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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /media/ffvpx/libavutil/fifo.c | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'media/ffvpx/libavutil/fifo.c')
-rw-r--r-- | media/ffvpx/libavutil/fifo.c | 510 |
1 files changed, 510 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/fifo.c b/media/ffvpx/libavutil/fifo.c new file mode 100644 index 0000000000..51a5af6f39 --- /dev/null +++ b/media/ffvpx/libavutil/fifo.c @@ -0,0 +1,510 @@ +/* + * a very simple circular buffer FIFO implementation + * Copyright (c) 2000, 2001, 2002 Fabrice Bellard + * Copyright (c) 2006 Roman Shaposhnik + * + * 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 <stdint.h> +#include <string.h> + +#include "avassert.h" +#include "error.h" +#include "fifo.h" +#include "macros.h" +#include "mem.h" + +// by default the FIFO can be auto-grown to 1MB +#define AUTO_GROW_DEFAULT_BYTES (1024 * 1024) + +struct AVFifo { + uint8_t *buffer; + + size_t elem_size, nb_elems; + size_t offset_r, offset_w; + // distinguishes the ambiguous situation offset_r == offset_w + int is_empty; + + unsigned int flags; + size_t auto_grow_limit; +}; + +AVFifo *av_fifo_alloc2(size_t nb_elems, size_t elem_size, + unsigned int flags) +{ + AVFifo *f; + void *buffer = NULL; + + if (!elem_size) + return NULL; + + if (nb_elems) { + buffer = av_realloc_array(NULL, nb_elems, elem_size); + if (!buffer) + return NULL; + } + f = av_mallocz(sizeof(*f)); + if (!f) { + av_free(buffer); + return NULL; + } + f->buffer = buffer; + f->nb_elems = nb_elems; + f->elem_size = elem_size; + f->is_empty = 1; + + f->flags = flags; + f->auto_grow_limit = FFMAX(AUTO_GROW_DEFAULT_BYTES / elem_size, 1); + + return f; +} + +void av_fifo_auto_grow_limit(AVFifo *f, size_t max_elems) +{ + f->auto_grow_limit = max_elems; +} + +size_t av_fifo_elem_size(const AVFifo *f) +{ + return f->elem_size; +} + +size_t av_fifo_can_read(const AVFifo *f) +{ + if (f->offset_w <= f->offset_r && !f->is_empty) + return f->nb_elems - f->offset_r + f->offset_w; + return f->offset_w - f->offset_r; +} + +size_t av_fifo_can_write(const AVFifo *f) +{ + return f->nb_elems - av_fifo_can_read(f); +} + +int av_fifo_grow2(AVFifo *f, size_t inc) +{ + uint8_t *tmp; + + if (inc > SIZE_MAX - f->nb_elems) + return AVERROR(EINVAL); + + tmp = av_realloc_array(f->buffer, f->nb_elems + inc, f->elem_size); + if (!tmp) + return AVERROR(ENOMEM); + f->buffer = tmp; + + // move the data from the beginning of the ring buffer + // to the newly allocated space + if (f->offset_w <= f->offset_r && !f->is_empty) { + const size_t copy = FFMIN(inc, f->offset_w); + memcpy(tmp + f->nb_elems * f->elem_size, tmp, copy * f->elem_size); + if (copy < f->offset_w) { + memmove(tmp, tmp + copy * f->elem_size, + (f->offset_w - copy) * f->elem_size); + f->offset_w -= copy; + } else + f->offset_w = copy == inc ? 0 : f->nb_elems + copy; + } + + f->nb_elems += inc; + + return 0; +} + +static int fifo_check_space(AVFifo *f, size_t to_write) +{ + const size_t can_write = av_fifo_can_write(f); + const size_t need_grow = to_write > can_write ? to_write - can_write : 0; + size_t can_grow; + + if (!need_grow) + return 0; + + can_grow = f->auto_grow_limit > f->nb_elems ? + f->auto_grow_limit - f->nb_elems : 0; + if ((f->flags & AV_FIFO_FLAG_AUTO_GROW) && need_grow <= can_grow) { + // allocate a bit more than necessary, if we can + const size_t inc = (need_grow < can_grow / 2 ) ? need_grow * 2 : can_grow; + return av_fifo_grow2(f, inc); + } + + return AVERROR(ENOSPC); +} + +static int fifo_write_common(AVFifo *f, const uint8_t *buf, size_t *nb_elems, + AVFifoCB read_cb, void *opaque) +{ + size_t to_write = *nb_elems; + size_t offset_w; + int ret = 0; + + ret = fifo_check_space(f, to_write); + if (ret < 