s->read_seek = NULL; |
| |
| s->write_data_type = NULL; |
| s->ignore_boundary_point = 0; |
| s->current_type = AVIO_DATA_MARKER_UNKNOWN; |
| s->last_time = AV_NOPTS_VALUE; |
| s->short_seek_get = NULL; |
| s->written = 0; |
| |
| 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_malloc(sizeof(AVIOContext)); |
| if (!s) |
| return NULL; |
| ffio_init_context(s, buffer, buffer_size, write_flag, opaque, |
| read_packet, write_packet, seek); |
| return s; |
| } |
| |
| void avio_context_free(AVIOContext **ps) |
| { |
| av_freep(ps); |
| } |
| |
| static void writeout(AVIOContext *s, const uint8_t *data, int len) |
| { |
| if (!s->error) { |
| int ret = 0; |
| if (s->write_data_type) |
| ret = s->write_data_type(s->opaque, (uint8_t *)data, |
| len, |
| s->current_type, |
| s->last_time); |
| else if (s->write_packet) |
| ret = s->write_packet(s->opaque, (uint8_t *)data, len); |
| if (ret < 0) { |
| s->error = ret; |
| } else { |
| if (s->pos + len > s->written) |
| s->written = s->pos + len; |
| } |
| } |
| if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT || |
| s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) { |
| s->current_type = AVIO_DATA_MARKER_UNKNOWN; |
| } |
| s->last_time = AV_NOPTS_VALUE; |
| s->writeout_count ++; |
| s->pos += len; |
| } |
| |
| static void flush_buffer(AVIOContext *s) |
| { |
| s->buf_ptr_max = FFMAX(s->buf_ptr, s->buf_ptr_max); |
| if (s->write_flag && s->buf_ptr_max > s->buffer) { |
| writeout(s, s->buffer, s->buf_ptr_max - s->buffer); |
| if (s->update_checksum) { |
| s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, |
| s->buf_ptr_max - s->checksum_ptr); |
| s->checksum_ptr = s->buffer; |
| } |
| } |
| s->buf_ptr = s->buf_ptr_max = 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); |
| } |
| |
| 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) |
| { |
| int seekback = s->write_flag ? FFMIN(0, s->buf_ptr - s->buf_ptr_max) : 0; |
| flush_buffer(s); |
| if (seekback) |
| avio_seek(s, seekback, SEEK_CUR); |
| } |
| |
| 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; |
| int short_seek; |
| whence &= ~AVSEEK_FORCE; |
| |
| if(!s) |
| return AVERROR(EINVAL); |
| |
| if ((whence & AVSEEK_SIZE)) |
| return s->seek ? s->seek(s->opaque, offset, AVSEEK_SIZE) : AVERROR(ENOSYS); |
| |
| buffer_size = s->buf_end - s->buffer; |
| // pos is the absolute position that the beginning of s->buffer corresponds to in the file |
| 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; |
| if (offset > INT64_MAX - offset1) |
| return AVERROR(EINVAL); |
| offset += offset1; |
| } |
| if (offset < 0) |
| return AVERROR(EINVAL); |
| |
| if (s->short_seek_get) { |
| short_seek = s->short_seek_get(s->opaque); |
| /* fallback to default short seek */ |
| if (short_seek <= 0) |
| short_seek = s->short_seek_threshold; |
| } else |
| short_seek = s->short_seek_threshold; |
| |
| offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer |
| s->buf_ptr_max = FFMAX(s->buf_ptr_max, s->buf_ptr); |
| if ((!s->direct || !s->seek) && |
| offset1 >= 0 && offset1 <= (s->write_flag ? s->buf_ptr_max - s->buffer : buffer_size)) { |
| /* can do the seek inside the buffer */ |
| s->buf_ptr = s->buffer + offset1; |
| } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) || |
| offset1 <= buffer_size + short_seek) && |
| !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 - (s->pos - offset); |
| } 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); |
| } |
| 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->buf_ptr_max = 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->written) |
