| /* |
| * Buffered I/O for ffmpeg system |
| * 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/crc.h" |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "avio.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 fill_buffer(ByteIOContext *s); |
| |
| int init_put_byte(ByteIOContext *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->buffer_size = buffer_size; |
| s->buf_ptr = buffer; |
| s->opaque = opaque; |
| url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY); |
| 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->is_streamed = 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; |
| } |
| |
| ByteIOContext *av_alloc_put_byte( |
| 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)) |
| { |
| ByteIOContext *s = av_mallocz(sizeof(ByteIOContext)); |
| init_put_byte(s, buffer, buffer_size, write_flag, opaque, |
| read_packet, write_packet, seek); |
| return s; |
| } |
| |
| static void flush_buffer(ByteIOContext *s) |
| { |
| 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->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; |
| } |
| |
| void put_byte(ByteIOContext *s, int b) |
| { |
| *(s->buf_ptr)++ = b; |
| if (s->buf_ptr >= s->buf_end) |
| flush_buffer(s); |
| } |
| |
| void put_buffer(ByteIOContext *s, const unsigned char *buf, int size) |
| { |
| int len; |
| |
| while (size > 0) { |
| len = (s->buf_end - s->buf_ptr); |
| if (len > size) |
| len = 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 put_flush_packet(ByteIOContext *s) |
| { |
| flush_buffer(s); |
| s->must_flush = 0; |
| } |
| |
| int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence) |
| { |
| int64_t offset1; |
| int64_t pos; |
| |
| if(!s) |
| return AVERROR(EINVAL); |
| |
| pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer)); |
| |
| 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 && |
| offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) { |
| /* can do the seek inside the buffer */ |
| s->buf_ptr = s->buffer + offset1; |
| } else if ((s->is_streamed || |
| offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) && |
| !s->write_flag && offset1 >= 0) { |
| while(s->pos < offset && !s->eof_reached) |
| fill_buffer(s); |
| if (s->eof_reached) |
| return AVERROR(EPIPE); |
| s->buf_ptr = s->buf_end + offset - s->pos; |
| } else { |
| int64_t res = AVERROR(EPIPE); |
| |
| #if CONFIG_MUXERS || CONFIG_NETWORK |
| if (s->write_flag) { |
| flush_buffer(s); |
| s->must_flush = 1; |
| } |
| #endif /* CONFIG_MUXERS || CONFIG_NETWORK */ |
| if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0) |
| return res; |
| if (!s->write_flag) |
| s->buf_end = s->buffer; |
| s->buf_ptr = s->buffer; |
| s->pos = offset; |
| } |
| s->eof_reached = 0; |
| return offset; |
| } |
| |
| void url_fskip(ByteIOContext *s, int64_t offset) |
| { |
| url_fseek(s, offset, SEEK_CUR); |
| } |
| |
| int64_t url_ftell(ByteIOContext *s) |
| { |
| return url_fseek(s, 0, SEEK_CUR); |
| } |
| |
| int64_t url_fsize(ByteIOContext *s) |
| { |
| int64_t size; |
| |
| if(!s) |
| return AVERROR(EINVAL); |
| |
| if (!s->seek) |
| return AVERROR(EPIPE); |
| 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 url_feof(ByteIOContext *s) |
| { |
| if(!s) |
| return 0; |
| return s->eof_reached; |
| } |
| |
| int url_ferror(ByteIOContext *s) |
| { |
| if(!s) |
| return 0; |
| return s->error; |
| } |
| |
| void put_le32(ByteIOContext *s, unsigned int val) |
| { |
| put_byte(s, val); |
| put_byte(s, val >> 8); |
| put_byte(s, val >> 16); |
| put_byte(s, val >> 24); |
| } |
| |
| void put_be32(ByteIOContext *s, unsigned int val) |
| { |
| put_byte(s, val >> 24); |
| put_byte(s, val >> 16); |
| put_byte(s, val >> 8); |
| put_byte(s, val); |
| } |
| |
| void put_strz(ByteIOContext *s, const char *str) |
| { |
| if (str) |
| put_buffer(s, (const unsigned char *) str, strlen(str) + 1); |
| else |
| put_byte(s, 0); |
| } |
| |
| void put_le64(ByteIOContext *s, uint64_t val) |
| { |
| put_le32(s, (uint32_t)(val & 0xffffffff)); |
| put_le32(s, (uint32_t)(val >> 32)); |
| } |
| |
| void put_be64(ByteIOContext *s, uint64_t val) |
| { |
| put_be32(s, (uint32_t)(val >> 32)); |
| put_be32(s, (uint32_t)(val & 0xffffffff)); |
| } |
| |
| void put_le16(ByteIOContext *s, unsigned int val) |
| { |
| put_byte(s, val); |
| put_byte(s, val >> 8); |
