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🎥 Command line media player
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#include "config.h"
#include <stddef.h>#include <stdbool.h>#include <pthread.h>#include <assert.h>
#include <libavutil/buffer.h>#include <libavutil/hwcontext.h>#include <libavutil/mem.h>
#include "mpv_talloc.h"
#include "common/common.h"
#include "fmt-conversion.h"#include "mp_image.h"#include "mp_image_pool.h"
static pthread_mutex_t pool_mutex = PTHREAD_MUTEX_INITIALIZER;#define pool_lock() pthread_mutex_lock(&pool_mutex)#define pool_unlock() pthread_mutex_unlock(&pool_mutex)
// Thread-safety: the pool itself is not thread-safe, but pool-allocated images// can be referenced and unreferenced from other threads. (As long as the image// destructors are thread-safe.)
struct mp_image_pool { int max_count;
struct mp_image **images; int num_images;
mp_image_allocator allocator; void *allocator_ctx;
bool use_lru; unsigned int lru_counter;};
// Used to gracefully handle the case when the pool is freed while image// references allocated from the image pool are still held by someone.struct image_flags { // If both of these are false, the image must be freed. bool referenced; // outside mp_image reference exists bool pool_alive; // the mp_image_pool references this unsigned int order; // for LRU allocation (basically a timestamp)};
static void image_pool_destructor(void *ptr){ struct mp_image_pool *pool = ptr; mp_image_pool_clear(pool);}
struct mp_image_pool *mp_image_pool_new(int max_count){ struct mp_image_pool *pool = talloc_ptrtype(NULL, pool); talloc_set_destructor(pool, image_pool_destructor); *pool = (struct mp_image_pool) { .max_count = max_count, }; return pool;}
void mp_image_pool_clear(struct mp_image_pool *pool){ for (int n = 0; n < pool->num_images; n++) { struct mp_image *img = pool->images[n]; struct image_flags *it = img->priv; bool referenced; pool_lock(); assert(it->pool_alive); it->pool_alive = false; referenced = it->referenced; pool_unlock(); if (!referenced) talloc_free(img); } pool->num_images = 0;}
// This is the only function that is allowed to run in a different thread.// (Consider passing an image to another thread, which frees it.)static void unref_image(void *opaque, uint8_t *data){ struct mp_image *img = opaque; struct image_flags *it = img->priv; bool alive; pool_lock(); assert(it->referenced); it->referenced = false; alive = it->pool_alive; pool_unlock(); if (!alive) talloc_free(img);}
// Return a new image of given format/size. Unlike mp_image_pool_get(), this// returns NULL if there is no free image of this format/size.struct mp_image *mp_image_pool_get_no_alloc(struct mp_image_pool *pool, int fmt, int w, int h){ struct mp_image *new = NULL; pool_lock(); for (int n = 0; n < pool->num_images; n++) { struct mp_image *img = pool->images[n]; struct image_flags *img_it = img->priv; assert(img_it->pool_alive); if (!img_it->referenced) { if (img->imgfmt == fmt && img->w == w && img->h == h) { if (pool->use_lru) { struct image_flags *new_it = new ? new->priv : NULL; if (!new_it || new_it->order > img_it->order) new = img; } else { new = img; break; } } } } pool_unlock(); if (!new) return NULL;
// Reference the new image. Since mp_image_pool is not declared thread-safe, // and unreffing images from other threads does not allocate new images, // no synchronization is required here. for (int p = 0; p < MP_MAX_PLANES; p++) assert(!!new->bufs[p] == !p); // only 1 AVBufferRef
struct mp_image *ref = mp_image_new_dummy_ref(new);
// This assumes the buffer is at this point exclusively owned by us: we // can't track whether the buffer is unique otherwise. // (av_buffer_is_writable() checks the refcount of the new buffer only.) int flags = av_buffer_is_writable(new->bufs[0]) ? 0 : AV_BUFFER_FLAG_READONLY; ref->bufs[0] = av_buffer_create(new->bufs[0]->data, new->bufs[0]->size, unref_image, new, flags); if (!ref->bufs[0]) { talloc_free(ref); return NULL; }
struct image_flags *it = new->priv; assert(!it->referenced && it->pool_alive); it->referenced = true; it->order = ++pool->lru_counter; return ref;}
void mp_image_pool_add(struct mp_image_pool *pool, struct mp_image *new){ struct image_flags *it = talloc_ptrtype(new, it); *it = (struct image_flags) { .pool_alive = true }; new->priv = it; MP_TARRAY_APPEND(pool, pool->images, pool->num_images, new);}