| return s->written; |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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++, 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, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le"); |
| err = AVERROR(EINVAL); |
| if (!*(q-1)) |
| break; |
| } |
| 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 |
| |
| 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); |
| } |
| |
| void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type) |
| { |
| if (type == AVIO_DATA_MARKER_FLUSH_POINT) { |
| if (s->buf_ptr - s->buffer >= s->min_packet_size) |
| avio_flush(s); |
| return; |
| } |
| if (!s->write_data_type) |
| return; |
| // If ignoring boundary points, just treat it as unknown |
| if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point) |
| type = AVIO_DATA_MARKER_UNKNOWN; |
| // Avoid unnecessary flushes if we are already in non-header/trailer |
| // data and setting the type to unknown |
| if (type == AVIO_DATA_MARKER_UNKNOWN && |
| (s->current_type != AVIO_DATA_MARKER_HEADER && |
| s->current_type != AVIO_DATA_MARKER_TRAILER)) |
| return; |
| |
| switch (type) { |
| case AVIO_DATA_MARKER_HEADER: |
| case AVIO_DATA_MARKER_TRAILER: |
| // For header/trailer, ignore a new marker of the same type; |
| // consecutive header/trailer markers can be merged. |
| if (type == s->current_type) |
| return; |
| break; |
| } |
| |
| // If we've reached here, we have a new, noteworthy marker. |
| // Flush the previous data and mark the start of the new data. |
| avio_flush(s); |
| s->current_type = type; |
| s->last_time = time; |
| } |
| |
| static int read_packet_wrapper(AVIOContext *s, uint8_t *buf, int size) |
| { |
| int ret; |
| |
| if (!s->read_packet) |
| return AVERROR(EINVAL); |
| ret = s->read_packet(s->opaque, buf, size); |
| #if FF_API_OLD_AVIO_EOF_0 |
| if (!ret && !s->max_packet_size) { |
| av_log(NULL, AV_LOG_WARNING, "Invalid return value 0 for stream protocol\n"); |
| ret = AVERROR_EOF; |
| } |
| #else |
| av_assert2(ret || s->max_packet_size); |
| #endif |
| return ret; |
| } |
| |
| /* 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 && len >= s->orig_buffer_size) { |
| if (dst == s->buffer && s->buf_ptr != dst) { |
| int ret = ffio_set_buf_size(s, s->orig_buffer_size); |
| if (ret < 0) |
| av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n"); |
| |
| s->checksum_ptr = dst = s->buffer; |
| } |
| len = s->orig_buffer_size; |
| } |
| |
| len = read_packet_wrapper(s, dst, len); |
| if (len == AVERROR_EOF) { |
| /* do not modify buffer if EOF reached so that a seek back can |
| be done without rereading data */ |
| s->eof_reached = 1; |
| } else if (len < 0) { |
| s->eof_reached = 1; |
| 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_crcEDB88320_update(unsigned long checksum, const uint8_t *buf, |
| unsigned int len) |
| { |
| return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), 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 = FFMIN(s->buf_end - s->buf_ptr, size); |
| if (len == 0 || s->write_flag) { |
| if((s->direct || size > s->buffer_size) && !s->update_checksum) { |
| // bypass the buffer and read data directly into buf |
| len = read_packet_wrapper(s, buf, size); |
| if (len == AVERROR_EOF) { |
| /* do not modify buffer if EOF reached so that a seek back can |
| be done without rereading data */ |
| s->eof_reached = 1; |
| break; |
| } else if (len < 0) { |
| s->eof_reached = 1; |
| s->error= len; |
| break; |
| } else { |
| s->pos += len; |
| s->bytes_read += len; |
| size -= len; |
| buf += len; |
| // reset the buffer |