| } |
| |
| void put_be16(ByteIOContext *s, unsigned int val) |
| { |
| put_byte(s, val >> 8); |
| put_byte(s, val); |
| } |
| |
| void put_le24(ByteIOContext *s, unsigned int val) |
| { |
| put_le16(s, val & 0xffff); |
| put_byte(s, val >> 16); |
| } |
| |
| void put_be24(ByteIOContext *s, unsigned int val) |
| { |
| put_be16(s, val >> 8); |
| put_byte(s, val); |
| } |
| |
| void put_tag(ByteIOContext *s, const char *tag) |
| { |
| while (*tag) { |
| put_byte(s, *tag++); |
| } |
| } |
| |
| /* Input stream */ |
| |
| static void fill_buffer(ByteIOContext *s) |
| { |
| uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer; |
| int len= s->buffer_size - (dst - s->buffer); |
| |
| assert(s->buf_ptr == s->buf_end); |
| |
| /* 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; |
| } |
| |
| 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; |
| } |
| } |
| |
| 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 get_checksum(ByteIOContext *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 init_checksum(ByteIOContext *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 get_byte(ByteIOContext *s) |
| { |
| if (s->buf_ptr < s->buf_end) { |
| return *s->buf_ptr++; |
| } else { |
| fill_buffer(s); |
| if (s->buf_ptr < s->buf_end) |
| return *s->buf_ptr++; |
| else |
| return 0; |
| } |
| } |
| |
| int url_fgetc(ByteIOContext *s) |
| { |
| if (s->buf_ptr < s->buf_end) { |
| return *s->buf_ptr++; |
| } else { |
| fill_buffer(s); |
| if (s->buf_ptr < s->buf_end) |
| return *s->buf_ptr++; |
| else |
| return URL_EOF; |
| } |
| } |
| |
| int get_buffer(ByteIOContext *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) { |
| if(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; |
| 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; |
| } |
| } |
| return size1 - size; |
| } |
| |
| int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size) |
| { |
| int len; |
| |
| if(size<0) |
| return -1; |
| |
| 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; |
| return len; |
| } |
| |
| unsigned int get_le16(ByteIOContext *s) |
| { |
| unsigned int val; |
| val = get_byte(s); |
| val |= get_byte(s) << 8; |
| return val; |
| } |
| |
| unsigned int get_le24(ByteIOContext *s) |
| { |
| unsigned int val; |
| val = get_le16(s); |
| val |= get_byte(s) << 16; |
| return val; |
| } |
| |
| unsigned int get_le32(ByteIOContext *s) |
| { |
| unsigned int val; |
| val = get_le16(s); |
| val |= get_le16(s) << 16; |
| return val; |
| } |
| |
| uint64_t get_le64(ByteIOContext *s) |
| { |
| uint64_t val; |
| val = (uint64_t)get_le32(s); |
| val |= (uint64_t)get_le32(s) << 32; |
| return val; |
| } |
| |
| unsigned int get_be16(ByteIOContext *s) |
| { |
| unsigned int val; |
| val = get_byte(s) << 8; |
| val |= get_byte(s); |
| return val; |
| } |
| |
| unsigned int get_be24(ByteIOContext *s) |
| { |
| unsigned int val; |
| val = get_be16(s) << 8; |
| val |= get_byte(s); |
| return val; |
| } |
| unsigned int get_be32(ByteIOContext *s) |
| { |
| unsigned int val; |
| val = get_be16(s) << 16; |
| val |= get_be16(s); |
| return val; |
| } |
| |
| char *get_strz(ByteIOContext *s, char *buf, int maxlen) |
| { |
| int i = 0; |
| char c; |
| |
| while ((c = get_byte(s))) { |
| if (i < maxlen-1) |
| buf[i++] = c; |
| } |
| |
| buf[i] = 0; /* Ensure null terminated, but may be truncated */ |
| |
| return buf; |
| } |
| |
| uint64_t get_be64(ByteIOContext *s) |
| { |
| uint64_t val; |
| val = (uint64_t)get_be32(s) << 32; |
| val |= (uint64_t)get_be32(s); |
| return val; |
| } |
| |
| uint64_t ff_get_v(ByteIOContext *bc){ |
| uint64_t val = 0; |
| int tmp; |
| |
| do{ |
| tmp = get_byte(bc); |
| val= (val<<7) + (tmp&127); |
| }while(tmp&128); |
| return val; |
| } |
| |
| int url_fdopen(ByteIOContext **s, URLContext *h) |
| { |
| uint8_t *buffer; |
| int buffer_size, max_packet_size; |
| |
| |
| max_packet_size = url_get_max_packet_size(h); |
| 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 = av_mallocz(sizeof(ByteIOContext)); |
| if(!*s) { |
| av_free(buffer); |
| return AVERROR(ENOMEM); |
| } |
| |
| if (init_put_byte(*s, buffer, buffer_size, |
| (h->flags & URL_WRONLY || h->flags & URL_RDWR), h, |
| url_read, url_write, url_seek) < 0) { |
| av_free(buffer); |
| av_freep(s); |
| return AVERROR(EIO); |