// Return a new image of given format/size. The only difference to// mp_image_alloc() is that there is a transparent mechanism to recycle image// data allocations through this pool.// If pool==NULL, mp_image_alloc() is called (for convenience).// The image can be free'd with talloc_free().// Returns NULL on OOM.struct mp_image *mp_image_pool_get(struct mp_image_pool *pool, int fmt, int w, int h){ if (!pool) return mp_image_alloc(fmt, w, h); struct mp_image *new = mp_image_pool_get_no_alloc(pool, fmt, w, h); if (!new) { if (pool->num_images >= pool->max_count) mp_image_pool_clear(pool); if (pool->allocator) { new = pool->allocator(pool->allocator_ctx, fmt, w, h); } else { new = mp_image_alloc(fmt, w, h); } if (!new) return NULL; mp_image_pool_add(pool, new); new = mp_image_pool_get_no_alloc(pool, fmt, w, h); } return new;}
// Like mp_image_new_copy(), but allocate the image out of the pool.// If pool==NULL, a plain copy is made (for convenience).// Returns NULL on OOM.struct mp_image *mp_image_pool_new_copy(struct mp_image_pool *pool, struct mp_image *img){ struct mp_image *new = mp_image_pool_get(pool, img->imgfmt, img->w, img->h); if (new) { mp_image_copy(new, img); mp_image_copy_attributes(new, img); } return new;}
// Like mp_image_make_writeable(), but if a copy has to be made, allocate it// out of the pool.// If pool==NULL, mp_image_make_writeable() is called (for convenience).// Returns false on failure (see mp_image_make_writeable()).bool mp_image_pool_make_writeable(struct mp_image_pool *pool, struct mp_image *img){ if (mp_image_is_writeable(img)) return true; struct mp_image *new = mp_image_pool_new_copy(pool, img); if (!new) return false; mp_image_steal_data(img, new); assert(mp_image_is_writeable(img)); return true;}
// Call cb(cb_data, fmt, w, h) to allocate an image. Note that the resulting// image must use only 1 AVBufferRef. The returned image must also be owned// exclusively by the image pool, otherwise mp_image_is_writeable() will not// work due to FFmpeg restrictions.void mp_image_pool_set_allocator(struct mp_image_pool *pool, mp_image_allocator cb, void *cb_data){ pool->allocator = cb; pool->allocator_ctx = cb_data;}
// Put into LRU mode. (Likely better for hwaccel surfaces, but worse for memory.)void mp_image_pool_set_lru(struct mp_image_pool *pool){ pool->use_lru = true;}
// Copies the contents of the HW surface img to system memory and retuns it.// If swpool is not NULL, it's used to allocate the target image.// img must be a hw surface with a AVHWFramesContext attached.// The returned image is cropped as needed.// Returns NULL on failure.struct mp_image *mp_image_hw_download(struct mp_image *src, struct mp_image_pool *swpool){ if (!src->hwctx) return NULL; AVHWFramesContext *fctx = (void *)src->hwctx->data;
// Try to find the first format which we can apparently use. int imgfmt = 0; enum AVPixelFormat *fmts; if (av_hwframe_transfer_get_formats(src->hwctx, AV_HWFRAME_TRANSFER_DIRECTION_FROM, &fmts, 0) < 0) return NULL; for (int n = 0; fmts[n] != AV_PIX_FMT_NONE; n++) { imgfmt = pixfmt2imgfmt(fmts[n]); if (imgfmt) break; } av_free(fmts);
if (!imgfmt) return NULL;
struct mp_image *dst = mp_image_pool_get(swpool, imgfmt, fctx->width, fctx->height); if (!dst) return NULL;
// Target image must be writable, so unref it. AVFrame *dstav = mp_image_to_av_frame_and_unref(dst); if (!dstav) return NULL;
AVFrame *srcav = mp_image_to_av_frame(src); if (!srcav) { av_frame_unref(dstav); return NULL; }
int res = av_hwframe_transfer_data(dstav, srcav, 0); av_frame_free(&srcav); dst = mp_image_from_av_frame(dstav); av_frame_free(&dstav); if (res >= 0 && dst) { mp_image_set_size(dst, src->w, src->h); mp_image_copy_attributes(dst, src); } else { mp_image_unrefp(&dst); } return dst;}
bool mp_image_hw_upload(struct mp_image *hw_img, struct mp_image *src){ if (hw_img->w != src->w || hw_img->h != src->h) return false;
if (!hw_img->hwctx || src->hwctx) return false;
bool ok = false; AVFrame *dstav = NULL; AVFrame *srcav = NULL;
// This means the destination image will not be "writable", which would be // a pain if Libav enforced this - fortunately it doesn't care. We can // transfer data to it even if there are multiple refs. dstav = mp_image_to_av_frame(hw_img); if (!dstav) goto done;
srcav = mp_image_to_av_frame(src); if (!srcav) goto done;
ok = av_hwframe_transfer_data(dstav, srcav, 0) >= 0;
done: av_frame_unref(srcav); av_frame_unref(dstav);
if (ok) mp_image_copy_attributes(hw_img, src); return ok;}