| 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_size(AVIOContext *s, unsigned char *buf, int size) |
| { |
| int ret = avio_read(s, buf, size); |
| if (ret == size) |
| return ret; |
| if (ret < 0 && ret != AVERROR_EOF) |
| return ret; |
| return AVERROR_INVALIDDATA; |
| } |
| |
| 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 avio_read_partial(AVIOContext *s, unsigned char *buf, int size) |
| { |
| int len; |
| |
| if (size < 0) |
| return AVERROR(EINVAL); |
| |
| if (s->read_packet && s->write_flag) { |
| len = read_packet_wrapper(s, buf, size); |
| if (len > 0) |
| s->pos += len; |
| return len; |
| } |
| |
| len = s->buf_end - s->buf_ptr; |
| if (len == 0) { |
| 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_feof(s)) |
| avio_skip(s, -1); |
| |
| buf[i] = 0; |
| return i; |
| } |
| |
| int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen) |
| { |
| int len = ff_get_line(s, buf, maxlen); |
| while (len > 0 && av_isspace(buf[len - 1])) |
| buf[--len] = '\0'; |
| return len; |
| } |
| |
| int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp) |
| { |
| int len, end; |
| int64_t read = 0; |
| char tmp[1024]; |
| char c; |
| |
| do { |
| len = 0; |
| do { |
| c = avio_r8(s); |
| end = (c == '\r' || c == '\n' || c == '\0'); |
| if (!end) |
| tmp[len++] = c; |
| } while (!end && len < sizeof(tmp)); |
| av_bprint_append_data(bp, tmp, len); |
| read += len; |
| } while (!end); |
| |
| if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s)) |
| avio_skip(s, -1); |
| |
| if (!c && s->error) |
| return s->error; |
| |
| if (!c && !read && avio_feof(s)) |
| return AVERROR_EOF; |
| |
| return read; |
| } |
| |
| int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp) |
| { |
| int64_t ret; |
| |
| av_bprint_clear(bp); |
| ret = ff_read_line_to_bprint(s, bp); |
| if (ret < 0) |
| return ret; |
| |
| if (!av_bprint_is_complete(bp)) |
| return AVERROR(ENOMEM); |
| |
| return bp->len; |
| } |
| |
| 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 = NULL; |
| 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; |
| } |
| if (!(h->flags & AVIO_FLAG_WRITE) && h->is_streamed) { |
| if (buffer_size > INT_MAX/2) |
| return AVERROR(EINVAL); |
| buffer_size *= 2; |
| } |
| buffer = av_malloc(buffer_size); |
| if (!buffer) |
| return AVERROR(ENOMEM); |
| |
| *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h, |
| (int (*)(void *, uint8_t *, int)) ffurl_read, |
| (int (*)(void *, uint8_t *, int)) ffurl_write, |
| (int64_t (*)(void *, int64_t, int))ffurl_seek); |
| if (!*s) |
| goto fail; |
| |
| (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist); |
| if (!(*s)->protocol_whitelist && h->protocol_whitelist) { |
| avio_closep(s); |
| goto fail; |
| } |
| (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist); |
| if (!(*s)->protocol_blacklist && h->protocol_blacklist) { |
| avio_closep(s); |
| goto fail; |
| } |
| (*s)->direct = h->flags & AVIO_FLAG_DIRECT; |
| |
| (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL; |
| (*s)->max_packet_size = max_packet_size; |
| (*s)->min_packet_size = h->min_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; |
| |
| if (h->prot->url_read_seek) |
| (*s)->seekable |= AVIO_SEEKABLE_TIME; |
| } |
| (*s)->short_seek_get = (int (*)(void *))ffurl_get_short_seek; |
| (*s)->av_class = &ff_avio_class; |
| return 0; |
| fail: |
| av_freep(&buffer); |
| return AVERROR(ENOMEM); |
| } |
| |
| URLContext* ffio_geturlcontext(AVIOContext *s) |
| { |
| if (!s) |
| return NULL; |
| |
| if (s->opaque && s->read_packet == (int (*)(void *, uint8_t *, int))ffurl_read) |
| return s->opaque; |
| else |
| return NULL; |
| } |
| |
