Initial commit: TXW82x FPV v2.7.0.7-42229 SDK + project sources

sdk/lib/multimedia/msi/framebuff.c

@@ -0,0 +1,148 @@
+#include "basic_include.h"
+#include "lib/multimedia/msi.h"
+
+static void fb_free(struct framebuff *fb)
+{
+    int32 ret = 0;
+    struct msi *msi;
+
+    if (fb) {
+        ASSERT(atomic_read(&fb->users) > 0);
+        if (!atomic_dec_and_test(&fb->users)) {
+            return;
+        }
+
+        msi = fb->msi;
+        ret = msi_do_cmd(fb->msi, MSI_CMD_FREE_FB, (uint32)fb, 0);
+        msi_put(msi);
+        if (ret == RET_OK) { //不等于OK表示模块自己管理fb，例如预分配的fb
+            ASSERT(!fb->pool); //预分配的framebuff不能执行到这里
+            FB_FREE(fb);
+        }
+    }
+}
+
+//framebuff 引用计数加1
+void fb_get(struct framebuff *fb)
+{
+    if (fb) {
+        fb_get(fb->next);
+        atomic_inc(&fb->users);
+    }
+}
+
+struct framebuff *fb_alloc(uint8 *data, int32 size, uint16 type, struct msi *msi)
+{
+    int32 len = data ? 0 : size;
+    struct framebuff *fb = FB_ALLOC(sizeof(struct framebuff) + len);
+    if (fb) {
+        os_memset(fb, 0, sizeof(struct framebuff));
+        atomic_set(&fb->users, 1);
+        fb->len  = size;
+        fb->msi  = msi;
+        fb->mtype = (type >> 8) & 0xff;
+        fb->stype = type & 0xff;
+        msi_get(fb->msi);
+        if (data) {
+            fb->data = data;
+        } else if (size) {
+            fb->data = (uint8 *)(fb + 1);
+        }
+    }
+    return fb;
+}
+
+struct framebuff *fb_clone(struct framebuff *fb, uint16 type, struct msi *msi)
+{
+    struct framebuff *fb_n = FB_ALLOC(sizeof(struct framebuff));
+    if (fb_n) {
+        os_memset(fb_n, 0, sizeof(struct framebuff));
+        atomic_set(&fb_n->users, 1);
+        fb_n->clone = 1;
+        fb_n->msi  = msi;
+        fb_n->mtype = (type >> 8) & 0xff;
+        fb_n->stype = type & 0xff;
+        msi_get(fb_n->msi);
+        fb_n->data = fb->data;
+        fb_n->len  = fb->len;
+        fb_n->time = fb->time;
+        fb_n->priv = fb->priv;
+        fb_n->srcID = fb->srcID;
+        fb_n->datatag = fb->datatag;
+        fb_get(fb);
+        fb_n->next = fb;
+    }
+    return fb_n;
+}
+
+//framebuff 引用计数减1，当计数减至0时会释放空间
+void fb_put(struct framebuff *fb)
+{
+    if (fb) {
+        fb_put(fb->next);
+        fb_free(fb);
+    }
+}
+
+//使用新的framebuff引用关联另1个framebuff，fb_old引用计数加1
+void fb_ref(struct framebuff *fb_new, struct framebuff *fb_old)
+{
+    ASSERT(fb_new->next == NULL);
+    fb_get(fb_old);
+    fb_new->next = fb_old;
+}
+
+//获取framebuff链表中指定type的数据的第1个节点
+struct framebuff *fb_find(struct framebuff *fb, uint8 mtype, uint8 stype)
+{
+    if (mtype == 0 || fb == NULL || fb->next == NULL) {
+        return fb;
+    }
+
+    while (fb) {
+        if (fb->mtype == mtype && (fb->stype == stype || stype == 0)) {
+            return fb;
+        }
+        fb = fb->next;
+    }
+    return NULL;
+}
+
+//获取framebuff链表中指定type的数据的总长度
+uint32 fb_len(struct framebuff *fb,  uint8 mtype, uint8 stype)
+{
+    uint32 len = 0;
+
+    if (mtype == 0 || fb == NULL) {
+        return fb ? fb->len : 0;
+    }
+
+    if (fb->mtype != mtype) {
+        return 0;
+    }
+
+    while (fb) {
+        if (fb->mtype == mtype && (fb->stype == stype || stype == 0)) {
+            len += fb->len;
+        }
+        fb = fb->next;
+    }
+    return len;
+}
+
+//根据fb->mtype 识别fb携带的数据为 视频，音频，图片，字幕
+MEDIA_DATA_CATEGORY fb_category(struct framebuff *fb)
+{
+    if (fb->mtype < 32) {        //video
+        return MEDIA_DATA_VIDEO;
+    } else if (fb->mtype < 64) { //audio
+        return MEDIA_DATA_AUDIO;
+    } else if (fb->mtype < 96) { //picture
+        return MEDIA_DATA_PICTURE;
+    } else if (fb->mtype < 128) { //text
+        return MEDIA_DATA_TEXT;
+    } else {
+        return MEDIA_DATA_MAX;
+    }
+}
+