0) + return ret; + + offset_w = f->offset_w; + + while (to_write > 0) { + size_t len = FFMIN(f->nb_elems - offset_w, to_write); + uint8_t *wptr = f->buffer + offset_w * f->elem_size; + + if (read_cb) { + ret = read_cb(opaque, wptr, &len); + if (ret < 0 || len == 0) + break; + } else { + memcpy(wptr, buf, len * f->elem_size); + buf += len * f->elem_size; + } + offset_w += len; + if (offset_w >= f->nb_elems) + offset_w = 0; + to_write -= len; + } + f->offset_w = offset_w; + + if (*nb_elems != to_write) + f->is_empty = 0; + *nb_elems -= to_write; + + return ret; +} + +int av_fifo_write(AVFifo *f, const void *buf, size_t nb_elems) +{ + return fifo_write_common(f, buf, &nb_elems, NULL, NULL); +} + +int av_fifo_write_from_cb(AVFifo *f, AVFifoCB read_cb, + void *opaque, size_t *nb_elems) +{ + return fifo_write_common(f, NULL, nb_elems, read_cb, opaque); +} + +static int fifo_peek_common(const AVFifo *f, uint8_t *buf, size_t *nb_elems, + size_t offset, AVFifoCB write_cb, void *opaque) +{ + size_t to_read = *nb_elems; + size_t offset_r = f->offset_r; + size_t can_read = av_fifo_can_read(f); + int ret = 0; + + if (offset > can_read || to_read > can_read - offset) { + *nb_elems = 0; + return AVERROR(EINVAL); + } + + if (offset_r >= f->nb_elems - offset) + offset_r -= f->nb_elems - offset; + else + offset_r += offset; + + while (to_read > 0) { + size_t len = FFMIN(f->nb_elems - offset_r, to_read); + uint8_t *rptr = f->buffer + offset_r * f->elem_size; + + if (write_cb) { + ret = write_cb(opaque, rptr, &len); + if (ret < 0 || len == 0) + break; + } else { + memcpy(buf, rptr, len * f->elem_size); + buf += len * f->elem_size; + } + offset_r += len; + if (offset_r >= f->nb_elems) + offset_r = 0; + to_read -= len; + } + + *nb_elems -= to_read; + + return ret; +} + +int av_fifo_read(AVFifo *f, void *buf, size_t nb_elems) +{ + int ret = fifo_peek_common(f, buf, &nb_elems, 0, NULL, NULL); + av_fifo_drain2(f, nb_elems); + return ret; +} + +int av_fifo_read_to_cb(AVFifo *f, AVFifoCB write_cb, + void *opaque, size_t *nb_elems) +{ + int ret = fifo_peek_common(f, NULL, nb_elems, 0, write_cb, opaque); + av_fifo_drain2(f, *nb_elems); + return ret; +} + +int av_fifo_peek(AVFifo *f, void *buf, size_t nb_elems, size_t offset) +{ + return fifo_peek_common(f, buf, &nb_elems, offset, NULL, NULL); +} + +int av_fifo_peek_to_cb(AVFifo *f, AVFifoCB write_cb, void *opaque, + size_t *nb_elems, size_t offset) +{ + return fifo_peek_common(f, NULL, nb_elems, offset, write_cb, opaque); +} + +void av_fifo_drain2(AVFifo *f, size_t size) +{ + const size_t cur_size = av_fifo_can_read(f); + + av_assert0(cur_size >= size); + if (cur_size == size) + f->is_empty = 1; + + if (f->offset_r >= f->nb_elems - size) + f->offset_r -= f->nb_elems - size; + else + f->offset_r += size; +} + +void av_fifo_reset2(AVFifo *f) +{ + f->offset_r = f->offset_w = 0; + f->is_empty = 1; +} + +void av_fifo_freep2(AVFifo **f) +{ + if (*f) { + av_freep(&(*f)->buffer); + av_freep(f); + } +} + + +#if FF_API_FIFO_OLD_API +FF_DISABLE_DEPRECATION_WARNINGS +#define OLD_FIFO_SIZE_MAX (size_t)FFMIN3(INT_MAX, UINT32_MAX, SIZE_MAX) + +AVFifoBuffer *av_fifo_alloc_array(size_t nmemb, size_t size) +{ + AVFifoBuffer *f; + void *buffer; + + if (nmemb > OLD_FIFO_SIZE_MAX / size) + return NULL; + + buffer = av_realloc_array(NULL, nmemb, size); + if (!buffer) + return NULL; + f = av_mallocz(sizeof(AVFifoBuffer)); + if (!f) { + av_free(buffer); + return NULL; + } + f->buffer = buffer; + f->end = f->buffer + nmemb * size; + av_fifo_reset(f); + return f; +} + +AVFifoBuffer *av_fifo_alloc(unsigned int size) +{ + return av_fifo_alloc_array(size, 1); +} + +void av_fifo_free(AVFifoBuffer *f) +{ + if (f) { + av_freep(&f->buffer); + av_free(f); + } +} + +void av_fifo_freep(AVFifoBuffer **f) +{ + if (f) { + av_fifo_free(*f); + *f = NULL; + } +} + +void av_fifo_reset(AVFifoBuffer *f) +{ + f->wptr = f->rptr = f->buffer; + f->wndx = f->rndx = 0; +} + +int av_fifo_size(const AVFifoBuffer *f) +{ + return (uint32_t)(f->wndx - f->rndx); +} + +int av_fifo_space(const AVFifoBuffer *f) +{ + return f->end - f->buffer - av_fifo_size(f); +} + +int av_fifo_realloc2(AVFifoBuffer *f, unsigned int new_size) +{ + unsigned int old_size = f->end - f->buffer; + + if (new_size > OLD_FIFO_SIZE_MAX) + return AVERROR(EINVAL); + + if (old_size < new_size) { + size_t offset_r = f->rptr - f->buffer; + size_t offset_w = f->wptr - f->buffer; + uint8_t *tmp; + + tmp = av_realloc(f->buffer, new_size); + if (!tmp) + return AVERROR(ENOMEM); + + // move the data from the beginning of the ring buffer + // to the newly allocated space + // the second condition distinguishes full vs empty fifo + if (offset_w <= offset_r && av_fifo_size(f)) { + const size_t copy = FFMIN(new_size - old_size, offset_w); + memcpy(tmp + old_size, tmp, copy); + if (copy < offset_w) { + memmove(tmp, tmp + copy , offset_w - copy); + offset_w -= copy; + } else + offset_w = old_size + copy; + } + + f->buffer = tmp; + f->end = f->buffer + new_size; + f->rptr = f->buffer + offset_r; + f->wptr = f->buffer + offset_w; + } + return 0; +} + +int av_fifo_grow(AVFifoBuffer *f, unsigned int size) +{ + unsigned int old_size = f->end - f->buffer; + if(size + (unsigned)av_fifo_size(f) < size) + return AVERROR(EINVAL); + + size += av_fifo_size(f); + + if (old_size < size) + return av_fifo_realloc2(f, FFMAX(size, 2*old_size)); + return 0; +} + +/* src must NOT be const as it can be a context for func that may need + * updating (like a pointer or byte counter) */ +int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, + int (*func)(void *, void *, int)) +{ + int total = size; + uint32_t wndx= f->wndx; + uint8_t *wptr= f->wptr; + + if (size > av_fifo_space(f)) + return AVERROR(ENOSPC); + + do { + int len = FFMIN(f->end - wptr, size); + if (func) { + len = func(src, wptr, len); + if (len <= 0) + break; + } else { + memcpy(wptr, src, len); + src = (uint8_t *)src + len; + } + wptr += len; + if (wptr >= f->end) + wptr = f->buffer; + wndx += len; + size -= len; + } while (size > 0); + f->wndx= wndx; + f->wptr= wptr; + return total - size; +} + +int av_fifo_generic_peek_at(AVFifoBuffer *f, void *dest, int offset, int buf_size, void (*func)(void*, void*, int)) +{ + uint8_t *rptr = f->rptr; + + if (offset < 0 || buf_size > av_fifo_size(f) - offset) + return AVERROR(EINVAL); + + if (offset >= f->end - rptr) + rptr += offset - (f->end - f->buffer); + else + rptr += offset; + + while (buf_size > 0) { + int len; + + if (rptr >= f->end) + rptr -= f->end - f->buffer; + + len = FFMIN(f->end - rptr, buf_size); + if (func) + func(dest, rptr, len); + else { + memcpy(dest, rptr, len); + dest = (uint8_t *)dest + len; + } + + buf_size -= len; + rptr += len; + } + + return 0; +} + +int av_fifo_generic_peek(AVFifoBuffer *f, void *dest, int buf_size, + void (*func)(void *, void *, int)) +{ + return av_fifo_generic_peek_at(f, dest, 0, buf_size, func); +} + +int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, + void (*func)(void *, void *, int)) +{ + if (buf_size > av_fifo_size(f)) + return AVERROR(EINVAL); + + do { + int len = FFMIN(f->end - f->rptr, buf_size); + if (func) + func(dest, f->rptr, len); + else { + memcpy(dest, f->rptr, len); + dest = (uint8_t *)dest + len; + } + av_fifo_drain(f, len); + buf_size -= len; + } while (buf_size > 0); + return 0; +} + +/** Discard data from the FIFO. */ +void av_fifo_drain(AVFifoBuffer *f, int size) +{ + av_assert2(av_fifo_size(f) >= size); + f->rptr += size; + if (f->rptr >= f->end) + f->rptr -= f->end - f->buffer; + f->rndx += size; +} +FF_ENABLE_DEPRECATION_WARNINGS +#endif |