| } |
| (*s)->is_streamed = h->is_streamed; |
| (*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; |
| } |
| return 0; |
| } |
| |
| int url_setbufsize(ByteIOContext *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->buffer_size = buf_size; |
| s->buf_ptr = buffer; |
| url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY); |
| return 0; |
| } |
| |
| int url_resetbuf(ByteIOContext *s, int flags) |
| { |
| URLContext *h = s->opaque; |
| if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR)) |
| return AVERROR(EINVAL); |
| |
| if (flags & URL_WRONLY) { |
| 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 url_fopen(ByteIOContext **s, const char *filename, int flags) |
| { |
| URLContext *h; |
| int err; |
| |
| err = url_open(&h, filename, flags); |
| if (err < 0) |
| return err; |
| err = url_fdopen(s, h); |
| if (err < 0) { |
| url_close(h); |
| return err; |
| } |
| return 0; |
| } |
| |
| int url_fclose(ByteIOContext *s) |
| { |
| URLContext *h = s->opaque; |
| |
| av_free(s->buffer); |
| av_free(s); |
| return url_close(h); |
| } |
| |
| URLContext *url_fileno(ByteIOContext *s) |
| { |
| return s->opaque; |
| } |
| |
| #if CONFIG_MUXERS |
| int url_fprintf(ByteIOContext *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); |
| put_buffer(s, buf, strlen(buf)); |
| return ret; |
| } |
| #endif //CONFIG_MUXERS |
| |
| char *url_fgets(ByteIOContext *s, char *buf, int buf_size) |
| { |
| int c; |
| char *q; |
| |
| c = url_fgetc(s); |
| if (c == EOF) |
| return NULL; |
| q = buf; |
| for(;;) { |
| if (c == EOF || c == '\n') |
| break; |
| if ((q - buf) < buf_size - 1) |
| *q++ = c; |
| c = url_fgetc(s); |
| } |
| if (buf_size > 0) |
| *q = '\0'; |
| return buf; |
| } |
| |
| int url_fget_max_packet_size(ByteIOContext *s) |
| { |
| return s->max_packet_size; |
| } |
| |
| int av_url_read_fpause(ByteIOContext *s, int pause) |
| { |
| if (!s->read_pause) |
| return AVERROR(ENOSYS); |
| return s->read_pause(s->opaque, pause); |
| } |
| |
| int64_t av_url_read_fseek(ByteIOContext *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) { |
| s->buf_ptr = s->buf_end; // Flush buffer |
| s->pos = s->seek(h, 0, SEEK_CUR); |
| } |
| return ret; |
| } |
| |
| /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response |
| * back to the server even if CONFIG_MUXERS is false. */ |
| #if CONFIG_MUXERS || CONFIG_NETWORK |
| /* buffer handling */ |
| int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags) |
| { |
| int ret; |
| *s = av_mallocz(sizeof(ByteIOContext)); |
| if(!*s) |
| return AVERROR(ENOMEM); |
| ret = init_put_byte(*s, buf, buf_size, |
| (flags & URL_WRONLY || flags & URL_RDWR), |
| NULL, NULL, NULL, NULL); |
| if(ret != 0) |
| av_freep(s); |
| return ret; |
| } |
| |
| int url_close_buf(ByteIOContext *s) |
| { |
| put_flush_packet(s); |
| return s->buf_ptr - s->buffer; |
| } |
| |
| /* 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) { |
| d->buffer = av_realloc(d->buffer, new_allocated_size); |
| if(d->buffer == NULL) |
| return AVERROR(ENOMEM); |
| 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(ByteIOContext **s, int max_packet_size) |
| { |
| DynBuffer *d; |
| int ret; |
| 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); |
| *s = av_mallocz(sizeof(ByteIOContext)); |
| if(!*s) { |
| av_free(d); |
| return AVERROR(ENOMEM); |
| } |
| d->io_buffer_size = io_buffer_size; |
| ret = init_put_byte(*s, d->io_buffer, io_buffer_size, |
| 1, d, NULL, |
| max_packet_size ? dyn_packet_buf_write : dyn_buf_write, |
| max_packet_size ? NULL : dyn_buf_seek); |
| if (ret == 0) { |
| (*s)->max_packet_size = max_packet_size; |
| } else { |
| av_free(d); |
| av_freep(s); |
| } |
| return ret; |
| } |
| |
| int url_open_dyn_buf(ByteIOContext **s) |
| { |
| return url_open_dyn_buf_internal(s, 0); |
| } |
| |
| int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size) |
| { |
| if (max_packet_size <= 0) |
| return -1; |
| return url_open_dyn_buf_internal(s, max_packet_size); |
| } |
| |
| int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer) |
| { |
| DynBuffer *d = s->opaque; |
| int size; |
| |
| put_flush_packet(s); |
| |
| *pbuffer = d->buffer; |
| size = d->size; |
| av_free(d); |
| av_free(s); |
| return size; |
| } |
| #endif /* CONFIG_MUXERS || CONFIG_NETWORK */ |