| static void update_checksum(AVIOContext *s) |
| { |
| if (s->update_checksum && s->buf_ptr > s->checksum_ptr) { |
| s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, |
| s->buf_ptr - s->checksum_ptr); |
| } |
| } |
| |
| 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; |
| ptrdiff_t filled = s->buf_end - s->buf_ptr; |
| |
| if (buf_size <= s->buf_end - s->buf_ptr) |
| return 0; |
| |
| buf_size += max_buffer_size - 1; |
| |
| if (buf_size + s->buf_ptr - s->buffer <= s->buffer_size || s->seekable || !s->read_packet) |
| return 0; |
| av_assert0(!s->write_flag); |
| |
| if (buf_size <= s->buffer_size) { |
| update_checksum(s); |
| memmove(s->buffer, s->buf_ptr, filled); |
| } else { |
| buffer = av_malloc(buf_size); |
| if (!buffer) |
| return AVERROR(ENOMEM); |
| update_checksum(s); |
| memcpy(buffer, s->buf_ptr, filled); |
| av_free(s->buffer); |
| s->buffer = buffer; |
| s->buffer_size = buf_size; |
| } |
| s->buf_ptr = s->buffer; |
| s->buf_end = s->buffer + filled; |
| s->checksum_ptr = s->buffer; |
| 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 = s->buf_ptr_max = buffer; |
| url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ); |
| return 0; |
| } |
| |
| int ffio_realloc_buf(AVIOContext *s, int buf_size) |
| { |
| uint8_t *buffer; |
| int data_size; |
| |
| if (!s->buffer_size) |
| return ffio_set_buf_size(s, buf_size); |
| |
| if (buf_size <= s->buffer_size) |
| return 0; |
| |
| buffer = av_malloc(buf_size); |
| if (!buffer) |
| return AVERROR(ENOMEM); |
| |
| data_size = s->write_flag ? (s->buf_ptr - s->buffer) : (s->buf_end - s->buf_ptr); |
| if (data_size > 0) |
| memcpy(buffer, s->write_flag ? s->buffer : s->buf_ptr, data_size); |
| av_free(s->buffer); |
| s->buffer = buffer; |
| s->orig_buffer_size = buf_size; |
| s->buffer_size = buf_size; |
| s->buf_ptr = s->write_flag ? (s->buffer + data_size) : s->buffer; |
| if (s->write_flag) |
| s->buf_ptr_max = s->buffer + data_size; |
| |
| s->buf_end = s->write_flag ? (s->buffer + s->buffer_size) : (s->buf_ptr + data_size); |
| |
| 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; |
| |
| return 0; |
| } |
| |
| int avio_open(AVIOContext **s, const char *filename, int flags) |
| { |
| return avio_open2(s, filename, flags, NULL, NULL); |
| } |
| |
| int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags, |
| const AVIOInterruptCB *int_cb, AVDictionary **options, |
| const char *whitelist, const char *blacklist |
| ) |
| { |
| URLContext *h; |
| int err; |
| |
| *s = NULL; |
| |
| err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL); |
| if (err < 0) |
| return err; |
| err = ffio_fdopen(s, h); |
| if (err < 0) { |
| ffurl_close(h); |
| return err; |
| } |
| return 0; |
| } |
| |
| int avio_open2(AVIOContext **s, const char *filename, int flags, |
| const AVIOInterruptCB *int_cb, AVDictionary **options) |
| { |
| return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL); |
| } |
| |
| int avio_close(AVIOContext *s) |
| { |
| URLContext *h; |
| |
| if (!s) |
| return 0; |
| |
| avio_flush(s); |
| h = s->opaque; |
| s->opaque = NULL; |
| |
| av_freep(&s->buffer); |
| if (s->write_flag) |
| av_log(s, AV_LOG_VERBOSE, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count); |
| else |
| av_log(s, AV_LOG_VERBOSE, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count); |
| av_opt_free(s); |
| |
| avio_context_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; |
| AVBPrint bp; |
| |
| av_bprint_init(&bp, 0, INT_MAX); |
| va_start(ap, fmt); |
| av_vbprintf(&bp, fmt, ap); |
| va_end(ap); |
| if (!av_bprint_is_complete(&bp)) { |
| av_bprint_finalize(&bp, NULL); |
| s->error = AVERROR(ENOMEM); |
| return AVERROR(ENOMEM); |
| } |
| avio_write(s, bp.str, bp.len); |
| av_bprint_finalize(&bp, NULL); |
| return bp.len; |
| } |
| |
| void avio_print_string_array(AVIOContext *s, const char *strings[]) |
| { |
| for(; *strings; strings++) |
| avio_write(s, (const unsigned char *)*strings, strlen(*strings)); |
| } |
| |
| 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) |
| { |
| int64_t ret; |
| if (!s->read_seek) |
| return AVERROR(ENOSYS); |
| ret = s->read_seek(s->opaque, stream_index, timestamp, flags); |
| if (ret >= 0) { |
| int64_t pos; |
| s->buf_ptr = s->buf_end; // Flush buffer |
| pos = s->seek(s->opaque, 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; |
| } |
| |
| int avio_accept(AVIOContext *s, AVIOContext **c) |
| { |
| int ret; |
| URLContext *sc = s->opaque; |
| URLContext *cc = NULL; |
| ret = ffurl_accept(sc, &cc); |
| if (ret < 0) |
| return ret; |
| return ffio_fdopen(c, cc); |
| } |
| |
| int avio_handshake(AVIOContext *c) |
| { |
| URLContext *cc = c->opaque; |
| return ffurl_handshake(cc); |
| } |
| |
| /* 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; |
| |
| /* reallocate buffer if needed */ |
| new_size = (unsigned)d->pos + buf_size; |
| if (new_size < d->pos || new_size > INT_MAX) |
| return AVERROR(ERANGE); |
| if (new_size > d->allocated_size) { |
| unsigned new_allocated_size = d->allocated_size ? d->allocated_size |
| : new_size; |
| int err; |
| while (new_size > new_allocated_size) |
| new_allocated_size += new_allocated_size / 2 + 1; |
| |
| new_allocated_size = FFMIN(new_allocated_size, INT_MAX); |
| |
| 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) |
| return AVERROR(EINVAL); |
| if (offset > INT_MAX) |
| return AVERROR(ERANGE); |
| 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 AVERROR(ERANGE); |
| 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 AVERROR(EINVAL); |
| return url_open_dyn_buf_internal(s, max_packet_size); |
| } |
| |
| int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer) |
| { |
| DynBuffer *d; |
| |
| if (!s) { |
| *pbuffer = NULL; |
| return 0; |
| } |
| d = s->opaque; |
| |
| if (!s->error && !d->size) { |
| *pbuffer = d->io_buffer; |
| return FFMAX(s->buf_ptr, s->buf_ptr_max) - s->buffer; |
| } |
| |
| avio_flush(s); |
| |
| *pbuffer = d->buffer; |
| |
| return d->size; |
| } |
| |
| void ffio_reset_dyn_buf(AVIOContext *s) |
| { |
| DynBuffer *d = s->opaque; |
| int max_packet_size = s->max_packet_size; |
| |
| ffio_init_context(s, d->io_buffer, d->io_buffer_size, 1, d, NULL, |
| s->write_packet, s->seek); |
| s->max_packet_size = max_packet_size; |
| d->pos = d->size = 0; |
| } |
| |
| int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer) |
| { |
| DynBuffer *d; |
| int size; |
| static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0}; |
| int padding = 0; |
| |
| if (!s) { |
| *pbuffer = NULL; |
| return 0; |
| } |
| |
| /* don't attempt to pad fixed-size packet buffers */ |
| if (!s->max_packet_size) { |
| avio_write(s, padbuf, sizeof(padbuf)); |
| padding = AV_INPUT_BUFFER_PADDING_SIZE; |
| } |
| |
| avio_flush(s); |
| |
| d = s->opaque; |
| *pbuffer = d->buffer; |
| size = d->size; |
| av_free(d); |
| |
| avio_context_free(&s); |
| |
| return size - padding; |
| } |
| |
| void ffio_free_dyn_buf(AVIOContext **s) |
| { |
| DynBuffer *d; |
| |
| if (!*s) |
| return; |
| |
| d = (*s)->opaque; |
| av_free(d->buffer); |
| av_free(d); |
| avio_context_free(s); |
| } |
| |
| 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); |
| |
| avio_context_free(&s); |
| |
| return size; |
| } |